How deep is Cass Lake?

Cass Lake is more than 123 feet deep. The deepest contour in the Michigan DNR Inland Lake Contours survey is the 123 foot line, and the lake continues deeper inside it, with 25 depth bands mapped in total.

Where is the deepest part of Cass Lake?

The deepest surveyed water on Cass Lake sits toward the southern end of the lake, inside the 123 ft contour. The interactive depth map above shows the full basin outline and the breaks leading into it.

How accurate is this Cass Lake depth map?

The contours come from the Michigan DNR Inland Lake Contours survey. Depths change over time with water levels and sediment, so treat this map as a planning guide for fishing, and never use it for navigation.

Michigan lake depth maps

Cass Lake depth map

Cass Lake in Oakland County, Michigan reaches a depth of more than 123 feet at its deepest surveyed contour. The official Michigan survey maps 25 depth bands across 95 contour lines. This free map of Cass Lake shows every surveyed contour as an interactive depth chart you can use to plan a session before you travel.

Cass Lake depth chart: 25 depth bands to 123+ ft

Data: Michigan DNR Inland Lake Contours (public record), retrieved August 2026 · depths change over time · not for navigation

Cass Lake depth chart data
Depth contour	Share of mapped area inside it
5 ft	about 76%
30 ft	about 24%
50 ft	about 15%
90 ft	about 4%
123 ft	under 1%

Share of the surveyed surface area enclosed by each depth contour, computed from the Michigan DNR Inland Lake Contours data.

How to fish Cass Lake: deep, two-story water

At 123 feet, this is a two-story fishery: warm-water species work the shallows and weed edges while the deep basin can hold cold-water fish below the summer thermocline. In summer, target the transition where the bottom breaks from the shallow shelf toward the basin; fish suspend along that edge at dawn and dusk. The 25 mapped depth bands make it straightforward to find those breaks before you launch.

Ice fishing on Cass Lake

On deep water like Cass Lake, the winter bite concentrates along the first major drop-off rather than the deepest basin. Use the contours above to find where the shallow shelf breaks toward deep water and set up on that edge; panfish and walleye slide up and down it through the day. Late ice often pushes fish shallower again. Always verify ice thickness locally before walking out, and remember deep lakes freeze later and less evenly than shallow ones.

Cass Lake depth map FAQs

How deep is Cass Lake?: Cass Lake is more than 123 feet deep. The deepest contour in the Michigan DNR Inland Lake Contours survey is the 123 foot line, and the lake continues deeper inside it, with 25 depth bands mapped in total.
Where is the deepest part of Cass Lake?: The deepest surveyed water on Cass Lake sits toward the southern end of the lake, inside the 123 ft contour. The interactive depth map above shows the full basin outline and the breaks leading into it.
How accurate is this Cass Lake depth map?: The contours come from the Michigan DNR Inland Lake Contours survey. Depths change over time with water levels and sediment, so treat this map as a planning guide for fishing, and never use it for navigation.

Depth maps for lakes near Cass Lake

Elizabeth Lake depth map · 72+ ft max · 2 mi away
Orchard Lake depth map · 111 ft max · 2 mi away
Otter Lake depth map · 70+ ft max · 2 mi away
Pine Lake depth map · 90+ ft max · 2 mi away
Green Lake depth map · 72 ft max · 2 mi away

Mapped fishing venues near Cass Lake

Cass Lake in the venue directory covers access and fishing details for this water.

Elizabeth Lake · 2 mi away
Orchard Lake · 2 mi away
Otter Lake · 2 mi away

Fishing in Michigan needs a state license: Michigan fishing license guide · all Michigan venues