Skip to content
38.60473376227767°N 109.57364992324787°W
Colorado River — UT

The Portal

17 miles Class I–I 1 days
Flow Class I throughout. Runnable year-round; check the Moab gauge.
Season April-May and September-October are prime. Summer is hot; winter is possible.
Duration 1–2 days (typical 1)
Permit No permit required for river use. Day use free.
Shuttle 17 mi — 0.5 hrs
Logistics Route 279 / Potash Road paved shuttle end-to-end.
The Portal
Overview

17-mile Class I flatwater through The Portal — where the Colorado exits the Moab Valley through a narrow Wingate Sandstone cut. Route 279 on river-right delivers Wall Street climbing, Ancestral Puebloan petroglyphs, dinosaur tracks, and Corona Arch.

The 17-mile reach from the Moab Bridge (US-191) downstream to Potash Boat Ramp — where the Colorado River exits the Moab Valley through a dramatic narrow cut in the Wingate/Navajo escarpment called The Portal. In regional geology, 'the portal' is the opening through which the river enters or leaves a high-walled paradoxical valley, a rare geological phenomenon created by collapsed-salt-dome valleys like Moab's. Technically this reach is the upper end of Meander Canyon (which spans ~61.5 miles from The Portal to the Confluence); Desert Maritime treats it as its own section because of its distinct character: Class I flatwater pushed tightly against towering red-rock walls, with Route 279 (Potash Road) paralleling the right bank its entire length and delivering one of the highest concentrations of roadside rock climbing, petroglyphs, dinosaur tracks, and arch hikes anywhere in the American Southwest. Most river trips that pass through are on their way to Cataract Canyon; few paddle The Portal for its own sake, which is a shame because the walls here are the best you can see from a canoe anywhere on the Colorado above Lake Powell.

Trip styles
canoe overnight, paddleboard day trip, inflatable kayak day trip, motor raft positioning run, multi-day transit leg (part of Potash-to-North-Wash expeditions)
Ideal for
paddlers combining flatwater and canyon scenery, multi-day expedition groups (Potash launch or Portal-to-Confluence transit), photographers and climbers seeking a canoe-accessible climbing camp, car-campers staging multi-sport Moab trips
River type
flatwater, desert canyon, scenic corridor
17 miles
1 days typical

Flows & Hydrology

Reference Gauges

Colorado River near Moab, UT

USGS gauge on the Colorado River near Moab, UT — a key reference point for the Moab area river sections including Ruby-Horsethief, Westwater Canyon downstream flows, and upper Cataract Canyon planning. Located upstream of the Dolores River confluence.

Current flow — Colorado River near Moab, UT

Updating… Provisional

7-Day Forecast

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

The Portal is the textbook example of the 'portal' geologic feature — where a river exits a collapsed-salt-anticline valley through a resistant sandstone escarpment.

The Portal proper is the narrow geologic opening at the upstream end of the section where the Colorado exits the Moab Valley through a deep cut in the Wingate Sandstone escarpment. The Moab Valley itself is a collapsed-salt-anticline valley formed by dissolution of Paradox Formation salt thousands of feet below; as that salt dissolved and the overlying strata collapsed, it formed the 'paradoxical' valley (Moab Valley / Spanish Valley), and the river carved The Portal through the resistant sandstone escarpment that bounds the valley on the downstream side. Below The Portal, the Wingate Sandstone cliffs rise 500-900 feet directly from the river, with Kayenta Formation cap rock above, making this one of the most sheer-walled sections of the entire Colorado River.

Rock Record
Wingate Sandstone
Kayenta Formation
Navajo Sandstone
Entrada Sandstone
Province
Colorado Plateau
Rock types
sandstone
Ecology
History
Logistics
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
17River miles
Reading the River

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

Boatman's Quarterly Review Anthology

Boatman's Quarterly Review Anthology

Multiple Authors · 2000

A collection of essays and stories from the legendary Boatman's Quarterly Review publication, documenting the culture, lore, and voices of Grand Canyon river guides.

tone storytelling cultural context
Cadillac Desert

Cadillac Desert

Marc Reisner · 1986

A foundational book on Western water development, dams, irrigation politics, and the long struggle over the Colorado River and the arid American West.

knowledge philosophy cultural context
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
Cataract Canyon

Cataract Canyon

Robert H. Webb, Jayne Belnap, John S. Weisheit · 2007

An in-depth environmental and human history of Cataract Canyon and the rivers of Canyonlands, exploring Indigenous presence, exploration, dam impacts, river ecology, and the evolution of modern river running.

knowledge cultural context philosophy
Desert Solitaire

Desert Solitaire

Edward Abbey · 1968

Edward Abbey's classic portrait of canyon country, solitude, and wilderness, influential to the identity and mythology of the Colorado Plateau.

tone philosophy
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
House of Rain

House of Rain

Craig Childs · 2007

Craig Childs traces the routes of the ancient Anasazi across the Colorado Plateau, uncovering evidence of a lost civilization's migrations through canyon country.

storytelling cultural context philosophy
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
If We Had a Boat

If We Had a Boat

Roy Webb · 1986

A river-running memoir by Roy Webb capturing the spirit, humor, and culture of Western river expeditions and the people who chase moving water through canyon country.

tone storytelling cultural context
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 of Contraries

River of Contraries

Don Lago · 2010

A sweeping history of the Colorado River and its complex relationship with Western culture and landscape.

knowledge cultural context philosophy
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
Sunk Without a Sound

Sunk Without a Sound

Brad Dimock · 2001

The story of Norman Nevills and the birth of commercial river running in the Colorado River basin.

storytelling cultural context knowledge
The Canyon Country Zephyr Anthology

The Canyon Country Zephyr Anthology

Multiple Authors · 2010

A collection representing the voice, arguments, stories, and culture of canyon country, especially around Moab and the desert Southwest.

cultural context tone philosophy
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 Colorado River in Grand Canyon

The Colorado River in Grand Canyon

Larry Stevens, Tom Martin · 1987

A classic guide to the Colorado River through Grand Canyon with geology, ecology, and river running notes.

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 Emerald Mile

The Emerald Mile

Kevin Fedarko · 2013

The thrilling story of the dory daredevils who set a speed record through the Grand Canyon at the height of the legendary flood of 1983 — and of the river that made it possible.

tone storytelling knowledge cultural context
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 Last River Run

The Last River Run

Todd Balf · 2001

The story of the final free-flowing run of Glen Canyon before Lake Powell filled the canyon, capturing a vanished landscape and the culture it held.

storytelling philosophy cultural context
The Monkey Wrench Gang

The Monkey Wrench Gang

Edward Abbey · 1975

A gang of desert outlaws wage a reckless, irreverent war against the machines carving up the American Southwest.

tone philosophy 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
The Very Hard Way

The Very Hard Way

Brad Dimock · 2007

Brad Dimock's exhaustive biography of Bert Loper — gold prospector, early Colorado River boatman, and one of the great stubborn characters of Western river history — who died in Grand Canyon at 79, alone in his boat in a rapid, on the river he refused to leave. The definitive account of the Colorado River's pioneer running era.

storytelling knowledge cultural context
Westwater Lost and Found

Westwater Lost and Found

Mike Milligan · 2001

A story centered on the legendary Westwater Canyon stretch of the Colorado River, blending river-running culture, history, and storytelling from one of the most iconic whitewater sections in the Southwest.

storytelling cultural context
Upstream Jackass Canyon
Meander Canyon
Downstream Meander Canyon