From the plaque:
was to provide supplies for Francisco Coronado's expedition
in search of the fabled Seven Cities of Cibola. The Spaniards
led by Hernando de Alarcón ascended the Colorado
River by boat from the Gulf of California past this point,
thereby becoming the first non-Indians to sight Alta California
on September 5, 1540.
Plaque placed by the State Department of Parks and Recreation in cooperation with the Quechan Tribal Council, The Imperial Irrigation District, Imperial Valley Pioneers, and Squibob Chapter of E Clampus Vitus, October 10, 1982.