Big (Ash Meadows) Spring

Nye County, Nevada · Near Pahrump
36.3750°N, 116.2740°W · 2,240 ft
83°F 67°F air · Good soaking weather 2,240 ft Restricted Roadside US Fish and Wildlife Service
Aerial view of the ground around Big (Ash Meadows) Spring LiDAR bare-earth view of the same ground around Big (Ash Meadows) 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.

Big Spring is a warm desert spring in Nye County, about nineteen miles from Pahrump, inside Ash Meadows, a national wildlife refuge. The federal Fish and Wildlife Service runs the place and lists this spring's access as restricted. Tepid water, warm to the hand and short of bath temperature. Bathing is off the table; this is protected refuge water.

Location

A road runs a little over a hundred feet off, though no name for it was recorded. This is low ground on the Mojave desert floor, where rain amounts to maybe four inches in an average year and snow almost never falls. Federal refuge land, nothing beyond that.

Go in winter; the record scores December through February best and the desert is at its kindest then. Access is restricted, so expect viewing only and leave the water alone. Chemistry on file dates from a 1996 sample and shows moderately mineralized water with a near-neutral pH. No camping or fee is recorded for this spot.

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 Big (Ash Meadows) Spring.

Setting
Open ground
Flat, open ground all around.
Highest ground nearby
10 ft above the spring
Within a quarter mile, to the north
Cross-section through the spring

A slice through the ground from north to south, about 0.6 miles end to end.

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

Heat Below
99 milliwatts per square meter of heat flow

That's about 1½ times the US average of 65. It's higher than at 46% 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
47°
Jan
51°
Feb
59°
Mar
67°
Apr
74°
May
86°
Jun
91°
Jul
90°
Aug
82°
Sep
68°
Oct
55°
Nov
45°
Dec
Annual Precip: 4.0 in Annual Snow: 0.7 in
Best Time to Visit
December Air 45°F · Water 83°F · +38° contrast
January Air 47°F · Water 83°F · +36° contrast
February Air 51°F · Water 83°F · +32° contrast
December offers 46°F more contrast than July
Current Conditions
67°F
WNW 0.1 mph 22% Good soaking weather
Tuesday 97° Low 65° Sunny
Wednesday 94° Low 67° Sunny
Thursday 93° Low 64° Sunny
Friday 97° Low 63° Sunny
Saturday 99° Low 62° Sunny
Water Chemistry Sampled 1996-09-21

The water at Big (Ash Meadows) Spring is slightly alkaline (pH 7.3) with 480 mg/L total dissolved solids.

pH 7.3 Slightly Alkaline
pH influences mineral absorption through skin
Higher mineral concentration for therapeutic soaking
Calcium 41 mg/L
May support bone density and joint health
Magnesium 18 mg/L
Known for muscle relaxation and stress relief
Sodium 96 mg/L
Supports circulation and skin hydration
Sulfate 110 mg/L
Traditionally used for skin conditions and inflammation
Chloride 25 mg/L
Natural antiseptic with skin health benefits
Iron 4 µg/L
Iron-rich springs may support circulation
Temperature
83°F
Warm Hot Boiling
Water Temp 83°F (28°C)
Avg Air Temp 68°F
Above Ambient +15°F
Mild soaking conditions September
Access
Restricted
Road Access Roadside
Distance to Road 124 ft
Land
Ownership Federal
Agency US Fish and Wildlife Service
Designation National Wildlife Refuge
Unit Ash Meadows National Wildlife Refuge
Manager US Fish and Wildlife Service
Protection 1 - Permanent protection, natural state
Frequently Asked Questions
What is the water temperature at Big (Ash Meadows) Spring?
Big (Ash Meadows) Spring has a water temperature of 83°F (28°C). This is a warm thermal spring.
Where is Big (Ash Meadows) Spring located?
Big (Ash Meadows) Spring is located in Nye County, Nevada at 2,240 feet elevation, near Pahrump. Coordinates: 36.3750°N, 116.2740°W.
How do I get to Big (Ash Meadows) Spring?
Big (Ash Meadows) Spring has Roadside road access (124 ft from the road).
Is Big (Ash Meadows) Spring free to visit?
Big (Ash Meadows) Spring has Restricted access. It is managed by US Fish and Wildlife Service.
What minerals are in the water at Big (Ash Meadows) Spring?
Water chemistry analysis shows the presence of pH, Total Dissolved Solids, Calcium, Magnesium, Sodium, Sulfate, Chloride, Iron. The pH is 7.3 (slightly alkaline). Total dissolved solids measure 480 mg/L.
Sources: USGS NWIS