Northwest Parkway

Northwest Parkway is a 9.05 mi limited-access toll road that runs from US 36 to the I-25/E-470 interchange. Both termini are in Broomfield, northwest of Denver. In combination with E-470 (47 mi) and State Highway 470 (SH 470; 27 mi), Northwest Parkway forms a partial beltway of approximately 83 mi around the Denver metropolitan area. Some 18 mi lie between the west end of Northwest Parkway and the northwest end of SH 470, the opposite end of the beltway.

Northwest Parkway was funded entirely with private money and charges a $5.20 toll. Tolls may be paid using highway-speed electronic tolling.

Route description
Northwest Parkway begins as a continuation of E-470 westward. Following a stack interchange with I-25, the parkway crosses Huron Street in suburban Broomfield, surrounded by fields. After intersecting Sheridan Parkway, the route passes a small pond, followed by an underpass with Lowell Boulevard. Near Dillon Road, the parkway interchanges with US 287 in Lafayette before reentering Broomfield near the end of the toll portion at 96th Street. The parkway continues untolled for 1 mi before terminating at an interchange with US 36.

Tolls
Tolls on Northwest Parkway are charged based on a barrier toll system. It costs two-axle vehicles $5.20 for the barrier on the mainline gantry and $1.70 for the ramp gantries. ExpressToll and Go-Pass users do not pay processing fees, late fees, or any other fees in addition to the toll amount.

History
Northwest Parkway opened to the public in November 2003. In November 2005, a new intersection opened at Sheridan Boulevard in northern Broomfield. In August 2001, the cities of Westminster and Arvada put into motion the completion of an extension of Northwest Parkway, sometimes termed W-470, to connect to SH 470, I-70, and US 6 in Golden. The city of Golden struck down the proposal, but, in a compromise with the Colorado Department of Transportation (CDOT), an environmental impact statement (EIS) was done. Most likely, Indiana Street and SH 93 would be used to complete the beltway.

Lease to foreign consortium
In 2007, the board of directors of Northwest Parkway agreed to lease the operations of the highway to a consortium for 99 years. The two companies of the consortium are Brisa – Auto-estradas de Portugal and CCR S.A. According to the Boulder Daily Camera, this was the fourth time in two years that operations of an existing toll road in the US had been turned over to a private company under a long-term lease.

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.