Yampa River rafting
The short answer
The Yampa River is the last major free flowing river in the Colorado system. Small reservoirs sit on its headwaters, but nothing regulates the flow through Dinosaur National Monument, so it runs on snowmelt and the season is roughly May to July. Four to five days and about 71 river miles, Class II to III with one Class IV at Warm Springs, ending where it joins the Green at Echo Park.
Guided trips are the realistic way on, because outfitters hold allocated permits while private launches go to a lottery. It is roughly five and a half hours from Moab, so treat it as a destination rather than an add on.
- Difficulty
- Class II to III, one IV
- This run
- About 71 river miles
- Trip lengths
- 4 to 5 days
- Season
- May to July
- From Moab
- About 5.5 hours
No dam, and everything follows from that
Almost every major river in the Colorado system is regulated by dams that even out the flow across the year. The Yampa is the significant exception. Two small reservoirs sit far upstream on its headwaters, but nothing controls the water through Dinosaur, and running on snowmelt alone changes the trip in several concrete ways.
| A short season | Roughly May to July. By late summer flows drop too low for commercial trips. There is no release to extend it |
|---|---|
| Wide year to year variation | A big snow year and a poor one produce genuinely different rivers. Outfitters adjust itineraries and minimum ages accordingly |
| Warm, silty water | Free flowing rivers carry their sediment. The Yampa runs warmer and muddier than the dam released Green it joins, and the colour difference at the confluence is usually visible |
| A natural flood cycle | Spring peaks rebuild sandbars and beaches, which is why the camps here are good and why the river supports native fish that struggle elsewhere in the basin |
That last point is why the river matters beyond rafting. The Yampa is one of the few places in the basin where a broadly natural flow regime survives, and American Whitewater has made keeping it that way a long running stewardship priority. If you want to understand what the numbers on a gauge actually mean before you pick dates, see how to read a flow report.
Four days through Dinosaur
Trips launch at Deerlodge Park and run 46 miles of Yampa Canyon down to the confluence with the Green at Echo Park, then continue about 24 miles on the Green through Whirlpool Canyon and Split Mountain Canyon to the takeout. Around 71 river miles in total, and four to five days depending on the outfitter.
| Roughly | Class | What happens |
|---|---|---|
| Day one | II to III | Launch at Deerlodge Park, Yampa mile 0. The river enters the box canyon within about a mile and a half, then Anderson Hole at mile 1.2 and Tepee Rapid at mile 9.5 as the walls close in |
| Day two | II to III | Little Joe and then Big Joe at mile 21.9, where the river squeezes down over rocky debris, followed by long meanders through the middle canyon |
| Day three | II to III | Beach camps like Harding Hole and Laddie Park, then Tiger Wall at mile 37.1, the varnished face that rises straight out of the water. Camp within striking distance of the big one |
| Day four | IV | Warm Springs at mile 41.6, scouted from river right before anyone runs it, then four and a half miles down to Echo Park beneath Steamboat Rock |
| Final day | II to III+ | Now on the Green. Jones Hole at Green mile 5.8 for rock art and a side hike, then Whirlpool Canyon, the open water of Island Park, and Split Mountain Canyon to the boat ramp at Green mile 24.4 |
Two rivers means two mile systems. Yampa miles count from Deerlodge Park; the count restarts at zero on the Green at Echo Park. Itineraries also vary with flow and outfitter, and the river genuinely changes year to year, so treat the table as the shape of the trip rather than a schedule.
One common mix up worth clearing up: Hell's Half Mile, which people often associate with Dinosaur, is in Lodore Canyon on the Green upstream of Echo Park. A Yampa trip joins the Green at the confluence, below Lodore, so it never runs that rapid. For that one you want Gates of Lodore.
Warm Springs Rapid
Yampa mile 41.6, four and a half miles above Echo Park, and a young rapid by any standard. A debris flow out of Warm Springs Draw in 1965 reshaped the riverbed and built it. Scouted from river right, and the last hole, Maytag, is the one that flips boats.
Tiger Wall
Yampa mile 37.1. A sheer sandstone face streaked with dark desert varnish, rising straight out of the water above Warm Springs. Tradition says you kiss it for luck before the big rapid, and most crews do.
Harding Hole
A wide bend with one of the better beach camps on the run, backed by high walls. The natural flood cycle is what keeps beaches like this replenished, and camps are assigned when your permit is issued.
The dam that was never built
What happened
In the 1950s a 529 foot concrete arch dam was proposed at Echo Park as part of the Colorado River Storage Project. It would have flooded significant stretches of both the Green and Yampa canyons. The campaign against it succeeded, Glen Canyon was built instead, and it is widely regarded as a formative moment for the modern conservation movement in the United States.
Why it still matters
That decision is the reason the Yampa still runs free and the reason this trip exists in its current form. Standing at the confluence, with Steamboat Rock above you and both rivers meeting below it, is the point of the whole journey for a lot of guests. A second dam at Split Mountain was shelved with it.
Permits, and the three ways on
The National Park Service manages the Yampa through Dinosaur National Monument and caps launches tightly. Permits are required year round, and the high use season, the second weekend in May to the second weekend in July, runs on a lottery with applications due 31 January. Private odds are long. That is worth knowing early rather than late, because there are three genuine routes on and only one of them depends on winning anything.
| Route | How it works |
|---|---|
| Guided multi day | Outfitters hold allocated commercial permits, so you are booking a seat rather than entering a draw. This is how most people run the Yampa. Dates still go early, so book a year ahead where you can |
| Private lottery | Apply by 31 January for the high use season. Odds are long, and camps are assigned with the permit. Worth entering every year if you have the gear and experience |
| Split Mountain day trip | The last 8 miles, Rainbow Park to Split Mountain, run as a separate day permit with up to two launches a day in summer. It is the busiest whitewater of the multi day trip, in an afternoon, without the lottery |
Picking your window
| Window | What to expect |
|---|---|
| May | Peak snowmelt. The biggest, coldest, fastest water. Highest minimum ages and the most serious version of Warm Springs |
| June | Still strong, warming up. For many people the best balance of water and comfort |
| Early July | Dropping. Warmer air and water, more technical rapids. The tail of the season |
| After July | Generally too low for commercial multi day trips. There is no dam release to extend the season |
Because the season is short and launches are capped, limited availability here is a fact of the permit system rather than a sales tactic. If the Yampa does not work out, Gates of Lodore runs through the same national monument on a longer season, and Desolation Canyon is the closest match for a multi day wilderness canyon that runs every year. Our outfitter comparison and river safety guide cover the rest.
Common questions
Why is the Yampa River season so short?
Because nothing regulates it through Dinosaur. Every other major river in the Colorado system has a dam that releases water through the summer and extends the season. The Yampa runs on snowmelt alone, so flows peak in May and drop through June and July. By late summer there is usually not enough water for commercial multi day trips.
How difficult is the Yampa River?
Class II to III for most of its length, with one Class IV at Warm Springs Rapid, which is genuinely serious at high flows. The Green below Echo Park runs Class II to III+. Guided guests without prior experience do run it, but you should be fit and comfortable in moving water. It is broadly comparable to Gates of Lodore.
What is Warm Springs Rapid?
The largest rapid on the run, at Yampa mile 41.6, four and a half miles above Echo Park. A debris flow out of Warm Springs Draw in 1965 reshaped the riverbed and created it, which makes it very young as rapids go. It is scouted from river right before running, and the final hole, Maytag, is the one that flips boats.
How long is the Yampa River?
About 250 miles from its headwaters in the Rocky Mountains of northwestern Colorado to the Green River at Echo Park. The rafting trip covers the last 46 miles of it, plus about 24 miles of the Green down to Split Mountain, for roughly 71 river miles in total.
Does a Yampa trip run Hell's Half Mile?
No. Hell's Half Mile is in Lodore Canyon on the Green River, upstream of Echo Park. A Yampa trip joins the Green at the confluence, below Lodore, so it never passes that rapid. If Hell's Half Mile is what you are after, book Gates of Lodore instead.
How hard is it to get a Yampa permit?
For private trips, hard. The National Park Service caps launches and allocates high use season permits by lottery, with applications due 31 January. Commercial outfitters hold allocated permits, so booking a guided trip is the realistic route, though those fill early too. There is also a separate day permit for the last 8 miles from Rainbow Park through Split Mountain Canyon.
Can I raft the Yampa in one day?
Not the Yampa itself, but you can run the final stretch of the trip. The 8 miles from Rainbow Park through Split Mountain Canyon to the Split Mountain boat ramp is permitted as a day trip, with up to two launches a day in the summer season. It covers Moonshine, S.O.B., Schoolboy and Inglesby, which is the busiest whitewater of the multi day itinerary.
How far is the Yampa from Moab?
Roughly five and a half hours by road. Dinosaur National Monument sits on the Colorado and Utah border well north of Moab, and most trips meet in Vernal, Utah. Treat it as a destination trip rather than an addition to a Moab itinerary, and plan travel days either side.
What is Echo Park?
The confluence where the Yampa joins the Green beneath Steamboat Rock, at Yampa mile 46. A 529 foot dam was proposed there in the 1950s that would have flooded much of Dinosaur National Monument, and the campaign that stopped it is regarded as a formative moment for the modern conservation movement. It is the reason the Yampa still runs free.
The last free river
A short season and capped launches mean Yampa dates go a year out. If the multi day does not work, the Split Mountain day trip and Gates of Lodore both run the same country.
We compare trips, we do not run them. Every trip is operated by a third party outfitter holding a current National Park Service concession permit. How this site is funded.