How deep is Corey Lake?

Corey Lake is more than 70 feet deep. The deepest contour in the Michigan DNR Inland Lake Contours survey is the 70 foot line, and the lake continues deeper inside it.

Where is the deepest part of Corey Lake?

The deepest charted water on Corey Lake lies inside the 70 ft contour, toward the southeastern corner of the lake. That contour encloses 43 acres, 12% of the mapped water, so it is a small target on a small water, the depth chart above gives the contour to line up on.

How much of Corey Lake is shallower than 40 feet?

About half. The 40 ft contour encloses 177 acres of the roughly 364 acres inside the outer 10 ft line, so the other half of the water is shallower than 40 feet. The sharpest drop is between 40 and 50 feet, where the mapped water sheds 74 acres.

How accurate is this Corey 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.

Michigan lake depth maps

Corey Lake depth map

Corey Lake in St. Joseph County, Michigan reaches a depth of more than 70 feet at its deepest surveyed contour. Corey Lake is charted here across 7 closed depth contours, from the 10 ft line down to 70 ft, enclosing about 364 acres of water. Half of that water lies inside the 40 ft line, and only 43 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 August 19, 2026

Corey Lake depth chart: 7 depth contours from 10 to 70 ft

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

Corey Lake depth chart data: water enclosed by each contour
Depth contour	Water inside it	Share of mapped water
10 ft	364 acres	100%
20 ft	299 acres	82%
30 ft	232 acres	64%
40 ft	177 acres	49%
50 ft	103 acres	28%
60 ft	69 acres	19%
70 ft	43 acres	12%

Acreages are computed from the closed Michigan DNR Inland Lake Contours contour rings, with islands subtracted. Shares are of the 364 acres inside the outermost charted contour (the 10 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.

Fishing Corey Lake: a stepped drop into deep water

About 364 acres of Corey Lake sit inside the survey's 10 ft contour, and half of that water is already gone by the 40 ft line: the bottom steps down contour by contour into the deep basin rather than shelving flat or plunging all at once. The steepest break on the chart runs from 40 down to 50 ft: 74 acres of bottom fall away across 10 ft there, which makes that band the first contour to work. 43 acres, 12% of the mapped water, lie inside the deepest 70 ft contour, toward the southeastern corner of the lake. At 70 ft this is two-story water: the basin can stay cold below the summer thermocline while warm-water fish stay up on the 10-to-40 ft ground, and the fish that move between the two do it along the 40–50 ft break at first and last light.

Ice fishing on Corey Lake

Deep water like Corey Lake freezes later and less evenly than the shallow lakes around it, and the winter bite sets up on the first real break, not out over the 70 ft hole. That edge is the 40–50 ft band on the chart above, where 74 acres of bottom tilt away, and panfish and walleye work up and down it through the day. By late ice the fish push back onto the 10-to-40 ft flat. Check ice thickness locally before you walk out.

Corey Lake depth map FAQs

How deep is Corey Lake?: Corey Lake is more than 70 feet deep. The deepest contour in the Michigan DNR Inland Lake Contours survey is the 70 foot line, and the lake continues deeper inside it.
Where is the deepest part of Corey Lake?: The deepest charted water on Corey Lake lies inside the 70 ft contour, toward the southeastern corner of the lake. That contour encloses 43 acres, 12% of the mapped water, so it is a small target on a small water, the depth chart above gives the contour to line up on.
How much of Corey Lake is shallower than 40 feet?: About half. The 40 ft contour encloses 177 acres of the roughly 364 acres inside the outer 10 ft line, so the other half of the water is shallower than 40 feet. The sharpest drop is between 40 and 50 feet, where the mapped water sheds 74 acres.
How accurate is this Corey 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 Corey Lake

Birch Lake depth map · 80+ ft max · 7 mi away
Donnell Lake depth map · 60+ ft max · 8 mi away
Shavehead Lake depth map · 70+ ft max · 9 mi away
Hemlock Lake depth map · 70+ ft max · 9 mi away
Cedar Lake depth map · 84 ft max · 12 mi away

Mapped fishing venues near Corey Lake

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

Birch Lake · 7 mi away
Donnell Lake · 8 mi away
Shavehead Lake · 9 mi away

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