Thorald Dam
Thorald Dam is an earth dam located in San Juan County, Washington, built in 1988. It carries a Low hazard potential classification.
About Thorald Dam
The primary purpose of Thorald Dam 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 Preservation Trust (private). It impounds the Tr-parks Bay.
The dam stands 19 feet tall and stretches 400 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 98 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1988, the structure is 38 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.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Washington |
| County | San Juan |
| River/Stream | Tr-parks Bay |
| Coordinates | 48.56242, -122.97161 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Length | 400 ft |
| Year Completed | 1988 (38 years old) |
Storage & Hydraulics
| NID Storage | 98 acre-ft |
| Max Storage | 98 acre-ft |
| Normal Storage | 85 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 15 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | San Juan Preservation Trust |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00579 |
| Federal ID | WA00579 |
| More Info | State Dam Safety Program |