How deep is Round Lake?

Round Lake is more than 55 feet deep. The deepest contour in the Michigan DNR Inland Lake Contours survey is the 55 foot line, and the lake continues deeper inside it.

Where is the deepest part of Round Lake?

The deepest charted water on Round Lake lies inside the 55 ft contour, toward the southwestern corner 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 Round Lake is shallower than 25 feet?

About half. The 25 ft contour encloses 160 acres of the roughly 331 acres inside the outer 10 ft line, so the other half of the water is shallower than 25 feet. The sharpest drop is between 20 and 25 feet, where the mapped water sheds 64 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.

Michigan lake depth maps

Round Lake depth map

Round Lake in Delta County, Michigan reaches a depth of more than 55 feet at its deepest surveyed contour. Round Lake is charted here across 10 closed depth contours, from the 10 ft line down to 55 ft, enclosing about 331 acres of water. Half of that water lies inside the 25 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

Round Lake depth chart: 10 depth contours from 10 to 55 ft

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

Round Lake depth chart data: water enclosed by each contour
Depth contour	Water inside it	Share of mapped water
10 ft	331 acres	100%
15 ft	287 acres	87%
20 ft	224 acres	68%
25 ft	160 acres	48%
30 ft	105 acres	32%
35 ft	60 acres	18%
40 ft	35 acres	11%
45 ft	18 acres	5.3%
50 ft	5.6 acres	1.7%
55 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 331 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 Round Lake: an evenly graded bottom

Inside its outermost 10 ft contour the survey charts about 331 acres of Round Lake, with the 25 ft line enclosing half of it, so the bottom loses depth gradually and evenly, with no broad shelf and no single abrupt drop. The sharpest change on the chart is between 20 and 25 ft, where the mapped water loses 64 acres in 5 ft of depth, that band is the contour to work first, because it is where the bottom stops being flat. Inside the 55 ft contour there is under an acre of water, toward the southwestern corner of the lake: a single pocket rather than a basin, and worth a drift over in high summer. Nothing here reaches a true cold-water layer at 55 ft, so structure does the thermocline's work: the points and inside turns where the 20 and 25 ft lines pinch together fish hardest in early season, and again as fish follow bait back down in autumn.

Ice fishing on Round Lake

At 55 ft, Round Lake is a workable ice depth: deep enough to hold fish all winter without the slow freeze-up of a big basin. Start on the 55 ft hole, 0.2 acres of it, at first light, then move up onto the 20–25 ft break as the sun gets up, and fish the flats inside the 25 ft line through the middle of the day. Check ice thickness locally before you walk out.

Round Lake depth map FAQs

How deep is Round Lake?: Round Lake is more than 55 feet deep. The deepest contour in the Michigan DNR Inland Lake Contours survey is the 55 foot line, and the lake continues deeper inside it.
Where is the deepest part of Round Lake?: The deepest charted water on Round Lake lies inside the 55 ft contour, toward the southwestern corner 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 Round Lake is shallower than 25 feet?: About half. The 25 ft contour encloses 160 acres of the roughly 331 acres inside the outer 10 ft line, so the other half of the water is shallower than 25 feet. The sharpest drop is between 20 and 25 feet, where the mapped water sheds 64 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

McKeever Lake depth map · 65 ft max · 8 mi away
Steuben Lake depth map · 55+ ft max · 16 mi away
Clear Lake depth map · 50+ ft max · 17 mi away
Island Lake depth map · 60+ ft max · 22 mi away
Dodge Lake depth map · 55+ ft max · 23 mi away

Mapped fishing venues near Round Lake

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

McKeever Lake · 8 mi away
Steuben Lake · 16 mi away
Clear Lake · 17 mi away

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