Flathead Lake in northwest Montana is the largest natural freshwater lake west of the Mississippi; slightly larger than Lake Tahoe at 27.3 mi. long, 15.5 mi. wide, and max depth of 370.7 ft.
Opposite of Yellow Bay, this swimming area services the Bio Station and is located on the main portion of the lake. The FLBS and this beach ARE NOT accessible to the public for swimming. Yellow Bay State Park adjacent to the FLBS provides public access to Flathead Lake.
As one of the cleanest in the world, Flathead Lake is perfect for OPEN WATER SWIMMING! No sharks, no jellyfish, and no lane lanes...just clear, clean, and crisp water!
Unless you like your water COLD, the effective swimming season is June through September. Average water temps in June are in the 60s, 70s in July and August, and then back down again in September.
Summer air temperatures average in the mid-70s to mid-80s.
Swim Guide shares the best information we have at the moment you ask for it. Always obey signs at the beach or advisories from official government agencies. Stay alert and check for other swimming hazards such as dangerous currents and tides. Please report your pollution concerns so Affiliates can help keep other beach-goers safe.
Beach conditions change constantly, and it is never wise to swim in open water up to 48-hours after a heavy rain. Please use caution!
Flathead Lake in northwest Montana is the largest natural freshwater lake west of the Mississippi; slightly larger than Lake Tahoe at 27.3 mi. long, 15.5 mi. wide, and max depth of 370.7 ft.
Opposite of Yellow Bay, this swimming area services the Bio Station and is located on the main portion of the lake. The FLBS and this beach ARE NOT accessible to the public for swimming. Yellow Bay State Park adjacent to the FLBS provides public access to Flathead Lake.
As one of the cleanest in the world, Flathead Lake is perfect for OPEN WATER SWIMMING! No sharks, no jellyfish, and no lane lanes...just clear, clean, and crisp water!
Unless you like your water COLD, the effective swimming season is June through September. Average water temps in June are in the 60s, 70s in July and August, and then back down again in September.
Summer air temperatures average in the mid-70s to mid-80s.
Swim Guide shares the best information we have at the moment you ask for it. Always obey signs at the beach or advisories from official government agencies. Stay alert and check for other swimming hazards such as dangerous currents and tides. Please report your pollution concerns so Affiliates can help keep other beach-goers safe.
Beach conditions change constantly, and it is never wise to swim in open water up to 48-hours after a heavy rain. Please use caution!
Swim Guide shares the best information we have at the moment you ask for it. Always obey signs at the beach or advisories from official government agencies. Stay alert and check for other swimming hazards such as dangerous currents and tides. Please report your pollution concerns so Affiliates can help keep other beach-goers safe. Swim Guide, "Swim Drink Fish icons," and associated trademarks are owned by SWIM DRINK FISH CANADA. See Legal.
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