Weekly swim report · August 21, 2026
Colorado swim report
On August 21, 2026 the warmest USGS water reading in Colorado was 76°F at ARKANSAS RIVER BELOW JOHN MARTIN RESERVOIR, CO.; 1 water-related NWS hazard is active.
Warmest water
The 5 warmest of 113 sensors reporting a water temperature in Colorado today. Station names open the official monitoring page.
- #1ARKANSAS RIVER BELOW JOHN MARTIN RESERVOIR, CO.USGS gauge · 177 ft³/s76°F 24°C9 hrs ago
- #2COLORADO RIVER NEAR COLORADO-UTAH STATE LINEUSGS gauge · 1,500 ft³/s75°F 24°C8 hrs ago
- #3PURGATOIRE RIVER AT ROCK CROSSING NR TIMPAS, CO.USGS gauge · 2 ft³/s75°F 24°C9 hrs ago
- #474°F 24°C9 hrs ago
- #5SAN JUAN RIVER AT FOUR CORNERS, COUSGS gauge · 628 ft³/s74°F 23°C9 hrs ago
Active hazards in Colorado
Alerts cover counties or forecast zones — an alert for an area does not mean every river or beach inside it is affected. Times are local to the issuing office.
- CautionFlood Advisory
A Flood Advisory is in effect for Ouray, CO.
NWS Grand Junction CO · until Aug 21, 3:45 PM
Where to swim in Colorado
The most-reviewed, well-rated water destinations in Colorado — check each one’s live conditions before you go.
4.6(9,355)Cherry Creek State Park
Large park around a reservoir with camping, water sports & many other outdoor leisure activities.
Glenwood Hot Springs Pool
Massive, long-running hot-springs pool in serene mountain surrounds, open to the public.
4.4(2,912)Boyd Lake State Park
Placid lakeside park featuring boating, fishing & other water sports plus a campground & more.
4.6(2,042)Sand Dunes Recreation
Outdoor pool for year-round use, with a water slide, volleyball, basketball & more, plus a hot tub.
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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.

