CITY OF DES MOINES SHORELINE MASTER PROGRAM

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Des Moines Shoreline Master Program This page left intentionally blank Department of Ecology approval effective November 1, 2010 12 Adopted by City of Des Moines Ordinance No. 1502
Des Moines Shoreline Master Program CHAPTER 2 – <strong>SHORELINE</strong> INVENTORY AND CHARACTERIZATION – SUMMARY <strong>OF</strong> FINDINGS 2.1 Background and Purpose Cities and counties updating their SMP are required to prepare an inventory and characterization of the shoreline resources in their jurisdiction. As part of the City’s SMP update, an inventory and characterization report and map folio was prepared in the fall of 2004 and finalized in the spring of 2005, following Des Moines Planning Agency and Ecology review. The complete report is incorporated as Appendix A of this SMP. The purpose of the study was to conduct a baseline inventory of conditions in the shoreline jurisdiction of the City of Des Moines. The inventory and characterization provides a basis for updating the City’s SMP to comply with the SMA, Revised Code of Washington (RCW) 90.58 and its implementing guidelines, Washington Administrative Code (WAC) 173-26. The characterization identifies existing conditions, evaluates functions and values of resources in the shoreline jurisdiction, and explores opportunities for conservation and restoration of ecological functions. The findings are intended to provide a framework for updates to the City’s shoreline environment designations, and shoreline management goals, policies, and development regulations. Key findings of the inventory and characterization are summarized below. 2.2 Physical & Biological The City of Des Moines is located in the central portion of Puget Sound in the Puget Lowland ecoregion. The Des Moines area watershed includes Des Moines Creek, Massey Creek, McSorley Creek, Woodmont Creek, Redondo Creek, and Cold Creek drainage basins. This watershed is controlled by a maritime climate, lakes and local closed depressions occupied by wetlands and bogs with short streams flowing directly to Puget Sound. Land use in the watershed includes medium to high density residential and commercial development. Large areas of native vegetation are found within steep sloped ravines along streams. Surface and groundwater movement are controlled by wetlands and considerable impervious surface. This impervious surface increases peak stormwater flow. Steep receding bluffs are located along much of the Des Moines shoreline, with sediments accumulating at the base of the bluffs protecting the bluffs from further erosion and reducing bluff recession. As these sediments enter the intertidal zone, they are subject ot transport by waves and water currents to downdrift beaches. Net-shore drift north of Woodmont is northerly and south of Woodmont is southwesterly and a transition zone occurs near Saltwater State Park. Just north of the Des Moines marina, there is also a short shoreline section with net-shore drift to the south. Bluffs, beaches, and the mouths of several freshwater streams characterize the City’s shoreline. Approximately 75 percent of the City’s shoreline has been modified with riprap, concrete or wooden bulkheads, including the marina. These structures ultimately limit the amount of sediment transported from upland areas to the beach, and are known to cause erosion and loss of some habitats such as sand and fine gravel beaches. Currents naturally move sediments across the beach and alongshore in continual cycles, but these structures cut off the natural supply and distribution of sediments, causing a change in sediment composition within the nearshore area, Department of Ecology approval effective November 1, 2010 Adopted by City of Des Moines Ordinance No. 1502 13
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CITY OF DES MOINES SHORELINE MASTER PROGRAM

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