Some Westerners have long argued federal land managers should be closer to the land they oversee.
The long-awaited change drew praise from Denver-based Western Energy Alliance, which sued to block the rules.
The Native American Rights Fund represents three of the five American Indian tribes suing President Trump over his proclamation to shrink the national monument.
In 2014, Bundy and his sons led an armed standoff against federal agents who came to enforce the law in Bunkerville, Nevada.
CU Boulder environmental historian Paul Sutter digs into the details of the Antiquities Act.
Journalist Jon Billman has covered all kinds of missing-in-the-wilderness stories, including Tennessee college student Joseph Lloyd Keller who vanished in Colorado in 2015.
Zinke said unspecified boundary adjustments for some monuments will be included in the recommendations he planned to give President Donald Trump.
"This is great news for Colorado and I’m thrilled the Department of the Interior listened to Coloradans," Sen. Cory Gardner Said.
The attraction expects to see 3-4 million visitors to the park this year. On a busy day, it can take about two hours to drive from one side of the park to another.
Colorado’s Recreation Industry Office, Denver Mayor Michael Hancock, Gov. John Hickenlooper and others plan to make a “major announcement” Thursday.