How deep is Long Lake?

Long Lake reaches a maximum depth of 35 feet, according to the Indiana DNR Lake Bathymetry survey. Most of the lake is shallower, with 7 mapped depth bands between the shoreline and the deepest hole.

Where is the deepest part of Long Lake?

The deepest surveyed water on Long Lake sits toward the southern end of the lake, inside the 35 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 Indiana DNR Lake Bathymetry 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. Per Indiana DNR, the data are graphical representations for reference only, not a survey instrument.

Indiana lake depth maps

Long Lake depth map

Long Lake in STEUBEN County, Indiana reaches a depth of 35 feet. The official Indiana survey maps 7 depth bands across 17 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: 7 depth bands to 35 ft

Data: Indiana DNR Lake Bathymetry (credit: Indiana DNR), 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 77%
15 ft	about 57%
20 ft	about 26%
25 ft	about 20%
30 ft	about 3%
35 ft	under 1%

Share of the surveyed surface area enclosed by each depth contour, computed from the Indiana DNR Lake Bathymetry data.

How to fish Long Lake: mid-depth structure water

With 35 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 7 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 reaches a maximum depth of 35 feet, according to the Indiana DNR Lake Bathymetry survey. Most of the lake is shallower, with 7 mapped depth bands between the shoreline and the deepest hole.
Where is the deepest part of Long Lake?: The deepest surveyed water on Long Lake sits toward the southern end of the lake, inside the 35 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 Indiana DNR Lake Bathymetry 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. Per Indiana DNR, the data are graphical representations for reference only, not a survey instrument.

Depth maps for lakes near Long Lake

Gentian/failing Lake depth map · 45 ft max · 10 mi away
Lake James depth map · 83 ft max · 12 mi away
Barton Lake depth map · 30 ft max · 13 mi away
Buck Lake depth map · 41 ft max · 14 mi away
Bell Lake depth map · 25 ft max · 14 mi away

Mapped fishing venues near Long Lake

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

Gentian/failing Lake · 10 mi away
Lake James · 12 mi away
Barton Lake · 13 mi away

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