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38.2083°N 109.8886°W
Colorado River • Canyonlands National Park

Cataract Canyon

Two rivers merge beneath a billion years of rock. Then the canyon gets serious.

41 miles from the Confluence 14 miles of major rapids Class II-V depending on flow and line Usually 4-5 days for standard raft itineraries
Flow Potash on the Colorado and Mineral Bottom on the Green sit at the two put-ins...
Season Late spring snowmelt delivers the iconic Cataract — massive waves, fast water,...
Duration 2–7 days (typical 4)
Permit All trips require a Canyonlands river permit through Recreation.gov. No lottery...
Shuttle 215 mi — 5.5 hrs
Logistics A committing point-to-point expedition with a 215-mile shuttle, no cell service,...

Two rivers merge beneath a billion years of rock. Then the canyon gets serious.

Cataract Canyon
Overview

Cataract is two trips joined by a confluence. The first is a long, wind-bitten flatwater approach — forty miles of meander below Potash where the canyon walls climb and the current slows and you begin to understand that the Colorado takes its time before it gets violent. The second begins just past Spanish Bottom, where the Green River arrives from the north and the combined discharge enters a fourteen-mile rapid corridor that produces some of the largest standing waves on any commercially run river in North America. The Big Drops arrive in sequence — three of them in less than a mile — and at high water, the hydraulics aren’t puzzles to solve. They’re physics you survive. Below them, the canyon tells a different story: reservoir sedimentation, re-emerging rapids, and a take-out that shifts with Lake Powell’s elevation like a shoreline that can’t make up its mind.

Cataract Canyon begins where two rivers stop being separate. At the Confluence, the Green slides in from the north and doubles the Colorado’s volume in a quarter mile — and for the next fourteen miles, the combined river drops through a canyon it carved by being older than the mountains that tried to rise around it. The long flatwater approach from Potash teaches patience; the Big Drops teach physics. Below them, the lower canyon tells a more recent story — of reservoir sedimentation, re-emerging rapids, and a landscape still negotiating its relationship with Glen Canyon Dam. This is not a casual float. It is a committing, weather-exposed, logistically serious expedition through one of the most consequential stretches of whitewater in the American West.

Trip styles
multi-day raft expedition, motor-rig supported expedition, oar rig, paddle raft, expert kayak run, packraft traverse at select flows
Ideal for
experienced private raft groups, commercial whitewater expeditions, big-water boaters, desert river photographers, Canyonlands-focused adventure travelers
River type
desert river, canyon river, expedition section, permit river, big water
41 miles
4 days typical
35 named rapids
6 camps

Flows & Hydrology

Runoff is the variable that makes Cataract a different river from month to month. The park’s historic flow framework combines the Colorado near Cisco with the Green River gauge to estimate what the confluence will produce — and the range is enormous. At 4,000 cfs the rapids are technical and rocky, line-dependent, slower than you’d expect. At 25,000 the same features become powerful, pushy wave trains with real lateral force. Above 40,000 the canyon transforms into a true big-water venue: massive holes, breaking laterals, exploding pillow waves, and recovery windows measured in seconds. The same rapid that felt manageable last week can flip a fully loaded eighteen-foot raft this week. That’s not hyperbole. That’s what stream power means when sediment load, channel constriction, and gradient conspire in a confined space.

Reference Gauges

Colorado River at Potash, UT

USGS gauge measuring discharge and gage height on the Colorado River at Potash, UT — downstream of the Moab valley and upstream of Cataract Canyon. Combined Cisco + Green River flows pass this point, making it the most direct pre-Cataract flow reading.

Current flow — Colorado River at Potash, UT

Updating… Provisional

Launch-day Colorado-side reading at the Potash put-in. Sum with Mineral Bottom for the combined flow that reaches the Big Drops.

Green River at Mineral Bottom, UT

USGS gauge measuring discharge and gage height on the Green River at Mineral Bottom, near the Canyonlands National Park boundary. Sits at the take-out for Labyrinth Canyon and the put-in for Stillwater Canyon — the Green-side launch point for Cataract Canyon trips. Reads the Green's contribution to the Confluence at the actual put-in.

Current flow — Green River at Mineral Bottom, UT

Updating… Provisional

Launch-day Green-side reading at the Mineral Bottom put-in. Sum with Potash for the combined flow that reaches the Big Drops.

Colorado River at Gypsum Canyon, UT

USGS gauge measuring discharge on the Colorado River at the mouth of Gypsum Canyon, near Hite — below the Big Drops sequence and in the reservoir-influenced lower miles of Cataract Canyon. Reads the combined Colorado + Green flow after the Confluence and after the Cataract whitewater corridor.

Current flow — Colorado River at Gypsum Canyon, UT

Updating… Provisional

Post-Big-Drops single-gauge reading of the combined Confluence flow. Useful for take-out conditions at Hite / North Wash and for tracking reservoir-effect changes as Lake Powell rises and falls. Thinner historical data than the upstream gauges (newer station).

Cataract has two operational gauge layers. **Launch-day combined flow (what's actually in the canyon):** Potash + Mineral Bottom, summed — these sit at the two put-ins above the Confluence; their sum is what reaches the Big Drops. **Post-Big-Drops (what's running through the lower canyon):** Gypsum Canyon, a single gauge below the Big Drops; reads the combined flow naturally but has thinner historical data. The Recommended Flow Ranges chart below uses the combined Potash + Mineral Bottom reading. For multi-day forecasting (what's coming downstream), see the upstream gauges on the Colorado and Green River overview pages.

7-Day Forecast

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

Best known for late-spring and early-summer snowmelt, with character shifting from rocky low-water whitewater to large, dynamic big-water conditions.

Spring
Cold water during runoff, Rapidly rising flows, Large, consequential holes and lateral waves, Wind on the approach miles
Summer
Extreme heat exposure, Monsoon wind and lightning, Flash-flood potential in side canyons, Reservoir headwinds and slower lower-canyon travel
Fall
Lower water and rockier line choices, Cold nights, Longer flatwater feel, Take-out uncertainty tied to lake level
Winter
Very cold weather and water, Limited rescue margin, Road access complications, Short days and hypothermia exposure
Recommended Flow Ranges

Combined Potash + Mineral Bottom reading — the two launch-zone gauges, summed. Equivalent post-Big-Drops reading available on the Gypsum Canyon gauge, which has thinner historical data.

5,000–10,000 cfs Technical low water

Class III character with technical, rocky lines through the Big Drops. Pool-drop sequencing dominates; the long flatwater approach drags. Best for boulder-garden navigation and skill development.

10,000–20,000 cfs Classic moderate

The sweet spot for experienced self-guided crews. Big Drops are powerful but scout-and-run with clean lines. Sandy beaches above water; hydraulics are well-defined and readable.

20,000–35,000 cfs Big-water Class IV

Big-water Class IV. Hydraulics intensify, the sequence feels compressed, and pool recovery shrinks. Rewarding for crews with prior big-water experience; not a first run. (Class V territory begins at flood-stage flows above ~50,000 cfs.)

35,000–50,000 cfs Serious big water

Pools start to wash out and beaches flood. Many groups portage Big Drop 3 along the right shore. Expedition-grade above 50,000 cfs — commercial outfits shift tactics or cancel; private trips at that level only with a deep big-water resume.

Geology

You are floating through the autobiography of the Colorado Plateau. The canyon exposes a stratigraphic column that begins with Pennsylvanian-age Honaker Trail Formation — marine limestones laid down 300 million years ago when this desert was a shallow sea — and rises through the Lower Cutler beds, the Moenkopi, the Chinle, and into the great Mesozoic sandstone sequence that gives Canyonlands its architecture. The rapids themselves are geological events: debris fans delivered from tributary canyons, constriction points where resistant rock units narrow the channel, and boulder fields created by canyon-wall collapse. At the Confluence, you can see the structural story clearly — the Meander Anticline flexing the Honaker Trail beds, salt tectonics from the Paradox Basin deforming rock that was deposited before the first dinosaur walked. The river is older than the uplift. It carved downward as the plateau rose, maintaining its course through sheer persistence — what geologists call antecedent drainage. The canyon is the proof.

The canyon is a cross-section through 300 million years of deposition, uplift, and erosion. At river level, the Honaker Trail Formation records a Pennsylvanian-age shallow sea; above it, the Lower Cutler beds mark the transition to terrestrial red-bed deposition as the sea retreated. The Moenkopi, Chinle, and the great Mesozoic eolian sandstones — Wingate, Kayenta, Navajo — build the skyline. Rapids form where tributary debris fans constrict the channel, where resistant rock units create gradient breaks, and where canyon-wall collapse delivers boulders faster than the river can move them. The Meander Anticline near the Confluence exposes Paradox Basin salt tectonics — subsurface salt movement that has been deforming overlying strata since the Permian. The river itself is an antecedent stream: it established its course before the Laramide orogeny lifted the plateau, and carved downward as the land rose around it. The canyon is the evidence of that persistence.

Rock Record
Honaker Trail Formation
Lower Cutler beds
Moenkopi Formation
Chinle Formation
Wingate Sandstone
Kayenta Formation
Navajo Sandstone
Province
Colorado Plateau
Rock types
sandstone · siltstone · shale · limestone · conglomeratic debris · alluvium
Landforms
incised meanders · sheer cliff walls · tributary side canyons · talus fans · debris-fan rapids · alluvial benches · alcoves · reservoir sediment terraces · Tilted Park
Ecology

The riparian corridor here is a biological thread through otherwise bare rock. Tamarisk and willow crowd the banks where sediment has accumulated; cottonwood groves mark the rare points where groundwater reaches the surface. Side canyons concentrate the life — seep-fed hanging gardens, maidenhair fern clinging to alcove walls, desert varnish streaking the Wingate above. Bighorn sheep work the ledges and talus. Golden eagles and peregrines hunt the thermals. Great blue herons stand in the shallows below camp, unbothered. But the ecology is also a story about disturbance. Tamarisk is invasive and persistent. Flash floods reshape beach habitat on a storm-by-storm basis. The dam upstream altered the river’s sediment regime — the pre-dam Colorado carried 380,000 tons of sediment per day past this point; the post-dam river carries a fraction of that. Camps that existed before Lake Powell’s maximum pool were buried. Some are re-emerging now. The humpback chub — endemic to the Colorado system, adapted to the warm, silty, violent river that no longer exists — persists here in one of its last remaining strongholds.

History

People have been in this canyon for more than ten thousand years. Ancestral Puebloan granaries and rock art mark the alcoves. Fremont-culture sites appear in the side canyons. Ute and Paiute peoples — whose cultural continuity with earlier inhabitants is documented but often overlooked — used the river corridor seasonally and knew it intimately long before Powell arrived in 1869 half-starved and terrified, gave the rapids numbers instead of names, and wrote about them in language that mixed genuine awe with Victorian expedition bravado. Bert Loper spent decades trying to get back to this canyon. He died at 79, running a rapid in Grand Canyon, still committed to the river as a life’s work rather than a vacation. In 1983, an uncontrolled release from Glen Canyon Dam sent floodwater downstream and reminded everyone that the Colorado is older than the infrastructure built to contain it. Kevin Fedarko’s account of the speed run through Grand Canyon during that flood — the crew of the Emerald Mile pushing a wooden dory through water no one had seen in a generation — captures something essential about this river: it rewards obsession and punishes overconfidence in equal measure. The lower canyon adds a more recent chapter. Lake Powell’s rise buried rapids that boatmen had run for decades. Its decline is exposing them again — along with sediment terraces, re-emerging shorelines, and the physical evidence of what Marc Reisner called the West’s most ambitious experiment in rearranging nature.

Logistics

Cataract planning rewards the methodical and punishes the optimistic. The shuttle alone — Potash to North Wash — is 215 miles of highway and remote desert road that takes five to six hours in good conditions and can take longer when weather, road damage, or reservoir access complications intervene. Most parties launch from Potash; Mineral Bottom and Green River State Park are standard alternatives that add approach miles but change the trip’s character. The take-out question is never fully settled until you get there. North Wash and the Dirty Devil confluence are the common options, but usability shifts with lake elevation, road conditions, mussel-inspection requirements, and seasonal closures. Professional shuttle support is the norm, not the exception. Satellite communication is essential. Self-support groups without motors should plan conservatively — wind on the approach and lower canyon can cost you an entire day.

Gear

Cataract demands expedition-grade systems. This is not a trip where you find out what you forgot — it’s a trip where forgetting the wrong thing becomes consequential by mile forty. Most parties rig fully self-contained oar rigs with overnight frames, strapped loads, and whitewater-rated dry storage. Rescue capacity is non-negotiable: throw bags, pin kits, spare oars, and at least one person in the group who has practiced the skills rather than just packed the equipment. Sun protection matters more than people expect — reflected UV off water and sandstone compounds the exposure. Cold-water preparedness matters more than the air temperature suggests — spring runoff can be in the forties, and a swim in the Big Drops is not a thirty-second inconvenience. Motors are common and defensible. The flatwater approach and lower-canyon headwinds can consume days for oar-only groups. The question isn’t whether motors are ‘cheating’ — it’s whether your group has a realistic plan for making thirty miles of flatwater and reservoir travel without them.

The section rewards expedition-grade systems over minimalist packing. Even expert kayakers generally rely on strong group support. Raft crews should prioritize spare rigging, frame integrity, rescue systems, and realistic contingency planning for flips, lost time, wind, and changing take-out conditions.

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
41River miles
35Named rapids
6Established camps
4Hikes & side canyons
Gallery
Reading the River

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

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
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
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 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
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
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
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
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
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
Field Sources

Evidence behind the claims on this page — agency rules, maps, gauges, books, and field notes.

Permits

Rapids

Geology

History

  • book The Exploration of the Colorado River — John Wesley Powell (1875)
  • book-excerpt Cataract Canyon (Webb / Belnap / Weisheit) — Selected Pages — University of Utah Press (2007)
  • book Cataract Canyon — Robert H. Webb, Jayne Belnap, John S. Weisheit (2007)

Management

Field notes

  • field-note Jon Koenig — Cataract Canyon 2003 Notebook — Jon Koenig (2003) ·

Books

Logistics

  • field-note Desert Maritime — River Packing System Notes — Desert Maritime ·

Safety

  • book-excerpt Cataract Canyon (Webb / Belnap / Weisheit) — Selected Pages — University of Utah Press (2007)
Meander Canyon
Upstream Meander Canyon
Downstream Narrow Canyon