Yampa River - Dinosaur National Monument River Guide

Yes — a permit from Recreation.gov is required for all private trips on the Yampa River through Dinosaur National Monument. Low-use dates and unclaimed high-use permits become available at 8:00 AM MT on March 6 each year.

The Yampa River runs Class II–IV, with Warm Springs Rapid (Class IV) being the most significant feature. Warm Springs formed in 1965 after a flash flood dramatically reshaped the channel and is now the most powerful and closely scouted rapid on the river.

The Yampa is the last major free-flowing river in the Colorado River system — it runs entirely on natural snowmelt from the Flat Tops Wilderness with no upstream dams. This makes its flow timing and character fundamentally different from regulated rivers, giving it a wild, unpredictable energy no dam-controlled river can replicate.

The Yampa River season is driven by snowmelt from the Flat Tops Wilderness, typically running from late April through late June. The window is short — most seasons peak in May and can shut down by early July in drought years — making permit timing critical.

Warm Springs Rapid (Class IV) is the Yampa's defining feature — a powerful, technical drop that formed in 1965 and is carefully scouted by nearly every group. Other notable rapids include Tepee, Hells Half Mile (Class III+), and several significant drops through Whirlpool Canyon after the confluence with the Green River.