Welcome to the James San Jacinto Mountains

About Us


What we do

One of the primary missions of the Natural Reserve System is to provide relatively undisturbed natural laboratories where scientists can conduct research on the workings of nature (or natural processes).

James Reserve

James Field Station

The Reserve is closed to the public and the entrance gate remains locked at all times. The lock combination is provided to users upon approval of their reservation for use of the Reserve.

Oasis de Los Osos

The Oasis de los Osos is a sister site of the James San Jacinto Mountains Natural Reserve administered by the University of California Riverside. Los Osos is located in Riverside County about 16 km (10 miles) north of Palm Springs near the mouth of Snow Creek Canyon. Los Osos became part of the Natural Reserve System in 1987 when The Nature Conservancy deeded the land to the University of California.

Trailfinders history

Harry and Grace James are celebrated here because fifty years ago they saw to it that their precious land and home would become a permanent place for environmental education and scientific research. Harry Claybourne James was a young man when he traveled from his birthplace in Ottawa, Canada to Los Angeles in 1919. He was particularly fascinated by the people who were starting the fledgling movie industry. Harry never made it to college, but was a prolific reader and writer, and was soon working as an assistant Director for Bob Leonard and Mae Murray’s silent movie studio, while spending much of his spare time hiking through the Hollywood Hills.


James reserve is interesting areas that are homes to a rich diversity of species that have been extensively studied. Explore the amphibian, birds, mammals, and reptiles species.