Hallowell Swm Dam
Hallowell Swm Dam is an earth dam located in Montgomery County, Maryland, built in 1990. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Hallowell Swm Dam
The primary purpose of Hallowell Swm Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Montgomery County Dep (local government). It impounds the James Creek.
The dam stands 29 feet tall and stretches 600 feet across, creates a reservoir covering 14 acres, has a maximum storage capacity of 357 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1990, the structure is 36 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 04/20/2022.
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Location
| State | Maryland |
| County | Montgomery |
| River/Stream | James Creek |
| Coordinates | 39.15600, -77.04660 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 600 ft |
| Year Completed | 1990 (36 years old) |
Storage & Hydraulics
| NID Storage | 357 acre-ft |
| Max Storage | 357 acre-ft |
| Normal Storage | 84 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 3,800 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Montgomery County DEP |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/20/2022 |
| Emergency Action Plan | No |
Identifiers
| NID ID | MD00317 |
| Federal ID | MD00317 |
| More Info | State Dam Safety Program |