How deep is Diamond Lake?

Diamond Lake reaches a maximum depth of 70 feet in the Indiana DNR Lake Bathymetry survey. Most of it is far shallower: the survey charts 7 closed depth contours over about 76 acres, and half of that water sits inside the 30 ft line.

Where is the deepest part of Diamond Lake?

The deepest charted water on Diamond Lake lies inside the 70 ft contour, toward the southwestern corner of the lake. That contour encloses 2.2 acres, 2.9% 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 Diamond Lake is shallower than 30 feet?

About half. The 30 ft contour encloses 36 acres of the roughly 76 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 24 acres.

How accurate is this Diamond 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.

Indiana lake depth maps

Diamond Lake depth map

Diamond Lake in Noble County, Indiana reaches a depth of 70 feet. Diamond Lake is charted here across 7 closed depth contours, from the 10 ft line down to 70 ft, enclosing about 76 acres of water. Half of that water lies inside the 30 ft line, and only 2.2 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 August 19, 2026

Diamond Lake depth chart: 7 depth contours from 10 to 70 ft

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

Diamond Lake depth chart data: water enclosed by each contour
Depth contour	Water inside it	Share of mapped water
10 ft	76 acres	100%
20 ft	60 acres	79%
30 ft	36 acres	47%
40 ft	20 acres	27%
50 ft	8.6 acres	11%
60 ft	5.1 acres	6.7%
70 ft	2.2 acres	2.9%

Acreages are computed from the closed Indiana DNR Lake Bathymetry contour rings, with islands subtracted. Shares are of the 76 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 Diamond Lake: a stepped drop into deep water

Inside its outermost 10 ft contour the survey charts about 76 acres of Diamond Lake, with the 30 ft line enclosing half of it, so the drop to the deep basin comes in stages, each contour giving up another slice of water, rather than in one abrupt wall. The sharpest change on the chart is between 20 and 30 ft, where the mapped water loses 24 acres in 10 ft of depth, that band is the contour to work first, because it is where the bottom stops being flat. The deepest 70 ft contour holds 2.2 acres, 2.9% of the mapped water, toward the southwestern corner of the lake. 70 ft of water makes this a two-story fishery: warm-water fish hold the 10-to-30 ft ground while the basin can stay cold below the summer thermocline, and the traffic between the two runs along the 20–30 ft break at first and last light.

Ice fishing on Diamond Lake

Diamond Lake freezes later and less evenly than the shallow waters around it, and the winter bite sets up on the first real break rather than out over the 70 ft hole. The 20–30 ft band on the chart above is that edge: 24 acres of bottom tilt away there, and panfish and walleye slide up and down it through the day. Late ice pushes fish back onto the 10-to-30 ft flat. Check ice thickness locally before you walk out.

Diamond Lake depth map FAQs

How deep is Diamond Lake?: Diamond Lake reaches a maximum depth of 70 feet in the Indiana DNR Lake Bathymetry survey. Most of it is far shallower: the survey charts 7 closed depth contours over about 76 acres, and half of that water sits inside the 30 ft line.
Where is the deepest part of Diamond Lake?: The deepest charted water on Diamond Lake lies inside the 70 ft contour, toward the southwestern corner of the lake. That contour encloses 2.2 acres, 2.9% 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 Diamond Lake is shallower than 30 feet?: About half. The 30 ft contour encloses 36 acres of the roughly 76 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 24 acres.
How accurate is this Diamond 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 Diamond Lake

Lower Long Lake depth map · 50 ft max · 5 mi away
Village Lake depth map · 21 ft max · 8 mi away
Duely Lake depth map · 18 ft max · 8 mi away
Williams Lake depth map · 40 ft max · 8 mi away
Bear Lake depth map · 55 ft max · 8 mi away

Mapped fishing venues near Diamond Lake

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

Lower Long Lake · 5 mi away
Village Lake · 8 mi away
Duely Lake · 8 mi away

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