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 sounding. Cass Lake is charted here across 12 closed depth contours, from the 5 ft line down to 120 ft, enclosing about 559 acres of water. Half of that water lies inside the 60 ft line, and only 1.5 acres lie inside the deepest one. Every contour is on the interactive map below, free and without an account.
Data: Michigan DNR Inland Lake Contours (public record). Contours closed, checked and area-computed by Jordan Carter, founder of GilledIt · page updated
Cass Lake depth chart: 12 depth contours from 5 to 120 ft
Data: Michigan DNR Inland Lake Contours (public record), retrieved August 2026 · depths change over time · not for navigation
| Depth contour | Water inside it | Share of mapped water |
|---|---|---|
| 5 ft | 559 acres | 100% |
| 20 ft | 528 acres | 95% |
| 30 ft | 451 acres | 81% |
| 40 ft | 382 acres | 68% |
| 50 ft | 295 acres | 53% |
| 60 ft | 218 acres | 39% |
| 70 ft | 167 acres | 30% |
| 80 ft | 128 acres | 23% |
| 90 ft | 81 acres | 14% |
| 100 ft | 36 acres | 6.5% |
| 110 ft | 13 acres | 2.4% |
| 120 ft | 1.5 acres | under 1% |
Acreages are computed from the closed Michigan DNR Inland Lake Contours contour rings, with islands subtracted. Shares are of the 559 acres inside the outermost charted contour (the 5 ft line), which is the outer edge of the mapped water, several state files carry no 0 ft shoreline line, so this is not the same as a share of the lake's published surface area. The survey also records a 123 ft sounding, marked as a point rather than a closed contour, so it is not charted as a band.
Fishing Cass Lake: a stepped drop into deep water
About 559 acres of Cass Lake sit inside the survey's 5 ft contour, and half of that water is already gone by the 60 ft line: the drop to the deep basin comes in stages, each contour giving up another slice of water, rather than in one abrupt wall. The steepest break on the chart runs from 40 down to 50 ft: 87 acres of bottom fall away across 10 ft there, which makes that band the first contour to work. The deepest 120 ft contour holds 1.5 acres, under 1% of the mapped water, toward the southern end of the lake. 123 ft of water makes this a two-story fishery: warm-water fish hold the 5-to-60 ft ground while the basin can stay cold below the summer thermocline, and the traffic between the two runs along the 40–50 ft break at first and last light.
Ice fishing on Cass Lake
Cass Lake freezes later and less evenly than the shallow waters around it, and the winter bite sets up on the first real break rather than out over the 120 ft hole. The 40–50 ft band on the chart above is that edge: 87 acres of bottom tilt away there, and panfish and walleye slide up and down it through the day. Late ice pushes fish back onto the 5-to-60 ft flat. Check ice thickness locally before you walk out.
Cass Lake depth map FAQs
- How deep is Cass Lake?
- Cass Lake is at least 123 feet deep. That figure is the deepest surveyed sounding in the Michigan DNR Inland Lake Contours survey, a point measurement rather than a closed contour, so the deepest line you can actually trace on the map is the 120 ft contour, and the water may run deeper still.
- Where is the deepest part of Cass Lake?
- The deepest charted water on Cass Lake lies inside the 120 ft contour, toward the southern end of the lake. That contour encloses 1.5 acres, under 1% of the mapped water, so it is a small target on a big lake, the depth chart above gives the contour to line up on.
- How much of Cass Lake is shallower than 60 feet?
- About half. The 60 ft contour encloses 218 acres of the roughly 559 acres inside the outer 5 ft line, so the other half of the water is shallower than 60 feet. The sharpest drop is between 40 and 50 feet, where the mapped water sheds 87 acres.
- How accurate is this Cass Lake depth map?
- The contours come from the Michigan DNR Inland Lake Contours survey, retrieved August 2026 and last rebuilt on August 19, 2026. 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. Acreages are computed from the published contour geometry, not from a separate area survey, so read them as close approximations.
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