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 from mid-February through September.

The area offers designated camping and boat launch facilities, though vessel use is restricted from mid-February through mid-August on most waters except Hinkson Slough, Bass, Crappie, and North Ponds.

Hunting regulations apply seasonally, with waterfowl hunting permitted only on specific days during the waterfowl season.