Weekly swim report · August 21, 2026
Montana swim report
On August 21, 2026 the warmest USGS water reading in Montana was 74°F at Milk River at Nashua MT; no water-related NWS hazards are active.
Warmest water
The 5 warmest of 76 sensors reporting a water temperature in Montana today. Station names open the official monitoring page.
- #1Milk River at Nashua MTUSGS gauge · 153 ft³/s74°F 23°C9 hrs ago
- #2Tongue R bl Brandenberg bridge nr Ashland MTUSGS gauge · 230 ft³/s73°F 23°C9 hrs ago
- #3Missouri River near Landusky MTUSGS gauge · 5,820 ft³/s73°F 23°C8 hrs ago
- #4Yellowstone River near Sidney MTUSGS gauge · 3,080 ft³/s73°F 23°C9 hrs ago
- #5Yellowstone River Fish Bypass Channel nr Intake MTUSGS gauge · 570 ft³/s73°F 23°C9 hrs ago
Active hazards in Montana
No water-related NWS hazards are active in Montana right now. Checked live against the National Weather Service alert feed.
Where to swim in Montana
The most-reviewed, well-rated water destinations in Montana — check each one’s live conditions before you go.
4.8(2,547)Giant Springs State Park
Home to one of the largest freshwater springs in North America, the Rainbow Dam & 30 miles of trail.
4.4(1,087)Lake Elmo State Park
This 64-acre park features a lake with swimming, boating & fishing, plus a 1.4-mi. hiking trail.
Lake McDonald
This scenic alpine lake, the largest lake in Glacier National Park, offers kayaking & canoeing.
Hyalite Reservoir
Artificial lake with campgrounds, forest hikes & kayaking, plus cross-country ski trails in winter.
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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.

