Koinenia Lake Dam dam
Koinenia Lake Dam
Koinenia Lake Dam, also known as Lloyd Hill Dam, is a private-owned structure located in Marion County, Oregon. 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.
Dam data reference
Condition Assessment
- Satisfactory
- No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
- Fair
- No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action.
- Poor
- A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency.
- Unsatisfactory
- A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
- Not Rated
- The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Hazard Potential Classification
- High
- Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
- Significant
- Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environmental damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
- Low
- Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
- Undetermined
- Dams for which a downstream hazard potential has not been designated or is not provided.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Koinenia Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Silver Creek At Silverton | 52 cfs | → |
| Abiqua Creek At Silverton | 74 cfs | → |
| Willamette River At Salem | 10,600 cfs | → |
| Zollner Creek Near Mt Angel | 320 cfs | → |
| Butte Creek At Monitor | 53 cfs | → |
| North Santiam River At Mehama | 1,500 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Koinenia Lake Dam.
Track Koinenia Lake Dam in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Koinenia Lake Dam
Where does the data for Koinenia Lake Dam come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the Significant hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Koinenia Lake Dam.