The project proposes to replace an existing 1.05 meter (m) (3 foot [ft]) diameter pipe , which is only 33 percent passable due to a water surface drop of 0.59m (1.94 ft), with a 7.32 m (24 ft) wide x 3.66 m (12 ft) tall split box culvert 21.34 m (70 ft) in length. According to the SWIFD layers provided in the Chehalis Fish Passage Barrier Prioritization interactive mapper (March 2020) replacement of this culvert will restore unimpeded access to 1.22 linear miles of potential habitat for the Southwest Washington ESU of coho salmon and 1.36 linear miles of potential habitat for the Southwest Washington DPS of winter steelhead trout. According to the Lewis Conservation District, who performed a full stream habitat survey of Lucas Creek and its tributaries in 2002, the proposed project will also restore access to 2,588 square meters of spawning area and 1,299 square meters of rearing habitat will also become accessible. The proposed project would improve fish passage, reduce sedimentation thereby improving water quality, and increase riparian cover.