Fumarole Butte
Drag the handle to compare the two views. The orange dot marks the spring, in a frame about three quarters of a mile wide.
Fumarole Butte is a warm spring on open BLM land in Millard County, twenty-two miles from Delta. It is about as roadside as a spring gets, thirteen feet from the road. The water is tepid, low seventies, and there is no chemistry on file. The record has no USGS site number for it either.
Managed by the Fillmore Field Office, this sits above five thousand feet in dry basin country, seven inches of rain in an ordinary year and a light snow season. You park and you are there. Jericho Campground and Picnic Area is the nearest camping listed, about 24 miles away.
Best months per the record are the winter ones. Open access, no fee noted. One reading supplies the temperature and there is no sample, so the warmth is unverified. Delta is the resupply town. The record is silent on a pool or any structure. Public land, no permission required.
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 Fumarole Butte.
- Setting
- Hillside
- The spring sits on a steep slope that climbs to the southwest.
- Highest ground nearby
- 115 ft above the spring
- Within a quarter mile, to the southwest
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.
That's about 1½ times the US average of 65. It's higher than at 48% 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.
See every spring on the geothermal heat map →
Heat flow estimate: Stanford Thermal Earth Model (Aljubran & Horne, 2024), CC BY 4.0.
One of 4 campgrounds within the Little Sahara Recreation Area (LSRA), the Jericho Campground and Picnic Area has 16 sites for camping and/or picnicking. On busy weekends in the spring, LSRA may receive up to 30,000 visitors, large camping groups, and heavy use of public facilities.