USDA Forest Service · Montana
Big Therriault Lake Campground
USDA Forest Service · Montana, United States
- Drinking water
- No
- Elevation
- 5,548 ft
- Dark sky
- Bortle class 1
- Cell coverage
- T-Mobile none · AT&T none · Verizon none (carriers' 4G LTE filings to the FCC, 2025-12; not measured here)
- Access road
- BIG THERRIAULT LAKE (NFSR 7116) · crushed aggregate or gravel · suitable for passenger cars
- Lake
- Kootenai National Forest
- Nearest town
- Eureka
- Address
- MT
- Activities
- <p> The lake is 56 acres in size with an average depth of 40 feet. The shoreline is 1.22 miles in length. Westslope cutthroat trout is the most common fish caught, but other species are present.</p> <p> Visit <a href="http://fwp.mt.gov/fishing/regulations/">Montana Fish, Wildlife and Parks</a> web site for fishing regulations.</p> , Boating, Camping
Season dates aren't confirmed for this campground yet - opening and closing dates haven't been verified. Check the operator's page or call ahead before you plan a trip.
Site map
The imagery of the campground. Press and hold the map to drop your own pins and notes; the operator publishes no site points here. Your ratings, notes, pins and photos are kept with the campground on your Saved list, the same list the camping map and the drive page keep.
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About
The Big Therriault Lake campground is located 12.5 air miles from Fortine. The campground has 10 campsite, including one host site, with tables, fire rings and able to accomodate up to a 32' rv. Amenities include potable water, vault toilets, food storage boxes and boat ramp developed for small boats.
Weather, month by month
| Month | Typical high | Typical low | Coldest night | Hottest day | Years with a night below 32°F |
|---|---|---|---|---|---|
| January | 25° | 13° | -40° | 32° | 11 of 11 |
| February | 24° | 8° | -31° | 36° | 11 of 11 |
| March | 34° | 19° | -12° | 51° | 11 of 11 |
| April | 38° | 24° | 2° | 58° | 11 of 11 |
| May | 52° | 32° | 23° | 74° | 10 of 11 |
| June | 60° | 39° | 29° | 79° | 5 of 11 |
| July | 74° | 50° | 38° | 85° | 0 of 11 |
| August | 73° | 49° | 40° | 88° | 0 of 11 |
| September | 61° | 42° | 29° | 75° | 2 of 11 |
| October | 44° | 29° | 19° | 62° | 10 of 10 |
| November | 31° | 21° | -8° | 46° | 10 of 10 |
| December | 25° | 17° | -17° | 36° | 10 of 10 |
Mid-month figures from 2016–2026 of daily weather at this spot (ERA5 reanalysis via Open-Meteo, CC BY 4.0), in °F. Typical is the median; coldest and hottest are the extremes seen.
Trails nearby
All 465 trails in Kootenai National Forest
Trailheads the Park Service and the Forest Service map; each trail's page has its length, climbing and the Service's description.
Nearby campgrounds
- Little Therriault Lake Campground · USDA Forest Service · 1 mi
- Mt. Wam Lookout Cabin Rental · USDA Forest Service · 3 mi · 1 sites
- Grave Creek Campground · USDA Forest Service · 8 mi
- Rock Lake · USDA Forest Service · 10 mi
- Frozen Lake · BC Recreation Sites · 11 mi · 5 sites
All public campgrounds in Montana · Every state and province · Facts read from the operator 2026-02-25. Confirm fees, rules and current status with the operator before you go.