Upper Flint Pond Dam is an earth dam located in Middlesex County, Massachusetts. It carries a Significant hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 9 ft9 ft tall and 125 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 Flint Pond Dam
The primary purpose of Upper Flint Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Ma Department of Fish and Game (state). It impounds the Bridge Meadow Brook near Tyngsborough.
The dam stands 9 feet tall and stretches 125 feet across, creates a reservoir covering 72 acres, has a maximum storage capacity of 324 acre-feet, and collects water from a drainage area of 7 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 03/02/2020.
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Location
| State | Massachusetts |
| County | Middlesex |
| Nearest City | Tyngsborough |
| River/Stream | Bridge Meadow Brook |
| Coordinates | 42.67490, -71.42572 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 9 ft |
| Dam Length | 125 ft |
Storage & Hydraulics
| NID Storage | 324 acre-ft |
| Max Storage | 324 acre-ft |
| Normal Storage | 180 acre-ft |
| Surface Area | 72 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 349 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Ma Department of Fish and Game |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 03/02/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA01001 |
| Federal ID | MA01001 |
| More Info | State Dam Safety Program |