New Mark Commons Community Lake
New Mark Commons Community Lake is an earth dam located in Montgomery County, Maryland, built in 1966. It carries a Significant hazard potential classification and has a poor condition assessment.
About New Mark Commons Community Lake
The primary purpose of New Mark Commons Community Lake is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by New Mark Commons Assn Inc (private). It impounds the Cabin John Creek near Rockville.
The dam stands 15 feet tall and stretches 300 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 50 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1966, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 10/14/2020.
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Location
| State | Maryland |
| County | Montgomery |
| Nearest City | Rockville |
| River/Stream | Cabin John Creek |
| Coordinates | 39.07575, -77.15348 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 300 ft |
| Year Completed | 1966 (60 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Max Storage | 50 acre-ft |
| Normal Storage | 30 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | New Mark Commons Assn Inc |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 10/14/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MD00628 |
| Federal ID | MD00628 |
| More Info | State Dam Safety Program |