Issaquah Highlands Np2 Pond Dam dam
Issaquah Highlands Np2 Pond Dam
The Issaquah Highlands Np2 Pond Dam, located in Issaquah, Washington, was completed in 2002 by Concept Engineering for the primary purpose of flood risk reduction along the NF Issaquah Creek. This earth dam, with a hydraulic height of 28 feet, serves to store water during periods of heavy rainfall and mitigate potential flooding in the surrounding area. The dam has a normal storage capacity of 19 acre-feet and a maximum storage of 24 acre-feet, covering a surface area of 2 acres with a drainage area of 0.06 square miles.
Managed by the Washington Department of Ecology, the Issaquah Highlands Np2 Pond Dam is subject to state regulation, inspection, and enforcement to ensure its structural integrity and safe operation. The dam has been assessed to be in fair condition with a high hazard potential, prompting regular inspections every five years to monitor its performance. Despite its critical role in flood risk reduction, the dam has not been modified since its completion, highlighting the importance of ongoing maintenance and monitoring to ensure its effectiveness in protecting the local community from potential water-related disasters.
The presence of the Issaquah Highlands Np2 Pond Dam underscores the proactive approach taken by local government agencies in Washington to manage water resources and address climate-related challenges in the region. As a key component of the flood risk reduction infrastructure along the NF Issaquah Creek, this dam serves as a critical protective barrier against potential inundation, highlighting the importance of sustainable water management practices in safeguarding communities and ecosystems against the impacts of changing climate patterns.
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 Np2 Pond Dam -- 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 Np2 Pond Dam.
Boat launches
- Southeast Fish Hatchery Road 36495-37159, Fall City
- Northeast Tolt Hill Road 30348-30762, Carnation
- Lake Langlois Road Northeast King County
- I 90 Trail Bellevue
- West Lake Sammamish Parkway Northeast Redmond
- 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 Np2 Pond 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 Issaquah Highlands Np2 Pond Dam
Where does the data for Issaquah Highlands Np2 Pond 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 Issaquah Highlands Np2 Pond Dam.