Cossayuna Lake Outlet Dam is an earth dam located in Washington County, New York, built in 1815. It carries a Low hazard potential classification.
Dam profile
NID height · 10 ft10 ft tall and 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 Cossayuna Lake Outlet Dam
The primary purpose of Cossayuna Lake Outlet Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Cossayuna Lake Improvement Inc (private). It impounds the Whittaker Brook near Cossayuna.
The dam stands 10 feet tall and stretches 200 feet across, creates a reservoir covering 659 acres, has a maximum storage capacity of 7,908 acre-feet, and collects water from a drainage area of 11 square miles. Completed in 1815, 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 07/20/2010. That was over 16 years ago.
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Location
| State | New York |
| County | Washington |
| Nearest City | Cossayuna |
| River/Stream | Whittaker Brook |
| Coordinates | 43.18250, -73.42917 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 200 ft |
| Year Completed | 1815 (211 years old) |
Storage & Hydraulics
| NID Storage | 7,908 acre-ft |
| Max Storage | 7,908 acre-ft |
| Normal Storage | 7,908 acre-ft |
| Surface Area | 659 acres |
| Drainage Area | 11 sq mi |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Cossayuna Lake Improvement Inc |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/20/2010 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NY00016 |
| Federal ID | NY00016 |
| More Info | State Dam Safety Program |