Named after the county in Colorado, the ship was constructed by National Steel and Shipbuilding Company of San Diego, California.

This made the Newport class the first to depart from the standard LST design that had been developed in early World War II.

The LST carried 1,750 long tons (1,780 t) of diesel fuel for a range of 2,500 nautical miles (4,600 km; 2,900 mi) at the cruising speed of 14 knots (26 km/h; 16 mph).

The ship was also equipped with a bow thruster to allow for better maneuvering near causeways and to hold position while offshore during the unloading of amphibious vehicles.

[3][5] The Newport class were larger and faster than previous LSTs and were able to transport tanks, heavy vehicles and engineer groups and supplies that were too large for helicopters or smaller landing craft to carry.

[1][2] The Newport class has the capacity for 500 long tons (510 t) of vehicles, 19,000 sq ft (1,800 m2) of cargo area and could carry up to 431 troops.

[1][7] The vessels also have davits for four vehicle and personnel landing craft (LCVPs) and could carry four pontoon causeway sections along the sides of the hull.

The LST was commissioned on 4 June 1971 at Long Beach, California and assigned to the Amphibious Force, Atlantic Fleet, with the home port of Little Creek, Virginia.

[10] On 13 September 1988, Boulder ran aground on a shoal northeast of Frøya in a Norwegian fjord during the NATO military exercise Teamwork '88.