The Mad River in northern California is a renowned fishing destination flowing approximately 100 miles from its origin at Ruth Lake through Humboldt County before emptying into the Pacific Ocean near Arcata. Known primarily for its excellent winter steelhead runs and fall Chinook salmon fishing, the river offers diverse angling opportunities throughout its course. The Mad River Fish Hatchery, located near Blue Lake, plays a crucial role in maintaining healthy fish populations, particularly steelhead, with annual spawning numbers exceeding 10,000 fish. With varied sections from the estuary to the upper reaches, the Mad River provides different fishing experiences depending on the season, water conditions, and target species.