weir, was merely 43 ft. tall, almost two-thirds of which were built below the riverbed. Subsequently, the dam only raised the river ten feet. Modifications to the dam's downstream talus were done between 1923–1924. After the creation of the Imperial Dam 5-miles upstream, the Laguna Diversion Dam was no longer needed and its California diversion outlets were closed on June 23, 1948. Since then, the dam serves to regulate the outflows of the Imperial Dam and often does not impound a large reservoir. Swastika design The Laguna Dam was decorated with numerous swastikas, thus developing the eventual nickname "Swastika Dam." The swastikas present on this structure were not put there for any sort of National Socialist ("Nazi"), or otherwise racist or socio-political reasons. They were placed there prior to Adolf Hitler's effectively having altered the popular meaning of the swastika within Western societies. Fish species Largemouth Bass Striped Bass Crappie Bullhead catfish Catfish (Channel) Catfish (Flathead) Tilapia Redear Sunfish Green Sunfish Bluegill Sunfish Mullet Carp Bullfrogs See also Mittry Lake – Created by the dam. County Route S24 References Map of Laguna Diversion Dam External links USBR Laguna Diversion Dam Website Swastika Dam article by Walter Smoter Frank USBR History of Laguna Dam Arizona Lake Levels Dams in California Dams in Arizona Dams of the Lower Colorado River Valley Dams on the Colorado River Buildings and structures in Imperial County, California Winterhaven, California Buildings and structures in Yuma County, Arizona United States Bureau of Reclamation dams Dams completed in 1905 Historic American Engineering Record in Arizona 1905 establishments in Arizona Territory 1905 establishments in California