Zylstra Dam No 2
Zylstra Dam No 2 is an earth dam located in San Juan County, Washington, built in 1963. It carries a Low hazard potential classification.
About Zylstra Dam No 2
The primary purpose of Zylstra Dam No 2 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by San Juan County Land Bank (local government). It impounds the Tr-false Bay.
The dam stands 25 feet tall, creates a reservoir covering 280 acres, has a maximum storage capacity of 430 acre-feet, and collects water from a drainage area of 8 square miles. Completed in 1963, the structure is well into its service life at over 50 years old.
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 04/24/2019.
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Location
| State | Washington |
| County | San Juan |
| River/Stream | Tr-false Bay |
| Coordinates | 48.51911, -123.08899 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 430 acre-ft |
| Max Storage | 430 acre-ft |
| Normal Storage | 280 acre-ft |
| Surface Area | 280 acres |
| Drainage Area | 8 sq mi |
| Max Discharge | 117 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | San Juan County Land Bank |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Last Inspection | 04/24/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00163 |
| Federal ID | WA00163 |
| More Info | State Dam Safety Program |