Mjj Dam
Mjj Dam is an earth dam located in Dutchess County, New York, built in 1961. It carries a Significant hazard potential classification and has a poor condition assessment.
About Mjj Dam
The primary purpose of Mjj Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Daymond John (private). It impounds the Tr-wappinger Creek near Pleasant Valley.
The dam stands 23 feet tall and stretches 350 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 184 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1961, 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 06/06/2023.
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Location
| State | New York |
| County | Dutchess |
| Nearest City | Pleasant Valley |
| River/Stream | Tr-wappinger Creek |
| Coordinates | 41.75944, -73.84111 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 350 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 184 acre-ft |
| Max Storage | 184 acre-ft |
| Normal Storage | 92 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 350 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | DAYMOND JOHN |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 06/06/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | NY01181 |
| Federal ID | NY01181 |
| More Info | State Dam Safety Program |