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
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.
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.