Mason Valley WMA Access provides entry to a 17,742-acre wildlife management area in Lyon County featuring diverse habitats from desert shrub to wet meadows with multiple fishable waters including North Pond, Bass Pond, Crappie Pond, and the Walker River (open for fishing February through September).

The area offers designated camping sites and vessel access on select ponds with flat-wake speed restrictions, though trespass is prohibited in the eastern pond area from mid-February through mid-August during nesting season.