Live · updated daily from USGS
Swimmable water near you
2,135 USGS sensors are reporting a live water temperature right now, the newest reading from August 21, 2026 (20 hrs ago).
- Cold · below 60°F · 375
- Cool · 60–69°F · 594
- Comfortable · 70–86°F · 938
- Warm · above 86°F · 228
- 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.
- POTOMAC RIVER AT POINT OF ROCKS, MDUSGS gauge · Maryland · 3,890 ft³/s78°F19 mi21 hrs ago
- MONOCACY RIVER NEAR DICKERSON, MDUSGS gauge · Maryland · 471 ft³/s75°F21 mi20 hrs ago
- SAMS CREEK AT MCKINSTRYS MILL, MDUSGS gauge · Maryland · 3 ft³/s68°F25 mi20 hrs ago
- Swift Run at Brickcrafter Rd nr New Oxford, PAUSGS gauge · Pennsylvania · 0 ft³/s68°F36 mi20 hrs ago
- CACAPON RIVER NEAR GREAT CACAPON, WVUSGS gauge · West Virginia · 149 ft³/s76°F37 mi20 hrs ago
- DIFFICULT RUN NEAR GREAT FALLS, VAUSGS gauge · Virginia · 61 ft³/s73°F44 mi20 hrs ago
- SNAKEDEN BRANCH ABOVE LAKE AUDUBON AT RESTON, VAUSGS gauge · Virginia · 0 ft³/s72°F45 mi20 hrs ago
- THE GLADE NEAR HOWLAND DRIVE AT RESTON, VAUSGS gauge · Virginia · 0 ft³/s68°F45 mi20 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.