SCH Number 2008032110


Project Info

Title
Sediment and Wood Augmentation along the Trinity River Restoration Reach
Description
The Proposed Action would allow for wood placement to occur at the proposed winter-spring augmentation sites and at the existing augmentation sites to enhance the efficacy of sediment augmentation activities and improve aquatic resources, during the winter-spring augmentation period, which would generally occur between December 1 and May 1, to coincide with synchronized flow releases (October 15 – February 15) and winter elevated baseflow releases (February 16 – April 15). Winter-spring augmentation activities may occur as early as November 1 during extremely wet precipitation periods. These four proposed sediment and wood augmentation sites are located within the channel rehabilitation project environmental study limits (ESLs) at Dark Gulch, Trinity House Gulch, Steel Bridge, and Vitzthum Gulch and are referred to as the proposed winter-spring augmentation sites. The proposed project is needed to enhance existing habitat and provide new salmon and steelhead spawning and rearing habitat in the Trinity River below Lewiston Dam. The purpose of the project is to add suitable-sized sediment and wood through manual augmentation at up to four new potential sites. Sediment and wood augmentation would: Provide sediment and wood to the river that would help create natural bar, riffle, and pool sequences; Promote scour and fill processes that form bars and pools in the river channel; Provide juvenile rearing habitat in the active channel, including refugia from predators, as opposed to floodplain rearing habitat that is only available during high flows; Create and maintain areas suitable for adult salmon to lay eggs (also known as spawning beds for redd construction); Increase the topographic complexity of the river channel; Increase habitat for salmon prey, including macroinvertebrates associated with in-channel wood; Address the deficit of woody material in the Trinity River, which would increase the availability of organic matter in the channel and floodplain, help to develop and support diverse habitat; and Increase total natural occurring salmon population within the targe restoration reach.
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10 documents in project

Type Lead/Public Agency Received Title
California Regional Water Quality Control Board, North Coast Region 1 (RWQCB) Sediment and Wood Augmentation along the Trinity River Restoration Reach
California Regional Water Quality Control Board, North Coast Region 1 (RWQCB) Trinity River Channel Rehabilitation Sites - General 401 Water Quality Certification Reissuance IS
Regional Water Quality Control Board, Region 1 (North Coast), Santa Rosa Completion of Phase 1 Channel Rehabilitation Projects with Planned Phase 2 Channel Rehabilitation and Sediment Management Projects
Regional Water Quality Control Board, Region 1 (North Coast), Santa Rosa Trinity River Channel Rehabilitation Sites: Channel Rehabilitation Activities
Regional Water Quality Control Board, Region 1 (North Coast), Santa Rosa Trinity River Channel Rehabilitation Sites - General 401 Water Quality Certification Reissuance IS
Regional Water Quality Control Board, Region 1 (North Coast), Santa Rosa Channel Rehabilitation and Sediment Management for Remaining Phase 1 and Phase 2 Sites
Regional Water Quality Control Board, Region 1 (North Coast), Santa Rosa Completion of Phase 1 Channel Rehabilitation Projects with Planned Phase 2 Channel Rehabilitation and Sediment Management Projects
Regional Water Quality Control Board, Region 1 (North Coast), Santa Rosa Channel Rehabilitation and Sediment Management for Remaining Phase 1 and Phase 2 Sites
Regional Water Quality Control Board, Region 1 (North Coast), Santa Rosa Channel Rehabilitation and Sediment Management for Remaining Phase 1 and Phase 2 Sites
Regional Water Quality Control Board, Region 1 (North Coast), Santa Rosa Channel Rehabilitation and Sediment Management for Remaining Phase 1 and Phase 2 Sites