Great Lakes lake depth maps

Lake St. Clair depth map

Lake St. Clair in the Great Lakes basin reaches a depth of more than 25 feet at its deepest surveyed contour. The official Great Lakes survey maps 6 depth bands across 256 contour lines. This free map of Lake St. Clair shows every surveyed contour as an interactive depth chart you can use to plan a session before you travel.

Lake St. Clair depth chart: 6 depth bands to 25+ ft

Data: NOAA National Centers for Environmental Information, Great Lakes bathymetry (public domain), retrieved August 2026 · depths change over time · not for navigation

Lake St. Clair depth chart data
Depth contourShare of mapped area inside it
3 ftabout 33%
5 ftabout 11%
20 ftabout 11%

Share of the surveyed surface area enclosed by each depth contour, computed from the NOAA NCEI Great Lakes bathymetry data.

How to fish Lake St. Clair: shallow, weed-oriented water

Topping out around 25 feet, this is a shallow fishery where weed growth, not depth, structures the water. The contours still matter: the deepest hole concentrates fish in high summer and under ice, and subtle one-band depressions are the spots most anglers row straight past. In winter, shallow lakes like this are often first to make safe ice, and the deepest mapped hole is the classic starting point.

Ice fishing on Lake St. Clair

Shallow lakes like Lake St. Clair are usually among the first to make safe, fishable ice. The deepest mapped hole is the classic starting point because it concentrates fish once weed beds die back, and the subtle depressions on the map above are the spots most anglers walk straight past. Always verify ice thickness locally before walking out.

Lake St. Clair depth map FAQs

How deep is Lake St. Clair?
Lake St. Clair is more than 25 feet deep. The deepest contour in the NOAA NCEI Great Lakes bathymetry survey is the 25 foot line, and the lake continues deeper inside it, with 6 depth bands mapped in total.
Where is the deepest part of Lake St. Clair?
The deepest surveyed water on Lake St. Clair sits toward the middle of the lake, inside the 25 ft contour. The interactive depth map above shows the full basin outline and the breaks leading into it.
How accurate is this Lake St. Clair depth map?
The contours come from the NOAA NCEI Great Lakes bathymetry 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. The NOAA compilation maps open-lake survey lines spaced 500 to 2,500 meters apart, so it shows whole-lake basin structure rather than individual reefs or drop-offs.

Depth maps for lakes near Lake St. Clair