Eightmile Lake Outlet Dam dam
Eightmile Lake Outlet Dam
The Eightmile Lake Outlet Dam, located in Chelan, Washington, serves as a crucial structure for both irrigation and recreational purposes. Built in 1933, this rockfill dam stands at a hydraulic height of 22 feet and a structural height of 19 feet, with a length of 200 feet. The dam has a storage capacity of 1610 acre-feet and covers a surface area of 65 acres, drawing water from Eightmile Creek.
Despite its importance, the dam poses a high hazard potential due to its poor condition assessment as of October 2018. The Washington Dept of Ecology regulates and inspects the dam regularly, with inspections occurring every five years. The dam's emergency action plan was last updated in September 2018, ensuring that proper measures are in place for any potential risks or emergencies. As an enthusiast of water resources and climate, staying informed about the condition and maintenance of the Eightmile Lake Outlet Dam is crucial for understanding its impact on the surrounding ecosystem and communities.
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 Eightmile Lake Outlet Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Icicle Creek Above Snow Creek Near Leavenworth | 807 cfs | → |
| Wenatchee River At Peshastin | 4,110 cfs | → |
| Wenatchee River At Plain | 2,900 cfs | → |
| Wenatchee River At Monitor | 4,090 cfs | → |
| Chiwawa River Near Plain | 864 cfs | → |
| Mad River At Ardenvoir | 206 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Eightmile Lake Outlet Dam.
Boat launches
- Leavenworth Public Boat Launch
- Cooper Lake Boat Launch
- Salmon La Sac Road, Ronald
- Lake Cabins Road Kittitas County
- Bakers Lane, Easton
- Apple Capital Recreation Loop Trail, Wenatchee
Campgrounds
- Trout Lake Creek
- Leprechaun Lake Backcountry Camping
- Bridge Creek Camping
- Eightmile Campground
- Icicle Group Campground
- Johnny Creek
Paddle runs
- Rock Island Campground To Ida Creek
- Alpine Lakes Wilderness Boundary To City Of Leavenworth Water Intake In Se1/4 Of Sec 28, T24n, R17e
- Headwaters At Josephine Lake To Alpine Lakes Wilderness Boundary
- Outlet Of Lake Wenatchee To Wenatchee Nf Boundary
- Alpine Lakes Wilderness Boundary To Private Land Boundary At North Section Line Of Sec 3, T23n, R14e
- Headwaters In Nw1/4 Of Sec 12, T24n, R13e To Alpine Lakes Wilderness Boundary
Track Eightmile Lake Outlet 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 Eightmile Lake Outlet Dam
Where does the data for Eightmile Lake Outlet 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 Eightmile Lake Outlet Dam.