Michigan lake depth maps
Round Lake depth map
Round Lake in Lenawee County, Michigan reaches a depth of 67 feet. Round Lake is charted here across 7 closed depth contours, from the 5 ft line down to 60 ft, enclosing about 289 acres of water. Half of that water lies inside the 40 ft line, and only 23 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
Round Lake depth chart: 7 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
| Depth contour | Water inside it | Share of mapped water |
|---|---|---|
| 5 ft | 289 acres | 100% |
| 10 ft | 285 acres | 99% |
| 20 ft | 201 acres | 70% |
| 30 ft | 181 acres | 63% |
| 40 ft | 135 acres | 47% |
| 50 ft | 76 acres | 26% |
| 60 ft | 23 acres | 8.1% |
Acreages are computed from the closed Michigan DNR Inland Lake Contours contour rings, with islands subtracted. Shares are of the 289 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 67 ft sounding, marked as a point rather than a closed contour, so it is not charted as a band.
Fishing Round Lake: steep walls and a big basin
Inside its outermost 5 ft contour the survey charts about 289 acres of Round Lake, with the 40 ft line enclosing half of it, so depth comes quickly here, with no long shallow margin before the bottom drops away. The sharpest change on the chart is between 10 and 20 ft, where the mapped water loses 84 acres in 10 ft of depth, that band is the contour to work first, because it is where the bottom stops being flat. The deepest 60 ft contour holds 23 acres, 8.1% of the mapped water, toward the middle of the lake. 67 ft of water makes this a two-story fishery: warm-water fish hold the 5-to-40 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 Round Lake
Round 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 60 ft hole. The 10–20 ft band on the chart above is that edge: 84 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 5-to-40 ft flat. Check ice thickness locally before you walk out.
Round Lake depth map FAQs
- How deep is Round Lake?
- Round Lake reaches a maximum depth of 67 feet in the Michigan DNR Inland Lake Contours survey. Most of it is far shallower: the survey charts 7 closed depth contours over about 289 acres, and half of that water sits inside the 40 ft line. The 67 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 Round Lake?
- The deepest charted water on Round Lake lies inside the 60 ft contour, toward the middle of the lake. That contour encloses 23 acres, 8.1% 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 Round Lake is shallower than 40 feet?
- About half. The 40 ft contour encloses 135 acres of the roughly 289 acres inside the outer 5 ft line, so the other half of the water is shallower than 40 feet. The sharpest drop is between 10 and 20 feet, where the mapped water sheds 84 acres.
- How accurate is this Round 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 Round Lake
- Devils Lake depth map · 63 ft max · 2 mi away
- Silver Lake depth map · 26 ft max · 6 mi away
- Allen Lake depth map · 75 ft max · 8 mi away
- Wamplers Lake depth map · 39 ft max · 10 mi away
- Farewell Lake depth map · 43+ ft max · 14 mi away
Mapped fishing venues near Round Lake
Round Lake in the venue directory covers access and fishing details for this water.
- Devils Lake · 2 mi away
- Silver Lake · 6 mi away
- Allen Lake · 8 mi away
Fishing in Michigan needs a state license: Michigan fishing license guide · all Michigan venues