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Indiana lake depth maps

Ferdinand Old Lake depth map

Ferdinand Old Lake in Dubois County, Indiana reaches a depth of 18 feet. Ferdinand Old Lake is charted here across 9 closed depth contours, from the 2 ft line down to 18 ft, enclosing about 12 acres of water. Half of that water lies inside the 8 ft line, and only under an acre 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

Ferdinand Old Lake depth chart: 9 depth contours from 2 to 18 ft

Data: Indiana DNR Lake Bathymetry (credit: Indiana DNR), retrieved August 2026 · depths change over time · not for navigation

Ferdinand Old Lake depth chart data: water enclosed by each contour
Depth contourWater inside itShare of mapped water
2 ft12 acres100%
4 ft9.2 acres75%
6 ft6.9 acres56%
8 ft4.9 acres40%
10 ft3.6 acres29%
12 ft2.5 acres20%
14 ft1.8 acres15%
16 ftunder 1 acre6.8%
18 ftunder 1 acre1.4%

Acreages are computed from the closed Indiana DNR Lake Bathymetry contour rings, with islands subtracted. Shares are of the 12 acres inside the outermost charted contour (the 2 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 Ferdinand Old Lake: an evenly graded bottom

Inside its outermost 2 ft contour the survey charts about 12 acres of Ferdinand Old Lake, with the 8 ft line enclosing half of it, so the bottom falls away at a steady rate rather than shelving off or dropping in one step. The sharpest change on the chart is between 2 and 4 ft, where the mapped water loses 2.8 acres in 2 ft of depth, that band is the contour to work first, because it is where the bottom stops being flat. The 18 ft contour, toward the northeastern corner of the lake, encloses under an acre of water, a single pocket rather than a basin, but one worth a drift over in high summer. Topping out at 18 ft, weed growth structures this water more than depth does, but the 0.2-acre deep spot still concentrates fish in the heat of summer, and the one-contour depressions on the chart are the ones most anglers row straight over.

Ferdinand Old Lake depth map FAQs

How deep is Ferdinand Old Lake?
Ferdinand Old Lake reaches a maximum depth of 18 feet in the Indiana DNR Lake Bathymetry survey. Most of it is far shallower: the survey charts 9 closed depth contours over about 12 acres, and half of that water sits inside the 8 ft line.
Where is the deepest part of Ferdinand Old Lake?
The deepest charted water on Ferdinand Old Lake lies inside the 18 ft contour, toward the northeastern corner of the lake. That contour encloses under an acre, 1.4% 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 Ferdinand Old Lake is shallower than 8 feet?
About half. The 8 ft contour encloses 4.9 acres of the roughly 12 acres inside the outer 2 ft line, so the other half of the water is shallower than 8 feet. The sharpest drop is between 2 and 4 feet, where the mapped water sheds 2.8 acres.
How accurate is this Ferdinand Old 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 Ferdinand Old Lake

Mapped fishing venues near Ferdinand Old Lake

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

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