TagDes Moines Creek Basin Plan(28)

Letter dated August 18, 2000 from Keith R. Smith, Water Resources Manager at Port Of Seattle (Seattle-Tacoma International Airport), to Jillian Hoyt of Seattle Public Utilities, regarding the Des Moines Creek Basin Plan Flow Augmentation Facility. The Port seeks to purchase water from SPU as an alternate supply for the proposed flow augmentation facility, which

In July 2000, the Port of Seattle submitted an Implementation Plan to the Washington Department of Ecology outlining a proposed flow augmentation facility for Des Moines Creek, located near Seattle-Tacoma International Airport. The plan described using water from a Port-owned well to increase stream flow to one cubic foot per second and reduce water temperatures to 16 degrees Celsius during summer low-flow periods, with the goal of improving water quality and aquatic habitat. The facility would involve reconfigured well pumps, an 800-foot pipeline, a stilling basin, and an automated monitoring station to regulate flow and temperature in the creek.

In July 2000, the Port of Seattle submitted an Implementation Plan to the Washington Department of Ecology outlining a proposed Des Moines Creek Flow Augmentation Facility near Seattle-Tacoma International Airport. The plan describes using water from a Port-owned well — currently used for golf course irrigation — to boost creek streamflow to at least one cubic foot per second and lower water temperatures to 16°C during summer low-flow periods. An automated monitoring station downstream would control pump operations, with a backup option to draw from the Port's municipal water distribution system if well water became unavailable.

In June 2000, the Port of Seattle submitted a formal application to the Washington Department of Ecology to add a new use to an existing groundwater right for a well located on Port property near Seattle-Tacoma International Airport. The well, originally drilled in the late 1940s and previously used to irrigate the Tyee Valley Golf Course, was proposed to also provide flow augmentation and temperature control for Des Moines Creek as part of a jointly funded basin restoration plan. The application addressed the well's ownership history, its continuous use for golf course irrigation since the mid-1960s, and the Port's agreement with Highline Water District confirming the Port's title to the associated water right (Certificate No. 2369).

This 1999 email chain between Washington State Department of Ecology officials discusses the 401 Water Quality Certification process for a major Port of Seattle project affecting Des Moines and Miller Creek watersheds near Sea-Tac Airport. Key disputes include stormwater discharge compliance with water quality standards, required mitigation measures such as riparian buffers and stream flow augmentation, and the retrofitting of existing stormwater outfalls. Officials warn that the creeks are already hydrologically impaired, with flood and erosion conditions far exceeding pre-development levels, making it difficult to approve the project without a comprehensive and specific mitigation package.

1997 Des Moines Creek Basin Plan, November 1997, prepared by the Des Moines Creek Basin Committee comprising City of SeaTac, City of Des Moines, Port of Seattle, and King County. Project technical team led by King County Department of Natural Resources, Water and Land Resources Division, with contributors including David Masters, David Hartley, Alan Johnson,

The 1997 Des Moines Creek Basin Plan is a collaborative watershed management document produced by the City of SeaTac, City of Des Moines, Port of Seattle, and King County. It addresses stormwater, drainage, and environmental conditions within the Des Moines Creek basin, an area significantly influenced by Sea-Tac Airport and surrounding urban development. The plan establishes coordinated strategies among the four jurisdictions to manage water quality and flooding in this shared watershed.

Figure 1 from the Des Moines Creek Basin Plan (1997), a map produced by DNR GIS/Cartography/Graphics Unit showing water features and potential wetland mitigation sites in the Des Moines Creek Basin. Covers areas including Burien, Normandy Park, SeaTac, Tukwila, Des Moines, Kent, and unincorporated King County. Map legend identifies basin boundary, streams, piped streams, wetlands,