Proclamation 10745-Boundary Enlargement of the Berryessa Snow Mountain National Monument

Proclamation 10745 enlarges the boundaries of the Berryessa Snow Mountain National Monument in northern California. The original monument was established by President Obama in 2015 to protect the diverse historic, cultural, geological, and ecological resources of the Inner Coast Range. This proclamation adds additional adjacent lands to the monument's protected area, extending federal conservation protections to those areas and restricting certain extractive uses within the newly included boundaries.

The proclamation affects landowners, ranchers, recreational users, environmental groups, and local communities in the Berryessa Snow Mountain region of California. Federal agencies — particularly the Bureau of Land Management — are directly affected as they must manage the enlarged monument. Conservation organizations generally welcome such expansions, while some local interests may object to restrictions on land use.

Presidential proclamations enlarging national monuments draw on the Antiquities Act of 1906, which authorizes the President to protect objects of historic or scientific interest on federal lands. The scope of this authority has been debated, particularly regarding how large a monument can be and whether a president can reduce a monument established by a predecessor. Courts have generally upheld monument expansions while leaving the question of reductions more open.

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