US had been turned over to a private company under a long-term lease. The Northwest Parkway had been consistently generating less income than envisioned when it was funded by three local governments—Broomfield, Lafayette, and Weld County. The parkway was built with $416.4 million (equivalent to $ in ) in bonds, to be paid back with toll revenue over 35 years. Due to the road's underuse, the bond debt was downgraded in 2006. Use in 2007 was 12,000 cars per day, well below the 18,500 expected by 2004, one year after opening. Exit list See also State Highway 470 E-470 References External links Denver's 470 Saga Northwest Parkway official web site EXpressToll official web site Toll roads in Colorado Transportation in Boulder County, Colorado Transportation in Broomfield, Colorado Denver metropolitan area Interstate 70 Freeways in the United States