The Au Sable River in Michigan is a premier destination for fly fishing enthusiasts, renowned for its clear waters, diverse fish species, and picturesque surroundings. Spanning approximately 138 miles from its source in Frederic Township to its mouth at Lake Huron, the river offers year-round fishing opportunities. Its designation as a "Blue Ribbon Trout Stream" underscores its exceptional quality and the abundance of trout populations.
The Au Sable River comprises several distinct sections, each offering unique fishing experiences. The Main Branch flows from Grayling to Lake Huron, with notable stretches like the "Holy Water," a nine-mile catch-and-release, fly-fishing-only area. The North Branch and South Branch are renowned for their serene environments and abundant trout populations. Additionally, the lower river sections below Mio Dam are famous for steelhead and salmon runs.
The Au Sable River is home to a variety of fish species, making it a versatile fishing destination. Anglers can target brown trout, brook trout, and rainbow trout throughout the river. In the lower sections, particularly below Foote Dam, steelhead and salmon are prevalent during their respective runs. Smallmouth bass are also found in certain stretches, especially during the warmer months.
Understanding the behavior and diet of the river's fish is crucial for successful angling. Trout in the Au Sable River feed on a variety of aquatic insects, including mayflies, caddisflies, and stoneflies. Seasonal hatches, such as the Hexagenia limbata (Hex) hatch in late June and early July, provide excellent dry fly fishing opportunities. Steelhead and salmon are more aggressive during their spawning runs, often responding well to egg patterns and streamers.
Fly fishing techniques on the Au Sable River vary by season and target species. Dry fly fishing is particularly effective during insect hatches, while nymphing and streamer fishing can yield results year-round. Swinging streamers is a popular method for targeting steelhead and salmon in the lower river sections. Anglers should adapt their approaches based on current conditions and fish behavior.
Several locations along the Au Sable River are favored by anglers. The "Holy Water" stretch near Grayling is renowned for its abundant trout and fly-fishing-only regulations. The South Branch's Mason Tract offers a secluded fishing experience amidst pristine wilderness. Below Mio Dam, the river widens and deepens, providing habitat for larger trout and seasonal runs of steelhead and salmon.
The Au Sable River boasts numerous access points for anglers. In the upper sections, sites like Burton's Landing and Wakeley Bridge provide convenient entry. The South Branch can be accessed via Chase Bridge and Smith Bridge. For the lower river, McKinley Bridge and Foote Dam are popular access points, especially during steelhead and salmon seasons.
A 9-foot, 5-weight fly rod is versatile for most fishing scenarios on the Au Sable River. Floating lines are suitable for dry fly fishing, while sink-tip lines can be beneficial for streamer fishing. Waders with good traction are essential, especially in sections with deeper pools and stronger currents. A selection of flies matching the river's prevalent hatches will enhance success.
Conservation efforts are vital to maintaining the health of the Au Sable River ecosystem. Anglers are encouraged to practice catch-and-release, especially in designated areas. Being mindful of aquatic habitats, such as avoiding wading through spawning beds, helps preserve fish populations. Participation in local conservation initiatives further supports the river's sustainability.
Safety is paramount when fishing the Au Sable River. Always check weather conditions before heading out, as water levels can fluctuate. Wear appropriate gear, including waders with non-slip soles, and consider using a wading staff in deeper sections. Be aware of local wildlife and take precautions to avoid encounters. Inform someone of your fishing plans and expected return time.
Local fly shops are invaluable resources for anglers on the Au Sable River. They offer up-to-date fishing reports, gear, and expert advice. Notable shops include Gates Au Sable Lodge in Grayling and Old Au Sable Fly Shop, both of which provide guided trips and a wide selection of flies tailored to the river's hatches.
Several organizations are dedicated to the conservation of the Au Sable River. The Anglers of the Au Sable is a prominent group focused on preserving the river's health and promoting sustainable fishing practices. Engaging with such organizations can provide opportunities for education, advocacy, and participation in conservation projects.