How deep is Long Lake?

Long Lake reaches a maximum depth of 61 feet in the Michigan DNR Inland Lake Contours survey. Most of it is far shallower: the survey charts 12 closed depth contours over about 364 acres, and half of that water sits inside the 25 ft line. The 61 ft figure is a single recorded sounding rather than a closed contour, so the deepest line you can actually trace on the map is 60 ft.

Where is the deepest part of Long Lake?

The deepest charted water on Long Lake lies inside the 60 ft contour, toward the eastern side of the lake. That contour encloses 11 acres, 2.9% 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 Long Lake is shallower than 25 feet?

About half. The 25 ft contour encloses 178 acres of the roughly 364 acres inside the outer 5 ft line, so the other half of the water is shallower than 25 feet. The sharpest drop is between 15 and 20 feet, where the mapped water sheds 59 acres.

How accurate is this Long 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

Long Lake depth map

Long Lake in Cheboygan County, Michigan reaches a depth of 61 feet. Long Lake is charted here across 12 closed depth contours, from the 5 ft line down to 60 ft, enclosing about 364 acres of water. Half of that water lies inside the 25 ft line, and only 11 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

Long Lake depth chart: 12 depth contours from 5 to 60 ft

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

Long Lake depth chart data: water enclosed by each contour
Depth contour	Water inside it	Share of mapped water
5 ft	364 acres	100%
10 ft	329 acres	91%
15 ft	292 acres	80%
20 ft	233 acres	64%
25 ft	178 acres	49%
30 ft	132 acres	36%
35 ft	98 acres	27%
40 ft	84 acres	23%
45 ft	66 acres	18%
50 ft	41 acres	11%
55 ft	24 acres	6.5%
60 ft	11 acres	2.9%

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 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 61 ft sounding, marked as a point rather than a closed contour, so it is not charted as a band.

Fishing Long Lake: a stepped drop into deep water

About 364 acres of Long Lake sit inside the survey's 5 ft contour, and half of that water is already gone by the 25 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 15 down to 20 ft: 59 acres of bottom fall away across 5 ft there, which makes that band the first contour to work. 11 acres, 2.9% of the mapped water, lie inside the deepest 60 ft contour, toward the eastern side of the lake. At 61 ft this is two-story water: the basin can stay cold below the summer thermocline while warm-water fish stay up on the 5-to-25 ft ground, and the fish that move between the two do it along the 15–20 ft break at first and last light.

Ice fishing on Long Lake

Deep water like Long 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 60 ft hole. That edge is the 15–20 ft band on the chart above, where 59 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 5-to-25 ft flat. Check ice thickness locally before you walk out.

Long Lake depth map FAQs

How deep is Long Lake?: Long Lake reaches a maximum depth of 61 feet in the Michigan DNR Inland Lake Contours survey. Most of it is far shallower: the survey charts 12 closed depth contours over about 364 acres, and half of that water sits inside the 25 ft line. The 61 ft figure is a single recorded sounding rather than a closed contour, so the deepest line you can actually trace on the map is 60 ft.
Where is the deepest part of Long Lake?: The deepest charted water on Long Lake lies inside the 60 ft contour, toward the eastern side of the lake. That contour encloses 11 acres, 2.9% 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 Long Lake is shallower than 25 feet?: About half. The 25 ft contour encloses 178 acres of the roughly 364 acres inside the outer 5 ft line, so the other half of the water is shallower than 25 feet. The sharpest drop is between 15 and 20 feet, where the mapped water sheds 59 acres.
How accurate is this Long 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 Long Lake

Twin Lakes depth map · 73+ ft max · 5 mi away
Mullett Lake depth map · 120 ft max · 7 mi away
Black Lake depth map · 50 ft max · 8 mi away
Burt Lake depth map · 73 ft max · 14 mi away
Douglas Lake depth map · 80+ ft max · 14 mi away

Mapped fishing venues near Long Lake

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

Twin Lakes · 5 mi away
Mullett Lake · 7 mi away
Black Lake · 8 mi away

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