July 1963, station WWVB was moved to a site just north of Fort Collins, Colorado. August 1963, station WWVL moved from Sunset to the site near Fort Collins. December 1966, station WWV ceased operation at its Maryland site and began broadcasting from the site near Fort Collins. The station had been severely damaged by a hurricane in 1970. July 1972, broadcasts from station WWVL were discontinued.
Broadcasts continue today from Colorado and Kauai.
The low frequency broadcasts of WWVB at 60 kHz involve only a digital time code, but the carrier frequency is referenced to the NIST frequency standard.