Lake of the Pines (tarnans Branch Crossing) is an earth dam located in Anne Arundel County, Maryland, built in 1981. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 22 ft22 ft tall and 313 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 Lake of the Pines (tarnans Branch Crossing)
The primary purpose of Lake of the Pines (tarnans Branch Crossing) is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Aa County Dpw (local government). It impounds the Tarnans Branch near Bon Haven.
The dam stands 22 feet tall and stretches 313 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 106 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1981, the structure is 45 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 03/25/2022.
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Location
| State | Maryland |
| County | Anne Arundel |
| Nearest City | Bon Haven |
| River/Stream | Tarnans Branch |
| Coordinates | 38.96680, -76.63770 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 313 ft |
| Year Completed | 1981 (45 years old) |
Storage & Hydraulics
| NID Storage | 106 acre-ft |
| Max Storage | 106 acre-ft |
| Normal Storage | 18 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,040 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Aa County Dpw |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 03/25/2022 |
| Emergency Action Plan | No |
Identifiers
| NID ID | MD00091 |
| Federal ID | MD00091 |
| More Info | State Dam Safety Program |