Alternative 3

Greater Geographic Extent with Increased Level of Protection, Integrated Habitat and Recreation, Agricultural Protection Facilities, and Habitat Restoration Project Partnerships Alternative

Click to enlarge map of Alternative 3.

Click to enlarge map of Alternative 3.

Under Alternative 3, the District would build approximately 30 miles of new or improved facilities to meet the 500-year level of protection. This would include 17 miles of existing PL 84-99 Program levees and approximately 13 miles of new levees (3 miles in the same locations as under Alternative 2 and 10 miles of new levees). This alternative also includes 2 miles of nonstructural improvements. Under Alternative 3, the District would also implement all of the Interim SWIF-identified capital projects. Agricultural land would receive drainage improvements, and agricultural structures would be flood-proofed to achieve the same level of protection as they currently have. Under this alternative, the District could also provide incentives for partnership funding to create habitat restoration opportunities within Water Resource Inventory Area 9. The District anticipates that this alternative would include more real estate acquisitions than Alternative 2.

New levees would be constructed in the following areas:

  • Shoreline gaps on the right bank of the Lower Green River between PL 84-99 Program levees in Kent and Tukwila (approximately 2 miles).

  • The left bank of the Lower Green River in Tukwila (approximately 0.6 mile).

  • The left bank of the Lower Green River in Auburn (approximately 0.5 mile).

  • Further expansion of the levee system by 10 miles.

Alternative 3 would include the construction of the following new or improved facilities:

  • Type A facility: approximately 15.43 miles (49 percent of the facilities).

  • Type B facility: approximately 5.39 miles (17 percent of the facilities).

  • Type C facility: approximately 9.08 miles (29 percent of the facilities).

  • Type D facility: approximately 1.91 miles (6 percent of the facilities).

The map above shows potential locations of facility types under Alternative 3.