The federal Bureau of Land Management has approved construction of three corrals to hold more than 8,000 wild horses captured on federal rangeland.
The pens are the next step in plans announced last year by the administration of President Donald Trump to speed up the capture of 130,000 wild horses over 10 years at an estimated cost of $1 billion.
The new corrals are aimed at accelerating wild horse roundups that have been slowed down for lack of space in existing pens.
The bureau issued final decisions on environmental assessments for corrals in Colorado, Wyoming and Utah that are opposed by wild horse advocates.