Live · updated daily from USGS
Swimmable water near you
2,137 USGS sensors are reporting a live water temperature right now, the newest reading from August 21, 2026 (12 hrs ago).
- Cold · below 60°F · 375
- Cool · 60–69°F · 595
- Comfortable · 70–86°F · 938
- Warm · above 86°F · 229
- 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.
- DIFFICULT RUN NEAR GREAT FALLS, VAUSGS gauge · Virginia · 61 ft³/s73°F10.0 mi13 hrs ago
- DEAD RUN AT WHANN AVENUE NEAR MCLEAN, VAUSGS gauge · Virginia · 0 ft³/s73°F12 mi12 hrs ago
- POTOMAC RIVER NEAR WASH, DC LITTLE FALLS PUMP STAUSGS gauge · Maryland · 3,230 ft³/s81°F13 mi12 hrs ago
- SNAKEDEN BRANCH ABOVE LAKE AUDUBON AT RESTON, VAUSGS gauge · Virginia · 0 ft³/s72°F14 mi13 hrs ago
- THE GLADE NEAR HOWLAND DRIVE AT RESTON, VAUSGS gauge · Virginia · 0 ft³/s68°F14 mi12 hrs ago
- MONOCACY RIVER NEAR DICKERSON, MDUSGS gauge · Maryland · 471 ft³/s75°F14 mi12 hrs ago
- Rock Creek at Joyce Rd Washington, DCUSGS gauge · 75 ft³/s76°F15 mi12 hrs ago
- S F LITTLE DIFFICULT RUN ABOVE MOUTH NR VIENNA, VAUSGS gauge · Virginia · 1 ft³/s72°F16 mi13 hrs ago
Nearest swimmable spots
Rated, photographed water destinations within 25 miles — pair one with the nearest sensor reading above before you go.
4.7(2,489)Seneca Creek State Park
This 6,300 acre park of forest & farmlands offers hunting, fresh water fishing & hiking trails.
1.7 mi from your location
4.7(2,190)Rock Creek Regional Park
Parkland with multiple hiking trails & lakeshore wildlife-watching, plus playgrounds & boat rentals.
5.7 mi from your location
4.7(232)Lake Needwood
Scenic 75-acre boating & fishing lake in a regional park surrounded by forest & hiking trails.
5.9 mi from your location
4.8(1,333)Riverbend Park Visitor's Center
The Potomac River cuts through this park which offers hiking, fishing, canoeing & other activities.
7.0 mi from your location
4.7(573)Great Falls
Stretch of powerful rapids & waterfalls on the Potomac River, with hiking trails nearby.
8.4 mi from your location
4.8(13,185)Great Falls Park
Boasting spectacular falls & rushing white water, this park offers picnic areas, trails & boating.
8.7 mi from your location
4.5(120)Lake Anne
This tree-lined reservoir in a residential area offers boating, a promenade & waterfront eateries.
12 mi from your location
4.0(30)Triadelphia Reservoir
This 800-acre reservoir on the Patuxent River features fishing & non-motorized boating.
13 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.



