Trask Lake Dam dam
Trask Lake Dam
Trask Lake Dam, located in Mason County, Washington, was completed in 1969 for recreational purposes. The dam, primarily made of earth with a stone core and soil foundation, stands at a hydraulic height of 10 feet and a structural height of 8 feet, impounding Tr-Shumocher Creek to create a surface area of 13.8 acres. The dam has a storage capacity of 140 acre-feet, with a normal storage level of 40 acre-feet, serving as a popular spot for outdoor activities in the area.
Despite its recreational appeal, Trask Lake Dam poses a high hazard potential with a poor condition assessment as of its last inspection in 2018. The dam is regulated by the Washington Department of Ecology and is subject to state permitting, inspection, and enforcement. With a maximum discharge capacity of 95 cubic feet per second, the dam's safety and maintenance are crucial to mitigate any potential risks to downstream communities and the environment.
For water resource and climate enthusiasts, Trask Lake Dam serves as a notable landmark in the region, highlighting the intersection of water management, recreational activities, and dam safety. With its unique design and importance for the local community, the dam's condition and risk assessment are key considerations for ensuring its continued functionality and safety in the face of changing climate conditions and potential hazards.
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 Trask Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Skokomish River Near Potlatch | 512 cfs | → |
| North Fork Skokomish River Near Potlatch | 254 cfs | → |
| South Fork Skokomish River Near Union | 172 cfs | → |
| Huge Creek Near Wauna | 7 cfs | → |
| Nf Skokomish R Bl Staircase Rpds Nr Hoodsport | 118 cfs | → |
| Deschutes River At E St Bridge At Tumwater | 165 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Trask Lake Dam.
Boat launches
- 3041 E Mason Lake Dr E, Grapeview, Wa 98546
- East Way To Tipperary Street 204, Mason County
- Highway 106 5101, Union
- East Harstine Bridge Road 51, Shelton
- Highway 3 18560, Belfair
- Us 101 Mason County
Campgrounds
- Twanoh State Park
- Jarrell Cove State Park
- Camp Hahobas
- Potlatch State Park
- Potlach State Park Campground
- Belfair State Park
Paddle runs
- Headwaters- Includes All Tributaries To Confluence With North Fork Skokomish River
- Headwaters To Confluence With North Fork Skokomish River
- Headwaters- Includes All Tributaries Within Park To Olympic National Park Boundary
- Headwaters- Includes All Tributaries And Excludes Flapjack Lakes To Confluence With North Fork Skokomish River
- Headwaters To Southern Boundary Of Olympic National Park
Track Trask Lake 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 Trask Lake Dam
Where does the data for Trask Lake 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 Trask Lake Dam.