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ELECTRONIC CODE OF FEDERAL REGULATIONS
e-CFR Data is current as of February 13, 2013
Title 36: Parks, Forests, and Public Property
PART 7—SPECIAL REGULATIONS, AREAS OF THE NATIONAL PARK SYSTEM
§ 7.13 Yellowstone National Park.
(a) Commercial Vehicles. (1) Notwithstanding the prohibition of commercial vehicles set forth in
§ 5.6 of this chapter, commercial vehicles are allowed to operate on U.S. Highway 191 in accordance
with the provisions of this section.
(2) The transporting on U.S. Highway 191 of any substance or combination of substances,
including any hazardous substance, hazardous material, or hazardous waste as defined in 49 CFR
171.8 that requires placarding of the transport vehicle in accordance with 49 CFR 177.823 or any
marine pollutant that requires marking as defined in 49 CFR Subtitle B, is prohibited; provided,
however, that the superintendent may issue permits and establish terms and conditions for the
transportation of hazardous materials on U.S. Highway 191 in emergencies or when such
transportation is necessary for access to lands within or adjacent to the park area.
(3) The operator of a motor vehicle transporting any hazardous substance, hazardous material,
hazardous waste, or marine pollutant in accordance with a permit issued under this section is not
relieved in any manner from complying with all applicable regulations in 49 CFR Subtitle B, or with any
other State or federal laws and regulations applicable to the transportation of any hazardous
substance, hazardous material, hazardous waste, or marine pollutant.
(4) The superintendent may require a permit and establish terms and conditions for the operation
of a commercial vehicle on any park road in accordance with § 1.6 of this chapter. The superintendent
may charge a fee for permits in accordance with a fee schedule established annually.
(5) Operating without, or violating a term or condition of, a permit issued in accordance with this
section is prohibited. In addition, violating a term or condition of a permit may result in the suspension
or revocation of the permit.
(b) Employee motor vehicle permits:
(1) A motor vehicle owned and/or operated by an employee of the U.S. Government, park
concessioners and contractors, whether employed in a permanent or temporary capacity, shall be
registered with the Superintendent and a permit authorizing the use of said vehicle in the park is
required. This requirement also applies to members of an employee's family living in the park who own
or operate a motor vehicle within the park. Such permit, issued free of charge, may be secured only
when the vehicle operator can produce a valid certificate of registration, and has in his possession a
valid operator's license. No motor vehicle may be operated on park roads unless properly registered.
(2) The permit is valid only for the calendar year of issue. Registry must be completed and permits
secured by April 15 of each year or within one week after bringing a motor vehicle into the park,
whichever date is later. The permit shall be affixed to the vehicle as designated by the Superintendent.
(c) [Reserved]
(d) Vessels —(1) Permit. (i) A general permit, issued by the Superintendent, is required for all
vessels operated upon the waters of the park open to boating. In certain areas a special permit is

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required as specified hereinbelow. These permits must be carried within the vessel at all times when
any person is aboard, and shall be exhibited upon request to any person authorized to enforce the
regulations in this chapter.
(ii) A special permit shall be issued by the Superintendent to any holder of a general permit who
expresses the intention to travel into either the South Arm or the Southeast Arm “Five Mile Per Hour
Zones” of Yellowstone Lake, as defined in paragraphs (d)(6) (ii) and (iii) of this section, upon the
completion and filing of a form statement in accordance with the provisions of paragraph (d)(10) of this
section.
(iii) Neither a general nor special permit shall be issued until the permittee has signed a statement
certifying that he is familiar with the speed and all other limitations and requirements in these
regulations. The applicant for a special permit shall also agree in writing to provide, in accordance with
paragraph (d)(10) of this section, information concerning the actual travel within the “Five Mile Per
Hour Zones.”
(2) Removal of vessels. All privately owned vessels, boat trailers, waterborne craft of any kind,
buoys, mooring floats, and anchorage equipment will not be permitted in the park prior to May 1 and
must be removed by November 1.
(3) Restricted landing areas. (i) Prior to July 1 of each year, the landing of any vessel on the shore
of Yellowstone Lake between Trail Creek and Beaverdam Creek is prohibited, except upon written
permission of the Superintendent.
(ii) The landing or beaching of any vessel on the shores of Yellowstone Lake ( a ) within the
confines of Bridge Bay Marina and Lagoon and the connecting channel with Yellowstone Lake; and
( b ) within the confines of Grant Village Marina and Lagoon and the connecting channel with
Yellowstone Lake is prohibited except at the piers or docks provided for the purpose.
(4) Closed waters. (i) Vessels are prohibited on Sylvan Lake, Eleanor Lake, Twin Lakes, and
Beach Springs Lagoon.
(ii) Vessels are prohibited on park rivers and streams (as differentiated from lakes and lagoons),
except on the channel between Lewis Lake and Shoshone Lake, which is open only to handpropelled
vessels.
(5) Lewis Lake motorboat waters. Motorboats are permitted on Lewis Lake.
(6) Yellowstone Lake motorboat waters. Motorboats are permitted on Yellowstone Lake except in
Flat Mountain Arm as described in paragraph (d)(6)(i) of this section and as restricted within the South
Arm and the Southeast Arm where operation is confined to areas known as “Five Mile Per Hour
Zones” which waters are between the lines as described in paragraphs (d)(6) (ii) and (iii) of this section
in the South Arm and Southeast Arm, but which specifically exclude the southernmost 2 miles of both
Arms which are open only to hand-propelled vessels.
(i) The following portion of Flat Mountain Arm of Yellowstone Lake is restricted to hand-propelled
vessels: West of a line beginning at a point marked by a monument located on the south shore of the
Flat Mountain Arm and approximately 10,200 feet easterly from the southwest tip of the said arm, said
point being approximately 44°22′13.2″ N. latitude and 110°25′07.2″ W. longitude, then running
approximately 2,800 feet due north to a point marked by a monument located on the north shore of the
Flat Mountain Arm, said point being approximately 44°22′40″ N. latitude and 110°25′07.2″ W.
longitude.
(ii) In the South Arm that portion between a line from Plover Point running generally east to a point
marked by a monument on the northwest tip of the peninsula common to the South and Southeast
Arms; and a line from a monument located on the west shore of the South Arm approximately 2 miles
north of the cairn which marks the extreme southern extremity of Yellowstone Lake in accordance with
the Act of Congress establishing Yellowstone National Park; said point being approximately in latitude
44°18′22.8″ N., at longitude 110°20′04.8″ W., Greenwich Meridian, running due east to a point on the

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east shore of the South Arm marked by a monument. Operation of motorboats south of the latter line
is prohibited.
(iii) In the Southeast Arm that portion between a line from a monument on the northwest tip of the
peninsula common to the South and Southeast Arms which runs generally east to a monument at the
mouth of Columbine Creek; and a line from a cairn which marks the extreme eastern extremity of
Yellowstone Lake, in accordance with the Act of Congress establishing Yellowstone National Park;
said point being approximately in latitude 44°19′42.0″ N., at longitude 110°12′06.0″ W., Greenwich
Meridian, running westerly to a point on the west shore of the Southeast Arm, marked by a monument;
said point being approximately in latitude 44°20′03.6″ N., at longitude 110°16′19.2″ W., Greenwich
Meridian. Operation of motorboats south of the latter line is prohibited.
(7) Motorboats are prohibited on park waters except as permitted in paragraphs (d) (5) and (6) of
this section.
(8) Hand-propelled vessel waters. Hand-propelled vessels and sail vessels may operate in park
waters except on those waters named in paragraph (d)(4) of this section.
(9) Five Mile Per Hour Zone motorboat restrictions. The operation of motorboats within “Five Mile
Per Hour Zones” is subject to the following restrictions:
(i) Class 1 and Class 2 motorboats shall proceed no closer than one-quarter mile from the
shoreline except to debark or embark passengers, or while moored when passengers are ashore.
(ii) [Reserved]
(10) Permission required to operate motorboats in Five Mile Per Hour Zone. Written authority for
motorboats to enter either or both the South Arm or the Southeast Arm “Five Mile Per Hour Zones”
shall be granted to an operator providing that prior to commencement of such entry the operator
completes and files with the Superintendent a form statement showing:
(i) Length, make, and number of motorboat.
(ii) Type of vessel, such as inboard, inboard-outboard, turbojet, and including make and
horsepower rating of motor.
(iii) Name and address of head of party.
(iv) Number of persons in party.
(v) Number of nights planned to spend in each “Five Mile Per Hour Zone.”
(vi) Place where camping is planned within each “Five Mile Per Hour Zone,” or if applicable,
whether party will remain overnight on board.
(11) The disturbance of birds inhabiting or nesting on either of the islands designated as “Molly
Islands” in the Southeast Arm of Yellowstone Lake is prohibited; nor shall any vessel approach the
shoreline of said islands within one-quarter mile.
(12) Boat racing, water pageants, and spectacular or unsafe types of recreational use of vessels
are prohibited on park waters.
(e) Fishing. (1) Fishing restrictions, based on management objectives described in the park's
Resources Management Plan, are established annually by the superintendent.
(2) The superintendent may impose closures and establish conditions or restrictions, in
accordance with the criteria and procedures of §§ 1.5 and 1.7 of this chapter, on any activity pertaining
to fishing, including, but not limited to, seasons and hours during which fishing may take place, size,
creel and possession limits, species of fish that may be taken and methods of taking.

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(3) Closed waters. The following waters of the park are closed to fishing and are so designated by
appropriate signs:
(i) Pelican Creek from its mouth to a point two miles upstream.
(ii) The Yellowstone River and its tributary streams from the Yellowstone Lake outlet to a point
one mile downstream.
(iii) The Yellowstone River and its tributary streams from the confluence of Alum Creek with the
Yellowstone River upstream to the Sulphur Caldron.
(iv) The Yellowstone River from the top of the Upper Falls downstream to a point directly below
the overlook known as Inspiration Point.
(v) Bridge Bay Lagoon and Marina and Grant Village Lagoon and Marina and their connecting
channels with Yellowstone Lake.
(vi) The shores of the southern extreme of the West Thumb thermal area along the shore of
Yellowstone Lake to the mouth of Little Thumb Creek.
(vii) The Mammoth water supply reservoir.
(4) Fishing in closed waters or violating a condition or restriction established by the
superintendent is prohibited.
(f) Commercial passenger-carrying vehicles. The prohibition against the commercial transportation
of passengers by motor vehicles in Yellowstone National Park contained in § 5.4 of this chapter shall
be subject to the following exception: Motor vehicles operated on an infrequent and nonscheduled tour
on which the visit to the park is an incident to such tour, carrying only round trip passengers traveling
from the point of origin of the tour will, subject to the conditions set forth in this paragraph, be accorded
admission to the park for the purpose of delivering passengers to a point of overnight stay in the park
and exit from the park. After passengers have completed their stay, such motor vehicles shall leave
the park by the most convenient exit station, considering their destinations. Motor vehicles admitted to
the park under this paragraph shall not, while in the park, engage in general sightseeing operations.
Admission will be accorded such vehicles upon establishing to the satisfaction of the superintendent
that the tour originated from such place and in such manner as not to provide in effect a regular and
duplicating service conflicting with, or in competition with, the services provided for the public pursuant
to contract authorization from the Secretary. The superintendent shall have the authority to specify the
route to be followed by such vehicles within the park.
(g) Camping. (1) Camping in Yellowstone National Park by any person, party, or organization
during any calendar year during the period Labor Day through June 30, inclusive, shall not exceed 30
days, either in a single period or combined separate periods, when such limitations are posted.
(2) The intensive public-use season for camping shall be the period July 1 to Labor Day. During
this period camping by any person, party, or organization shall be limited to a total of 14 days either in
a single period or combined separate periods.
(h) Dogs and cats. Dogs and cats on leash, crated, or otherwise under physical restraint are
permitted in the park only within 100 feet of established roads and parking areas. Dogs and cats are
prohibited on established trails and boardwalks.
(i) [Reserved]
(j) Travel on trails. Foot travel in all thermal areas and within the Yellowstone Canyon between the
Upper Falls and Inspiration Point must be confined to boardwalks or trails that are maintained for such
travel and are marked by official signs.
(k) Portable engines and motors. The operation of motor-driven chain saws, portable motor-driven
electric light plants, portable motor-driven pumps, and other implements driven by portable engines

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and motors is prohibited in the park, except in Mammoth, Canyon, Fishing Bridge, Bridge Bay, Grant
Village, and Madison Campgrounds, for park operation purposes, and for construction and
maintenance projects authorized by the Superintendent. This restriction shall not apply to outboard
motors on waters open to motorboating.
(l)(1) What is the scope of this regulation? The regulations contained in paragraphs (l)(2) through
(l)(17) of this section apply to the use of snowcoaches and recreational snowmobiles. Except where
indicated, paragraphs (l)(2) through (l)(17) do not apply to non-administrative oversnow vehicle use by
NPS, contractor, or concessioner employees, or other non-recreational users authorized by the
Superintendent.
(2) What terms do I need to know ? The definitions in this paragraph (l)(2) also apply to nonadministrative oversnow vehicle use by NPS, contractor, or concessioner employees, and other nonrecreational users authorized by the Superintendent.
Commercial guide means a guide who operates a snowmobile or snowcoach for a fee or
compensation and is authorized to operate in the park under a concession contract. In this section,
“guide” also means “commercial guide.”
Historic snowcoach means a Bombardier snowcoach manufactured in 1983 or earlier. Any other
snowcoach is considered a non-historic snowcoach.
Oversnow route means that portion of the unplowed roadway located between the road shoulders
and designated by snow poles or other poles, ropes, fencing, or signs erected to regulate oversnow
activity. Oversnow routes include pullouts or parking areas that are groomed or marked similarly to
roadways and are adjacent to designated oversnow routes. An oversnow route may also be
distinguished by the interior boundaries of the berm created by the packing and grooming of the
unplowed roadway. The only motorized vehicles permitted on oversnow routes are oversnow vehicles.
Oversnow vehicle means a snowmobile, snowcoach, or other motorized vehicle that is intended
for travel primarily on snow and has been authorized by the Superintendent to operate in the park. An
oversnow vehicle that does not meet the definition of a snowcoach must comply with all requirements
applicable to snowmobiles.
Snowcoach means a self-propelled mass transit vehicle intended for travel on snow, having a
curb weight of over 1,000 pounds (450 kilograms), driven by a track or tracks and steered by skis or
tracks, and having a capacity of at least 8 passengers. A snowcoach has a maximum size of 102
inches wide, plus tracks (not to exceed 110 inches overall); a maximum length of 35 feet; and a Gross
Vehicle Weight Rating (GVWR) not exceeding 25,000 pounds.
Snowmobile means a self-propelled vehicle intended for travel on snow, with a curb weight of not
more than 1,000 pounds (450 kg), driven by a track or tracks in contact with the snow, and which may
be steered by a ski or skis in contact with the snow.
Snowplane means a self-propelled vehicle intended for oversnow travel and driven by an airdisplacing propeller.
(3) May I operate a snowmobile in Yellowstone National Park? (i) You may operate a snowmobile
in Yellowstone National Park in compliance with use limits, guiding requirements, operating hours and
dates, equipment, and operating conditions established under this section. The Superintendent may
establish additional operating conditions and must provide notice of those conditions in accordance
with § 1.7(a) of this chapter or in the FEDERAL REGISTER.
(ii) The authority to operate a snowmobile in Yellowstone National Park established in paragraph
(l)(3)(i) of this section is in effect only through the winter season of 2012-2013.
(4) May I operate a snowcoach in Yellowstone National Park ? (i) Snowcoaches may only be
operated in Yellowstone National Park under a concessions contract. Snowcoach operation is subject
to the conditions stated in the concessions contract and all other conditions identified in this section.

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(ii) All non-historic snowcoaches must meet NPS air emissions requirements, which mean the
applicable EPA emissions standards for the vehicle that were in effect at the time it was manufactured.
(iii) All critical emission-related exhaust components (as listed in 40 CFR 86.004-25(b)(3)(iii)
through (v)) must be functioning properly. Such critical emissions-related components may only be
replaced with the original equipment manufacturer (OEM) component, where possible. Where OEM
parts are not available, aftermarket parts may be used if they are certified not to worsen emission and
sound characteristics.
(iv) Modifying or disabling a snowcoach's original pollution control equipment is prohibited except
for maintenance purposes.
(v) Individual snowcoaches may be subject to periodic inspections to determine compliance with
the requirements of paragraphs (l)(4)(ii) through (l)(4)(iv) of this section.
(vi) The authority to operate a snowcoach in Yellowstone National Park established in paragraph
(l)(4)(i) of this section is in effect only through the winter season of 2012-2013.
(5) Must I operate a certain model of snowmobile? Only commercially available snowmobiles that
meet NPS air and sound emissions requirements as set forth in this section may be operated in the
park. The Superintendent will approve snowmobile makes, models, and years of manufacture that
meet those requirements. Any snowmobile model not approved by the Superintendent may not be
operated in the park.
(6) How will the Superintendent approve snowmobile makes, models, and years of manufacture
for use in the park? (i) Beginning with the 2005 model year, all snowmobiles must be certified under 40
CFR part 1051, to a Family Emission Limit no greater than 15 g/kW-hr for hydrocarbons and to a
Family Emission Limit no greater than 120 g/kW-hr for carbon monoxide.
(A) 2004 model year snowmobiles may use measured emissions levels (official emission results
with no deterioration factors applied) to comply with the emission limits specified in paragraph (l)(6)(i)
of this section.
(B) The snowmobile test procedures specified by EPA (40 CFR parts 1051 and 1065) must be
used to measure air emissions from model year 2004 and later snowmobiles.
(ii) For sound emissions, snowmobiles must operate at or below 73 dBA as measured at full
throttle according to Society of Automotive Engineers J192 test procedures (revised 1985).
Snowmobiles may be tested at any barometric pressure equal to or above 23.4 inches Hg
uncorrected. The Superintendent may revise these testing procedures based on new information
and/or updates to the SAE J192 testing procedures.
(iii) Snowmobiles meeting the requirements for air and sound emissions may be operated in the
park for a period not exceeding 6 years from the date upon which first certified.
(iv) The Superintendent may prohibit entry into the park of any snowmobile that has been
modified in a manner that may adversely affect air or sound emissions.
(v) These air and sound emissions requirements do not apply to snowmobiles being operated on
the Cave Falls Road in Yellowstone.
(7) Where may I operate my snowmobile in Yellowstone National Park? (i) You may operate your
snowmobile only upon designated oversnow routes established within the park in accordance with
§ 2.18(c) of this chapter. The following oversnow routes are designated for snowmobile use through
the winter of 2012-2013:
(A) The Grand Loop Road from its junction with Upper Terrace Drive to Norris Junction.
(B) Norris Junction to Canyon Junction.

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(C) The Grand Loop Road from Norris Junction to Madison Junction.
(D) The West Entrance Road from the park boundary at West Yellowstone to Madison Junction.
(E) The Grand Loop Road from Madison Junction to West Thumb.
(F) The South Entrance Road from the South Entrance to West Thumb.
(G) The Grand Loop Road from West Thumb to its junction with the East Entrance Road.
(H) The East Entrance Road from Fishing Bridge Junction to the East Entrance.
(I) The Grand Loop Road from its junction with the East Entrance Road to Canyon Junction.
(J) The South Canyon Rim Drive.
(K) Lake Butte Road.
(L) In the developed areas of Madison Junction, Old Faithful, Grant Village, West Thumb, Lake,
Fishing Bridge, Canyon, Indian Creek, and Norris.
(M) Firehole Canyon Drive, between noon and 9 p.m. each day.
(N) North Canyon Rim Drive, between noon and 9 p.m. each day.
(O) Riverside Drive, between noon and 9 p.m. each day.
(P) Cave Falls Road.
(ii) The Superintendent may open or close these routes, or portions thereof, for snowmobile travel
after taking into consideration the location of wintering wildlife, appropriate snow cover, public safety,
avalanche conditions, and other factors. Notice of such opening or closing will be provided by one or
more of the methods listed in § 1.7(a) of this chapter.
(iii) This paragraph (l)(7) also applies to non-administrative over-snow vehicle use by NPS,
contractor, or concessioner employees, or other non-recreational users authorized by the
Superintendent.
(iv) Maps detailing the designated oversnow routes will be available from Park Headquarters.
(8) What routes are designated for snowcoach use ? (i) Authorized snowcoaches may be
operated on the routes designated for snowmobile use in paragraphs (l)(7)(i)(A) through (l)(7)(i)(O) of
this section. The restricted hours of snowmobile use described in paragraphs (1)(7)(i)(M) through (1)
(7)(i)(O) do not apply to snowcoaches. Snowcoaches may also be operated on the following additional
oversnow routes through the winter of 2012-2013:
(A) Fountain Flat Road.
(B) The Grand Loop Road from Canyon Junction to Washburn Hot Springs overlook.
(C) For rubber-tracked snowcoaches only, the Grand Loop Road from Upper Terrace Drive to the
junction of the Grand Loop Road and North Entrance Road, and within the Mammoth Hot Springs
developed area.
(ii) The Superintendent may open or close these oversnow routes, or portions thereof, or
designate new routes for snowcoach travel after taking into consideration the location of wintering
wildlife, appropriate snow cover, public safety, and other factors. Notice of such opening or closing
shall be provided by one of more of the methods listed in § 1.7(a) of this chapter.

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(iii) This paragraph (l)(8) also applies to non-administrative snowcoach use by NPS, contractor, or
concessioner employees, and other non-recreational users authorized by the Superintendent.
(9) Must I travel with a commercial guide while snowmobiling in Yellowstone and what other
guiding requirements apply? (i) All recreational snowmobile operators must be accompanied by a
commercial guide.
(ii) Snowmobile parties must travel in a group of no more than 11 snowmobiles, including that of
the guide.
(iii) Guided parties must travel together within a maximum of one-third mile of the first snowmobile
in the group.
(iv) The guiding requirements described in this paragraph (l)(9) do not apply to snowmobiles being
operated on the Cave Falls Road.
(10) Are there limits established for the number of snowmobiles and snowcoaches permitted to
operate in the park each day ? The number of snowmobiles and snowcoaches allowed to operate in
the park each day is limited to a certain number per entrance or location. The limits are listed in the
following table:

Park entrance/location
(i) North Entrance *
(ii) West Entrance
(iii) South Entrance
(iv) East Entrance
(v) Old Faithful *
(vi) Cave Falls

Commercially guided
snowmobiles
12
160
114
20
12
** 50

Commercially guided snowcoaches
13
34
13
2
16
0

* Commercially guided snowmobile tours originating at the North Entrance and Old Faithful are
currently provided solely by Xanterra Parks and Resorts. Because this concessioner is the sole
provider at both of these areas, this regulation allows reallocation of snowmobiles between the North
Entrance and Old Faithful as necessary, so long as the total daily number of snowmobiles originating
from the two locations does not exceed 24. For example, the concessioner could operate 6
snowmobiles at Old Faithful and 18 at the North Entrance if visitor demand warranted it. This will allow
the concessioner to respond to changing visitor demand for commercially guided snowmobile tours,
thus enhancing the availability of visitor services in Yellowstone.
** These snowmobiles operate on an approximately 1-mile segment of road within the park where
the use is incidental to other snowmobiling activities in the Caribou-Targhee National Forest. These
snowmobiles do not need to be guided or to meet NPS air and sound emissions requirements.
(11) When may I operate my snowmobile or snowcoach ? The Superintendent will determine
operating hours and dates. Except for emergency situations, any changes to operating hours will be
made on an annual basis, and the public will be notified of those changes through one or more of the
methods listed in § 1.7(a) of this chapter.
(12) What other conditions apply to the operation of oversnow vehicles? (i) The following are
prohibited:
(A) Idling an oversnow vehicle for more than 5 minutes at any one time.
(B) Driving an oversnow vehicle while the driver's motor vehicle license or privilege is suspended
or revoked.
(C) Allowing or permitting an unlicensed driver to operate an oversnow vehicle.

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(D) Driving an oversnow vehicle in willful or wanton disregard for the safety of persons, property,
or park resources or otherwise in a reckless manner.
(E) Operating an oversnow vehicle without a lighted white headlamp and red taillight.
(F) Operating an oversnow vehicle that does not have brakes in good working order.
(G) The towing of persons on skis, sleds, or other sliding devices by oversnow vehicles, except in
emergency situations.
(ii) The following are required:
(A) All oversnow vehicles that stop on designated routes must pull over to the far right and next to
the snow berm. Pullouts must be used where available and accessible. Oversnow vehicles may not be
stopped in a hazardous location or where the view might be obscured, or operated so slowly as to
interfere with the normal flow of traffic.
(B) Oversnow vehicle drivers must possess a valid motor vehicle driver's license. A learner's
permit does not satisfy this requirement. The license must be carried by the driver at all times.
(C) Equipment sleds towed by a snowmobile must be pulled behind the snowmobile and fastened
to the snowmobile with a rigid hitching mechanism.
(D) Snowmobiles must be properly registered and display a valid registration from a state or
province in the United States or Canada, respectively.
(iii) The Superintendent may impose other terms and conditions as necessary to protect park
resources, visitors, or employees. The public will be notified of any changes through one or more
methods listed in § 1.7(a) of this chapter.
(iv) This paragraph (l)(12) also applies to non-administrative over-snow vehicle use by NPS,
contractor, or concessioner employees, or other non-recreational users authorized by the
Superintendent.
(13) What conditions apply to alcohol use while operating an oversnow vehicle? In addition to 36
CFR 4.23, the following conditions apply:
(i) Operating or being in actual physical control of an oversnow vehicle is prohibited when the
driver is under 21 years of age and the alcohol concentration in the driver's blood or breath is 0.02
grams or more of alcohol per 100 milliliters of blood or 0.02 grams or more of alcohol per 210 liters of
breath.
(ii) Operating or being in actual physical control of an oversnow vehicle is prohibited when the
driver is a snowmobile guide or a snowcoach driver and the alcohol concentration in the operator's
blood or breath is 0.04 grams or more of alcohol per 100 milliliters of blood or 0.04 grams or more of
alcohol per 210 liters of breath.
(iii) This paragraph (1)(13) also applies to non-administrative over-snow vehicle use by NPS,
contractor, or concessioner employees, or other non-recreational users authorized by the
Superintendent.
(14) Do other NPS regulations apply to the use of oversnow vehicles? (i) The use of oversnow
vehicles in Yellowstone is subject to §§ 2.18(a) and (c), but not subject to §§ 2.18 (b), (d), (e), and
2.19(b) of this chapter.
(ii) This paragraph (l)(14) also applies to non-administrative over-snow vehicle use by NPS,
contractor, or concessioner employees, or other non-recreational users authorized by the
Superintendent.

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(15) Are there any forms of non-motorized oversnow transportation allowed in the park? (i) Nonmotorized travel consisting of skiing, skating, snowshoeing, or walking is permitted unless otherwise
restricted under this section or other NPS regulations.
(ii) The Superintendent may designate areas of the park as closed, reopen such areas, or
establish terms and conditions for non-motorized travel within the park in order to protect visitors,
employees, or park resources. Notice will be made in accordance with § 1.7(a) of this chapter.
(iii) Dog sledding and ski-joring are prohibited.
(iv) Bicycles are prohibited on oversnow routes in Yellowstone.
(16) May I operate a snowplane in Yellowstone National Park? The operation of a snowplane in
Yellowstone is prohibited.
(17) Is violating any of the provisions of this section prohibited? (i) Violating any of the terms,
conditions or requirements of paragraphs (l)(1) through (l)(16) of this section is prohibited.
(ii) Anyone who violates any of the terms, conditions or requirements of this regulation will be
considered to have committed one separate offense for each term, condition or requirement that they
violate.
(m) Swimming. The swimming or bathing in a natural, historical, or archeological thermal pool or
stream that has waters originating entirely from a thermal spring or pool is prohibited.
[36 FR 12014, June 24, 1971]
EDITORIAL NOTE: For FEDERAL REGISTER citations affecting § 7.13, see the List of CFR Sections Affected,
which appears in the Finding Aids section of the printed volume and at www.fdsys.gov .

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