Big Tujunga Wash at the east end of Hansen Dam basin, seen here in April 2017 after a wet winter. In the distance, beyond the I-210 freeway, are the foothills of the San Gabriel Mountains. The barren, rocky wash floor on the photo's right side transitions westward to riparian woodland — willow trees, cottonwood, white alder — where ground water from the mountains is forced to the surface at the west end of Verdugo Hills.

Photo by Bill Neill