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- -v- .'-` Snohomish Riverbank
<br /> ,� - The Public Amenities Master Plan proposes to retain the
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<br /> / Snohomish riverbank, from Lowell Riverfront Park north
<br /> tthrough Wetland C, in much the condition it exists today,
<br /> • although some changes are anticipated. The private
<br /> developer will remove approximately 50 pilings from the
<br /> a. .- river as part of required mitigation efforts. The Public
<br /> • Amenities Master Plan proposes substantive
<br /> --?-:-.. .,-;%`-.-'-.7.---- modifications and excavations in the vicinity of the new
<br /> S Bigelow Creek outlet, at the mouth of Walton Creek, and
<br /> t where the new Wetland C channels will join the river. The
<br /> remaining shoreline in this area will remain undisturbed
<br /> Old industrial pilings maybe removed where and/or will be enhanced with supplemental planting:
<br /> riverbank stabilization strategies are used. existing piles, bulkheads, and timber cribbing will typically
<br /> f ,.; r remain in place, excepting three locations where
<br /> '� = 's ' ,;.. riverbank failures, large- and small-scale slumps, now
<br /> } , -~'' i• ' threaten trails and other facilities. These failures, noted on
<br /> a= °Y' s 'x the site analysis plan, require stabilization of the bank in
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<br /> >,;f� 3 �� : di �,,k . the 1�Lowell Riverfront Park area, near the outfall of the
<br /> r Sa '' -2-7,4-%i:-::4,,; -• '� ,• `'. t r;h i`?4�`°� WSDOT stormwater treatment facilities, and at the
<br /> Vl' ,-41.1-_- ;. .,- . northeast corner of the Simpson Pad. At the last location,
<br /> Alfi3. 1.1:1,11i I k: • the preferred alternative to stabilization measures and
<br /> �t��� �l �f I .444 • ,1! their adverse impacts is the re-alignment of the trail
<br /> :_ g . , inland, allowing the shoreline edge and adjacent wetlands
<br /> 3 , ... ''' to be re-vegetated and returned to a more natural, less
<br /> - maintenance-intensive, condition.
<br /> Some pilings to remain in place to provide Two areas where the master plan proposes extensive
<br /> stability and minimize wave action erosion. shoreline modification are at the 3-Acre Park site and at
<br /> Lowell Riverfront Park, The bank at the 3-Acre Park site is
<br /> currently near-vertical and is armored by a combination of
<br /> "•... , ., wood piles, cribbing, sheet metal, and riprap. Similarly,
<br /> J, the shoreline condition at the Lowell Riverfront Park site
<br /> { y.;.,,-. ` . has been degraded by a combination of failing bank
<br /> - . armoring, human-induced erosion, and river hydraulics.
<br /> I, f s . , `, The Public Amenities Master Plan proposes removal of
<br /> %--•114'”,,f1.‘ —..-=3 .i' ='.:,,,,,,,„; the existing armoring along the shoreline at both park
<br /> ` -'"" sites to the extent allowed by river hydraulics and the
<br /> -- �'`�- upstream and downstream bank conditions, and the
<br /> — r1 restoration of a 50-foot riparian native plant zone along
<br /> ,,,,L.71..,.---: . — _ ,. the water's edge. Pedestrian access at both parks will be
<br /> l YY, 4 -
<br /> • allowed at controlled locations, but much of the shoreline
<br /> at both park sites will be restored to native scrub-shrub
<br /> Naturally occurring large woody debris is
<br /> visible at low tide. and riparian forest conditions.
<br /> Although extensive shoreline modifications in most areas outside the two park sites are not included in
<br /> the Public Amenities Master Plan, plan elements will be implemented so as not to preclude future
<br /> shoreline enhancements. Such work could include the removal of some or all of the extensive system
<br /> of piles, bulkheads, and cribbing, and other material that remains from earlier industrial uses, in those
<br /> locations where removal would not adversely affect existing or proposed amenities. In some areas
<br /> along the river the pilings continue to effectively armor the riverbank, protecting upland amenities; site
<br /> disturbance caused by piling removal could lessen the current stability and create adverse ecological
<br /> impact during the process of removal.
<br /> 22 Riverfront Development Public Amenities Master Plan
<br /> 59
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