San Juan River Rafting: Complete Utah Planning Guide

The San Juan River cuts through the Colorado Plateau in southeastern Utah, carving deep canyon walls through layers of sandstone, shale, and ancient marine sediment. It doesn't have the big-water reputation of Cataract Canyon or the technical challenge of Westwater, but the San Juan offers something those rivers don't — an accessible multi-day float through a canyon rich with cultural history, wild geology, and genuine solitude. This is one of the most rewarding desert river trips in the Southwest for paddlers of all experience levels.

The Route: Mexican Hat to Clay Hills

The classic San Juan trip runs from Sand Island near Bluff (the most common put-in) or Mexican Hat to the Clay Hills Crossing takeout, a total of roughly 84 miles. Most groups start at Sand Island to catch the full stretch of canyon, but Mexican Hat is a convenient shortcut that cuts about 26 miles off the trip.

Put-in: Sand Island Campground, near Bluff, Utah (most common) or Mexican Hat, Utah. Take-out: Clay Hills Crossing, north of Mexican Hat on Lake Powell's arm. Distance: 84 miles (Sand Island) or ~58 miles (Mexican Hat). Difficulty: Class I–II. Several riffles and wave trains, no serious rapids. Trip length: 4–5 days from Mexican Hat; 5–7 days from Sand Island.

The river moves steadily through increasingly narrow canyon walls. By the time you reach the Goosenecks section — a series of dramatic entrenched meanders just downstream of Mexican Hat — the walls rise 1,000 feet above the river on a canyon floor barely wider than the river itself.

Goosenecks and the Canyon Geology

The Goosenecks of the San Juan River are one of the most dramatic examples of entrenched meanders in the world. The river, once meandering across a flat plain, was gradually uplifted by tectonic forces while continuing to carve downward — the meanders became locked in stone. From the rim, the Goosenecks look like a series of horseshoe bends stacked inside each other. From the river, you float through them over several hours, the canyon wrapping around you in slow arcs.

The exposed rock layers tell 300 million years of geological history. Look for the contact between the Honaker Trail Formation (gray marine limestone) and the overlying Pennsylvanian-age rocks — this section of canyon is a textbook geology field trip.

Cultural History

The San Juan corridor is part of the ancestral homeland of multiple Indigenous peoples. You'll pass rock art panels — petroglyphs and pictographs — etched and painted by Ancestral Puebloans between roughly 500 and 1300 CE. The Navajo Nation borders much of the river's south bank.

Key sites:

• Sand Island Petroglyph Panel: An extensive rock art panel just downstream of the Sand Island put-in.
• River House Ruin: A well-preserved Ancestral Puebloan structure visible from the river, around mile 38 from Sand Island.
• Butler Wash: Several side canyon hikes lead to additional ruins and panels.

Stay on the river corridor. Do not enter, climb, or disturb any cultural sites. Federal and tribal laws protect all cultural resources.

Permits

Every San Juan float between Montezuma Creek and Clay Hills needs a BLM permit, year-round — there's no day-trip exemption. The BLM Monticello Field Office runs it, and you book it on recreation.gov (permit #250986). Allocation is a hybrid keyed to your launch date:

• Spring launches (mid-April through mid-July): a pre-season lottery. Apply in the winter window (apply in January; confirm the exact 2026 application dates and results timing on recreation.gov before you build a trip around them). Leftover dates open to first-come advance reservation after the draw.

• Other launches: advance reservation. Winter and fall launch windows are booked first-come on recreation.gov when their reservation window opens — no lottery.

• Group size: 25 people maximum per permit.

• Cost: a per-person segment fee plus a non-refundable recreation.gov fee; confirm current rates at booking.

• Launch and camps: your permit specifies your put-in date; below Government Rapid the lower canyon uses nine designated campsites reserved in advance through recreation.gov for Clay Hills trips.

Spring is the competitive season — get your lottery application in during the winter window. Fall launches are far easier to land on advance reservation.

Flow Levels

Check the USGS gauge at Bluff, Utah (09379500) before your trip. The practical minimum for a loaded raft is around 500 CFS; the river runs best around 1,000–5,000 CFS.

• Below 500 CFS: Expect dragging in shallow sections — marginal for loaded rafts (canoes and packrafts fare better).
• 500–1,000 CFS: Floatable but low and slow.
• 1,000–5,000 CFS: The river's prime range — steady current, clean riffles, easy navigation.
• Above 5,000 CFS: Fast water, some wave trains — fun and straightforward for experienced paddlers.

Spring snowmelt from the San Juan Mountains typically peaks flows in May and early June.

Camping and Logistics

Campsites on the San Juan are sandy beaches and gravel bars. There are no designated sites — you camp wherever you find a suitable beach above the high-water mark. Popular spots cluster near side canyon hikes.

Water: River water must be filtered. The San Juan runs silty — use a gravity filter or let water settle before filtering. Waste: A groover (portable toilet) is mandatory for all trips. Pack out all human waste. Fire: Campfires allowed in a fire pan with ash carried out. Wood collection is not permitted in the canyon.

Shuttle options: Clay Hills takeout is a long drive from the put-ins. Commercial shuttles operate from Bluff and Mexican Hat. Expect $150–250 for a full shuttle. Two-vehicle shuttles work but involve significant driving on dirt roads near Clay Hills — high-clearance vehicles recommended.