The Federal Emergency Management Agency (FEMA) defines High Hazard dams as “those [dams] where failure or mis-operation will probably cause loss of human life.” The current industry standard is to have Emergency Action Plans for all High Hazard dams, but California does not give the Division of Safety of Dams the authority to require dam owners to prepare one.
According to a report from FEMA’s National Dam Safety Program, only ten states do not give their dam safety agencies the authority to require Emergency Action Plans: Alabama, California, Georgia, Idaho, Indiana, Iowa, Kentucky, North Carolina, Vermont, and Wyoming. The map below, from the FEMA report, shows those states in gray.
The map also shows the percentage of high hazard dams that had Emergency Action Plans. In 2013, only 45% of High Hazard dams in California had Emergency Action Plans. California has some of the largest dams in the country, and major earthquake risks.
1 Percentage of State-regulated High Hazard dams with Emergency Action Plans Source: FEMA
Federal Emergency Management Agency, “Federal Guidelines for Dam Safety: Hazard Potential Classification System for Dams,” April 2004. Available at https://www.fema.gov/media-library-data/20130726-1516-20490-7951/fema-333.pdf
Federal Emergency Management Agency, “Dam Safety in the United States: A Progress Report on the National Dam Safety Program,” August 2014. Available at https://www.fema.gov/media-library-data/1467048771223-c5323440700a175565a2c0c9d604f9e3/DamSafetyUnitedStatesAug2014.pdf
U.S. Army Corps of Engineers, “National Inventory of Dams database.” Available at http://nid.usace.army.mil/cm_apex/f?p=838:4:0::NO