Shores of Calvert Upper Dam (rivershore Drive) is an earth dam located in Calvert County, Maryland, built in 1972. It carries a Significant hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 25 ft25 ft tall and 275 ft long, taller than 50% of U.S. dams with a recorded height. 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 Shores of Calvert Upper Dam (rivershore Drive)
The primary purpose of Shores of Calvert Upper Dam (rivershore Drive) is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Shores of Calvert Assn (private). It impounds the Patuxent River-tr near Dunkirk.
The dam stands 25 feet tall and stretches 275 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 50 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1972, the structure is well into its service life at over 50 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 12/05/2022.
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Location
| State | Maryland |
| County | Calvert |
| Nearest City | Dunkirk |
| River/Stream | Patuxent River-tr |
| Coordinates | 38.73960, -76.68060 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 275 ft |
| Year Completed | 1972 (54 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Max Storage | 50 acre-ft |
| Normal Storage | 20 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 125 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Shores of Calvert Assn |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 12/05/2022 |
| Emergency Action Plan | No |
Identifiers
| NID ID | MD00436 |
| Federal ID | MD00436 |
| More Info | State Dam Safety Program |