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Connecticut lake depth maps

Mansfield Hollow Reservoir depth map

Mansfield Hollow Reservoir in Mansfield, Connecticut reaches a depth of 21 feet. Mansfield Hollow Reservoir is charted here across 5 closed depth contours, from the 0 ft line down to 18 ft, enclosing about 461 acres of water. Half of that water lies inside the 6 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: CT DEEP Lake Bathymetry (CC0). Contours closed, checked and area-computed by Jordan Carter, founder of GilledIt · page updated

Mansfield Hollow Reservoir depth chart: 5 depth contours from 0 to 18 ft

Data: CT DEEP Lake Bathymetry (CC0), retrieved August 2026 · depths change over time · not for navigation

Mansfield Hollow Reservoir depth chart data: water enclosed by each contour
Depth contourWater inside itShare of mapped water
0 ft461 acres100%
6 ft116 acres25%
9 ft18 acres3.9%
12 ftunder 1 acreunder 1%
18 ftunder 1 acreunder 1%

Acreages are computed from the closed CT DEEP Lake Bathymetry contour rings, with islands subtracted. Shares are of the 461 acres inside the outermost charted contour (the 0 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. The survey also records a 21 ft sounding, marked as a point rather than a closed contour, so it is not charted as a band.

Fishing Mansfield Hollow Reservoir: an evenly graded bottom

Inside its outermost 0 ft contour the survey charts about 461 acres of Mansfield Hollow Reservoir, with the 6 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 0 and 6 ft, where the mapped water loses 345 acres in 6 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 21 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.

Ice fishing on Mansfield Hollow Reservoir

A shallow lake like Mansfield Hollow Reservoir is usually among the first to make safe ice, and once the weed beds die back the fish have very little deep water to spread into: just 0.2 acres inside the 18 ft contour. Start there, then hunt the subtle single-contour depressions across the 461-acre basin. Check ice thickness locally before you walk out.

Mansfield Hollow Reservoir depth map FAQs

How deep is Mansfield Hollow Reservoir?
Mansfield Hollow Reservoir reaches a maximum depth of 21 feet in the CT DEEP Lake Bathymetry survey. Most of it is far shallower: the survey charts 5 closed depth contours over about 461 acres, and half of that water sits inside the 6 ft line. The 21 ft figure is a single recorded sounding rather than a closed contour, so the deepest line you can actually trace on the map is 18 ft.
Where is the deepest part of Mansfield Hollow Reservoir?
The deepest charted water on Mansfield Hollow Reservoir lies inside the 18 ft contour, toward the northeastern corner of the lake. That contour encloses under an acre, under 1% 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 Mansfield Hollow Reservoir is shallower than 6 feet?
About half. The 6 ft contour encloses 116 acres of the roughly 461 acres inside the outer 0 ft line, so the other half of the water is shallower than 6 feet. The sharpest drop is between 0 and 6 feet, where the mapped water sheds 345 acres.
How accurate is this Mansfield Hollow Reservoir depth map?
The contours come from the CT DEEP 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. 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 Mansfield Hollow Reservoir

Mapped fishing venues near Mansfield Hollow Reservoir

Mansfield Hollow Reservoir in the venue directory covers access and fishing details for this water.

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