Big Therriault Lake Campground
The campground is currently in its shoulder season. The managed operating season runs approximately June 29 through September 8, when potable water and campground host services are available. Access outside this window depends on road conditions; high-elevation forest roads may remain impassable due to lingering snowpack into June. The campground operates first-come, first-served with no advance reservations.
Air Quality Alert issued August 9 at 8:15AM MDT by NWS Great Falls MT
AQAMT The Montana Department of Environmental Quality has issued an air quality alert for Beaverhead, Deer Lodge, Flathead, Granite, Jefferson, Lake, Lewis and Clark, Lincoln, Madison, Mineral, Missoula, Powell, Ravalli, Sanders, Silver Bow counties in effect until 9AM on 08/10/2026 An Air Quality Alert means that particulates have been trending upwards and that an exceedance of the 24 hour National Ambient Air Quality Standard (NAAQS) has occurred or may occur in the near future. Elevated particulate levels from wildfire smoke As of 7AM on 08/09/2026, particulate levels in Columbia Falls are Very Unhealthy. As of 7AM on 08/09/2026, particulate levels in Dillon, Libby and Thompson Falls are Unhealthy. As of 7AM on 08/09/2026, particulate levels in Billings, Butte, Hamilton, Lewistown and Sleeping Giant are Unhealthy for Sensitive Groups. As of 7AM on 08/09/2026, particulate levels in Cut Bank, Frenchtown, Great Falls, Havre, Helena, Malta and Missoula are Moderate. When air quality is Very Unhealthy... State and local health officials recommend that people with respiratory or heart disease, the elderly, and children should avoid any outdoor activity; everyone else should avoid prolonged exertion. When air quality is Unhealthy... State and local health officials recommend that people with respiratory or heart disease, the elderly, and children should avoid prolonged exertion; everyone else should limit prolonged exertion. When air quality is Unhealthy for Sensitive Groups... State and local health officials recommend that people with respiratory or heart disease, the elderly and children should limit prolonged exertion. When air quality is Moderate... State and local health officials recommend that unusually sensitive people should consider reducing prolonged or heavy exertion. For more information visit the Montana Department of Environmental Quality at http://todaysair.mtdeq.us
Northern Region Camping & Target Restrictions, Pallet Prohibition
This order defines the maximum length of occupation at a single location or cumulatively at any number of locations within a calendar year, within the states of Montana, North Dakota, South Dakota, and Idaho
Weed Free Forage & Mulch Products Order for the Northern Region
It is illegal to possess, store or transport straw, hay, grain, seed or other forage or mulch products on Forest Service lands without documentation that the product is certified as “weed free” by a state certification process that meets or exceeds the North American Weed Free Forage standards.
About
Big Therriault Lake Campground occupies a scenic setting in the Ten Lakes Scenic Area of Kootenai National Forest, roughly 12.5 air miles from Fortine, Montana. The high-elevation lake sits near the Canadian border in Lincoln County, surrounded by subalpine terrain that provides excellent hiking, fishing, and wildlife viewing opportunities. The lake is stocked with westslope cutthroat trout. The campground has 10 sites including one campground host site. Each site features a picnic table and fire ring. Shared amenities include vault toilets, potable water, bear-resistant food storage boxes, and a boat ramp designed for small watercraft such as canoes, kayaks, and small fishing boats. Sites accommodate RVs and trailers up to 32 feet. Access to the campground requires travel on forest roads that typically remain snow-covered into late June. While the campground is technically accessible year-round, the managed season runs from late June through early September when facilities are maintained and water is available.
Directions
From Fortine, Montana, travel west on Grave Creek Road. Continue to Forest Road 114 (Therriault Lakes Road) and follow signs to Big Therriault Lake. The campground is approximately 12.5 air miles from Fortine via forest roads. High-clearance vehicles recommended; roads may be rough and impassable when wet or snow-covered.
Amenities
| Water | Yes |
| Fires Allowed | Yes |
| Toilets | Yes |
| Dump Station | No |
| Wifi | No |
| Pets Allowed | Yes |
| Showers | No |
| Electric Hookups | — |
| Water Hookups | — |
| Sewer Hookups | — |
| Camp Store | No |
| Price | $10 |
Vehicle
| Max RV Length | 32ft |
| Max Trailer Length | 32ft |
| Big Rig Friendly | No |
| Pull Through Sites | — |
Contact
| Phone | +1 (406) 293-6211 |
Cell Service
| AT&T | Yes |
| Verizon | None |
| T-Mobile | None |
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