Connecticut lake depth maps
West Thompson Reservoir depth map
West Thompson Reservoir in Thompson, Connecticut reaches a depth of 30 feet. West Thompson Reservoir is charted here across 6 closed depth contours, from the 0 ft line down to 25 ft, enclosing about 239 acres of water. Half of that water lies inside the 10 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
West Thompson Reservoir depth chart: 6 depth contours from 0 to 25 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 | 239 acres | 100% |
| 5 ft | 189 acres | 79% |
| 10 ft | 79 acres | 33% |
| 15 ft | 9.9 acres | 4.1% |
| 20 ft | under 1 acre | under 1% |
| 25 ft | under 1 acre | under 1% |
Acreages are computed from the closed CT DEEP Lake Bathymetry contour rings, with islands subtracted. Shares are of the 239 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 30 ft sounding, marked as a point rather than a closed contour, so it is not charted as a band.
Fishing West Thompson Reservoir: an evenly graded bottom
Inside its outermost 0 ft contour the survey charts about 239 acres of West Thompson Reservoir, with the 10 ft line enclosing half of it, so the bottom loses depth gradually and evenly, with no broad shelf and no single abrupt drop. The sharpest change on the chart is between 5 and 10 ft, where the mapped water loses 110 acres in 5 ft of depth, that band is the contour to work first, because it is where the bottom stops being flat. Inside the 25 ft contour there is under an acre of water, toward the southern end of the lake: a single pocket rather than a basin, and worth a drift over in high summer. Nothing here reaches a true cold-water layer at 30 ft, so structure does the thermocline's work: the points and inside turns where the 5 and 10 ft lines pinch together fish hardest in early season, and again as fish follow bait back down in autumn.
Ice fishing on West Thompson Reservoir
At 30 ft, West Thompson Reservoir is a workable ice depth: deep enough to hold fish all winter without the slow freeze-up of a big basin. Start on the 25 ft hole, 0.2 acres of it, at first light, then move up onto the 5–10 ft break as the sun gets up, and fish the flats inside the 10 ft line through the middle of the day. Check ice thickness locally before you walk out.
West Thompson Reservoir depth map FAQs
- How deep is West Thompson Reservoir?
- West Thompson Reservoir reaches a maximum depth of 30 feet in the CT DEEP Lake Bathymetry survey. Most of it is far shallower: the survey charts 6 closed depth contours over about 239 acres, and half of that water sits inside the 10 ft line. The 30 ft figure is a single recorded sounding rather than a closed contour, so the deepest line you can actually trace on the map is 25 ft.
- Where is the deepest part of West Thompson Reservoir?
- The deepest charted water on West Thompson Reservoir lies inside the 25 ft contour, toward the southern end 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 West Thompson Reservoir is shallower than 10 feet?
- About half. The 10 ft contour encloses 79 acres of the roughly 239 acres inside the outer 0 ft line, so the other half of the water is shallower than 10 feet. The sharpest drop is between 5 and 10 feet, where the mapped water sheds 110 acres.
- How accurate is this West Thompson 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 West Thompson Reservoir
- Roseland Lake depth map · 18 ft max · 2 mi away
- Quaddick Reservoir, Lower depth map · 15 ft max · 4 mi away
- Quaddick Reservoir, Middle depth map · 18 ft max · 5 mi away
- Alexander Lake depth map · 48 ft max · 7 mi away
- Black Pond depth map · 21 ft max · 8 mi away
Mapped fishing venues near West Thompson Reservoir
West Thompson Reservoir in the venue directory covers access and fishing details for this water.
- Roseland Lake · 2 mi away
- Quaddick Reservoir, Lower · 4 mi away
- Quasset lake · 4 mi away
Fishing in Connecticut needs a state license: Connecticut fishing license guide · all Connecticut venues