High Point Redevelopment Stormwater Dam Reservoir Report
Last Updated: December 15, 2025
The High Point Redevelopment Stormwater Dam in Seattle, Washington stands as a significant asset for flood risk reduction along Longfellow Creek.
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Summary
Constructed in 2006 by SvR Design Company, this private dam serves a critical function in protecting the surrounding area from potential flood events. With a hydraulic height of 15.5 feet and a structural height of 15 feet, the dam provides essential storage capacity of 22 acre-feet to manage stormwater runoff effectively.
The dam's purpose is primarily flood risk reduction, with a high hazard potential due to its location and function. Despite this, the condition assessment as of August 2016 reported it as satisfactory, indicating that it is well-maintained and capable of meeting its intended purpose. The state-regulated dam is subject to inspections every five years to ensure its continued safety and functionality, with the last inspection taking place in August 2016. With its critical role in protecting the community from flooding, the High Point Redevelopment Stormwater Dam serves as a vital infrastructure asset in the region's water resource management and climate resilience efforts.
As climate change continues to impact weather patterns and increase the frequency of extreme weather events, the importance of well-designed and maintained stormwater infrastructure like the High Point Redevelopment Stormwater Dam cannot be overstated. With its strategic location along Longfellow Creek and its effective flood risk reduction capabilities, this private dam stands as a valuable resource in Seattle's efforts to mitigate the impacts of climate change on its water resources. As such, ongoing monitoring, maintenance, and regulatory oversight are essential to ensure the continued effectiveness and safety of this critical infrastructure asset.
Year Completed |
2006 |
River Or Stream |
Longfellow Creek - offstream |
Primary Dam Type |
Earth |
Surface Area |
1 |
Hydraulic Height |
15.5 |
Drainage Area |
0.2 |
Nid Storage |
22 |
Structural Height |
15 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
16 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Duwamish River At Golf Course At Tukwila
|
6700cfs |
Cedar River At Renton
|
5160cfs |
Mercer Creek Near Bellevue
|
12cfs |
Mill Creek Near Mouth At Orillia
|
44cfs |
Spring Brook Creek At Orillia
|
7cfs |
Thornton Creek Near Seattle
|
41cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
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. Investigations and studies are necessary.
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.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams 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, environment 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.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
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High Point Redevelopment Stormwater Dam
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