CITY OF DES MOINES SHORELINE MASTER PROGRAM

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Des Moines Shoreline Inventory and Characterization shoreline has been armored or otherwise modified from historic conditions. These figures are consistent with the level of armoring within the City of Des Moines. Approximately 75 percent of the City’s shoreline has been modified by riprap, concrete bulkhead, or wooden bulkhead. Table 6 displays the predominant types of shoreline armoring and approximate percentage of shoreline armored in each of the shoreline planning segments, based on review of 2001 oblique aerial photos and limited field reconnaissance. Table 6. Shoreline Armoring by Segment Segment Length (ft.) Modified Shoreline* Description of Armoring** Segment Length Percent A 859 859 100% Rip-rap boulders at north end of park and surrounding mouth of Des Moines Creek. Concrete bulk-head and retaining wall, and unused concrete boat ramp at south end of park. B 7,931 7,931 100% Concrete bulkhead and retaining wall for the parking lot at the Marina. Marina breakwater is boulder rip-rap. C 8,412 4,247 50% Majority of segment is contiguous concrete bulkheads associated with residential development, interspersed with boulder rip-rap bulkheads and few wooden bulkheads. South of S. 240th Street, areas at base of bluff have unmaintained boulder bulkheads that have begun to washout. D 1,241 885 71% North end and majority of park has boulder rip-rap with concrete acting as bulkhead and retaining wall for filled area. Both sides of McSorely Creek mouth is armored with boulder rip-rap. South of creek beach is unarmored. E 8,656 6,689 77% North end of segment has development on top of bluff and limited bulkheading at the base of bluff. Areas with development at base of bluff have fill areas with lawn and associated concrete and boulder retaining walls/bulkheads. Concrete bulkheading to support road near mouth of Woodmont Creek. South of creek is predominantly concrete bulkheads for residential properties. F 521 506 97% Contiguous concrete bulkhead throughout associated with roads, boat launch, and over water structures at Redondo. G 3,096 2,903 94% Contiguous concrete bulkhead throughout associated with Redondo Beach Dr. and boardwalk. Total 30,716 24,019 75% * Based on WDNR ShoreZone Inventory; ** Based on review of 2001 oblique aerial photography and field reconnaissance. Docks, Piers, and Over-Water Structures Overwater structures include floating docks, covered moorage, piers, or marinas. Overwater structures are typically located in the nearshore. They change the levels of light, shoreline energy regimes, substrate type and stability, and water quality (Nightingale and Simenstad, 2001). These changes result in alterations in the abundance and diversity of species in the Page 28 March 2005
Des Moines Shoreline Inventory and Characterization nearshore. Overwater structures, such as piers and breakwaters, can also alter wave energy and sediment dynamics that affect plant propagation, fish foraging, spawning and migration, and shellfish settlement and rearing. Additionally construction materials associated with overwater structures can leach contaminants into the nearshore environment. Along with these direct effects, a number of indirect effects result from some overwater structures as well. Covered moorages and boathouse are associated with cleaning, pesticide, herbicide, paint, petroleum, and other maintenance products entering the water (Nightingale and Simenstad, 2001). The water quality within the Marina is affected by boat engine exhaust, fuel spills, sewage discharge, and contaminated stormwater runoff coming from adjacent parking lots (KCDNR, 2001). According to the Washington State Department of Natural Resources ShoreZone Inventory (2001), there are 191 docks and piers in all of WRIA 9 and 81 docks and piers along the mainland shoreline (excludes Elliot Bay and Vashon/Maury). Within the City of Des Moines, the most significant overwater structures are associated with the Des Moines Marina (Segment B). The Marina covers approximately 8,600 feet of the shoreline and includes an approximately 650–foot long fishing pier; docks; and covered and uncovered slips. The Redondo area (Segment F) has several overwater structures as well, including a restaurant on pilings, a pier and research facility, a public fishing pier, and a boat launch with associated loading pier. March 2005 Page 29
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CITY OF DES MOINES SHORELINE MASTER PROGRAM

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