How deep is Mashapaug Lake?

Mashapaug Lake reaches a maximum depth of 35 feet, according to the CT DEEP Lake Bathymetry survey. Most of the lake is shallower, with 7 mapped depth bands between the shoreline and the deepest hole.

Where is the deepest part of Mashapaug Lake?

The deepest surveyed water on Mashapaug Lake sits toward the southern end of the lake, inside the 35 ft contour. The interactive depth map above shows the full basin outline and the breaks leading into it.

How accurate is this Mashapaug Lake depth map?

The contours come from the CT DEEP Lake Bathymetry survey. 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.

Connecticut lake depth maps

Mashapaug Lake depth map

Mashapaug Lake in Union, Connecticut reaches a depth of 35 feet. The official Connecticut survey maps 7 depth bands across 79 contour lines. This free map of Mashapaug Lake shows every surveyed contour as an interactive depth chart you can use to plan a session before you travel.

Mashapaug Lake depth chart: 7 depth bands to 35 ft

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

Mashapaug Lake depth chart data
Depth contour	Share of mapped area inside it
5 ft	about 100%
10 ft	about 65%
25 ft	about 33%
35 ft	under 1%

Share of the surveyed surface area enclosed by each depth contour, computed from the CT DEEP Lake Bathymetry data.

How to fish Mashapaug Lake: mid-depth structure water

With 35 feet at its deepest, the fish-holding structure is the mid-depth contour: drop-offs, points and inside turns between the shallows and the basin. Use the 7 mapped depth bands to find where contour lines pinch together, which marks the sharpest breaks, and work those edges first, especially early season and again in the fall as fish follow bait between depths.

Ice fishing on Mashapaug Lake

Mashapaug Lake is a classic ice-fishing depth: enough water to hold fish all winter without the long freeze-up of a deep basin. Start on the deepest mapped hole at first light, then work the breaks where contour lines tighten. Mid-depth flats near the basin edge produce through midday. Always verify ice thickness locally before walking out.

Mashapaug Lake depth map FAQs

How deep is Mashapaug Lake?: Mashapaug Lake reaches a maximum depth of 35 feet, according to the CT DEEP Lake Bathymetry survey. Most of the lake is shallower, with 7 mapped depth bands between the shoreline and the deepest hole.
Where is the deepest part of Mashapaug Lake?: The deepest surveyed water on Mashapaug Lake sits toward the southern end of the lake, inside the 35 ft contour. The interactive depth map above shows the full basin outline and the breaks leading into it.
How accurate is this Mashapaug Lake depth map?: The contours come from the CT DEEP Lake Bathymetry survey. 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.

Depth maps for lakes near Mashapaug Lake

Bigelow Pond depth map · 15 ft max · 2 mi away
Black Pond depth map · 21 ft max · 5 mi away
Roseland Lake depth map · 18 ft max · 10 mi away
West Thompson Reservoir depth map · 30 ft max · 12 mi away
Crystal Lake depth map · 42 ft max · 14 mi away

Mapped fishing venues near Mashapaug Lake

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

Bigelow Pond · 2 mi away
Black Pond · 5 mi away
Quasset lake · 10 mi away

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