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40.49480446237747°N 109.17350657599626°W
Green River — UT

Rainbow Park

7 miles Class I–I 1 days Permit required
Flow Check Jensen gauge (USGS 09261000) — this is a flatwater transit segment; flow...
Season May and June are the best months; segment is primarily a transit stop rather...
Duration 1–1 days (typical 1)
Permit NPS permit required for overnight camping — confirm day-use rules with Dinosaur...
Shuttle 12 mi — 0.4 hrs
Logistics Short shuttle and road-accessible ramps make Rainbow Park the most logistically...
Rainbow Park
Overview

Rainbow Park is a brief cottonwood valley interlude between Whirlpool and Split Mountain — a mellow 7-mile flatwater float that serves as the standard staging area for Split Mountain day trips and overnight camps.

Rainbow Park is a short, calm interlude between Whirlpool Canyon and Split Mountain Gorge — the Green River spreads wide through a cottonwood-fringed valley before narrowing back into canyon walls for the Split Mountain run. This 7-mile flatwater segment serves primarily as the standard put-in for Split Mountain day trips and as a mellow transition camp for groups moving through the full Dinosaur river system. The Rainbow Park boat ramp is an NPS facility with road access from Jensen, Utah.

Trip styles
day trip, section float
Ideal for
Dinosaur multi-day paddlers transitioning between Whirlpool and Split Mountain, families seeking a gentle overnight camp, Split Mountain day-trip staging
River type
canyon river, flatwater
7 miles
1 days typical
Flows & Hydrology

Flow is best tracked at the downstream Jensen gauge; this flatwater segment has no hydraulic hazards and flow primarily affects travel speed.

Reference Gauges

Green River at Jensen, UT

Primary operational gauge for planning Split Mountain Canyon floats. Located near Jensen, UT, below Dinosaur National Monument, this gauge integrates snowmelt from the Uinta Basin watershed and is the most direct reading for Split Mountain and lower Lodore trip planning.

Current flow — Green River at Jensen, UT

Updating… Provisional

The Jensen gauge (USGS 09261000) is located just downstream and is the standard flow reference for this section of the Green River.

7-Day Forecast

Loading forecast…
Seasonality
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Follows Green River snowmelt pattern — peak May–June, tapering through summer.

Spring
cold water, afternoon wind on open valley
Summer
heat, low water, reduced current
Geology

Rainbow Park sits in an open valley at the structural hinge between Whirlpool Canyon and the Split Mountain anticline. The valley represents a brief respite in the canyon system where the river's gradient eases before it plunges back into the gorge.

Rock Record
Split Mountain Anticline
Weber Sandstone
Province
Colorado Plateau
Rock types
sandstone · limestone
Ecology
History
Logistics

Rainbow Park is the most accessible point in the Dinosaur river system — paved approach from Jensen, short shuttle to Split Mountain take-out, and NPS facilities at both ends.

Gear
Camp Kitchen

On a seven-day trip, you'll cook roughly 20 meals on a folding table in the sand. The constraint isn't ambition — it's ice management. Days one through three, you have real cooler capacity. Days four and five are the transition zone. Days six and seven are pantry cooking.

The best river cooks plan backward from the last night. If your final dinner is still good — not just edible, but genuinely good — the trip ends on a high.

Dinner Ideas by Trip Day
7River miles
Reading the River

Books that shape the science, history, and stories behind this place.

Canyon Country

Canyon Country

Donald L. Baars · 1989

An accessible introduction to the rock layers, canyon formation, and landscapes of the Colorado Plateau and canyon country.

knowledge
Down the Great Unknown

Down the Great Unknown

Edward Dolnick · 2002

The dramatic story of John Wesley Powell's first expedition through the Grand Canyon and the birth of river exploration in the American West.

storytelling cultural context knowledge
Fluvial Processes in Geomorphology

Fluvial Processes in Geomorphology

Luna B. Leopold, M. Gordon Wolman, John P. Miller · 1964

A foundational scientific text on river geomorphology, covering sediment transport, channel form, fluvial dynamics, and the physical processes that shape river systems.

knowledge
Geology of Utah's Rivers

Geology of Utah's Rivers

William T. Parry · 2016

A geological exploration of Utah’s major river systems explaining how tectonics, sedimentation, and erosion shaped the canyon landscapes of the Colorado Plateau and surrounding regions.

knowledge
How to Read Water

How to Read Water

Tristan Gooley · 2016

A guide to understanding the subtle clues in water movement—from puddles and rivers to oceans—teaching readers how currents, waves, surface textures, and patterns reveal information about wind, depth, obstacles, and landscape.

knowledge tone
Introduction to Physical Hydrology

Introduction to Physical Hydrology

Martin R. Hendriks · 2010

A rigorous, university-level introduction to physical hydrology covering the full water cycle — precipitation, evapotranspiration, infiltration, groundwater, runoff generation, and streamflow — with quantitative methods throughout. The scientific foundation for understanding how rivers work at the watershed scale, from snowpack in the Rockies to baseflow in canyon rivers.

knowledge
River Mechanics

River Mechanics

Pierre Y. Julien · 2002

A rigorous graduate-level treatment of river hydraulics and sediment transport, covering flow resistance, bedforms, channel stability, and the physical mechanics that govern river behavior.

knowledge
River Runners' Guide to Utah and Adjacent Areas

River Runners' Guide to Utah and Adjacent Areas

Gary C. Nichols · 2009

A comprehensive guidebook to whitewater rivers in Utah and neighboring regions, covering river access, rapids, flow considerations, trip logistics, and historical context for river runners.

knowledge
The Colorado Plateau

The Colorado Plateau

Donald L. Baars · 1983

A key geological reference for understanding the uplift, stratigraphy, tectonics, and erosional history of the Colorado Plateau.

knowledge
The Control of Nature

The Control of Nature

John McPhee · 1989

Three deeply reported narratives about humanity's attempts to stop rivers, lava, and debris flows — and what the land does in return. A masterwork of geological journalism that asks whether nature can ever truly be controlled.

tone storytelling philosophy knowledge
The Exploration of the Colorado River

The Exploration of the Colorado River

John Wesley Powell · 1875

Powell's original account of the first scientific expedition through the Grand Canyon, documenting the geology, natural history, and challenges of navigating the unknown Colorado River.

knowledge storytelling cultural context
The Secret Knowledge of Water

The Secret Knowledge of Water

Craig Childs · 2000

Craig Childs explores the hidden water sources and desert hydrology of the American Southwest, revealing how water shapes and sustains life in the most arid landscapes on Earth.

tone philosophy knowledge
Where the Old West Stayed Young

Where the Old West Stayed Young

John Rolfe Burroughs · 1962

A historical portrait of the ranching and outlaw culture of Browns Park and the remote canyons of the Colorado Plateau, illuminating how geography shaped the final stronghold of the old frontier.

cultural context storytelling knowledge
Upstream Island Park
Split Mountain
Downstream Split Mountain