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 (23 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.
- GUNPOWDER FALLS NEAR PARKTON, MDUSGS gauge · Maryland · 108 ft³/s59°F8.4 mi1 day ago
- SCOTTS LEVEL BRANCH AT ROCKDALE, MDUSGS gauge · Maryland · 1 ft³/s70°F13 mi23 hrs ago
- PLUMTREE RUN NEAR BEL AIR, MDUSGS gauge · Maryland · 4 ft³/s70°F15 mi23 hrs ago
- FOSTER BRANCH NEAR JOPPATOWNE, MDUSGS gauge · Maryland · 1 ft³/s70°F16 mi23 hrs ago
- Muddy Creek at Castle Fin, PAUSGS gauge · Pennsylvania · 84 ft³/s69°F24 mi23 hrs ago
- SUSQUEHANNA RIVER NEAR DARLINGTON, MDUSGS gauge · Maryland80°F26 mi23 hrs ago
- Susquehanna River near Peach Bottom, PAUSGS gauge · Pennsylvania80°F26 mi1 day ago
- SAMS CREEK AT MCKINSTRYS MILL, MDUSGS gauge · Maryland · 3 ft³/s68°F29 mi23 hrs ago
Nearest swimmable spots
Rated, photographed water destinations within 25 miles — pair one with the nearest sensor reading above before you go.
4.6(326)Loch Raven Reservoir
Sprawling, artificial lake with hiking trails & historic bridges, plus a fishing & boating center.
4.6 mi from your location
4.7(813)Lake Roland Nature Council
Multifaceted green space with trails, pavilions, waterfront activities & an off-leash dog park.
9.2 mi from your location
4.5(3,496)Gunpowder Falls State Park Hammerman Area
Gunpowder River hub for picnics & kayaking, with rentable picnic shelters, fishing & swimming.
18 mi from your location
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.

