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4.3 Site 3 <br />The objective at this site is to restore a proper riverine ecosystem to a heavily disturbed reach, <br />from gravel mining, of the river. <br />Three scales of restoration aze presented for Site 3. Restoration elements common to all three <br />scales include: <br />• Channel Reconstruction <br />• Bank Stabilization and Revegetation <br />• Boulder Structures <br />• Irrigation Diversions <br />• Floodplain Revegetation <br />4.3.1 Site 3, Scale 1 Description <br />Meanders would be restored to the first 4,4001inear feet of the site from the south property line <br />upstream through the two instream gravel pits. In addition to the channel realignment, <br />approximately 7 acres of floodplain grading and revegetation are proposed to rehabilitate the in- <br />stream gravel pits. Bank stabilization in this area will consist of 20 j-hooks and 2,000 bundles of <br />willows. <br />The Vandiford Ditch will be reconstructed with a permanent concrete headgate and low-head <br />rock diversion structure to limit annual bulldozing and improve diversion efficiencies. In <br />addition, the diversion will be designed to allow for fish passage in the river, past the rock <br />diversion. The initial 4 vertical feet from the diversion structure will be broken up by two, 2-foot <br />drop/pool rock structures to facilitate fish passage under low flows and stabilize the channel. <br />The existing pond created by the off-stream pit will be connected to the river by a backwater <br />channel for additional habitat enhancement. Six addition j-hooks will be constructed between <br />the existing channel and the off-stream pond between stations 252+50 and 257+50 to prevent <br />future channel avulsion and enhance habitat. <br />An additional 1,550 linear feet of channel realignment will begin at station 278+00 to add .- <br />sinuosity to the channel and reduce gradient. The new channel will be stabilized with 9 <br />additional j-hooks and another 1,000 bundles of willows. <br />4.3.2 Site 3, Scale 2 Description <br />The primary impacts at this site lie between the south boundary and the north end of the existing <br />gravel mining area at the off-stream pond site. Therefore, Scale 2 will concentrate its efforts in <br />these azeas. The new channel layout in this azea has been changed from its initial proposal in <br />Scale 1 to a slightly different alignment which better utilizes the existing channel and preserves <br />more of the existing vegetation. This new alignment will also allow for less placement of topsoil <br />and better efficiency in the placement of upland trees and shrubs. <br />31 <br />