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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 22, 2026 (12 hrs ago).

Clear location
  • Cold · below 60°F · 384
  • 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.

  1. TUOLUMNE R A GRAND CYN OF TUOLUMNE AB HETCH HETCHYUSGS gauge · California · 32 ft³/s
    68°F20 mi1 day ago
  2. MERCED R A HAPPY ISLES BRIDGE NR YOSEMITE CAUSGS gauge · California · 19 ft³/s
    60°F21 mi1 day ago
  3. DEADMAN C A BIG SPRINGS NR CRESTVIEW CAUSGS gauge · California · 20 ft³/s
    51°F24 mi1 day ago
  4. MF SAN JOAQUIN R NR MAMMOTH LAKES CAUSGS gauge · California · 16 ft³/s
    57°F25 mi1 day ago
  5. TUOLUMNE R NR HETCH HETCHY CAUSGS gauge · California · 117 ft³/s
    50°F28 mi1 day ago
  6. ELEANOR C NR HETCH HETCHY CAUSGS gauge · California · 22 ft³/s
    72°F32 mi1 day ago
  7. HOT C A FLUME NR MAMMOTH LAKES CAUSGS gauge · California · 40 ft³/s
    94°F32 mi1 day ago
  8. CHERRY C BL VALLEY DAM NR HETCH HETCHY CAUSGS gauge · California · 15 ft³/s
    48°F34 mi1 day ago

Nearest swimmable spots

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

Yosemite Falls4.9(1,234)

Yosemite Falls

Waterfall · Yosemite Valley, California
Camping nearbyTallest in North AmericaThree-tiered Falls

Iconic 2,425-foot waterfall in Yosemite National Park, featuring upper fall, middle cascades, and lower fall. Best viewing in spring during snowmelt.

Hiking Trails · Viewing Areas · Photography Spots · Visitor Center

21 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.