Michigan lake depth maps
Loon Lake depth map
Loon Lake in Iosco County, Michigan reaches a depth of more than 128 feet at its deepest surveyed sounding. Loon Lake is charted here across 12 closed depth contours, from the 10 ft line down to 120 ft, enclosing about 294 acres of water. Half of that water lies inside the 50 ft line, and only 1.8 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
Loon Lake depth chart: 12 depth contours from 10 to 120 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 | 294 acres | 100% |
| 20 ft | 246 acres | 84% |
| 30 ft | 199 acres | 68% |
| 40 ft | 160 acres | 54% |
| 50 ft | 128 acres | 44% |
| 60 ft | 90 acres | 31% |
| 70 ft | 42 acres | 14% |
| 80 ft | 26 acres | 8.9% |
| 90 ft | 15 acres | 5.3% |
| 100 ft | 8.9 acres | 3% |
| 110 ft | 5.1 acres | 1.7% |
| 120 ft | 1.8 acres | under 1% |
Acreages are computed from the closed Michigan DNR Inland Lake Contours contour rings, with islands subtracted. Shares are of the 294 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 128 ft sounding, marked as a point rather than a closed contour, so it is not charted as a band.
Fishing Loon Lake: a stepped drop into deep water
About 294 acres of Loon Lake sit inside the survey's 10 ft contour, and half of that water is already gone by the 50 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 10 down to 20 ft: 48 acres of bottom fall away across 10 ft there, which makes that band the first contour to work. 1.8 acres, under 1% of the mapped water, lie inside the deepest 120 ft contour, toward the northeastern corner of the lake. At 128 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-50 ft ground, and the fish that move between the two do it along the 10–20 ft break at first and last light.
Ice fishing on Loon Lake
Deep water like Loon 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 120 ft hole. That edge is the 10–20 ft band on the chart above, where 48 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-50 ft flat. Check ice thickness locally before you walk out.
Loon Lake depth map FAQs
- How deep is Loon Lake?
- Loon Lake is at least 128 feet deep. That figure is the deepest surveyed sounding in the Michigan DNR Inland Lake Contours survey, a point measurement rather than a closed contour, so the deepest line you can actually trace on the map is the 120 ft contour, and the water may run deeper still.
- Where is the deepest part of Loon Lake?
- The deepest charted water on Loon Lake lies inside the 120 ft contour, toward the northeastern corner of the lake. That contour encloses 1.8 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 Loon Lake is shallower than 50 feet?
- About half. The 50 ft contour encloses 128 acres of the roughly 294 acres inside the outer 10 ft line, so the other half of the water is shallower than 50 feet. The sharpest drop is between 10 and 20 feet, where the mapped water sheds 48 acres.
- How accurate is this Loon 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 Loon Lake
- Long Lake depth map · 62 ft max · 2 mi away
- Sage Lake depth map · 80 ft max · 7 mi away
- Rifle Lake depth map · 70+ ft max · 8 mi away
- Grousehaven Lake depth map · 54 ft max · 10 mi away
- Devoe Lake depth map · 53 ft max · 10 mi away
Mapped fishing venues near Loon Lake
Loon Lake in the venue directory covers access and fishing details for this water.
- Long Lake · 2 mi away
- Sage Lake · 7 mi away
- Rifle Lake · 8 mi away
Fishing in Michigan needs a state license: Michigan fishing license guide · all Michigan venues