 Ramba uchiverenga ndima ino - Kutanga muna 1850 panguva yeCalifornia Gold Rush, guta reSacramento rakakurumidza kukura rakakomberedza kuungana kweRwizi rweSacramento nerwizi rwayo rweAmerican, pedyo nepakati peCentral Valley yeCalifornia. Kuwanda kwevanhu muguta racho kwakaita kuti zvive zvakafanira kuvaka madziva makuru pamitsinje yacho miviri kuti isazadza. Aya mabasa okutanga okudzivirira mafashamo akanga asina kukwana; muna 1862, guta racho rakafukidzwa nemvura zvakakwanakuti hurumende yenyika yakanga yaendeswa kuSan Francisco kwenguva pfupi. Muna 1955, U.S. Army Corps of Engineers yakavaka Folsom Dam pamharadzano yeNorth neSouth Forks yeAmerican River kuti ipe kudzora mafashamo enharaunda yeSacramento. Zvisinei, Dam reFolsom, rine simba re1 miriyoni acre tsoka 1.2 km3 richienzaniswa nokuyerera kwegore negore kweRwizi rweAmerica rwe2.7 miriyoni acre tsoka 3.3 km3, rwakabvumikisa kuva rusina kukwana. Mafashamo muna 1955 akazadza Folsom Reservoir kusvika pamwero wayo, dhamu risati rambopedzwa; rakazadzawo kakawanda kubvira ipapo. Zvisinei, kuwedzerwa kwokushandiswa kwemvura uye kutsauswa kwayo, zvinodikanwa zvokudzora mafashamo kwamakore 200, uye kushanda kwegadziriro kwakabatana kwakawedzera kukwanisa mafashamo emwaka muFolsom Lake. 