CITY OF DES MOINES SHORELINE MASTER PROGRAM

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Des Moines Shoreline Inventory and Characterization Table 9. Shoreline Segment “A” Summary Land Use / Transportation Stream Discharges Public Shoreline Access Hazard Areas Habitat / Habitat Potential Park: 75%, Single- Family Res.: 17%, Vacant: 9%; Park access, foot paths, beach/auto access Des Moines Creek Des Moines Beach Park Erosion, Flood Wetlands, Stream, Fish and Wildlife Areas (Salmonids, shorebirds and piscivorous birds, heron rookery, shellfish, eelgrass) Shoreline functions within Segment A have been impacted by the following activities: • Shoreline armoring including riprap (includes mouth of Des Moines Creek) and concrete bulkheads; • Removal of marine riparian vegetation; • Increased impervious surface within the Des Moines Creek basin at a watershed scale; and • Changes to the direction of net-shore-drift caused by the Marina (Segment B). Effects upon the nearshore environment include: • Sediment supply to nearshore areas cut off by riprap and concrete bulkheads; • Marine riparian vegetation provides wildlife habitat, microclimates (shade/prey), source of large woody debris, bank stability, improvements to water quality; • Subestuaries and deltas depend upon rainfall to bring sediments from upstream to the nearshore area. High flow rates and volumes resulting from increased runoff from impervious surface can alter the formation and function of these features; and • Net-shore drift is the long-term direction of sediment transport along the shoreline. The construction of the Des Moines Marina (Segment B) has altered this natural process. Opportunities to improve shoreline functions within Segment A are identified as areas A-1 and A-2 (Figure 15). Opportunity Area A-1 and A-2 Opportunities in area A-1 could include the removal of the failing riprap revetment from the mouth of Des Moines Creek north to the northern City boundary and the removal of riprap from the mouth of Des Moines Creek. The artificial shoreline could be pulled back a bit with riprap replaced with alternative “soft shore protection” techniques. Such “biotechnical” or “bioengineering” techniques could include imported gravel and sand, anchored drift logs or other large woody debris and , combined with marine riparian plantings along the shoreline and on the north side of Des Moines Creek. This would allow sediment to migrate from upland areas to the shoreline, improve subestuary and delta functions, and increase habitat quantity and quality for both terrestrial and aquatic animals using the shoreline, as well as expanded beach recreation. Page 40 March 2005
Des Moines Shoreline Inventory and Characterization Opportunities in area A-2 could include the removal of the existing concrete bulkhead and former boat ramp. The bulkhead could be replaced with soft shore protection techniques and marine riparian plantings, but this would require removal of some fill material that is currently at the site. A pocket beach could be created that would be largely in the shelter of the marina breakwater. This would improve the subestuary and delta as well as provide additional aquatic (including forage fish spawning habitat) and terrestrial wildlife habitat. Prior to implementing changes to the nearshore area, upstream CIP’s related to stormwater detention and treatment need to be completed. The lower portions of Des Moines Creek experiences flooding during major storm events, and construction of restoration projects prior to flood control projects could prove costly to repair. It should also be noted that some Normandy Park residents to the north can only access their homes via the beach area in Segment A. Plans would have to maintain access for these residents. March 2005 Page 41
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CITY OF DES MOINES SHORELINE MASTER PROGRAM

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