Winchester dam
Winchester
Winchester is a public utility located in the city of Winchester, Oregon, along the North Umpqua River. This dam, with a height of 17 feet and a length of 485 feet, was completed in 1904 for the primary purpose of recreation. The dam has a storage capacity of 700 acre-feet and covers a surface area of 27 acres, serving as a popular spot for outdoor activities.
Despite its recreational benefits, Winchester Dam is classified as having a high hazard potential and is currently in poor condition. The last inspection in July 2021 revealed the dam's deteriorating state, prompting concerns for its structural integrity and safety. With a designated inspection frequency of once per year, ongoing monitoring and maintenance are crucial to mitigate potential risks associated with the dam.
Managed by the Oregon Water Resources Department, Winchester Dam plays a significant role in the local water resource management and climate regulation efforts. As climate change continues to impact water availability and quality, the maintenance and upkeep of dams like Winchester are essential in ensuring the sustainability and resilience of water resources for future generations.
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 Winchester -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| North Umpqua River At Winchester | 1,340 cfs | → |
| South Umpqua River Near Brockway | 442 cfs | → |
| Little Wolf Creek Near Tyee | 4 cfs | → |
| Little River At Peel | 2,120 cfs | → |
| Umpqua River Near Elkton | 1,860 cfs | → |
| Cow Creek Near Riddle | 92 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Winchester.
Boat launches
Campgrounds
- Amacher County Park
- Amacher Park
- Douglas County Fairgrounds Rv Park
- Whistlers Bend County Park
- Tyee Recreation Site
- Tyee - Sutherlin
Track Winchester 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 Winchester
Where does the data for Winchester 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 Winchester.