P-12-200-4260 NA Klamath Project, California-Oregon. The dam diverts excess water to the Klamath River through the Lost River Diversion Channel and thereby controls downstream flow in Lost River to prevent expansion of Tule Lake. It is a horseshoe shaped multiple arch concrete structure with earth embankment wings measuring 26 feet high with a crest length of 675 feet; June 23, 1978; Bureau of Reclamation photo by J. C. Dahilig