Helsell Dam is an earth dam located in San Juan County, Washington, built in 1999. It carries a Low hazard potential classification.
Dam profile
NID height · 16 ft16 ft tall and 150 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 Helsell Dam
The primary purpose of Helsell Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Jb & Jm Helsell, Lllp (private). It impounds the Unnamed Creek.
The dam stands 16 feet tall and stretches 150 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 82 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1999, the structure is 27 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 08/25/2009. That was over 17 years ago.
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Location
| State | Washington |
| County | San Juan |
| River/Stream | Unnamed Creek |
| Coordinates | 48.64879, -123.00312 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Length | 150 ft |
| Year Completed | 1999 (27 years old) |
Storage & Hydraulics
| NID Storage | 82 acre-ft |
| Max Storage | 82 acre-ft |
| Normal Storage | 55 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 5 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Jb & Jm Helsell, Lllp |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/25/2009 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00724 |
| Federal ID | WA00724 |
| More Info | State Dam Safety Program |