Yuma Crossing
Immediately after the Mexican–American War in 1848, the U.S. Army built Fort Yuma here to protect travelers from Indians raiding the area. It was the center point of conflict in the Yuma War of 1850–53. From 1864–1890, the fort and nearby facilities was the main army base to support the US Army's efforts to control the Indians throughout the greater southwest.
Steamboats of the Colorado River
The beginnings of the use of steamboats on the Colorado River came as the result of the founding of Fort Yuma during the Yuma War. Supplies had to be shipped over long distance from San Francisco to San Diego then overland through the Peninsular Ranges via Warner Pass to Depot Vallecito then 113 miles across the arid Colorado Desert to the fort. Costs of such transport was minimally $500 per ton. Supplying the fort became so difficult, that for a time it had to be abandoned.