Lyons Bridge Fishing Access Site is a major public access point on the Madison River located 31 miles south of Ennis, featuring a paved concrete boat ramp, vault toilets, and a large gravel parking lot accommodating 30+ vehicles with trailers.

This is the gateway between the Upper and Middle Madison sections and serves as both a launch and take-out point for float trips, though it experiences heavy use during peak season (arrive before 8 AM during salmonfly season in late June).

The site also provides wade fishing access to the Upper Madison and is suitable for both boating and wading recreation.