Hot Spring
Hot Spring flows at 78 degrees within Lake Mead National Recreation Area at 670 feet elevation, barely exceeding the 75.3-degree ambient temperature by 2.7 degrees. Recent USGS analysis documented pH 7.6 and chemistry with 160 mg/L sodium, 180 mg/L sulfate, and 180 mg/L chloride, reflecting desert mineral concentrations.
The spring emerges in Mojave Desert terrain near Boulder City, where Lake Mead's reservoir landscape creates dramatic topographic relief. At remarkably low elevation for a Nevada thermal feature, the site sits in country receiving just 5.4 inches of annual precipitation and 0.3 inches of snow. National Park Service management under protection status 2 preserves the spring while allowing recreational access. The approach crosses 2.2 miles of desert requiring substantial hiking through terrain exposed to summer temperatures routinely exceeding 110 degrees.
The 1980 NOAA survey and subsequent USGS water sampling provide the primary documentation. Lake Mead National Recreation Area, established in 1964, encompassed existing thermal features including this spring. Whether earlier inhabitants used this lukewarm water source in an area with limited alternatives remains undocumented in accessible records. The spring's minimal temperature differential suggests limited historical appeal for thermal bathing.
Hike only during October through April; summer heat presents serious danger in this exposed terrain. The 2.2-mile one-way distance requires 4-5 hours round-trip with adequate water, navigation equipment, and sun protection. The lukewarm 78-degree temperature provides minimal thermal experience. Boulder City offers full services and lodging. This excursion suits experienced desert hikers interested in geothermal features rather than bathing. National Park Service regulations govern all activity within Lake Mead NRA.
The water at Hot Spring is slightly alkaline (pH 7.6). It is notably rich in chloride (natural antiseptic with skin health benefits).