LakeCount. Every Lake. Measured.
Wisconsin
Wisconsin5,551 lakes & pondsMinnesota3,727 lakes & pondsMichigan3,837 lakes & pondsNew York1,783 lakes & pondsVermont425 lakes & pondsMaine1,671 lakes & pondsFlorida2,294 lakes & pondsPennsylvania743 lakes & pondsOhio352 lakes & pondsWashington1,427 lakes & pondsNorth Dakota756 lakes & pondsMontana1,695 lakes & ponds
24,261 Lakes & Ponds

Lakes / Montana / Upper Seymour Lake

Upper Seymour Lake, Montana

40 acres
Surface Area
About 80 ft
Max Depth (Approximate)
8,304.960000000001 ft
Surface Elevation

Where It Sits, and How Deep It Goes

Locator - Montana

BillingsMissoulaUpper Seymour LakeDeer Lodge Co.

46.04 degrees N, 113.27 degrees W - Deer Lodge County. State and county outlines drawn from Census boundary data; the lake marker is placed by its Montana Fish, Wildlife & Parks coordinates, not by eye. Schematic - not a survey map.

Depth Profile - Upper Seymour Lake

0 ft - SurfaceMax Depth (Approx.) - About 80 ftA Typical Shallow Lake - Under 20 ft Deep

Schematic cross-section drawn to one shared depth scale - not a survey or bathymetric map. Max depth is approximate, from state bathymetry.

Facts and Figures

Waterbody ID49977722
CountyDeer Lodge
Coordinates46.0368, -113.2701

Largest Lakes in Montana

#LakeCountySurface AreaMax Depth
1Fort Peck LakeValley233,053 acres-
2Flathead LakeLake122,132 acresAbout 380 ft
3Canyon Ferry LakeBroadwater32,773 acresAbout 170 ft
4Lake KoocanusaLincoln28,723 acres-
5Hungry Horse ReservoirFlathead23,577 acres-
Sources: Montana Fish, Wildlife & Parks lake data (ID 49977722); Washington Dept. of Ecology bathymetry (approximate max depth). Verified October 30, 2026.