Colby Pond is an earth dam located in Windsor County, Vermont, built in 1959. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 29 ft29 ft tall and 505 ft long, taller than 65% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Colby Pond
The primary purpose of Colby Pond is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by State of Vermont - Dfw (state). It impounds the Twentymile Stream near Plymouth.
The dam stands 29 feet tall and stretches 505 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 210 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1959, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 05/29/2013. That was over 13 years ago.
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Location
| State | Vermont |
| County | Windsor |
| Nearest City | Plymouth |
| River/Stream | Twentymile Stream |
| Coordinates | 43.46947, -72.66526 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 505 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 210 acre-ft |
| Max Storage | 210 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | State of Vermont - Dfw |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 05/29/2013 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | VT00110 |
| Federal ID | VT00110 |
| More Info | State Dam Safety Program |