Connecticut lake depth maps
Rainbow Reservoir depth map
Rainbow Reservoir in Thompson, Connecticut reaches a depth of 35 feet. The official Connecticut survey maps 7 depth bands across 105 contour lines. This free map of Rainbow Reservoir shows every surveyed contour as an interactive depth chart you can use to plan a session before you travel.
Rainbow Reservoir depth chart: 7 depth bands to 35 ft
Data: CT DEEP Lake Bathymetry (CC0), retrieved August 2026 · depths change over time · not for navigation
| Depth contour | Share of mapped area inside it |
|---|---|
| 5 ft | about 86% |
| 25 ft | about 28% |
| 30 ft | about 17% |
| 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 Rainbow Reservoir: 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 Rainbow Reservoir
Rainbow Reservoir 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.
Rainbow Reservoir depth map FAQs
- How deep is Rainbow Reservoir?
- Rainbow Reservoir 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 Rainbow Reservoir?
- The deepest surveyed water on Rainbow Reservoir sits toward the northeastern corner 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 Rainbow Reservoir 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 Rainbow Reservoir
- Twin Lakes South depth map · 18 ft max · 8 mi away
- Congamond Lakes depth map · 40 ft max · 9 mi away
- McDonough Lake depth map · 50 ft max · 13 mi away
- Wethersfield Cove depth map · 15 ft max · 13 mi away
- Keeney Cove depth map · 24 ft max · 13 mi away
Mapped fishing venues near Rainbow Reservoir
Rainbow Reservoir in the venue directory covers access and fishing details for this water.
- McLean Game Refuge · 7 mi away
- Twin Lakes South · 8 mi away
- Congamond Lakes · 9 mi away
Fishing in Connecticut needs a state license: US fishing license guide · all Connecticut venues