The county has four "historic wildfire corridors," including the Hanly Fire area, Sonoma Valley (scene of the Cavedale fires in 1925 and 1966), the Geysers (with fires in 1988, 1999 and 2004 that covered a total of 22,000 acres) and the Guerneville area (hit by major fires in 1923 and 1961, the latter burning 5,800 acres, 18 homes and $500,000 worth of timber. In Santa Rosa, about one-fourth of the city's residents live within four moderate, high and very high severity fire zones, mostly hilly, wooded areas all east of Highway 101. Two of the zones bracket Annadel State Park: One of them east of Summerfield Road, the other along Highway 12 including parts of Oakmont. The largest zone covers a broad swath of northeast Santa Rosa, including all of Fountaingrove and the Chanate Road, Hidden Valley and Brush Creek areas down to Highway 12.