Lakes / Rhode Island / Providence County / Slack Reservoir
Slack Reservoir, Rhode Island
137 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Rhode Island
41.86 degrees N, 71.55 degrees W - Providence County. State and county outlines drawn from Census boundary data; the lake marker is placed by its USGS National Hydrography Dataset coordinates, not by eye. Schematic - not a survey map.
How Slack Reservoir Stacks Up
- Larger than 71% of the 121 lakes counted in Rhode Island.
- About 8 miles from Providence, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Moswansicut Pond | Providence | 1.7 mi | 283 acres |
| Kimball Reservoir | Providence | 1.7 mi | 25 acres |
| Sprague Lower Reservoir | Providence | 1.8 mi | 25 acres |
| Waterman Reservoir | Providence | 1.9 mi | 261 acres |
| Curran Lower Reservoir | Providence | 2.3 mi | 60 acres |
| Oak Swamp Reservoir | Providence | 2.3 mi | 107 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Slack Reservoir
How Big Is Slack Reservoir?
Slack Reservoir covers 137 acres in Providence County, Rhode Island.
What Is the Largest Lake in Providence County?
Scituate Reservoir is the largest lake in Providence County, at 2,340 acres.
Largest Lakes in Rhode Island
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Scituate Reservoir | Providence | 2,340 acres | - |
| 2 | Worden Pond | Washington | 1,097 acres | - |
| 3 | Flat River Reservoir | Kent | 593 acres | - |
| 4 | Watchaug Pond | Washington | 574 acres | - |
| 5 | Winnapaug Pond | Washington | 476 acres | - |
All 121 Rhode Island lakes ranked by surface area
Sources: USGS NHD (The National Map NHD MapServer layer 12) named waterbodies FTYPE 390/436; counties via Census point-in-polygon lake data (ID 127647317). Verified October 30, 2026.