Distance from Yosemite: 7 miles (11 km)
Trailhead Elevation: 4,000 feet (1,220 meters)
Elevation Gain: 300 feet (90 meters)
Missing Bridge Alert: The Red Rock Falls hike crosses the creek shortly after it starts. There was once a bridge here, but it's been awaiting replacement since 2015, with NEPA approval apparently being the holdup. In the meantime, a log crossing with a rope handhold just downstream from the trail should suffice for nominally spry hikers. Progress on the new bridge is supposed to get reported on the Sierra National Forest's SOPA page.
Note that this only applies to the Red Rock trail; the Corlieu Falls trail is still intact.
Why hike the Lewis Creek trail? Not all of Yosemite's greatest sights are in ... well, Yosemite. Visit the waterfalls on this trail and you'll be wondering why the park's founders didn't draw the border another seven miles south to include them.
Crowd Factor: This hike has grown more popular in recent years, but misanthropes will still prefer Lewis Creek over any of the waterfall hikes in Yosemite Valley.
Scenery Factor: The two waterfalls bookending this trail make it a memorable trip. Corlieu Falls, downstream from the trailhead, is an 80 foot (25 meter) series of cascades in a narrow canyon. Red Rock Falls is much shorter, at about 20 feet (6 meters), but compensates in width and concentration of power. The trail to Red Rock Falls is also pleasant in a daydreamy-stroll-beside-a-stream sort of way. It proceeds beside Lewis Creek, which is framed by ferns and mossy rocks, and the trail itself is lined with evergreens and dogwoods. The shady environment produced by the timber and the canyon through which the creek flows give this hike a northwestern flavor, especially in the spring.
Difficulty: These hikes straddle the easy/medium boundary. Both involve some elevation change, and it's especially concentrated on the Corlieu Falls trail, where you'll have a short but lung-straining walk up a steep trail to get back from the falls. Still, the route is much improved; the Forest Service has built a viewing platform and put lots of work into the trail. If you're familiar with the pre-2010 Corlieu Falls hike and remember the perilous scramble down the slope to see the falls, the changes will impress you. It's now possible to catch an excellent view of the falls without incurring any injuries at all.
Best Time to Visit: In the spring, when there's lots of water going over the falls and wildflowers are blooming along the trail.
Driving Directions: The Lewis Creek trailhead is located on highway 41, seven miles (11 km) south of Yosemite's southern entrance, and 7.5 miles (12 km) north of the intersection of highways 41 and 49 in Oakhurst. Here's a Google Street View panorama of the trailhead parking area.
A hundred meters or so from the trailhead, the trail forks. Go left (upstream) to Red Rock Falls or right (downstream) to Corlieu Falls.
Parking: Lot at the trailhead that holds a dozen or so cars
Hazards: It's the familiar Sierra formula: water = mosquitoes. Bring your repellent. There are also patches of poison oak along the Corlieu Falls section of the trail.
Dog Friendly: Dogs aren't allowed on most of the trails inside Yosemite, but they're welcome on national forest trails like Lewis Creek, provided you keep them leashed.
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