The Park can only be reached by boat. There are no public roads to it and private motor vehicles are prohibited within.

Visitors can launch into Big Lake at a PG&E public boat launch known as "Rat Farm".

It is reached from McArthur by turning north off Highway 299 on to Main St., continuing past the Intermountain Fairgrounds, crossing over a canal and proceeding 3-miles north on a graded dirt road.