Hot, On Lamar River
The record names this one Hot, On Lamar River, a USGS-style label for a thermal point on the Lamar River in Yellowstone National Park, reached off the Northeast Entrance Road. No temperature is on file, only a note that the water is warm, so there is no soaking claim to make. It is a hike of nearly two miles from the road, inside the park, and access is listed as open.
Park Service land at around 6,800 feet. The walk in starts from the Northeast Entrance Road and runs about two miles, by the record's measure. Winter snow here is deep, ten feet and then some. Slough Creek Campground is the nearest camping on record, ten miles away.
No best season is listed, and neither temperature nor chemistry is on record. What the record does say is that it is open and a hike in. Plan for summer given the snow, and treat the water as unknown: test it before assuming it is warm enough, or cool enough, for anything. Yellowstone's rules apply.
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, On Lamar River.
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
- Gentle slope
- The ground tilts gently up to the east.
- Highest ground nearby
- 160 ft above the spring
- Within a quarter mile, to the east
A slice through the ground from west to east, about 0.6 miles end to end.
Elevation data: USGS 3D Elevation Program. Aerial imagery: USGS The National Map. Public domain.
That's about twice the US average of 65. It's higher than at 71% 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.
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Overview Slough Creek is near some of the best wildlife watching opportunities in the park. The campground is at the end of a two mile dirt road, and best suited for tents and small RVs. There are plenty of hiking and fishing opportunities in the area, including the Slough Creek Trail which begins nearby. Nighttime offers a quiet, unimpeded view of the stars and the possibility of hearing wolves howl. Elevation: 6,250 ft (1905 m). Recreation There are many opportunities for recreation in the...
Hot, On Lamar River sits at 6,777 feet above sea level, way above the mile-high mark. You may not feel the altitude strongly, but hot water still dehydrates you faster at elevation. UV is about 27% stronger than at sea level, so bring sunscreen and drink more water than you normally would.
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Hot, On Lamar River is road-accessible, so you can bring more gear. Cold air temperatures make a changing robe or warm layers essential.
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