Robinson Creek originates in the high Sierra Nevada of Mono County, California, flowing from the alpine wilderness near Matterhorn Peak and flowing northeast through the Bridgeport Valley before joining the East Walker River. This cold, clear mountain stream drops approximately 1,200 feet over its roughly 12-mile course, creating a dynamic waterway that transitions from tight mountain canyon to pastoral meadow.

The creek begins its journey in the rugged backcountry above Twin Lakes, fed by snowmelt from peaks exceeding 12,000 feet. From Upper Twin Lakes, Robinson Creek flows through a narrow, forested canyon characterized by towering white pines, Jeffrey pines, and lodgepole pines, with carved sandstone banks creating an almost otherworldly corridor. The stream maintains consistent Class I rapids and riffles through this upper section, with numerous small drops and technical maneuvering required around frequent bends and occasional log jams.

Below Twin Lakes, the creek's character shifts as it enters a high mountain meadow environment near the Robinson Creek Campground area, approximately 7,000 feet elevation. Here the flow moderates somewhat before encountering more substantial drops, including a notable 4-foot ledge at the remnants of an old grist mill near Kelly Road bridge. The lower sections feature Class II-III rapids with ledges reaching 4-5 feet, including the well-known "Polly Falls," before the creek joins the East Walker River south of Bridgeport.

Robinson Creek supports healthy populations of rainbow trout and brown trout, with the California Department of Fish and Wildlife conducting regular surveys. The riparian corridor provides habitat for black bear, mule deer, river otter, and mink, while bald eagles and golden eagles frequent the area. The creek flows through the Robinson Creek Pines State Natural Area in its upper reaches, protecting significant old-growth forest.

Access is excellent via Twin Lakes Road west of Bridgeport, with multiple campgrounds including Robinson Creek North and South providing put-in and take-out options. The town of Bridgeport, nine miles from the upper campgrounds, serves as the primary supply point.

The creek is typically runnable from late spring through fall, with peak flows during snowmelt in May and June. Water levels significantly affect difficulty, and the narrow stream requires precise boat control. Local paddlers and the Friends of the Black River maintain access by clearing log jams annually.

The creek was named for Moses Robinson, who operated a lumber mill along its banks in the 1860s, with stone foundations still visible near the Kelly Road crossing. Cold water temperatures persist year-round, demanding appropriate safety gear. California fishing regulations apply, and the creek's remote sections require self-sufficiency and wilderness navigation skills.