Mary Lee Lane Swm Dam
Mary Lee Lane Swm Dam is an earth dam located in Howard County, Maryland, built in 1985. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Mary Lee Lane Swm Dam
The primary purpose of Mary Lee Lane 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 Howard County (local government). It impounds the Hammond Branch-tr-os near North Laurel.
The dam stands 11 feet tall, creates a reservoir covering 0 acres, and collects water from a drainage area of 0 square miles. Completed in 1985, the structure is 41 years 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 07/02/2024.
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Location
| State | Maryland |
| County | Howard |
| Nearest City | North Laurel |
| River/Stream | Hammond Branch-tr-os |
| Coordinates | 39.14554, -76.87391 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Year Completed | 1985 (41 years old) |
Storage & Hydraulics
| Surface Area | 0 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Howard County |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/02/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MD00506 |
| Federal ID | MD00506 |
| More Info | State Dam Safety Program |