Koinenia Lake Dam, also known as Lloyd Hill Dam, is a private-owned structure located in Marion County, Oregon.
Wind
Humidity
Completed in 1976, this earth-type dam serves primarily for irrigation purposes, with a storage capacity of 125 acre-feet. Situated on the Pudding River, a tributary to the Willamette River, the dam stands at a height of 40 feet and has a hydraulic height of 38 feet.
With a significant hazard potential, Koinenia Lake Dam has not been rated for its current condition. Despite being state-regulated and inspected, the dam's emergency action plan (EAP) status, risk assessment, and inundation maps remain unclear. The dam has a spillway width of 0 feet and a maximum discharge capacity of 188 cubic feet per second, serving a drainage area of 3.1 square miles.
For water resource and climate enthusiasts, the Koinenia Lake Dam represents a vital infrastructure for irrigation in the region, but its maintenance and emergency preparedness require further attention. The dam's location in the picturesque city of Pratum offers a serene backdrop to its essential role in water management and agricultural development. As efforts to assess and mitigate risks associated with the dam continue, stakeholders are urged to monitor its condition and ensure the safety of surrounding communities.
Year Completed |
1976 |
Dam Length |
410 |
Dam Height |
40 |
River Or Stream |
PUDDING RIVER, TRIB TO |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
38 |
Drainage Area |
3.1 |
Nid Storage |
125 |
Structural Height |
42 |
Hazard Potential |
Significant |
Nid Height |
42 |
Silver Creek At Silverton
|
52cfs |
Abiqua Creek At Silverton
|
74cfs |
Willamette River At Salem
|
35800cfs |
Zollner Creek Near Mt Angel
|
320cfs |
Butte Creek At Monitor
|
453cfs |
North Santiam River At Mehama
|
7440cfs |
| Location | Reservations | Toilets |
|---|---|---|
Silver Falls State Park
|
||
Howard Creek Horse Camp
|
||
F
|
||
A
|
||
North Falls Group Camp
|
||
D
|