The proposed project consists of the repair and restoration of existing water diversion structures on Mill Creek, tributary to Sonoma Creek. The diversion structures were damaged by the 2005-2006 winter storms. The project includes the excavation and removal of accumulated sediment from 250 to 450 feet of the stream channel. The removed material will be screened and placed in a row of gabion wire baskets along the west bank of the stream to provide long-term bank protection and to reduce the need to export material from the canyon. The existing bypass culvert will be re-exposed and cleaned out so that it can once again carry stream flows around the pipeline support columns. A line of one-ton rocks will be placed along the outer edge of the gabion baskets to protect the wire baskets from erosion and abrasion. The gabion structure will also be covered with a layer of soil and channel bed material to improve the chance of revegetation. An old, no-longer functional, diversion structure located just upstream of the current diversion structure will be partially removed to allow better sediment and debris transport through the stream. A portion of this structure will be left in place to maintain the stability of the stream bed. Issuance of a Streambed Alteration Agreement Number 1600-2006-0654-3 is pursuant to Fish and Game Code Section 1602.
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