The Santa Ana River, running through three of the largest counties in America, has a long, often overlooked history from Native American settlement to the contemporary industrial corridor, but always riparian and beautiful. This essay and accompanying photographs explore the middle section of the river, which runs through San Bernardino and Riverside Counties, the Native American settlement of Agua Mansa, the exploration of de Anza, and the current landscape of homeless residents in an emerging post-industrial landscape.