DESCRIPTION
The City of Tukwila used funding to complete final design and permitting for a restoration project that when constructed will create shallow water habitat on a 2.16 acre site (and on adjacent WADNR aquatic lands) on the right bank of the Duwamish River immediately downstream of river mile 7.0. Restoration design calls for excavating 27,000 cubic yards of material to establish approximately 2.0 acres of shallow water mudflat and marsh habitat and approximately 0.8 acre of uplands planted with native vegetation.
The site is in the high priority "transition zone" of the Duwamish River, which provides the appropriate range of salinities for juvenile Chinook and chum to transition from fresh to salt water. Off channel and shallow water habitats in this stretch of the Duwamish are limited. When constructed (restoration is funded through project 13-1099) the area will provide opportunities for juvenile fish to move out of the main channel to habitats where they can feed and rear. Longer residence times in the estuary allow for larger, healthier smolts prior to ocean migration. The property is among the largest remaining pieces of under-developed sites for habitat restoration remaining in the Duwamish corridor. When restored, it will be the largest off-channel habitat between the Codiga Farms restoration at RM 8.5 and North Wind's Weir restoration at RM 6.4.