Peter's Cyn. Wash, near Walnut, Irvine, 7-1-12. © Ron Vanderhoff.

S. A. River, vic Gypsum Cyn. Rd., 8-28-14. © Ron Vanderhoff.

S. A. River, vic Gypsum Cyn. Rd., 8-28-14. © Ron Vanderhoff.

S. A. River, vic Gypsum Cyn. Rd., 8-28-14. © Ron Vanderhoff.

Peter's Cyn. Wash, near Walnut, Irvine, 7-1-12. © Ron Vanderhoff.

San Juan Creek, Ave. Aeropuerto to mouth, 6-30-13. © Ron Vanderhoff.