Flooding continued to be a problem for the Yuma Project. In January 1916, a flood larger than the one in 1912 caused in breaks on the Reservation Levee as the Gila River reached a maximum flow of . The river again flooded a few days later, reaching a flow of . Afterward, 10,000 of the Reservation Division was inundated while 3,000 of the Valley Division's flooded. The floods also displaced 50,000 yards of main canal. The Bureau of Reclamation worked quickly to restore the project in 15 days. In 1918, the Colorado River's meandering damaged part of the Reservation levee and it was repaired slowly with unskilled labor because of World War I's troop demands. The Laguna Diversion Dam weathered the floods but its downstream talus at its toe was extended between 1923 and 1924 to help better protect it. An earthquake on May 18, 1940 damaged the Project considerably, especially the Valley Division. Canals, levees and other features were damaged but repaired by late May. From 1936 through World War II, Civilian Conservation Corps workers, Indians from Mexico, Italian prisoners and German prisoners all worked to maintain the project.