Paddling in Big Bend National Park

Big Bend National Park sits in the far southwestern corner of Texas, where the Rio Grande carves the boundary between the United States and Mexico through some of the most remote desert terrain in North America.

The paddling here is almost entirely river paddling — moving water through deep limestone canyons and open desert stretches — and the Rio Grande is the only water that matters. Four canyon runs define the park's paddling.

Santa Elena Canyon is the most accessible, a popular day or overnight trip where the river cuts through walls that rise 1,500 feet above the water. Rapids reach Class IV in higher flows, but the canyon also holds long calm stretches.

When the Johnson's Ranch gauge reads above 2,000 cfs, open canoes must carry 50 percent flotation and decked boats require spray skirts; Type II collar-style PFDs are not permitted here at any level.

Mariscal Canyon, at 10 miles the shortest of the runs, is wilder and less visited. Gas-powered motors are prohibited there except during October.

Boquillas Canyon stretches 33 miles and runs more gently — a better fit for paddlers with less river experience, and a multi-day float through open country where you may go days without seeing another boat.

The Lower Canyons require five to ten days and deliver the most remote experience in the park, a mix of open desert and deep canyon that sees far fewer parties than the reaches upstream. The Rio Grande here is an international boundary.

The deepest channel marks the line, and a trip through any of these canyons will cross it repeatedly.

Landing on the Mexican bank is an illegal entry and can result in fines or detention; the narrow exceptions are safety-driven — bailing a boat, scouting a rapid, or getting out of the sun when overheating.

Passports are not currently required to float the river, but that status can change. A Backcountry Use Permit is required for both day and overnight trips on all sections of the Rio Grande within the park; the NPS issues it.

Multi-day permits carry a fee; day permits do not. Private group sizes are capped at 30 people on most sections, and at 20 people on the Talley-to-Solis stretch, through Boquillas Canyon, and in the Lower Canyons.

Groups larger than the launch limit must split their start by at least one day. Low water is the norm more often than not. Recent decades have run dry enough that rafts are sometimes impractical, and canoes or kayaks become the right call.

Check the gauge before you go, and build your gear choices around what the river is actually doing.

Out here, the logistics are real, the distances are long, and the nearest help is far away — which is exactly what makes the Rio Grande through Big Bend worth the effort.