Ravensdale Pit dam
Ravensdale Pit
Ravensdale Pit is a privately owned dam located in Ravensdale, King County, Washington. Built in 1972, this Earth-type structure stands at a height of 18 feet and spans a length of 2950 feet, with a storage capacity of 165 acre-feet. Situated on the Tr-Green River, the dam serves a primary purpose other than flood control or water supply, and is regulated by the Washington Department of Ecology.
Despite its low hazard potential, Ravensdale Pit has not been rated for its condition since its last inspection in 1999. The dam's emergency action plan status, risk assessment, and inundation maps remain unprepared or updated. While the structure meets regulatory guidelines and is subject to regular inspections, its overall risk management measures and emergency preparedness are lacking in documentation.
For water resource and climate enthusiasts, Ravensdale Pit presents an intriguing case study in dam infrastructure management and emergency preparedness. With its unique characteristics and historical data, this site offers valuable insights into the challenges and opportunities of maintaining and regulating water storage structures in the Pacific Northwest 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 Ravensdale Pit -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Rock Creek At Highway 516 Near Ravensdale | 11 cfs | → |
| Cedar River Below Diversion Near Landsburg | 267 cfs | → |
| Rock Creek Near Maple Valley | 2 cfs | → |
| Cedar River Near Landsburg | 447 cfs | → |
| Newaukum Creek Near Black Diamond | 38 cfs | → |
| Taylor Creek Near Selleck | 66 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Ravensdale Pit.
Boat launches
- Southeast 296th Street 22601, Black Diamond
- 148th Avenue Southeast Kent
- Shady Lake Boat Ramp
- Southeast Green Valley Road 12507-12565, Auburn
- Lake Fenwick Trail Kent
- Allan Yorke Park
Campgrounds
- Kanaskat-Palmer State Park Campground
- Kanaskat Palmer Recreation Area
- Sunset Lake Camp
- Point Robinson Campground
- Alice Creek Campsite
- Dash Point State Park
Paddle runs
- Snoqualmie Falls To Plum's Landing
- Wagner Bridge To Confluence With Middle Fork Snoqualmie River
- Confluence With Taylor River To Confluence With North Fork Snoqualmie River
- Huckleberry Creek To Confluence With Clearwater River
- Quartz Road To Confluence With Middle Fork Snoqualmie River
- Alpine Lakes Wilderness Boundary To Quartz Creek Road
Track Ravensdale Pit 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 Ravensdale Pit
Where does the data for Ravensdale Pit 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 Ravensdale Pit.