Overview

Jumbo Springs is small (4,631 acres) wilderness area, measuring only 3.5 miles long and 1.5 miles wide. What it lacks in size, it makes up for in that it is located in a remote, sparsely-vegetated, rugged region of granitic ridges and canyons on the far east end of Lake Mead. The area sits on the southeast side of Jumbo Peak, uphill from the boundary of Lake Mead National Recreation Area. Three major washes cut across the wilderness area, draining east and south towards the lake. Elevations range from 4,700 feet on a ridge in the northwest side, to washes at about 2,700 feet along the southeast side of the area. The area offers grand views of Lake Mead and the lower reaches of the Grand Canyon. Water can be found in springs and in the granite, water-polished potholes in Cottonwood Spring.

If you hike in wilderness areas, help protect them by learning about and reporting noxious and invasive weeds.

Link to map of the wilderness area.
Link to hikes in the wilderness area.

Location

The Jumbo Springs Wilderness Area is located about 55 air-miles east of Las Vegas, out in the Gold Butte region north of Lake Mead and east of the Overton Arm.

Boundaries

The eastern boundary is coincident with the boundary of Lake Mead National Recreation Area. The southern boundary is coincident with a narrow strip of Bureau of Reclamation land (a 1-mile-wide band of land that runs along the boundary of Lake Mead). The western and northern boundaries follow peak-to-peak lines and ridges. I'm can't tell from available maps exactly where the western and northern boundaries run, but the wilderness area is about 1-mile wide at the southern end and about 2-miles wide at the northern end. The eastern part of the northern boundary runs along a section line.

Access

Access is from the Devils Cove road (rough dirt) that runs near the eastern boundary of the wilderness area. A short spur road leads to a parking area at the base of Cottonwood Canyon.

Terrain

The wilderness area is located on the southeast flanks of Jumbo Peak and includes the upper canyons of three major washes that drain toward Lake Mead. Elevations range from 2,700 feet along the southern boundary to the 4,700-foot ridge on the northern end. The area includes sparsely vegetated granitic ridges and canyons that overlook the eastern end of Lake Mead. There are granitic domes and smooth cliffs along the ridge tops, and the side slopes are strewn with coarse-grained granitic boulders and deeply cut by canyons.

Habitat Type

The side slopes are rocky and sparsely vegetated with a fair variety of Mojave Desert Scrub species that include creosote bush, catclaw acacia, Mojave yucca, Nevada jointfir, buckwheat, a few cacti (e.g., Beavertail and mound cactus), and in some places, even cryptobiotic crusts. There are lots of barrel cactus on the more rocky slopes. In Cottonwood Canyon, the dominant shrubs include rabbitbrush, catclaw acacia, desert willow, honey mesquite, and buckhorn cholla. Above one waterfall, there is enough water to support cattail and bulrush, and unfortunately, there is a fair bit of saltcedar too.

Wildlife

Mammals include desert bighorn sheep, coyote, and black-tailed jackrabbits, burros or horses (droppings), desert woodrats, white-tailed antelope squirrels, and pocket gophers. Reptiles include desert tortoise and side-blotched lizards. Birds include Red-Tailed Hawk, Cooper's Hawk, Golden Eagle, Gambel's Quail, Greater Roadrunner, White-crowned Sparrow, and Black-throated Sparrows.

Archaeology

No information, but there is water here, so there probably were people here too.

Geology

The geology of the general area is complex, with a variety of oddly juxtaposed rock types. In the wilderness area, all of the rocks are old and date to Precambrian times. The lower strata is Precambrian metamorphic, but this is overlain by what seem be regular, coarse-grained granitic rocks. There are granitic domes and smooth cliffs along the ridge tops, and the side slopes are strewn with coarse-grained granitic boulders and deeply cut by canyons. Just across the road to the east, the rocks are carbonates with dates starting in the Cambrian. On some of the water-polished granite waterfalls, there are carbonate flowstone-like deposits, but I don't know what the source of the carbonates would be on this side of the canyon; maybe it isn't carbonate.