How deep is Long Lake?

Long Lake is more than 45 feet deep. The deepest contour in the Michigan DNR Inland Lake Contours survey is the 45 foot line, and the lake continues deeper inside it, with 10 depth bands mapped in total.

Where is the deepest part of Long Lake?

The deepest surveyed water on Long Lake sits toward the northeastern corner of the lake, inside the 45 ft contour. The interactive depth map above shows the full basin outline and the breaks leading into it.

How accurate is this Long 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

Long Lake depth map

Long Lake in Branch County, Michigan reaches a depth of more than 45 feet at its deepest surveyed contour. The official Michigan survey maps 10 depth bands across 20 contour lines. This free map of Long Lake shows every surveyed contour as an interactive depth chart you can use to plan a session before you travel.

Long Lake depth chart: 10 depth bands to 45+ ft

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

Long Lake depth chart data
Depth contour	Share of mapped area inside it
5 ft	about 100%
10 ft	about 39%
15 ft	about 35%
20 ft	about 29%
25 ft	about 21%
30 ft	about 11%
35 ft	about 4%
40 ft	about 2%
45 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 Long Lake: mid-depth structure water

With 45 feet at its deepest, the fish-holding structure is the mid-depth contour: drop-offs, points and inside turns between the shallows and the basin. Use the 10 mapped depth bands to find where contour lines pinch together, which marks the sharpest breaks, and work those edges first, especially early season and again in the fall as fish follow bait between depths.

Ice fishing on Long Lake

Long Lake is a classic ice-fishing depth: enough water to hold fish all winter without the long freeze-up of a deep basin. Start on the deepest mapped hole at first light, then work the breaks where contour lines tighten. Mid-depth flats near the basin edge produce through midday. Always verify ice thickness locally before walking out.

Long Lake depth map FAQs

How deep is Long Lake?: Long Lake is more than 45 feet deep. The deepest contour in the Michigan DNR Inland Lake Contours survey is the 45 foot line, and the lake continues deeper inside it, with 10 depth bands mapped in total.
Where is the deepest part of Long Lake?: The deepest surveyed water on Long Lake sits toward the northeastern corner of the lake, inside the 45 ft contour. The interactive depth map above shows the full basin outline and the breaks leading into it.
How accurate is this Long 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 Long Lake

Coldwater Lake depth map · 90+ ft max · 2 mi away
Lake of the Woods depth map · 70+ ft max · 4 mi away
Marble Lake depth map · 60+ ft max · 6 mi away
George Lake depth map · 82 ft max · 7 mi away
Hemlock Lake depth map · 60+ ft max · 10 mi away

Mapped fishing venues near Long Lake

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

Coldwater Lake · 2 mi away
Lake of the Woods · 4 mi away
Marble Lake · 6 mi away

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