Portions of West Canal, Middle River, Old River,
Victoria Canal, North Canal, and Grant Line Canal would
be dredged to improve conveyance and/or the operation
of private agricultural siphons and pumps. In total,
up to 300,000 cubic yards of material would be dredged
and spoiled within the south Delta. Dredging would be
conducted in the center of the channel to avoid wetland
plants and riparian habitat.
Dredging within the footprint of the gate would
be necessary to clear the channel bottom for gate placement.
Up to 150 feet upstream and 350 feet downstream from
each gate site would be dredged using a sealed clamshell,
as described below, to clear the area for construction
and placement of the gate. In total, up to 6,000 cubic
yards of material would be dredged at the gate sites.
The dredging of the upstream and downstream areas would
avoid sensitive habitats such as tidal emergent wetlands
and riparian areas. Dredging would occur between August
1 and November 30, lasting approximately 15 days at
each gate site (more...)