San Gabriel Mountains National Monument

The San Gabriel Mountains National Monument is a National Monument managed by the U.S. Forest Service, which encompasses parts of the Angeles National Forest and the San Bernardino National Forest in .

On October 10, 2014, Barack Obama used his authority under the Antiquities Act to create the new monument, protecting 346,177 acres of public lands in the San Gabriel Mountains of the Transverse Ranges. The effort to protect the San Gabriel Mountains began more than a century earlier, in 1891 with another U.S. , Benjamin Harrison, the 23rd , using a congressional act, to designate and delineate the first federal protection in the of forested lands, using the same mountain range name, as the San Gabriel Timberland Reserve.

Two earlier conservationists, Abbot Kinney and John Muir, influenced Benjamin Harrison.