The Cities of Aberdeen and Hoquiam are now developing a coordinated approach to reduce flooding, promote community development, and support salmon recovery efforts. The Cities are taking a two-pronged approach to develop a Coastal Resiliency Master Plan and design a protective levee system. The communities are impacted by a complex interaction of different types of flooding: Coastal flooding—driven by the combination of high tides, low pressure, and strong winds. This is the highest flood source and the primary factor in determining the FEMA flood zones.  Riverine flooding—interactions of elevated flows in the Chehalis, Wishkah, and Hoquiam Rivers  Small drainage flooding—occurs when urbanized, straightened streams overtop their banks during high rainfall events.  Localized flooding—excessive rain events overwhelm the stormwater drainage system. These local efforts align with the regional work of the Chehalis River Basin Flood Authority and will result in both a Master Plan and preliminary design and approval of a levee system.