Nature & Science
San Dimas Experimental Forest
Established in 1933, the San Dimas Experimental Forest is the only such forest in southern California. It covers 6,945 ha in the front range of the San Gabriel Mountains, located about 50 km northeast of Los Angeles. The San Dimas Experimental Forest is within the boundary of the Angeles National Forest - San Gabriel Mountains National Monument. Originally established as an outdoor hydrologic laboratory to document and quantify the water cycle in semi-arid steep lands, most of the facilities were constructed by the Depression-era Civilian Conservation Corps and Work Projects Administration labor programs. San Dimas has a long history as a research site in the fields of hydrology and ecology and is recognized as a Biosphere Reserve by UNESCO's Man and the Biosphere program. San Dimas also contains the Fern Canyon Research Natural Area.
Alerts & Warnings
- NEW! Office Updates - Need Info or Passes?
- UPDATED! Forest Service Road Closures
- Additional Damage to Roads/Trails Due to Tropical Storm Hilary
- Fire Danger: HIGH
- Temporary Closures (Bobcat Fire)
- Advisory: Safety by Waterfalls / Streams / Creeks
- Driving to the Forest?
- Advisory: Hiking at High Elevations
- Planning to Camp? (Stay Limits & Dispersed Camping Restrictions)