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Visions for the Cosumnes River, excerpts from "ECOSYSTEM RESTORATION PROGRAM PLAN - VOLUME 2- ECOLOGICAL MANAGEMENT - Final Programmatic EIS/EIR Technical Appendix, July 2000" June 30, 2000 Author(s): Publisher: CA Bay Delta Authority (CBDA) Abstract/Description: ***This document comes from pages 335-340, and is available in its entirety at: http://www.calwater.ca.gov/Programs/EcosystemRestoration/EcosystemVol2RestorationPlan.shtml The vision for the Cosumnes River Ecological Unit is to restore floodplains, seasonally flooded habitat, tidal wetlands, splittail and chinook salmon rearing habitat,sandhill crane habitat, and a riparian plant community. The fall-run chinook salmon population can be sustained through improvements in streamflow, channel and floodplain morphology, spawning and rearing habitat, fish passage at diversion dams, and reducing losses to unscreened diversions and illegal harvest. The vision for the Cosumnes River includes improved streamflow and riparian habitat, modified floodplain and channel conditions, reduced fish passage problems and unscreened diversions. These actions will improve habitat conditions for fall-run chinook salmon and other wildlife species. The flow regime is the primary factor affecting the size of the Cosumnes River salmon run. In drier years, the early portion of the run experiences difficulty negotiating the shallow bar and shoal areas. Although there are only minor water storage reservoirs on the Cosumnes River, streamflows are reduced by numerous small water diversions and the lowering groundwater table. Most water is diverted from the first rains,in the fall through early summer,coinciding with instream flow needs for fall-run chinook salmon. Minimum instream flow during the salmon spawning and rearing season may be needed. Additional streamflow is needed in dry and normal years to ensure survival of downstream migrating juvenile salmon. Also important to restoration will be removing existing levees and constructing set back levees, implementing improved land management and livestock grazing practices along stream/riparian zones, fish passage improvements at small dams, screening water diversions, and improving gravel recruitment and riparian habitats. Riparian and aquatic habitat quality and distribution will be improved by expanding the width of the river floodplain through a program of levee setbacks. In combination with other efforts to improve floodplain safety and levee management on the lower Cosumnes River, levee setbacks will allow natural river meanders to form and associated habitats to thrive. Greater floodplain width between levees reduces the need for channel straightening and bank armoring at the expense of aquatic and riparian habitat. Flood- plain land could continue to be farmed within the levees, or conservation easements could be acquired to expand riparian forest and seasonal wetland habitats along the river. Sandhill crane roosting and foraging habitat in the lower Cosumnes River will be protected by land acquisition through in-fee purchase or easement. ...

ZPTzyWEIJBpvpq Author(s): Bruce MacFarlane, Elizabeth Norton Clikapudi Watershed Analysis July 04, 2000 Author(s): Fall River Watershed Area Study Tech May 31, 1983 Author(s):