How deep is Algonquin Lake?

Algonquin Lake is at least 45 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 40 ft contour, and the water may run deeper still.

Where is the deepest part of Algonquin Lake?

The deepest charted water on Algonquin Lake lies inside the 40 ft contour, toward the middle of the lake. That contour encloses 6.1 acres, 7.8% 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 Algonquin Lake is shallower than 30 feet?

About half. The 30 ft contour encloses 23 acres of the roughly 78 acres inside the outer 5 ft line, so the other half of the water is shallower than 30 feet. The sharpest drop is between 15 and 20 feet, where the mapped water sheds 13 acres.

How accurate is this Algonquin 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

Algonquin Lake depth map

Algonquin Lake in Barry County, Michigan reaches a depth of more than 45 feet at its deepest surveyed sounding. Algonquin Lake is charted here across 5 closed depth contours, from the 5 ft line down to 40 ft, enclosing about 78 acres of water. Half of that water lies inside the 30 ft line, and only 6.1 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

Algonquin Lake depth chart: 5 depth contours from 5 to 40 ft

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

Algonquin Lake depth chart data: water enclosed by each contour
Depth contour	Water inside it	Share of mapped water
5 ft	78 acres	100%
15 ft	62 acres	80%
20 ft	49 acres	62%
30 ft	23 acres	30%
40 ft	6.1 acres	7.8%

Acreages are computed from the closed Michigan DNR Inland Lake Contours contour rings, with islands subtracted. Shares are of the 78 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 45 ft sounding, marked as a point rather than a closed contour, so it is not charted as a band.

Fishing Algonquin Lake: steep sides for its size

The survey encloses about 78 acres of Algonquin Lake inside its 5 ft contour, and half of that water lies inside the 30 ft line, so depth comes quickly here, with no long shallow margin before the bottom drops away. Between 15 and 20 ft the mapped water sheds 13 acres in 5 ft of depth, the sharpest change on the chart, start on that band, because it is where the bottom stops being flat. The deepest 40 ft contour holds 6.1 acres, 7.8% of the mapped water, toward the middle of the lake. Nothing here reaches a true cold-water layer at 45 ft, so structure does the thermocline's work: the points and inside turns where the 15 and 20 ft lines pinch together fish hardest in early season, and again as fish follow bait back down in autumn.

Ice fishing on Algonquin Lake

At 45 ft, Algonquin 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 40 ft hole, 6.1 acres of it, at first light, then move up onto the 15–20 ft break as the sun gets up, and fish the flats inside the 30 ft line through the middle of the day. Check ice thickness locally before you walk out.

Algonquin Lake depth map FAQs

How deep is Algonquin Lake?: Algonquin Lake is at least 45 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 40 ft contour, and the water may run deeper still.
Where is the deepest part of Algonquin Lake?: The deepest charted water on Algonquin Lake lies inside the 40 ft contour, toward the middle of the lake. That contour encloses 6.1 acres, 7.8% 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 Algonquin Lake is shallower than 30 feet?: About half. The 30 ft contour encloses 23 acres of the roughly 78 acres inside the outer 5 ft line, so the other half of the water is shallower than 30 feet. The sharpest drop is between 15 and 20 feet, where the mapped water sheds 13 acres.
How accurate is this Algonquin 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 Algonquin Lake

Sugarbush Lake depth map · 93 ft max · 5 mi away
Barlow Lake depth map · 60+ ft max · 9 mi away
Wilkinson Lake depth map · 45+ ft max · 11 mi away
Gun Lake depth map · 68 ft max · 11 mi away
Green Lake depth map · 60+ ft max · 14 mi away

Mapped fishing venues near Algonquin Lake

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

Sugarbush Lake · 5 mi away
Barlow Lake · 9 mi away
Wilkinson Lake · 11 mi away

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