How deep is Mary Lake?

Mary Lake is more than 80 feet deep. The deepest contour in the Michigan DNR Inland Lake Contours survey is the 80 foot line, and the lake continues deeper inside it.

Where is the deepest part of Mary Lake?

The deepest charted water on Mary Lake lies inside the 80 ft contour, toward the middle of the lake. That contour encloses under an acre, under 1% 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 Mary Lake is shallower than 40 feet?

About half. The 40 ft contour encloses 17 acres of the roughly 50 acres inside the outer 10 ft line, so the other half of the water is shallower than 40 feet. The sharpest drop is between 20 and 30 feet, where the mapped water sheds 14 acres.

How accurate is this Mary 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

Mary Lake depth map

Mary Lake in Dickinson County, Michigan reaches a depth of more than 80 feet at its deepest surveyed contour. Mary Lake is charted here across 8 closed depth contours, from the 10 ft line down to 80 ft, enclosing about 50 acres of water. Half of that water lies inside the 40 ft line, and only under an acre 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

Mary Lake depth chart: 8 depth contours from 10 to 80 ft

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

Mary Lake depth chart data: water enclosed by each contour
Depth contour	Water inside it	Share of mapped water
10 ft	50 acres	100%
20 ft	41 acres	82%
30 ft	27 acres	55%
40 ft	17 acres	33%
50 ft	11 acres	23%
60 ft	7.8 acres	16%
70 ft	3.3 acres	6.7%
80 ft	under 1 acre	under 1%

Acreages are computed from the closed Michigan DNR Inland Lake Contours contour rings, with islands subtracted. Shares are of the 50 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 Mary Lake: a stepped drop into deep water

The survey encloses about 50 acres of Mary Lake inside its 10 ft contour, and half of that water lies inside the 40 ft line, so the bottom steps down contour by contour into the deep basin rather than shelving flat or plunging all at once. Between 20 and 30 ft the mapped water sheds 14 acres in 10 ft of depth, the sharpest change on the chart, start on that band, because it is where the bottom stops being flat. The 80 ft contour, toward the middle of the lake, encloses under an acre of water, a single pocket rather than a basin, but one worth a drift over in high summer. At 80 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 20–30 ft break at first and last light.

Ice fishing on Mary Lake

Deep water like Mary 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 80 ft hole. That edge is the 20–30 ft band on the chart above, where 14 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.

Mary Lake depth map FAQs

How deep is Mary Lake?: Mary Lake is more than 80 feet deep. The deepest contour in the Michigan DNR Inland Lake Contours survey is the 80 foot line, and the lake continues deeper inside it.
Where is the deepest part of Mary Lake?: The deepest charted water on Mary Lake lies inside the 80 ft contour, toward the middle of the lake. That contour encloses under an acre, under 1% 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 Mary Lake is shallower than 40 feet?: About half. The 40 ft contour encloses 17 acres of the roughly 50 acres inside the outer 10 ft line, so the other half of the water is shallower than 40 feet. The sharpest drop is between 20 and 30 feet, where the mapped water sheds 14 acres.
How accurate is this Mary 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 Mary Lake

Bass Lake depth map · 58 ft max · 14 mi away
Pickerel Lake depth map · 66 ft max · 23 mi away
Stager Lake depth map · 55 ft max · 29 mi away
Second Fortune Lake depth map · 80 ft max · 37 mi away
First Fortune Lake depth map · 70+ ft max · 37 mi away

Mapped fishing venues near Mary Lake

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

Bass Lake · 14 mi away
Pickerel Lake · 23 mi away

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