Diack Reservoir is an earth dam located in Multnomah County, Oregon, built in 1955. It carries a Low hazard potential classification.
Dam profile
NID height · 26 ft26 ft tall and 220 ft long, taller than 55% of U.S. dams with a recorded height. 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 Diack Reservoir
The primary purpose of Diack Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Samuel L. Diack (private). It impounds the Sandy River, Trib of near Cottrell.
The dam stands 26 feet tall and stretches 220 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 20 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1955, 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 04/14/2015. That was over 11 years ago.
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Location
| State | Oregon |
| County | Multnomah |
| Nearest City | Cottrell |
| River/Stream | Sandy River, Trib of |
| Coordinates | 45.47440, -122.29825 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 220 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 20 acre-ft |
| Max Storage | 20 acre-ft |
| Normal Storage | 20 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 191 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Samuel L. Diack |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 04/14/2015 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR01543 |
| Federal ID | OR01543 |
| More Info | State Dam Safety Program |