Deep Hollow Reservoir Dam
Deep Hollow Reservoir Dam is an earth dam located in Middlesex County, Connecticut, built in 1854. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Deep Hollow Reservoir Dam
The primary purpose of Deep Hollow Reservoir Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Connecticut Water Company (public utility). It impounds the Great Brook near Chester.
The dam stands 28 feet tall and stretches 352 feet across, creates a reservoir covering 27 acres, has a maximum storage capacity of 255 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1854, the structure is one of the older dams in the region, with over a century and a half of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 10/01/2019.
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Location
| State | Connecticut |
| County | Middlesex |
| Nearest City | Chester |
| River/Stream | Great Brook |
| Coordinates | 41.41508, -72.48462 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 352 ft |
| Year Completed | 1854 (172 years old) |
Storage & Hydraulics
| NID Storage | 255 acre-ft |
| Max Storage | 255 acre-ft |
| Normal Storage | 200 acre-ft |
| Surface Area | 27 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 509 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Connecticut Water Company |
| Owner Type | Public Utility |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/01/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT00394 |
| Federal ID | CT00394 |
| More Info | State Dam Safety Program |