Conconully dam
Conconully
Conconully is a historic earth dam located in Okanogan, Washington, built in 1909 by the Bureau of Reclamation for irrigation purposes. Standing at 72 feet tall with a hydraulic height of 63 feet, it harnesses the waters of Salmon Creek, providing a maximum storage capacity of 16,570 acre-feet and servicing a drainage area of 5 square miles. The dam covers a surface area of 450 acres and boasts a spillway width of 149 feet for uncontrolled discharge, with a maximum capacity of 11,580 cubic feet per second.
Managed by the Bureau of Reclamation, Conconully's hazard potential is classified as high, with a moderate risk assessment score of 3. The dam has not undergone a recent condition assessment, but emergency action plans have been prepared, last revised in September 2020. While the dam has not been modified in recent years, it remains a critical piece of infrastructure for the surrounding area, providing essential irrigation water to support agricultural activities. With its rich history and significant role in water resource management, Conconully stands as a testament to the importance of infrastructure in sustaining communities and ecosystems in Washington state.
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 Conconully -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Okanogan River Near Tonasket | 5,120 cfs | → |
| Okanogan River At Malott | 5,020 cfs | → |
| Omak Creek Near Omak | 3 cfs | → |
| Methow River At Winthrop | 2,740 cfs | → |
| Chewuch River At Winthrop | 950 cfs | → |
| Methow River At Twisp | 3,520 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Conconully.
Boat launches
- Conconully Road Conconully
- Sinlahekin Road 100-144, Okanogan
- Sinlahekin Road, Okanogan
- South Fish Lake Road, Okanogan
- Sinlahekin Road Okanogan County
Campgrounds
Paddle runs
- Salmon Creek
- Pasayten Wilderness Boundary To Okanogan Nf Boundary
- Lake Chelan-Sawtooth Wilderness Boundary To Okanogan Nf Boundary
- Private Land Boundary To Okanogan Nf Boundary
- Confluence With Tungsten Creek To Pasayten Wilderness Boundary
- Confluence Of South Fork Wolf Creek To Lake Chelan-Sawtooth Wilderness Boundary
Track Conconully 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 Conconully
Where does the data for Conconully 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 Conconully.