Ahjumawi Lava Springs SP - Northern California National Or State Park

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.