Missouri Headwaters State Park marks one of the most historically significant spots in Montana — the exact confluence where the Jefferson, Madison, and Gallatin rivers merge to form the mighty Missouri River. Lewis and Clark camped here in July 1805, and standing at the headwaters today feels like stepping into that same moment of discovery. The park’s 532 acres in Gallatin County sit at the base of towering limestone cliffs, where three valleys converge into a dramatic landscape unlike anywhere else in the state.

Hiking trails wind along the riverbanks and up to overlooks where you can see all three rivers meeting below. The interpretive trail to Fort Rock is a must — it climbs to a limestone outcrop with panoramic views of the confluence and the Tobacco Root Mountains beyond. Fishing is excellent here, with brown and rainbow trout in all three rivers, and the calmer stretches of the Jefferson are ideal for wading. Birders will find osprey, great blue herons, and bald eagles hunting along the waterways.

The park offers both tent and RV camping sites nestled among cottonwood groves near the river, making it a solid base for exploring the Three Forks area. Sites fill up on summer weekends, so plan ahead for July and August visits.

Late June through September is prime season, when water levels settle and the valleys turn golden. Spring brings higher water and wildflowers. Even a short stop here rewards you with a landscape that shaped American history.

Explore Nearby

• Garnet Winter Trails — Public Land in Montana
• Axolotl Lakes — Public Land
• Gallatin National Forest — National Forest in Montana
• Helena–Lewis and Clark National Forest — National Forest in Montana
• Pioneer Historic Byway — Scenic Byway in Idaho