Hartwick Reservoir is an earth dam located in Washington County, Oregon, built in 1956. It carries a Low hazard potential classification.
Dam profile
NID height · 30 ft30 ft tall and 540 ft long, taller than 68% 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 Hartwick Reservoir
The primary purpose of Hartwick Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Henry J. Grass M.d. (private). It impounds the Dairy Creek, Trib to near Orenco.
The dam stands 30 feet tall and stretches 540 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 200 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1956, 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 11/29/2018.
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Location
| State | Oregon |
| County | Washington |
| Nearest City | Orenco |
| River/Stream | Dairy Creek, Trib to |
| Coordinates | 45.61929, -123.14270 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 28 ft |
| Dam Length | 540 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 200 acre-ft |
| Max Storage | 200 acre-ft |
| Normal Storage | 170 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 114 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Henry J. Grass M.d. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/29/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00302 |
| Federal ID | OR00302 |
| More Info | State Dam Safety Program |