Hot Spring

Clark County, Arizona · Near Boulder City
35.9840°N, 114.7420°W · 700 ft
Hot 77°F air · Good soaking weather 700 ft Open Hike National Park Service

An entry called only Hot Spring, in Clark County on the Lake Mead National Recreation Area, with Boulder City the nearest town and no distance between them on file. The record flags the water as hot but holds no measured temperature, so the heat is a label without a figure. A 2019 sample shows alkaline water heavy in dissolved solids. Access is open. The National Park Service owns the ground.

Location
61 miles from Bullhead City, AZ

Count on hiking a bit over a mile in; the road you start from is unnamed. The spring sits low, around seven hundred feet, in desert that gets about six inches of rain and no snow at all. The annual mean is in the mid seventies. The land is National Park Service, part of the recreation area around Lake Mead. No campground is named.

The record suggests no season. The approach is a hike of a little over a mile. Access is open on Park Service land. No campground, nothing on fees. Nobody measured the temperature, only labeled it hot, and the 2019 chemistry shows heavily mineralized water, so expect heat and take it carefully.

Terrain

Aircraft with laser scanners measured this ground to within inches. The scan strips out trees and buildings, leaving the bare shape of the land around Hot Spring.

Aerial view of the ground around Hot Spring LiDAR bare-earth view of the same ground around Hot Spring
Aerial LiDAR bare earth

Drag the handle to compare the two views. The orange dot marks the spring, in a frame about three quarters of a mile wide.

Setting
Canyon floor
Steep ground climbs away on both sides of the spring.
Highest ground nearby
616 ft above the spring
Within a quarter mile, to the northeast
Cross-section through the spring

A slice through the ground from southwest to northeast, about 0.6 miles end to end.

Elevation data: USGS 3D Elevation Program. Aerial imagery: USGS The National Map. Public domain.

Heat Below
106 milliwatts per square meter of heat flow

That's about 1½ times the US average of 65. It's higher than at 56% of the springs on this site.

Heat flow measures the warmth working its way up through the ground from deep inside the earth. Where it runs high, rain and snowmelt that seep down through cracks in the rock come back up hot.

Heat flow estimate: Stanford Thermal Earth Model (Aljubran & Horne, 2024), CC BY 4.0.

Monthly Climate
54°
Jan
57°
Feb
65°
Mar
73°
Apr
82°
May
93°
Jun
98°
Jul
97°
Aug
89°
Sep
76°
Oct
62°
Nov
53°
Dec
Annual Precip: 6.0 in Annual Snow: 0.4 in
Current Conditions
77°F
Clear W 20.9 mph 28% Good soaking weather
Today 100° Low 84° Sunny 1% precip
Wednesday 98° Low 81° Sunny 1% precip
Thursday 99° Low 77° Sunny 2% precip
Friday 100° Low 76° Sunny
Saturday 100° Low 77° Sunny 1% precip
Water Chemistry Sampled 2019-05-13

The water at Hot Spring is slightly alkaline (pH 8.2) with 2790 mg/L total dissolved solids. It is notably rich in calcium (may support bone density and joint health), sodium (supports circulation and skin hydration), and sulfate (traditionally used for skin conditions and inflammation).

pH 8.2 Slightly Alkaline
pH influences mineral absorption through skin
Higher mineral concentration for therapeutic soaking
Calcium 247 mg/L
May support bone density and joint health
Magnesium 3 mg/L
Known for muscle relaxation and stress relief
Sodium 654 mg/L
Supports circulation and skin hydration
Sulfate 844 mg/L
Traditionally used for skin conditions and inflammation
Chloride 869 mg/L
Natural antiseptic with skin health benefits
Where to Stay

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Temperature
Hot
Warm Hot Boiling
Avg Air Temp 75°F
Access
Open
Road Access Hike
Distance to Road 1.3 mi
Land
Ownership Federal
Agency National Park Service
Designation National Recreation Area
Unit Lake Mead National Recreation Area
Manager National Park Service
Protection 2 - Permanent protection, some use allowed
Frequently Asked Questions
What is the water temperature at Hot Spring?
Hot Spring is classified as hot. An exact temperature measurement has not been recorded.
Where is Hot Spring located?
Hot Spring is located in Clark County, Arizona at 700 feet elevation, near Boulder City. Coordinates: 35.9840°N, 114.7420°W.
How do I get to Hot Spring?
Hot Spring has Hike road access (1.3 mi from the road).
Is Hot Spring free to visit?
Hot Spring has Open access. It is managed by National Park Service.
What minerals are in the water at Hot Spring?
Water chemistry analysis shows the presence of pH, Total Dissolved Solids, Calcium, Magnesium, Sodium, Sulfate, Chloride. The pH is 8.2 (slightly alkaline). Total dissolved solids measure 2,790 mg/L.