Where is Tongue River Reservoir?

Tongue River Reservoir is a lake in Big Horn County, Montana. Its water-quality measurements are published by Montana DEQ and shown on this page as reported.

How deep is Tongue River Reservoir?

Tongue River Reservoir has a maximum depth of 54 feet. The lake covers 2158 acres.

Are there boat ramps on Tongue River Reservoir?

Tongue River Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Tongue River Reservoir State Park. Public access is listed as yes.

Can I fish at Tongue River Reservoir?

Tongue River Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Montana's fish and wildlife agency, so check its current regulations before you go.

Are there campgrounds on Tongue River Reservoir?

Tongue River Reservoir has 5 public campgrounds from USGS The National Map within 5 km, including Rattlesnake Point Campground, Campers Point Campground, Pee Wee South Campground, Pee Wee North Campground. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.

Tongue River Reservoir

Big Horn County, Montana2,158 acresView map Directions

No nutrient or algae sampling on record from Montana DEQ for this lake.

Max depth

54 ft

Bathymetric survey

Area

2,158 acres

Surface area

Shoreline

38.4 mi

Measured length

Impaired · Algal growth
54 ft max depth
Public access

See the measurements Directions Where to stay

Tongue River Reservoir in Big Horn County, Montana has water-quality measurements published by Montana DEQ, shown here as reported. Maximum depth: 54 ft. Surface area: 2158 acres.

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Tongue River Reservoir is a 2,158-acre lake in Big Horn County, Montana with a maximum depth of 54 feet. Limited fish-species data available. Public access is available with 1 public boat landing.

Source: EPA Water Quality Portal sampling records, Montana DEQ. Methodology: how these readings are compared.

What Tongue River Reservoir is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp
Camping5 public campgrounds nearby
Deep water54 ft surveyed max depth
Big water2,158 acres

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Tongue River Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, oxygen depletion (low DO), sediment / turbidity. Check local advisories before you swim.

Whether Tongue River Reservoir is safe to swim in today is a call for the Montana Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Tongue River Reservoir

These are the measurements Montana DEQ publishes for Tongue River Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

No clarity data. TSI undefined.

Ask about Tongue River Reservoir

Answers come straight from the public measurements and survey records on this page.

Lake Details

Max depth

54 ft

Surface area

2,158 acres

Shoreline

38.4 mi

Public access

Yes

Listed by Montana DEQ

Recreation & Access

Boat Landings

Yes

Public Access

Campgrounds

Tongue River Reservoir State ParkPublic

Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps

Public campgrounds near Tongue River Reservoir

Rattlesnake Point Campground0.8 km
Campers Point Campground1.5 km
Pee Wee South Campground2.0 km
Pee Wee North Campground2.5 km
Sand Point Campground3.0 km

Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes

Stays via Stay22

Stays near Tongue River Reservoir

Compare lakeside cabins, hotels, and vacation rentals near Tongue River Reservoir in Big Horn County, Montana — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near Tongue River Reservoir

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Fishing Tongue River Reservoir

→ Tongue River Reservoir fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Tongue River Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2021 EPA reporting cycle (IR category 5).

Causes of impairment

Algal growthOxygen depletion (low DO)Sediment / turbidity

Designated uses not supporting: Aquatic life.

Source: EPA ATTAINS assessment unit MT42B003_010 · Official waterbody report

Nearby Lakes in Big Horn County

Lodge Grass Storage Reservoir39.6 miView →Arapooish Pond—View →Bighorn LakeEutrophic—View →Castle Rock Lake—View →Barley Reservoirs—View →Donleys Reservoir—View →

Frequently asked questions about Tongue River Reservoir

Where is Tongue River Reservoir?: Tongue River Reservoir is a lake in Big Horn County, Montana. Its water-quality measurements are published by Montana DEQ and shown on this page as reported.
What is the water quality of Tongue River Reservoir?: Tongue River Reservoir in Big Horn County, Montana has water-quality measurements published by Montana DEQ, shown here as reported. Maximum depth: 54 ft. Surface area: 2158 acres.
Is Tongue River Reservoir safe to swim in?: Nutrient and algae readings are not a swimming clearance. Tongue River Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, oxygen depletion (low DO), sediment / turbidity. Check local advisories before you swim.
How deep is Tongue River Reservoir?: Tongue River Reservoir has a maximum depth of 54 feet. The lake covers 2158 acres.
Are there boat ramps on Tongue River Reservoir?: Tongue River Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Tongue River Reservoir State Park. Public access is listed as yes.
Can I fish at Tongue River Reservoir?: Tongue River Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Montana's fish and wildlife agency, so check its current regulations before you go.
Are there campgrounds on Tongue River Reservoir?: Tongue River Reservoir has 5 public campgrounds from USGS The National Map within 5 km, including Rattlesnake Point Campground, Campers Point Campground, Pee Wee South Campground, Pee Wee North Campground. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.