Winters Putah Creek Nature Channel Restoration

Winters Putah Creek Nature Channel Restoration

The California Department of Fish and Game is executing Lake or Streambed Alteration Agreement number 1600-2009-0088-R2, pursuant to Section 1602 of the Fish and Game Code to the project applicant, Solano County Water Agency. This project will remove a percolation dam and use processed waste concrete to help fill margins of the channel in the pool immediately below the percolation dam. The south bank abutment and first segment of the dam on the south side may optionally remain if the budget does not allow for complete removal. The dam will be removed completed or to a depth of 15 feet below summer water surface elevation. Access will occur from an existing ramp on the south bank off of Putah Creek Road that leads to a three-acre staging area formerly used for water treatment aeration ponds (Putah Creek Flats). The former pond sites will be cleared and excavated to create fill to restore 210 linear feet of floodplain on the south bank of sufficient width to access the percolation dam as needed for heavy equipment and to provide continuity of the south bank floodplain from the Winters Car Bridge to Putah Creek Flats. The staging area will be used to store imported fill for subsequent channel realignment projects throughout Winters Putah Creek Park. The derelict percolation dam foundation will be demolished, processed to remove exposed rebar and the waste concrete will be placed along the toe of the banks in the pool below the percolation dam and capped with a minimum of three feet of clean fill. Gabion baskets may be used at the option of the contractor to place the waste concrete in the channel and would also be capped with a minimum of three feet of clean fill. Subsequent phases of the project will fill in the existing pool below the percolation dam and create a design channel through the future constructed floodplains. The project area consists of 1200 linear feet of channel below the current location of the percolation dam and 100 feet above the percolation dam, inclusive of the dam. The area of the dam is 150 long and 30 feet wide (4500 sf - 0.1 acre). The area of constructed floodplain along the south bank is 210 feet x approximately 20 feet depending on the volume of waste concrete incorporated into the base of the constructed floodplain - 4200 sf - 0.1 acre. The staging area on Putah Creek Flats including the access ramp is 3 acres. Total project area is 3.2 acres.

Winters

Solano, Yolo