How deep is Loon Lake?

Loon Lake is more than 128 feet deep. The deepest contour in the Michigan DNR Inland Lake Contours survey is the 128 foot line, and the lake continues deeper inside it, with 23 depth bands mapped in total.

Where is the deepest part of Loon Lake?

The deepest surveyed water on Loon Lake sits toward the northeastern corner of the lake, inside the 128 ft contour. The interactive depth map above shows the full basin outline and the breaks leading into it.

How accurate is this Loon Lake depth map?

The contours come from the Michigan DNR Inland Lake Contours survey. 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.

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 contour. The official Michigan survey maps 23 depth bands across 45 contour lines. This free map of Loon Lake shows every surveyed contour as an interactive depth chart you can use to plan a session before you travel.

Loon Lake depth chart: 23 depth bands to 128+ ft

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

Loon Lake depth chart data
Depth contour	Share of mapped area inside it
5 ft	about 100%
10 ft	about 42%
20 ft	about 35%
30 ft	about 27%
40 ft	about 21%
50 ft	about 17%
60 ft	about 12%
70 ft	about 6%
80 ft	about 3%
90 ft	about 2%
100 ft	about 1%
120 ft	under 1%

Share of the surveyed surface area enclosed by each depth contour, computed from the Michigan DNR Inland Lake Contours data.

How to fish Loon Lake: deep, two-story water

At 128 feet, this is a two-story fishery: warm-water species work the shallows and weed edges while the deep basin can hold cold-water fish below the summer thermocline. In summer, target the transition where the bottom breaks from the shallow shelf toward the basin; fish suspend along that edge at dawn and dusk. The 23 mapped depth bands make it straightforward to find those breaks before you launch.

Ice fishing on Loon Lake

On deep water like Loon Lake, the winter bite concentrates along the first major drop-off rather than the deepest basin. Use the contours above to find where the shallow shelf breaks toward deep water and set up on that edge; panfish and walleye slide up and down it through the day. Late ice often pushes fish shallower again. Always verify ice thickness locally before walking out, and remember deep lakes freeze later and less evenly than shallow ones.

Loon Lake depth map FAQs

How deep is Loon Lake?: Loon Lake is more than 128 feet deep. The deepest contour in the Michigan DNR Inland Lake Contours survey is the 128 foot line, and the lake continues deeper inside it, with 23 depth bands mapped in total.
Where is the deepest part of Loon Lake?: The deepest surveyed water on Loon Lake sits toward the northeastern corner of the lake, inside the 128 ft contour. The interactive depth map above shows the full basin outline and the breaks leading into it.
How accurate is this Loon Lake depth map?: The contours come from the Michigan DNR Inland Lake Contours survey. 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.

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