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 numerous ponds and the Walker River.

The area offers fishing opportunities on multiple waters (open February-September), waterfowl and upland game hunting on designated days, and camping at designated sites.

Vessel use is restricted February 15-August 15 except on specific ponds and the Walker River, with a 5 nautical mile per hour speed limit where allowed.