The South Branch of the Au Sable River in Michigan, is one of the finest trout streams in the country. Mired in rich fly fishing lore and history, anglers are taken back in time, following this meandering river through a pristine wilderness as it flows from its headwaters towards the mainstream of the Au Sable.
From Chase Bridge in Roscommon to above Smith Bridge there is a special place in the annals of fly fishing. The Mason Tract. A section of undeveloped land that was conveyed to the State of Michigan in 1955 by the late George W. Mason in a perpetual trust to insure it remains undeveloped. It includes 1500 acres bordering the stream and an additional 1330 acres acquired from the U.S. Forest Service in 1957 that extended it's borders. This special tract is also known as the Mason Retreat.