Issaquah Highlands Npe Pond dam
Issaquah Highlands Npe Pond
Issaquah Highlands Npe Pond, located in Issaquah, Washington, serves as a crucial element in flood risk reduction efforts in the region. Managed by the local government and regulated by the Washington Dept of Ecology, this earth dam structure was completed in 2003 and stands at a hydraulic height of 24 feet. With a capacity to store up to 36 acre-feet of water, this pond plays a vital role in mitigating potential flood hazards in the area, particularly during periods of high discharge.
Covering a surface area of 3.1 acres and draining a 0.1 square mile area, Issaquah Highlands Npe Pond is designed to withstand high hazard potential events and has been assessed to be in fair condition as of the last inspection in July 2020. The dam's primary purpose is flood risk reduction, with a normal storage capacity of 11 acre-feet. While the structure has not undergone any modifications over the years, regular inspections are conducted every 5 years to ensure its continued safety and effectiveness in protecting the surrounding communities along NF Issaquah Creek.
With a designated emergency action plan (EAP) review date in December 2021 and a contact frequency of every 5 years, Issaquah Highlands Npe Pond remains a critical component in the region's water resource management and climate resilience strategies. As climate change continues to pose challenges in terms of increased precipitation and extreme weather events, the importance of maintaining and monitoring infrastructure like this earth dam becomes ever more apparent in safeguarding communities and environments against the impacts of flooding.
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 Issaquah Highlands Npe Pond -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Issaquah Creek Near Mouth Near Issaquah | 44 cfs | → |
| Raging River Near Fall City | 32 cfs | → |
| Issaquah Creek Near Hobart | 27 cfs | → |
| Snoqualmie River Near Snoqualmie | 1,610 cfs | → |
| Snoqualmie River Near Carnation | 1,430 cfs | → |
| Mercer Creek Near Bellevue | 12 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Issaquah Highlands Npe Pond.
Boat launches
- Northeast Tolt Hill Road 30348-30762, Carnation
- Southeast Fish Hatchery Road 36495-37159, Fall City
- Lake Langlois Road Northeast King County
- West Lake Sammamish Parkway Northeast Redmond
- I 90 Trail Bellevue
- Mercer Island Boat Launch
Campgrounds
Paddle runs
- Snoqualmie Falls To Plum's Landing
- Confluence With Taylor River To Confluence With North Fork Snoqualmie River
- Wagner Bridge To Confluence With Middle Fork Snoqualmie River
- Quartz Road To Confluence With Middle Fork Snoqualmie River
- Alpine Lakes Wilderness Boundary To Quartz Creek Road
- Outlet Of Snoqualmie Lake To Alpine Lakes Wilderness Boundary
Track Issaquah Highlands Npe 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 Issaquah Highlands Npe Pond
Where does the data for Issaquah Highlands Npe 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 Issaquah Highlands Npe Pond.