Duncan Dam No 1 dam
Duncan Dam No 1
Duncan Dam No 1, located in Pend Oreille, Washington, was completed in 1966 with a primary purpose of recreation. Owned privately, this earth dam stands at a hydraulic height of 16 feet and a structural height of 12 feet, with a length of 176 feet. It has a storage capacity of 150 acre-feet, with a normal storage level of 96 acre-feet. The dam is situated on Tr-Pend Oreille River and is under the jurisdiction of the Washington Dept of Ecology.
With a low hazard potential and a condition assessment of "Not Rated," Duncan Dam No 1 is regulated and inspected by state authorities, ensuring its safety and continued operation. While it does not have a spillway or outlet gates, the dam serves the community for irrigation and recreational purposes. Although last inspected in 2000, the dam's emergency action plan status and risk assessment details are currently unknown. Despite these gaps in information, Duncan Dam No 1 remains a vital resource for water management and outdoor activities in the region.
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 Duncan Dam No 1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Pend Oreille River At Newport Wa | 46,700 cfs | → |
| Priest River Nr Priest River Id | 3,460 cfs | → |
| Little Spokane River At Elk | 48 cfs | → |
| Priest R Outflow Nr Coolin | 2,820 cfs | → |
| Pack River Nr Colburn Id | 610 cfs | → |
| Little Spokane River At Dartford | 187 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Duncan Dam No 1.
Boat launches
- Kaniksu Drive Pend Oreille County
- Pondoray Shores Road, Newport
- Old Diamond Mill Road 71, Oldtown
- South Shore Diamond Lake Road 765-1255, Newport
- Viewpoint Road 61, Newport
- Pow Wow Park, Cusick
Campgrounds
- Enchantment Camp
- Lodge Creek Camp
- Skookum Creek- State Forest
- Albeni Cove Campground
- Albeni Cove - Oldtown
- County Fair Campground
Paddle runs
- Forest Boundary, Sec. 34, T59n, R2w To Harrison Lake, Sec. 31, T62n, R2w
- Upper Priest River
- Segment 2 Flows For Almost 10 Miles From The Intersection With Trail 312 To Its Confluence With The Upper Priest River To Segment 2 Flows For Almost 10 Miles From The Intersection With Trail 312 To Its Confluence With The Upper Priest River
- Segment 1 Is Classified As Wild And Flows From Its Source For Almost Five Miles To The Intersection With Trail 312 To Segment 1 Is Classified As Wild And Flows From Its Source For Almost To The Intersection With Trail 312
- Ne1/4 Of Sec 13, T40n, R46e To Nw1/4 Of Sec 5, T40n, R46e
- Long Canyon Pass, Sec. 30, T63n, R2w To Forest Boundary, Road #417, Sec. 25, T63n, R2w
Track Duncan Dam No 1 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 Duncan Dam No 1
Where does the data for Duncan Dam No 1 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 Low 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 Duncan Dam No 1.