Hartwick Reservoir, located in Orenco, Oregon, is a private water resource managed by the H-20 state agency and regulated by the Oregon Water Resources Department.
Wind
Humidity
Built in 1956 for irrigation purposes, this earth dam stands at 30 feet high and spans 540 feet in length, with a storage capacity of 200 acre-feet. The reservoir covers an area of 8.6 acres and is fed by Dairy Creek, a tributary to the Tualatin River.
Despite its low hazard potential and moderate risk assessment, Hartwick Reservoir is equipped with an uncontrolled spillway and has a maximum discharge capacity of 114 cubic feet per second. The dam has not been rated for condition assessment, and its last inspection was conducted in November 2018. With a drainage area of 0.8 square miles, this reservoir plays a critical role in supporting local irrigation needs and sustaining agricultural activities in the region.
As a key component of the water infrastructure in Washington County, Oregon, Hartwick Reservoir serves as a vital resource for water management and agricultural development. Climate and water enthusiasts will appreciate the reservoir's historical significance, engineering design, and its role in ensuring water security for the surrounding community.
Year Completed |
1956 |
Dam Length |
540 |
Dam Height |
28 |
River Or Stream |
DAIRY CREEK, TRIB TO |
Primary Dam Type |
Earth |
Surface Area |
8.6 |
Hydraulic Height |
24 |
Drainage Area |
0.8 |
Nid Storage |
200 |
Structural Height |
30 |
Hazard Potential |
Low |
Nid Height |
30 |
| Location | Reservations | Toilets |
|---|---|---|
Brooke Creek Hike-in Camp
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Camp R&R
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L. L. Stub Stewart State Park
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Gales Creek
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Gales Creek Campground
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Reeher Forest Park
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