The proposed restoration project will replace an existing 6 foot (ft) wide by 4 ft tall by 66 ft long corrugated steel squash pipe with a 20 ft wide by 13 ft tall by 78 ft long split box culvert at Lucas Creek Road milepost 4.39 in Lewis County, Washington. The barrier to be replaced, which conveys an unnamed tributary to Lucas Creek, is only 33 percent passable due to a slope 1.7 percent.  The "Prioritized Chehalis Barriers - May 2020" layer in the Chehalis Fish Passage Barrier Prioritization Interactive mapper (May 2020) identifies the existing barrier as a Priority 1 barrier.  Replacement of this culvert is anticipated to restore unimpeded access to 1.88 linear miles of potential habitat for the Southwest Washington ESU of coho salmon and 1.74 linear miles of potential habitat for the Southwest Washington DPS of winter steelhead trout. Additional construction will include 122 feet of realignment/regrade of stream material within the channel to provide passage during all flows.  Channel regrade activities were limited to the minimum distance required to meet stream simulation design. There are no barriers downstream or upstream of this culvert. 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 restore access to 3,484 square meters of spawning area and 2,081 square meters of rearing habitat.