As a result of the serious flooding problems in 1986, the State Legislature passed the Delta Flood Protection Act of 1988 (SB 34). A portion of the Act provides for financial assistance for the communities of Walnut Grove and Thornton, and the eight islands of the west Delta shown on the map. These islands are critical to protecting Delta water quality because they are adjacent to major Delta channels in the area where fresh and salt waters mix. The Act also significantly increased monetary assistance to districts charged with the maintenance of local Delta levees via the Delta Levees maintenance Subvention Program. In 1991, Senate Bill 1065 went into effect to assure that these flood protection activities result in no net loss of fish or wildlife habitat and to provide $3 million to mitigate past impacts.