Poopenaut Valley Trail

Overview

If you want solitude and river time—plus a leg-busting workout—this short but brutally steep out-and-back drops to the Tuolumne River below O’Shaughnessy Dam. It’s widely considered the steepest official trail in Yosemite, with grades that flirt with 40%. Expect a quiet, backcountry feel without going deep into the wilderness.

Distance, Elevation, and Time

Plan for roughly 2.5 miles round-trip and about 1,229 feet of elevation loss/gain. Despite the short mileage, most hikers take 3–4 hours because nearly all the elevation change happens in just over a mile. It’s straightforward: you plunge down first, then pay it back on the climb out.

What You’ll See

The descent threads a forest in fire recovery with occasional peeks toward O’Shaughnessy Dam, then eases onto the valley floor where a broad, often-soggy meadow meets the Tuolumne River. In spring, watch for wildflowers like lupine, buttercups, monkey flowers, and money flowers splashing color across the corridor. Wildlife sightings can include deer and the occasional black bear; birds work the meadow edges. Rattlesnakes are possible in warm months—step consciously. If you’re into fishing, river access here can be excellent (a valid California fishing license is required).

Trail Experience and Conditions

The path is narrow and can be overgrown, especially in spring. Long pants help against brush and poison oak. Expect uneven footing with loose dirt on steep pitches—trekking poles are worth their weight here. The meadow can be wet and buggy; waterproof footwear and insect repellent make the day better. Treat all river water.

Access and Parking

The signed trailhead sits about 4 miles past the Hetch Hetchy Entrance Station on Hetch Hetchy Road. Parking is extremely limited (think 2–3 cars) and there’s a bear box at the pullout. Hetch Hetchy Road operates on limited gate hours that vary by season and conditions—plan your start so you’re back at the car well before closing, and always verify current hours and any winter restrictions.

Regulations and Safety

No permit is needed for day hikes. Overnight trips require a wilderness permit, and proper bear-resistant food storage is mandatory. Pets aren’t allowed on this trail. This route is not accessible. Heat and dehydration are the biggest issues on the climb out—carry more water than you think you’ll need and start early.

Is It Worth It?

If you’re chasing giant vistas, this isn’t your trail—views are limited. But for a wild slice of the Tuolumne and true Yosemite solitude, it’s a gem. Strong hikers who like steep, raw trails and time by the river will love it; casual walkers should pick something gentler in Hetch Hetchy.