South Puget Sound Salmon Enhancement Group completed a feasibility study and conceptual alternative analysis to replace the culvert restricting fish passage and tidal flow at the mouth of Crescent Creek, a direct tributary to Puget Sound. Crescent Creek flows approximately three miles from Crescent Lake to Gig Harbor. Crescent Creek enters Puget Sound in the northeast corner of Gig Harbor through an undersized culvert under 96th Street NW/Vernhardson Street. Crescent Creek supports fall Chinook salmon, winter steelhead, fall chum and Coho. The culvert restricts tidal flow, inhibits fish passage at tidal elevations below 9 feet (MLLW), and fragments the estuary. This project completed a feasibility study to evaluate fish passage, tidal hydrology, and estuarine function and prescribes design alternatives for a range of structures retrofit or replacements options to improve fish passage and tidal hydrology. This project was identified as a priority by the WRIA 15 Prioritization and Development project (06-2271) and the West Sound Watershed salmon recovery work plan.