03. Echo Park (CO) to Split Mountain

The Green River from Echo Park to the Split Mountain Boat Ramp offers a stunning 26-mile journey through the heart of Dinosaur National Monument. This scenic stretch represents the second half of two classic multi-day trips: the Green River through Lodore Canyon or the Yampa River from Deerlodge Park. Boaters completing either trip converge at Echo Park, where the Yampa meets the Green, before continuing downstream toward the takeout at Split Mountain. For those seeking a shorter adventure, the final 8 miles—from Rainbow Park to Split Mountain Campground, known as the Split Mountain Daily—can be enjoyed as a permitted day trip (up to two launches per day in the summer season and one per day the rest of the year). The journey begins at Echo Park, where the Green River carves into Whirlpool Canyon, a peaceful and relatively gentle section defined by towering limestone walls and sweeping curves. Whirlpool Canyon’s quiet beauty and typically mellow water (Class I–II) offer paddlers a chance to enjoy the geology and reflect on the historic efforts to protect this landscape. In the 1950s, Echo Park was the proposed site of a major dam, part of the controversial Colorado River Storage Project. The ensuing battle became a landmark victory for the American conservation movement, with public outcry—led by the Sierra Club and supported by river runners and American Whitewater—ultimately halting the dam’s construction and preserving Dinosaur National Monument as a wild river corridor. Cultural and archaeological sites further enrich the landscape. A side hike up Jones Hole Creek—accessible near its confluence with the Green at a popular river runner’s camp—leads to Fremont petroglyphs and pictographs, along with fishing and hiking opportunities through a lush, spring-fed canyon. This area has long been a crossroads of human presence, offering a window into thousands of years of Indigenous habitation and artistry. Just downstream of Whirlpool Canyon, the river widens briefly before entering the dramatic terrain of Split Mountain Canyon. Rainbow Park, located just upstream of the canyon’s entrance, serves as the primary access point and put-in for those running the Split Mountain Daily. From here, the final 8 miles to Split Mountain Campground deliver a thrilling run through striking red rock scenery. The river picks up speed, carving through jagged cliffs and offering a series of fun Class II to III- rapids (depending on flow). Paddlers can expect lively wave trains, technical rock dodging, and playful surf spots. At moderate flows around 3,000 cfs, it’s an exciting and scenic stretch with splashy rapids and beaches tucked beneath towering canyon walls. Split Mountain Canyon was once considered for another dam site, but like Echo Park, it was spared. Today, both canyons remain free-flowing and open to exploration—their preservation a testament to the lasting impact of conservation advocacy. Whether you're completing a longer journey through Gates of Lodore on the Green or from Deerlodge Park on the Yampa, or simply enjoying the accessible thrills of the Split Mountain Daily, this segment of the Green River offers a rich combination of natural beauty, exciting whitewater, and powerful conservation history. The next river section downstream continues from Ouray to Green River Town, through the remote and dramatic Desolation and Gray Canyons.