Indiana lake depth maps
Lower Long Lake depth map
Lower Long Lake in Noble County, Indiana reaches a depth of 50 feet. Lower Long Lake is charted here across 5 closed depth contours, from the 10 ft line down to 50 ft, enclosing about 54 acres of water. Half of that water lies inside the 30 ft line, and only 1.3 acres lie inside the deepest one. Every contour is on the interactive map below, free and without an account.
Data: Indiana DNR Lake Bathymetry (credit: Indiana DNR). Contours closed, checked and area-computed by Jordan Carter, founder of GilledIt · page updated
Lower Long Lake depth chart: 5 depth contours from 10 to 50 ft
Data: Indiana DNR Lake Bathymetry (credit: Indiana DNR), retrieved August 2026 · depths change over time · not for navigation
| Depth contour | Water inside it | Share of mapped water |
|---|---|---|
| 10 ft | 54 acres | 100% |
| 20 ft | 36 acres | 67% |
| 30 ft | 17 acres | 32% |
| 40 ft | 8.5 acres | 16% |
| 50 ft | 1.3 acres | 2.4% |
Acreages are computed from the closed Indiana DNR Lake Bathymetry contour rings, with islands subtracted. Shares are of the 54 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 Lower Long Lake: an evenly graded bottom
About 54 acres of Lower Long Lake sit inside the survey's 10 ft contour, and half of that water is already gone by the 30 ft line: the bottom loses depth gradually and evenly, with no broad shelf and no single abrupt drop. The steepest break on the chart runs from 20 down to 30 ft: 19 acres of bottom fall away across 10 ft there, which makes that band the first contour to work. The deepest 50 ft contour holds 1.3 acres, 2.4% of the mapped water, toward the northern end of the lake. Nothing here reaches a true cold-water layer at 50 ft, so structure does the thermocline's work: the points and inside turns where the 20 and 30 ft lines pinch together fish hardest in early season, and again as fish follow bait back down in autumn.
Ice fishing on Lower Long Lake
At 50 ft, Lower Long 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 50 ft hole, 1.3 acres of it, at first light, then move up onto the 20–30 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.
Lower Long Lake depth map FAQs
- How deep is Lower Long Lake?
- Lower Long Lake reaches a maximum depth of 50 feet in the Indiana DNR Lake Bathymetry survey. Most of it is far shallower: the survey charts 5 closed depth contours over about 54 acres, and half of that water sits inside the 30 ft line.
- Where is the deepest part of Lower Long Lake?
- The deepest charted water on Lower Long Lake lies inside the 50 ft contour, toward the northern end of the lake. That contour encloses 1.3 acres, 2.4% 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 Lower Long Lake is shallower than 30 feet?
- About half. The 30 ft contour encloses 17 acres of the roughly 54 acres inside the outer 10 ft line, so the other half of the water is shallower than 30 feet. The sharpest drop is between 20 and 30 feet, where the mapped water sheds 19 acres.
- How accurate is this Lower Long Lake depth map?
- The contours come from the Indiana DNR Lake Bathymetry 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. Per Indiana DNR, the data are graphical representations for reference only, not a survey instrument. 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 Lower Long Lake
- Williams Lake depth map · 40 ft max · 3 mi away
- Bear Lake depth map · 55 ft max · 4 mi away
- Diamond Lake depth map · 70 ft max · 5 mi away
- Rivir Lake depth map · 35 ft max · 5 mi away
- Smalley Lake depth map · 44 ft max · 6 mi away
Mapped fishing venues near Lower Long Lake
Lower Long Lake in the venue directory covers access and fishing details for this water.
- Williams Lake · 3 mi away
- Bear Lake · 4 mi away
- Diamond Lake · 5 mi away
Fishing in Indiana needs a state license: Indiana fishing license guide · all Indiana venues