Follow the Green River from Gates of Lodore to Split Mountain, about 44 river miles through Dinosaur National Monument in Colorado and Utah.
The Lodore view follows the first 19 miles to the Yampa confluence at Echo Park. The Whirlpool view continues through Whirlpool Canyon and the open valleys of Island and Rainbow parks. The final nine miles pass through Split Mountain Canyon.
Choose a stretch, search for a rapid or river mile, and tap a marker. Every named rapid opens an aerial close-up and an authentic USGS topographic view. Previous and Next place follow the river downstream.
The collection records a Gates of Lodore journey dated August 14, 2009. This atlas shows the full reference corridor; it does not establish the trip’s end date, camps, daily itinerary, or photograph locations.
The river line follows connected USGS National Hydrography Dataset flowlines. USGS GNIS supplies geographic names and landmark reference points; river-specific public RiverBrain records supply the rapid and boat-ramp points. This edition shows 11 named rapids, three access areas, and seven landmarks.
Miles count downstream from the Lodore boat ramp. They follow the mapped river line, adjusted to the NPS’s rounded 19-mile Echo Park, 35-mile Rainbow Park, and 44-mile Split Mountain distances. They are approximate explorer miles and differ from the historic Green River mileage system, which counts downriver toward zero.
Rapid class ranges are reference ratings from the linked RiverBrain detail pages. Ratings vary with water level and publications. Aerial dates vary; callouts identify representative geography rather than surveyed hazards or a route through a rapid. Use the NPS’s current information and a current river guide for trip planning.
Sources checked October 25, 2026. Topography, river line, and geographic names: USGS. Corridor distances and river overview: NPS. Reference class ranges and additional locations: RiverBrain. Satellite imagery: Esri and contributors.