River Mountains Loop Trail

The River Mountains Loop Trail is a roughly 34.4-mile paved, nonmotorized circuit around the River Mountains, linking Lake Mead, Boulder City, Henderson and the Las Vegas Valley. There is no required start. The saved route begins at the Alan Bible Visitor Center access and follows the full loop back to that area. The Historic Railroad Trail and its tunnels connect nearby as a separate spur; they are not part of this mileage. This is a regional route crossing several jurisdictions, so access, rules and facilities vary along the way.

The full circuit is most practical as a long-distance cycling route or as several shorter outings. Walking every mile is an all-day undertaking; about 13 hours is a rough walking estimate for the full loop, based on the park’s shorter in-park timing and the mapped distance. The 16.2-mile one-way Lake Mead section has a 4–8 hour estimate; that range is for the in-park portion, not the whole circuit. Multiple trailheads make it easy to choose a shorter segment instead. The loop has broad elevation changes and a few short steep sections, so plan for more than a flat urban path even though much of it is paved.

Within Lake Mead National Recreation Area, the route covers 16.2 miles one way. This portion is described as easy, with a 750-foot elevation change. It gives access to several trailheads, including the Alan Bible Visitor Center area, Boulder Harbor and the Lake Mead Parkway fee station. Views of the lake, open Mojave terrain and surrounding mountain ridges are recurring highlights. The route is shared with cyclists and other nonmotorized users; expect to watch for faster riders and check road crossings where the trail meets local streets.

The River Mountains are volcanic, and the loop passes through a landscape shaped by old lava flows. Lava Butte is visible from roughly mile markers 12 to 14, a good stretch to pause and pick out the low volcanic cone beside the broader ridges. The area’s volcanic flows formed about 12–15 million years ago. The route’s changing elevation opens different views across Lake Mead and the desert rather than staying beside the water for the full circuit.

Carry enough water for the segment you choose; refill points are not spread evenly along the loop. The visitor center area and Boulder Harbor have water and restrooms, while the Lake Mead Parkway fee-station access has a pit toilet but no water. The lower lot near Alan Bible is shared with the Historic Railroad Trail and can fill on weekends. Vehicle admission fees apply to the Lake Mead National Recreation Area portion. Dogs are allowed on the park section on a leash no longer than six feet; keep them leashed and check local rules through the other jurisdictions. Bring food and sun protection, especially for a long ride or walk in warm weather.

The trail was planned as a connected route across public lands and local communities, rather than a single park path. Planning began in 1996, a multi-agency advisory council formed the following year, and the complete loop opened in 2012 after earlier sections were dedicated in 2000 and 2001. That shared history explains why the trail links several recreation areas and towns and why users should check the access and facility details for their chosen section before setting out.