🏆🏆🏆 Big River Trail — Multi-use trail along the Minnesota River through the broad glacial river valley
Minnesota River State Trail follows the Minnesota River through the broad, flat-bottomed valley carved by glacial River Warren — the massive outflow of glacial Lake Agassiz that drained approximately 11,000 years ago. The river valley is dramatically oversized for the modern Minnesota River — evidence of the ancient flood that carried 10 times the volume of all the Great Lakes combined. The trail provides views of this geological history, plus excellent birding along the river corridor.
Visitor Information
| Detail | Information |
|---|---|
| Location | Minnesota River Valley |
| Trail | Multi-use |
| Fee | Free |
| Geology | Glacial River Warren valley |
Frequently Asked Questions
Why is the valley so wide?
The modern Minnesota River occupies a valley carved by glacial River Warren — a catastrophic flood that drained glacial Lake Agassiz about 11,000 years ago. The valley is up to 5 miles wide and 250 feet deep, far too large for the modern river.
Why is the Minnesota River valley so wide?
The Minnesota River is tiny compared to its valley because the valley wasn’t carved by the Minnesota River — it was carved by glacial River Warren, a massive flood torrent that drained glacial Lake Agassiz about 9,400 years ago. The lake was larger than all the modern Great Lakes combined. The flood carved the oversized valley in a geological instant.
Keep exploring: The closest neighbors are Traverse des Sioux State Park (a short drive away) and Minnesota Valley State Recreation Area (within about an hour’s drive).
🌊 Visit Minnesota River Trail
Glacial megaflood valley — trail through the oversized valley of River Warren.
About Minnesota River Trail
Minnesota River State Trail follows the Minnesota River through the broad glacial valley carved by River Warren — a massive outflow from glacial Lake Agassiz at the end of the last Ice Age. The current Minnesota River is a “misfit stream” — far too small for the enormous valley it occupies. The trail passes through some of the richest agricultural land in the world.
Things to Do
Biking and hiking through the glacial valley, birdwatching (the river valley is a major migration corridor), learning about glacial geology, cross-country skiing, and exploring the Minnesota River’s agricultural heartland.
Insider Tips
Glacial valley: Minnesota River Trail follows the massive valley carved by glacial River Warren — a valley 1-5 miles wide that dwarfs the current river. Pro tip: The trail offers excellent birding — bald eagles, pelicans, and waterfowl use the river corridor. Fort Ridgely: Nearby Fort Ridgely (1853) played a central role in the US-Dakota War of 1862 — the garrison withstood two Dakota attacks.
Best Time to Visit
Fall: Valley foliage and eagle migration. Spring: High water reveals the valley’s scale. Summer: Cycling and fishing. Winter: Eagle watching near open water.
Wildlife & Nature
Minnesota River Trail — follows the Minnesota River valley through Glacial River Warren’s ancient channel. The river valley — carved by a massive glacial river 10,000 years ago — is far wider than the current river. Bald eagles concentrate along the river. White pelicans fish in groups. Sandhill cranes call from the marshes.
Nearby Attractions
Minnesota Valley NWR — along the trail. Fort Snelling SP — eastern terminus. Mankato — along the valley. New Ulm — along the valley.
