Thompson Falls State Park sits along the Clark Fork River in Sanders County, Montana, offering 36 acres of riverside recreation in the heart of western Montana’s mountain country. The park takes its name from the nearby town and the historic falls on the Clark Fork — a natural landmark that drew David Thompson, the famed explorer and cartographer, through this corridor in the early 1800s.

The Clark Fork River dominates the experience here. Anglers work the water for rainbow and brown trout, while the riverbank provides a quiet setting for picnicking and wildlife watching. Osprey nest along the river corridor, and white-tailed deer move through the cottonwood groves that shade much of the park. A short walk from the park leads to a viewing platform overlooking Thompson Falls Dam, where visitors can watch water cascade through the spillway — a worthwhile stop even for those just passing through on Highway 200.

The park’s compact size makes it an easy half-day destination or an overnight stop for travelers moving between Missoula and Sandpoint. Flat, shaded sites near the river are well-suited for tent camping, though amenities are basic — expect vault toilets and no hookups.

Summer and early fall bring the best conditions, with warm days ideal for swimming and fishing. July and August see the most visitors, but the park rarely feels crowded. Spring runoff on the Clark Fork can be dramatic, making May and June appealing for those who enjoy watching big water move through a narrow valley.

Explore Nearby

• White Mountain National Forest — National Forest in New Hampshire, Maine
• White Mountain Trail — Scenic Byway in New Hampshire
• Kancamagus Scenic Byway — Scenic Byway in New Hampshire
• Mount Orne Bridge — Covered Bridge in New Hampshire
• Mount Orne Bridge — Covered Bridge in Vermont