The Danish sea captain Cornelius Jensen settled in Agua Mansa around 1854 where he ran a store , and he married Californio Mercedes Alvarado soon thereafter . After the Great Flood of 1862 , most of the town was destroyed with the exception of the cemetery , the chapel , and Jensen 's store . Some years later , Jensen bought a part of the Rubidoux ranch . Jensen and Alvarado bought land in Agua Mansa in 1865
Great Flood of 1862
Great Flood of 1862
Jensen Alvarado Ranch