Live · updated daily from USGS
Swimmable water near you
1,324 USGS sensors are reporting a live water temperature right now, the newest reading from August 23, 2026 (9 hrs ago).
- Cold · below 60°F · 218
- Cool · 60–69°F · 484
- Comfortable · 70–86°F · 544
- Warm · above 86°F · 78
- You
A map of the United States with one coloured dot per USGS sensor reporting a live water temperature. The readings are listed below.
Nearest live readings
The closest USGS sensors currently reporting a water temperature, nearest first.
- Firehole River at Old Faithful, YNPUSGS gauge · Wyoming · 43 ft³/s59°F0.4 mi10 hrs ago
- Firehole River near West Yellowstone MTUSGS gauge · Wyoming · 200 ft³/s72°F11 mi10 hrs ago
- Gibbon River at Madison Jct, YNPUSGS gauge · Wyoming · 75 ft³/s65°F13 mi10 hrs ago
- Madison River near West Yellowstone, MTUSGS gauge · Montana · 296 ft³/s66°F18 mi9 hrs ago
- Tantalus Creek at Norris Junction, YNPUSGS gauge · Wyoming · 2 ft³/s80°F20 mi9 hrs ago
- SNAKE RIVER AB JACKSON LAKE AT FLAGG RANCH WYUSGS gauge · Wyoming · 255 ft³/s64°F26 mi9 hrs ago
- Madison River bl Hebgen Lake nr Grayling MTUSGS gauge · Montana · 760 ft³/s60°F38 mi9 hrs ago
- Lamar River nr Tower Ranger Station YNPUSGS gauge · Wyoming · 212 ft³/s64°F39 mi9 hrs ago
Nearest swimmable spots
Rated, photographed water destinations within 25 miles — pair one with the nearest sensor reading above before you go.
About this map
Every pin is a live reading from a USGS real-time monitoring station, captured in a daily snapshot. Colours follow the site’s cold-water-safety thresholds and describe the water at that one sensor — usually a river or stream gauge, not a swim beach — so treat them as a guide to what the water is doing nearby, not a verdict on a specific spot. Readings are provisional and can be revised by the USGS. Your location only sorts this page: the coordinates appear in the address bar (rounded to about a mile) and are not saved to an account or our database.
Conditions are for general information only and can change quickly. Always judge the water in person and follow posted advisories and local guidance before swimming or paddling.