Firnstahl Dam
Firnstahl Dam is an earth dam located in Snohomish County, Washington, built in 1965. It carries a Low hazard potential classification and has a poor condition assessment.
About Firnstahl Dam
The primary purpose of Firnstahl Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Firnstahl Family Ltd Ptnshp (private). It impounds the Tr-siberia Creek.
The dam stands 19 feet tall and stretches 150 feet across, creates a reservoir covering 50 acres, has a maximum storage capacity of 62 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1965, 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. 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 07/08/2022.
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Location
| State | Washington |
| County | Snohomish |
| River/Stream | Tr-siberia Creek |
| Coordinates | 48.16927, -122.03197 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Length | 150 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 62 acre-ft |
| Max Storage | 62 acre-ft |
| Normal Storage | 50 acre-ft |
| Surface Area | 50 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 35 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Firnstahl Family Ltd Ptnshp |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 07/08/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00549 |
| Federal ID | WA00549 |
| More Info | State Dam Safety Program |