The agency announced it's working with the U.S. Bureau of Land Management in a coordinated review.
U.S. Bureau of Land Management (BLM)
"This is great news for Colorado and I’m thrilled the Department of the Interior listened to Coloradans," Sen. Cory Gardner Said.
In April it appeared the national monument would be among those reviewed by the Interior Department, at the direction of President Donald Trump.
The county's commissioners say that adding large industry, such as oil and gas, would put a strain on natural resources.
The Tres Rios Resource Management Plan also affects ranching and recreation.