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The Water Around Us
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Live · updated daily from USGS

Swimmable water near you

2,140 USGS sensors are reporting a live water temperature right now, the newest reading from August 22, 2026 (3 hrs ago).

Clear location
  • Cold · below 60°F · 384
  • Cool · 60–69°F · 607
  • Comfortable · 70–86°F · 934
  • 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.

  1. POTOMAC RIVER AT POINT OF ROCKS, MDUSGS gauge · Maryland · 3,890 ft³/s
    78°F13 mi1 day ago
  2. MONOCACY RIVER NEAR DICKERSON, MDUSGS gauge · Maryland · 471 ft³/s
    75°F19 mi1 day ago
  3. FLATLICK BRANCH ABOVE FROG BRANCH AT CHANTILLY, VAUSGS gauge · Virginia · 1 ft³/s
    72°F30 mi4 hrs ago
  4. SNAKEDEN BRANCH ABOVE LAKE AUDUBON AT RESTON, VAUSGS gauge · Virginia · 0 ft³/s
    70°F31 mi4 hrs ago
  5. THE GLADE NEAR HOWLAND DRIVE AT RESTON, VAUSGS gauge · Virginia · 0 ft³/s
    68°F32 mi4 hrs ago
  6. S F LITTLE DIFFICULT RUN ABOVE MOUTH NR VIENNA, VAUSGS gauge · Virginia · 0 ft³/s
    71°F32 mi4 hrs ago
  7. DIFFICULT RUN NEAR GREAT FALLS, VAUSGS gauge · Virginia · 13 ft³/s
    73°F33 mi4 hrs ago
  8. DIFFICULT RUN ABOVE FOX LAKE NEAR FAIRFAX, VAUSGS gauge · Virginia · 2 ft³/s
    71°F33 mi4 hrs ago

Nearest swimmable spots

Rated, photographed water destinations within 25 miles — pair one with the nearest sensor reading above before you go.

No rated, photographed swim spots within 25 miles of this point yet. The nearest sensor readings above still tell you what the water is doing — or search any river, lake or beach by name.
Search a spot →

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.