Live · updated daily from USGS
Swimmable water near you
2,134 USGS sensors are reporting a live water temperature right now, the newest reading from August 22, 2026 (20 hrs ago).
- Cold · below 60°F · 383
- Cool · 60–69°F · 607
- Comfortable · 70–86°F · 929
- 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.
- Delaware and Raritan Canal at Port Mercer NJUSGS gauge · New Jersey · 133 ft³/s76°F1.9 mi21 hrs ago
- Delaware River at Trenton NJUSGS gauge · New Jersey · 10,500 ft³/s76°F9.4 mi21 hrs ago
- D&R Ca feeder US of gate at Washington Crossing NJUSGS gauge · New Jersey · 128 ft³/s75°F11 mi21 hrs ago
- 75°F11 mi21 hrs ago
- 76°F11 mi20 hrs ago
- Millstone River at Blackwells Mills NJUSGS gauge · New Jersey · 509 ft³/s77°F11 mi21 hrs ago
- Crosswicks Creek at Extonville NJUSGS gauge · New Jersey · 86 ft³/s74°F14 mi21 hrs ago
- Raritan River at Manville NJUSGS gauge · New Jersey · 691 ft³/s73°F16 mi21 hrs ago
Nearest swimmable spots
Rated, photographed water destinations within 25 miles — pair one with the nearest sensor reading above before you go.
4.5(72)Carnegie Lake
Sprawling reservoir in wooded surrounds, popular among rowers, anglers & ice skaters.
2.6 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.