Connecticut lake depth maps
Colebrook River Reservoir depth map
Colebrook River Reservoir in Colebrook, Connecticut reaches a depth of 130 feet. Colebrook River Reservoir is charted here across 14 closed depth contours, from the 0 ft line down to 130 ft, enclosing about 831 acres of water. Half of that water lies inside the 60 ft line, and only 26 acres 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
Colebrook River Reservoir depth chart: 14 depth contours from 0 to 130 ft
Data: CT DEEP Lake Bathymetry (CC0), retrieved August 2026 · depths change over time · not for navigation
| Depth contour | Water inside it | Share of mapped water |
|---|---|---|
| 0 ft | 831 acres | 100% |
| 10 ft | 714 acres | 86% |
| 20 ft | 625 acres | 75% |
| 30 ft | 553 acres | 67% |
| 40 ft | 495 acres | 60% |
| 50 ft | 441 acres | 53% |
| 60 ft | 384 acres | 46% |
| 70 ft | 330 acres | 40% |
| 80 ft | 284 acres | 34% |
| 90 ft | 231 acres | 28% |
| 100 ft | 179 acres | 22% |
| 110 ft | 119 acres | 14% |
| 120 ft | 77 acres | 9.3% |
| 130 ft | 26 acres | 3.1% |
Acreages are computed from the closed CT DEEP Lake Bathymetry contour rings, with islands subtracted. Shares are of the 831 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.
Fishing Colebrook River Reservoir: a stepped drop into deep water
Inside its outermost 0 ft contour the survey charts about 831 acres of Colebrook River Reservoir, with the 60 ft line enclosing half of it, so the bottom steps down contour by contour into the deep basin rather than shelving flat or plunging all at once. The sharpest change on the chart is between 0 and 10 ft, where the mapped water loses 117 acres in 10 ft of depth, that band is the contour to work first, because it is where the bottom stops being flat. 26 acres, 3.1% of the mapped water, lie inside the deepest 130 ft contour, toward the southeastern corner of the lake. At 130 ft this is two-story water: the basin can stay cold below the summer thermocline while warm-water fish stay up on the 0-to-60 ft ground, and the fish that move between the two do it along the 0–10 ft break at first and last light.
Ice fishing on Colebrook River Reservoir
Deep water like Colebrook River Reservoir freezes later and less evenly than the shallow lakes around it, and the winter bite sets up on the first real break, not out over the 130 ft hole. That edge is the 0–10 ft band on the chart above, where 117 acres of bottom tilt away, and panfish and walleye work up and down it through the day. By late ice the fish push back onto the 0-to-60 ft flat. Check ice thickness locally before you walk out.
Colebrook River Reservoir depth map FAQs
- How deep is Colebrook River Reservoir?
- Colebrook River Reservoir reaches a maximum depth of 130 feet in the CT DEEP Lake Bathymetry survey. Most of it is far shallower: the survey charts 14 closed depth contours over about 831 acres, and half of that water sits inside the 60 ft line.
- Where is the deepest part of Colebrook River Reservoir?
- The deepest charted water on Colebrook River Reservoir lies inside the 130 ft contour, toward the southeastern corner of the lake. That contour encloses 26 acres, 3.1% of the mapped water, so it is a small target on a big lake, the depth chart above gives the contour to line up on.
- How much of Colebrook River Reservoir is shallower than 60 feet?
- About half. The 60 ft contour encloses 384 acres of the roughly 831 acres inside the outer 0 ft line, so the other half of the water is shallower than 60 feet. The sharpest drop is between 0 and 10 feet, where the mapped water sheds 117 acres.
- How accurate is this Colebrook River 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 Colebrook River Reservoir
- West Branch Reservoir depth map · 90 ft max · 3 mi away
- Highland Lake depth map · 60 ft max · 9 mi away
- Winchester Lake depth map · 16 ft max · 10 mi away
- McDonough Lake depth map · 50 ft max · 10 mi away
- West Hill Pond depth map · 60 ft max · 10 mi away
Mapped fishing venues near Colebrook River Reservoir
Colebrook River Reservoir in the venue directory covers access and fishing details for this water.
- West Branch Reservoir · 3 mi away
- Highland Lake · 9 mi away
- Winchester Lake · 10 mi away
Fishing in Connecticut needs a state license: Connecticut fishing license guide · all Connecticut venues