Holstein Lake Dam is a concrete dam located in Morris County, New Jersey, built in 1875. It carries a Low hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 130 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Holstein Lake Dam
The primary purpose of Holstein Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Gus Holstein (private). It impounds the Rockaway River-tr near Rockaway.
The dam stands 15 feet tall and stretches 130 feet across, creates a reservoir covering 10 acres, has a storage capacity of 50 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1875, the structure is one of the older dams in the region, with over a century and a half 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. The most recent inspection on record was 10/08/2002. That was over 24 years ago.
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Location
| State | New Jersey |
| County | Morris |
| Nearest City | Rockaway |
| River/Stream | Rockaway River-tr |
| Coordinates | 40.89007, -74.50153 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 130 ft |
| Year Completed | 1875 (151 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Normal Storage | 50 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 28 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Gus Holstein |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/08/2002 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NJ00979 |
| Federal ID | NJ00979 |
| More Info | State Dam Safety Program |