CITY OF DES MOINES SHORELINE MASTER PROGRAM

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Des Moines Shoreline Inventory and Characterization Opportunities to improve shoreline functions within Segment C are identified as areas C-1 and C-2 (Figure 15). Opportunity Area C-1 Opportunities in area C-1 could include the removal of riprap from the mouth of Massey Creek on the south bank (the north bank is currently part of the Des Moines Marina breakwater). The riprap could be replaced with soft shore protection techniques combined with marine riparian plantings along the shoreline and on the south side of Massey Creek. The breakwater on the south side of the boat ramp area is already riprapped and would not likely require any additional protection measures. With net shore-drift to the north in Segment C, the beach should continue to accrete such that erosion is not a threat here. Stream flow would need to be quantified to allow analysis of the expected amount of creek mouth closure as compared to salmon return periods. The removal of riprap would provide improvements to the subestuary and delta, and riparian plantings would increase habitat quantity and quality for both terrestrial and aquatic animals using the shoreline. The creation of a much larger estuary to provide additional habitat benefits would likely require purchasing the property and removing the building immediately south of the creek. 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 Massey Creek experiences flooding during major storm events, and construction of restoration projects prior to flood control projects could prove costly to repair. Implementing improvements to this area may be constrained by the fact that the land is privately owned. Page 44 March 2005
Des Moines Shoreline Inventory and Characterization Opportunity Area C-2 Opportunity area C-2 (not shown on Figure 15) is located at the existing South 239th public access area. It appears there is limited opportunity to improve natural shoreline functions due to the existing residential development, associated bulkheads, and presence of steep bluffs. However, the existing access area provides a walkway down to the waters edge, where the public can view the shoreline area. This would be an excellent opportunity to provide interpretive signs (wildlife education) or other Puget Sound shoreline educational materials. The City could explore developing additional street-end overlooks or beach access points similar to the South 239th Street Access. Undeveloped street-end right of ways in Segment C are located at South 240th Street and South 249th Street. Opportunity Area C-3 One failed bulkhead is present approximately at South 245th Street. (not shown on Figure 15). The wooden soldier pile wall is over a portion of the intertidal beach (CGS, in prep.) and is no longer functioning to protect the bluff from erosion. Simple pile removal would help restore natural beach conditions and bluff processes. Some of these may be creosoted piles, so additional water quality benefits could be reaped. March 2005 Page 45
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