Michigan lake depth maps
Long Lake depth map
Long Lake in Clare County, Michigan reaches a depth of 76 feet. Long Lake is charted here across 7 closed depth contours, from the 10 ft line down to 70 ft, enclosing about 239 acres of water. Half of that water lies inside the 20 ft line, and only 1.4 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
Long 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
| Depth contour | Water inside it | Share of mapped water |
|---|---|---|
| 10 ft | 239 acres | 100% |
| 20 ft | 117 acres | 49% |
| 30 ft | 61 acres | 26% |
| 40 ft | 26 acres | 11% |
| 50 ft | 13 acres | 5.3% |
| 60 ft | 5.6 acres | 2.3% |
| 70 ft | 1.4 acres | under 1% |
Acreages are computed from the closed Michigan DNR Inland Lake Contours contour rings, with islands subtracted. Shares are of the 239 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. The survey also records a 76 ft sounding, marked as a point rather than a closed contour, so it is not charted as a band.
Fishing Long Lake: a wide shallow flat over a deep hole
About 239 acres of Long Lake sit inside the survey's 10 ft contour, and half of that water is already gone by the 20 ft line: the bulk of this Clare County water sits on a shallow flat, with the real depth packed into one part of the basin. The steepest break on the chart runs from 10 down to 20 ft: 122 acres of bottom fall away across 10 ft there, which makes that band the first contour to work. The deepest 70 ft contour holds 1.4 acres, under 1% of the mapped water, toward the eastern side of the lake. 76 ft of water makes this a two-story fishery: warm-water fish hold the 10-to-20 ft ground while the basin can stay cold below the summer thermocline, and the traffic between the two runs along the 10–20 ft break at first and last light.
Ice fishing on Long Lake
Long Lake freezes later and less evenly than the shallow waters around it, and the winter bite sets up on the first real break rather than out over the 70 ft hole. The 10–20 ft band on the chart above is that edge: 122 acres of bottom tilt away there, and panfish and walleye slide up and down it through the day. Late ice pushes fish back onto the 10-to-20 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 76 feet in the Michigan DNR Inland Lake Contours survey. Most of it is far shallower: the survey charts 7 closed depth contours over about 239 acres, and half of that water sits inside the 20 ft line. The 76 ft figure is a single recorded sounding rather than a closed contour, so the deepest line you can actually trace on the map is 70 ft.
- Where is the deepest part of Long Lake?
- The deepest charted water on Long Lake lies inside the 70 ft contour, toward the eastern side of the lake. That contour encloses 1.4 acres, 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 Long Lake is shallower than 20 feet?
- About half. The 20 ft contour encloses 117 acres of the roughly 239 acres inside the outer 10 ft line, so the other half of the water is shallower than 20 feet. The sharpest drop is between 10 and 20 feet, where the mapped water sheds 122 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
- Arnold Lake depth map · 80+ ft max · 2 mi away
- Little Long Lake depth map · 60+ ft max · 5 mi away
- Windover Lake depth map · 60+ ft max · 15 mi away
- Five Lakes depth map · 60+ ft max · 15 mi away
- Silver Lake depth map · 52+ ft max · 15 mi away
Mapped fishing venues near Long Lake
Long Lake in the venue directory covers access and fishing details for this water.
- Arnold Lake · 2 mi away
- Little Long Lake · 5 mi away
- Windover Lake · 15 mi away
Fishing in Michigan needs a state license: Michigan fishing license guide · all Michigan venues