North suburbs plot I-25's future.(Denver's north suburbs; Interstate 25)

Mayors arm-wrestle over interchanges

Unable to choose a single favorite, the metro cities along northern Interstate 25 have agreed to eventually build three interchanges at 128th, 136th and 144th avenues.

Westminster, Thornton and Broomfield each favor a different location, based on the benefits they would derive or the political upheaval they would avoid.

Today, travelers to Denver's northern suburbs find a string of interchanges that ends at 120th Avenue. The next interchange is six miles to the north at Highway 7.

Thornton Mayor Margaret Carpenter said that while some observers may question whether three interchanges are needed, she said growth from Denver International Airport and E-470 would justify each …