Live · updated daily from USGS
Swimmable water near you
2,136 USGS sensors are reporting a live water temperature right now, the newest reading from August 22, 2026 (6 hrs ago).
- Cold · below 60°F · 384
- Cool · 60–69°F · 607
- Comfortable · 70–86°F · 930
- Warm · above 86°F · 215
- 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.
- MARBLE FORK KAWEAH R AB HORSE C NR LODGEPOLE CAUSGS gauge · California · 0 ft³/s54°F14 mi1 day ago
- SF TULE R NR RESERVATION BNDRY NR PORTERVILLE CAUSGS gauge · California · 7 ft³/s76°F33 mi1 day ago
- SF TULE R NR CHOLOLLO CAMPGROUND NR PORTERVILLE CAUSGS gauge · California · 6 ft³/s64°F34 mi1 day ago
- CROSS C A KANSAS AVE NR HANFORD CAUSGS gauge · California · 0 ft³/s73°F42 mi1 day ago
- NF KINGS R A 24TH AVE BR NR LEMOORE CAUSGS gauge · California · 0 ft³/s75°F55 mi1 day ago
- SAN JOAQUIN R BL FRIANT CAUSGS gauge · California · 419 ft³/s51°F56 mi1 day ago
- MF SAN JOAQUIN R NR MAMMOTH LAKES CAUSGS gauge · California · 16 ft³/s57°F79 mi1 day ago
- HOT C A FLUME NR MAMMOTH LAKES CAUSGS gauge · California · 40 ft³/s94°F81 mi1 day 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.