The North Fork San Jacinto River is a free-flowing, high-elevation stream that originates on San Jacinto Peak within the Mount San Jacinto State Game Preserve and Wilderness Area. It flows for 11.4 miles from its headwaters to a diversion on private land, characterized by a steep, rugged watershed that drops from over 10,000 feet at the upper ridge to 3,100 feet where it exits the national forest. The river corridor features diverse scenery, from montane meadows and subalpine forests at high elevations to oak woodlands and chaparral lower down, with a riparian zone of white alder, cottonwood, and willow. It is designated as a Wild and Scenic River from its source at Deer Springs to a specific northern boundary. Flows can become intermittent during mid to late summer and fall. The area provides habitat for several at-risk species and offers a primitive, scenic fishing experience accessed via forest service roads.