Proclamation 10746-Boundary Enlargement of the San Gabriel Mountains National Monument

Proclamation 10746 enlarges the boundaries of the San Gabriel Mountains National Monument in southern California. The original monument was established by President Obama in 2014 to protect the rich cultural history, geological features, and ecological diversity of portions of the Angeles National Forest near Los Angeles. This proclamation extends those protections to additional adjacent lands, bringing more of the San Gabriel Mountains under federal monument designation and the associated land use restrictions.

The proclamation affects communities surrounding the San Gabriel Mountains, outdoor recreation users, environmental advocates, local governments, and the Forest Service and Bureau of Land Management, which manage the affected lands. The Los Angeles metropolitan area in particular is affected, as the monument serves as a critical natural recreation and conservation area for millions of urban residents.

The legal basis for this proclamation is the Antiquities Act of 1906, which grants the President authority to designate and protect objects of historic or scientific interest on federal lands. Monument boundary expansions under the Antiquities Act are generally well-accepted legally, though the scope of the Act's application to large landscape-scale protections continues to be debated.

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