Olson Reservoir (mark) is an earth dam located in Polk County, Oregon, built in 1988. It carries a Significant hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall and 360 ft long, taller than 50% 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 Olson Reservoir (mark)
The primary purpose of Olson Reservoir (mark) is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Hvr Inc. (private). It impounds the Ash Swale, Trib to near Mccoy.
The dam stands 25 feet tall and stretches 360 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 46 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 significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. The most recent inspection on record was 04/09/2019.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Oregon |
| County | Polk |
| Nearest City | Mccoy |
| River/Stream | Ash Swale, Trib to |
| Coordinates | 45.06815, -123.18142 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 360 ft |
| Year Completed | 1988 (38 years old) |
Storage & Hydraulics
| NID Storage | 46 acre-ft |
| Max Storage | 46 acre-ft |
| Normal Storage | 45 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 50 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Hvr Inc. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 04/09/2019 |
| Emergency Action Plan | No |
Identifiers
| NID ID | OR00724 |
| Federal ID | OR00724 |
| More Info | State Dam Safety Program |