Upper Bolton Lake Causeway Dam is an earth dam located in Tolland County, Connecticut. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 7 ft7 ft tall and 130 ft long. 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 Upper Bolton Lake Causeway Dam
The primary purpose of Upper Bolton Lake Causeway Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Connecticut Deep (state). It impounds the Middle Bolton Lake near Bolton.
The dam stands 7 feet tall and stretches 130 feet across, creates a reservoir covering 23 acres, and collects water from a drainage area of 3 square miles.
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. The most recent inspection on record was 07/01/2022.
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Location
| State | Connecticut |
| County | Tolland |
| Nearest City | Bolton |
| River/Stream | Middle Bolton Lake |
| Coordinates | 41.81972, -72.42244 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 130 ft |
Storage & Hydraulics
| Surface Area | 23 acres |
| Drainage Area | 3 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Connecticut Deep |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/01/2022 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT01903 |
| Federal ID | CT01903 |
| More Info | State Dam Safety Program |