Overview
Flathead Lake is a natural lake in MT. Primary inflow is Flathead River. It is managed by Confederated Salish and Kootenai Tribes / Montana DNRC.
The basin is characterized by about 122,800 acres of surface area, roughly 185 miles of shoreline, a maximum depth near 370 feet. Shoreline and bottom character vary from protected coves and flats to deeper water, supporting a mix of open-water and nearshore habitats.
Flathead Lake supports recreational boating and fishing. Public access is through area ramps, parks, and shoreline facilities where provided by the operator. Fishing and boating regulations are set by the relevant state wildlife agency.
Flathead Lake is not operated to a classic reservoir full-pool curve. Where a gauge exists, water-surface elevation is the reference. Conditions still matter for boating, fishing access, and shoreline use.
Current Conditions
- 7-day trendRisingLatest movement can differ from the seven-day trend.
- 7-day changeUp 0.12 ft
- 30-day changeUp 0.12 ft
- Drought conditionsNo Drought
About This Lake
Learn how this lake is managed, what affects its water level, and where Lake Insights gets its data.
Flathead Lake is a 122,800-acre reservoir on the Flathead River managed by Confederated Salish and Kootenai Tribes / Montana DNRC.
