DESCRIPTION
The
proposed Corps 1135 Ecosystem Restoration Gap to Gap project is to setback,
upgrade and certify the former DID 1 levee as a County levee built to federal
standards, fill in floodplain gravel pits and open up larger areas of
formerly abandoned and disconnected floodplain. The project directly returns
river accessibility to 640 acres of high grade floodplain on left bank and
300 acres on the right bank below the WWTP from levee removal as well as
initiate other restoration actions including a 1300 foot channel. The FbD
grant proposal is to implement 5 of the 13 Corps selected Section 1135
Ecosystem Restoration measures that exceeded the available federal funds of
$13.3 million.
1. Removing approximately 140,000 cubic yards of coarse armored bar
sediments developed by the high velocities along the levee in two locations
that cause meander lock, increased attack on the opposite bank levee and
habitat simplification (1135 measures 3.0 and 5.0 ),
2. Setting back a 700-foot portion of the right bank Yakima Federal Project
levee, removing an abutment and mid-river pier structure from a failed bridge
that produce channel simplification and fixedÂ
redirection (1135 measure 3.0 ),
Under measure 3.0 the levee setback will move 3 acres into the active
channel and allowing an additional 3 acres of backwater floodplain
immediately upstream of SR12 bridge to be activated
3. Excavating a 1,300-foot pilot channel to reconnect Yakima River flows to
lower Blue Sl