Crystal Lake Dam is an earth dam located in Bergen County, New Jersey, built in 1939. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 10 ft10 ft tall and 1,200 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 Crystal Lake Dam
The primary purpose of Crystal Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Ramapo Moutian Lakes, Inc. (private). It impounds the Allemans Brook near Pompton Lakes.
The dam stands 10 feet tall and stretches 1,200 feet across, creates a reservoir covering 26 acres, has a maximum storage capacity of 450 acre-feet, and collects water from a drainage area of 6 square miles. Completed in 1939, the structure is well-established, with more than 75 years of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected 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 09/18/2024.
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Location
| State | New Jersey |
| County | Bergen |
| Nearest City | Pompton Lakes |
| River/Stream | Allemans Brook |
| Coordinates | 41.03105, -74.24265 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 1,200 ft |
| Year Completed | 1939 (87 years old) |
Storage & Hydraulics
| NID Storage | 450 acre-ft |
| Max Storage | 450 acre-ft |
| Normal Storage | 400 acre-ft |
| Surface Area | 26 acres |
| Drainage Area | 6 sq mi |
| Max Discharge | 630 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Ramapo Moutian Lakes, Inc. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 09/18/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NJ00217 |
| Federal ID | NJ00217 |
| More Info | State Dam Safety Program |