Mallison Falls
Mallison Falls is a masonry dam located in Cumberland County, Maine, built in 1900. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Mallison Falls
The primary purpose of Mallison Falls is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Dichotomy Power Maine, Llc And Presumpcot Hydro, Llc (private). It impounds the Presumpscot River near Westbrook.
The dam stands 14 feet tall and stretches 288 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 30 acre-feet, and collects water from a drainage area of 503 square miles. Completed in 1900, the structure is over a century old.
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 07/18/2022.
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Location
| State | Maine |
| County | Cumberland |
| Nearest City | Westbrook |
| River/Stream | Presumpscot River |
| Coordinates | 43.72710, -70.41990 |
Physical Characteristics
| Dam Type | Masonry |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 288 ft |
| Year Completed | 1900 (126 years old) |
Storage & Hydraulics
| NID Storage | 30 acre-ft |
| Max Storage | 30 acre-ft |
| Normal Storage | 30 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 503 sq mi |
| Max Discharge | 5,500 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Dichotomy Power Maine, LLC and Presumpcot Hydro, LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/18/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | ME00325 |
| Federal ID | ME00325 |
| More Info | State Dam Safety Program |