Green Peter Dam dam
Green Peter Dam
Green Peter Dam, located on the Middle Santiam River in Oregon, was completed in 1967 by the US Army Corps of Engineers for flood risk reduction, hydroelectric power generation, irrigation, navigation, and recreation purposes. The gravity dam stands at 320 feet tall and has a storage capacity of 430,000 acre-feet, covering a surface area of 3,720 acres. Despite being classified as having a high hazard potential, a recent risk assessment conducted by USACE in 2020 deemed the dam's risk level to be low, with no immediate need for modifications or short-term measures.
USACE continues to monitor and evaluate the condition and risks associated with Green Peter Dam through routine inspections and advanced studies. The dam is equipped with instrumentation for performance monitoring and seismic activity detection. In the event of an earthquake, post-earthquake procedures are in place for inspection and evaluation of any damages. The Emergency Action Plan (EAP) for Green Peter Dam outlines emergency response procedures, and USACE is committed to updating the EAP based on the latest risk assessment results and inundation maps, as well as increasing community awareness of flood risks and dam-related risks.
Although the Willamette Valley dams, including Green Peter Dam, play a crucial role in reducing flood risks for the region, they cannot completely eliminate the potential for flooding during extreme weather events. USACE remains confident in the structural integrity of the dams and their ability to mitigate flood risks, but acknowledges the possibility of flooding downstream in communities along the South Santiam River in the event of extreme rainfall or snowmelt.
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 Green Peter Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| South Santiam River Below Cascadia | 201 cfs | → |
| Wiley Creek Near Foster | 45 cfs | → |
| South Santiam River Near Foster | 1,320 cfs | → |
| Quartzville Creek Near Cascadia | 105 cfs | → |
| Schafer Creek Near Lacomb | · | → |
| South Santiam River At Waterloo | 1,460 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Green Peter Dam.
Boat launches
Campgrounds
- River Bend County Park
- Whitcomb Creek
- Sunnyside Park
- Boat In Camping
- Cascadia State Park
- Longbow Organization Camp
Paddle runs
- Sevenmile Creek To Willamette Nf Boundary
- Confluence With Unnamed Creek West Of Bruler To Willamette Nf Boundary
- Middle Santiam Wilderness Boundary To Willamette Nf Boundary
- Middle Santiam River
- Headwaters Of Sevenmile Creek To Confluence With Latiwi Creek
- West Section Line Of Sec 31, T12s, R6e To Middle Santiam Wilderness Boundary
Track Green Peter 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 Green Peter Dam
Where does the data for Green Peter 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 High 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 Green Peter Dam.