Bellevue Detention Pond 165 dam
Bellevue Detention Pond 165
Bellevue Detention Pond 165, also known as Northrup Lane Dam Dmp 165, is a crucial infrastructure owned by the local government in Bellevue, Washington. This detention pond plays a key role in flood risk reduction and debris control along the West Tributary Kelsey Creek. Constructed in 1983, this earth dam stands at a hydraulic height of 16 feet and a structural height of 12 feet, with a storage capacity of 73 acre-feet. The dam's primary purpose is to mitigate the risk of flooding in the area, making it a vital asset for the community.
Managed by the Washington Department of Ecology, Bellevue Detention Pond 165 is regulated and inspected to ensure its structural integrity and functionality. With a low hazard potential and a condition assessment of "Not Rated," the dam serves as a reliable barrier against potential water-related disasters. Despite not having a specific spillway type or outlet gates, the dam's design and construction using stone core and rock foundations demonstrate its effectiveness in managing water flow and reducing flood risks in the region.
Located in King County, Washington, Bellevue Detention Pond 165 is a testament to the proactive approach taken by local authorities to safeguard against water-related emergencies. With a drainage area of 0.68 square miles and a maximum discharge capacity of 31 cubic feet per second, this detention pond stands as a critical piece of infrastructure in the community's overall water resource and climate resilience strategy.
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 Bellevue Detention Pond 165 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Mercer Creek Near Bellevue | 12 cfs | → |
| Thornton Creek Near Seattle | 41 cfs | → |
| Issaquah Creek Near Mouth Near Issaquah | 44 cfs | → |
| Cedar River At Renton | 339 cfs | → |
| Duwamish River At Golf Course At Tukwila | 6,700 cfs | → |
| Snoqualmie River Near Carnation | 1,430 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Bellevue Detention Pond 165.
Boat launches
- I 90 Trail Bellevue
- West Lake Sammamish Parkway Northeast Redmond
- Mercer Island Boat Launch
- Sammamish River Trail Redmond
- Adams Street Boat Ramp
- Stan Sayres 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
- Alpine Lakes Wilderness Boundary To Quartz Creek Road
- Quartz Road To Confluence With Middle Fork Snoqualmie River
- Confluence Of Tye And Foss Rivers To Gold Bar
Track Bellevue Detention Pond 165 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 Bellevue Detention Pond 165
Where does the data for Bellevue Detention Pond 165 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 Bellevue Detention Pond 165.