Mason Valley WMA Access provides entry to a 17,742-acre wildlife management area featuring the Walker River floodplain, wet meadows, and ponds suitable for fishing and wildlife viewing.

Multiple access points are available via Miller Lane and Sierra Way from Highway 95A near Yerington, with designated parking areas and a nature trail with footbridge.

Fishing is open year-round on select waters including Hinkson Slough, North Pond, Bass Pond, and the Walker River, with vessel use permitted at speeds leaving a flat wake (max 5 mph) except during breeding season closures (Feb 15-Aug 15).