Brown's Canyon Bridge, later a trestle, is tallest west of Mississippi.
Railexpansion opens up Russian River area to Bay Area tourism.
Logging and shipping become major activities in the 19th century as mill products are sent south by schooners.
Jasper O'Farrell buys Jonive Rancho (Sebastopol.) He names his holdings the Annaly Rancho, eventually turned into Analy.
O'Farrell provides for the building of the first Catholic church, with Father Rossi in charge, andlays out a general merchandise store operated by Bodega's Mc Caughey brothers. Mariano Vallejo elected Sonoma district's first state senator (district includes Mendocino County until 1859.) Numerous squabbles over land, including cost of court battles, cause major economic losses for Vallejoover a number of years.
Serious conflict avoided as Sonoma supporters of squatters face off against Bodega group led by landowner Tyler Curtis in so-called "Bodega War." Curtis, married to the widow of Stephen Smith, moves to San Francisco. Italians come to Occidental, other areas, work in lumber mills,tanneries and quarries.
Jennie Colvin becomes first woman to register to vote in county; women vote in Santa Rosa city election in April; Atty.