Mill Pond dam
Mill Pond
Mill Pond, located in Metaline Falls, Washington, is a gravity dam completed in 1922 for hydroelectric and recreational purposes. Standing at 65 feet tall with a hydraulic height of 57 feet, the dam holds a storage capacity of 1430 acre-feet and covers a surface area of 65 acres. The dam, situated on Sullivan Creek and the Pend Oreille River, has a maximum discharge of 4000 cubic feet per second and features an uncontrolled spillway with a width of 84 feet.
Owned and operated by a public utility, Mill Pond is regulated by the Federal Energy Regulatory Commission (FERC) and falls under the jurisdiction of the Seattle District. With a hazard potential classified as high and a moderate risk assessment rating, the dam is subject to regular inspections by FERC to ensure its structural integrity. Despite its age, the condition assessment of Mill Pond is currently listed as "Not Available," highlighting the need for ongoing monitoring and maintenance to mitigate any potential risks associated with the dam.
For water resource and climate enthusiasts, Mill Pond serves as a fascinating example of early 20th-century engineering designed to harness the power of flowing water for renewable energy production. The dam not only provides electricity but also offers recreational opportunities for the local community. As climate change continues to impact water resources, understanding the role of dams like Mill Pond in managing water flow and storage becomes increasingly important for sustainable water management practices 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 Mill Pond -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Outlet Creek Near Metaline Falls | 19 cfs | → |
| Pend Oreille River Below Box Canyon Near Ione | 40,700 cfs | → |
| Columbia River At International Boundary | 141,000 cfs | → |
| Priest R Outflow Nr Coolin | 605 cfs | → |
| Boundary Creek Nr Porthill Id | 499 cfs | → |
| Kootenai River At Porthill Id | 15,000 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Mill Pond.
Boat launches
- Sullivan Lake Road, Metaline Falls
- Linton Street, Metaline
- International Selkirk Loop, Ione
- Johnson Road 3698, Ione
- Boundary Access Road, Metaline Falls
- Ione Motel And Rv Park, Ione
Campgrounds
- Mill Pond Campground
- Mill Pond
- Sullivan Lake
- West Sullivan Campground
- West Sullivan
- East Sullivan Campground
Paddle runs
- Ne1/4 Of Sec 13, T40n, R46e To Nw1/4 Of Sec 5, T40n, R46e
- 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
- Upper Priest River
- Long Canyon Pass, Sec. 30, T63n, R2w To Forest Boundary, Road #417, Sec. 25, T63n, R2w
- Forest Boundary, Sec. 34, T59n, R2w To Harrison Lake, Sec. 31, T62n, R2w
Track Mill Pond 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 Mill Pond
Where does the data for Mill Pond 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 Mill Pond.