How deep is Big Lake?

Big Lake reaches a maximum depth of 81 feet, according to the Michigan DNR Inland Lake Contours survey. Most of the lake is shallower, with 12 mapped depth bands between the shoreline and the deepest hole.

Where is the deepest part of Big Lake?

The deepest surveyed water on Big Lake sits toward the northwestern corner of the lake, inside the 81 ft contour. The interactive depth map above shows the full basin outline and the breaks leading into it.

How accurate is this Big 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

Big Lake depth map

Big Lake in Otsego County, Michigan reaches a depth of 81 feet. The official Michigan survey maps 12 depth bands across 27 contour lines. This free map of Big Lake shows every surveyed contour as an interactive depth chart you can use to plan a session before you travel.

Big Lake depth chart: 12 depth bands to 81 ft

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

Big Lake depth chart data
Depth contour	Share of mapped area inside it
5 ft	about 100%
10 ft	about 94%
20 ft	about 79%
30 ft	about 50%
40 ft	about 25%
50 ft	about 15%
60 ft	about 9%
70 ft	about 5%
80 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 Big Lake: deep, two-story water

At 81 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 12 mapped depth bands make it straightforward to find those breaks before you launch.

Ice fishing on Big Lake

On deep water like Big 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.

Big Lake depth map FAQs

How deep is Big Lake?: Big Lake reaches a maximum depth of 81 feet, according to the Michigan DNR Inland Lake Contours survey. Most of the lake is shallower, with 12 mapped depth bands between the shoreline and the deepest hole.
Where is the deepest part of Big Lake?: The deepest surveyed water on Big Lake sits toward the northwestern corner of the lake, inside the 81 ft contour. The interactive depth map above shows the full basin outline and the breaks leading into it.
How accurate is this Big 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 Big Lake

Big Chub Lake depth map · 74+ ft max · 8 mi away
Bridge Lake depth map · 87 ft max · 8 mi away
Heart Lake depth map · 123 ft max · 10 mi away
Big Bradford Lake depth map · 102 ft max · 12 mi away
Seventh Spectacle Lake depth map · 32 ft max · 12 mi away

Mapped fishing venues near Big Lake

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

Big Chub Lake · 8 mi away
Bridge Lake · 8 mi away
Heart Lake · 10 mi away

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