CITY OF DES MOINES SHORELINE MASTER PROGRAM

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Des Moines Shoreline Inventory and Characterization DATA GAPS AND RECOMMENDATIONS The following items have been identified as data gaps or additional information that would enhance the shoreline inventory and characterization. Where possible, recommendations are provided to address data gaps as the City moves forward with the comprehensive update of its Shoreline Master Program. • Additional information and analysis on stream sediment regimes for the City’s larger streams (Des Moines, Redondo, Massey and McSorley) would provide a base level of information for understanding past and current sediment regimes and would better inform shoreline management and restoration options. • More information and analysis on range of stream flow variability, including the timing, magnitude and spatial distribution for peak high and low flows for the city’s larger creeks (Des Moines, Redondo, Massey and McSorley Creeks) would provide a base level of information for understanding past and current flow regimes. Data collected under the City’s water quality monitoring program is a good start, but has only been collected on Des Moines, Massey, and the North Fork of McSorely Creek. • Improved mapping of the extent and location of beaches, backshore, flats, and subestuaries would better inform the evaluation of site-specific restoration opportunities. • Mapping of marine riparian zones has not been completed. Mapping of eelgrass beds is available, but not at a detailed scale. Improved mapping would better inform the overall management of habitat areas in the City. • A more detailed inventory and description of vegetation types and species composition found in marine riparian zones and subestuaries would better inform the overall management of habitat areas in the City. This could be accomplished by additional field reconnaissance. Page 54 March 2005
Des Moines Shoreline Inventory and Characterization CONCLUSIONS The Puget Sound shoreline in the City of Des Moines is characteristic of urbanized waterfront development elsewhere in the region. Public access to the shoreline, recreational opportunities, and water-oriented uses such as boating and fishing abound in Des Moines. In this regard, goals of the Shoreline Management Act related to public use and enjoyment of the state’s shorelines have been met well in the City. However, the natural structure and functions occurring at the shoreline have been significantly altered through structural development of bulkheads and riprap revetments throughout most of the city’s shoreline. These changes have altered the natural net-shore drift direction and the availability and distribution of beach sediment locally. Additionally, development on a watershed scale has affected the shoreline by increasing impervious area in uplands, resulting in increased peak flow velocities and volumes, impaired water quality, and erosion in streams that discharge to Puget Sound. Site-specific opportunities to protect, enhance, or restore shoreline functions appear to be concentrated at stream mouths, with many of those occurring in public parks. The type of opportunities at these locations would likely benefit habitat for salmonids, particularly when coordinated with upstream projects targeted to reduce localized flooding and improve fish passage such as culvert replacement projects. These site-specific projects would likely have a marginal effect on restoring ecosystem wide processes, particularly nearshore coastal processes, since so much of the city’s shoreline is structurally modified, but would still be important and valuable efforts toward habitat enhancement and restoration of impaired ecological functions. March 2005 Page 55
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CITY OF DES MOINES SHORELINE MASTER PROGRAM

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