Construction started in March 2019 (STIP project I-5507) adds a tolled Express Lane in each direction of Interstate 485 between the systems interchange with I-77 and the Monroe Expressway (Toll U.S. 74). The State Transportation Improvement Program funded the $346 million project in 2015. The lanes will be implemented by the N.C. Turnpike Authority and include a new interchange at Weddington Road in Matthews and improvements to the exchange with John Street (Exit 52). Work runs through 2022.
As of March 2002, two sections of Interstate 485 were open to traffic: Three miles of the northeastern section connecting I-85 with NC 49, and the southern section linking N.C. 160 west of I-77 with N.C. 51 east of Charlotte. Interstate 485 was extended northeast to Lawyers Road, north of U.S. 74, by August 2002. Construction continued to NC 218. (Thanks to Ayan Kayal for providing the construction update.)
An additional 7.5 miles of the Charlotte Outer Loop, between Albemarle Road (NC 24-27) and NC 49, were completed on September 3, 2003. A series of weather related delays pushed back the planned opening of this segment initially from July 1 to mid August 2003.3 Joining I-85 with University City, the six lane freeway took 2.5 years to complete and cost $55.4 million.4 Interchanges along this section were built at Rocky River and Harrisburg Roads.
Interstate 485 was slated to open five miles from NC 49 to Lawyers Road at Mint Hill by mid-October 2003. However engineering difficulties encountered with bridge design4 as well with problems associated with plans for sewer pipes hampered work on the segment.5 Delays caused by heavy rains during the Winter and Spring of 2003 pushed the planned opening beyond the scheduled date of July 1. The Mint Hill segment of I-485 ultimately opened to traffic on November 19, 2003. This ribbon cutting increased the total mileage of Interstate 485 to 39 miles, or about 60 percent complete.2
The aforementioned weather delays also pushed back the construction schedule on the southwestern leg of the Charlotte Outer Loop. This 7.4 mile long section extended I-485 to Wilkinson Boulevard and Interstate 85.2 Anticipated to open in December 2003 and then March 2004, the Beltway between I-77 and I-85 finally did October 19, 2004.6 Interchanges along the stretch were built at Arrowood Road, NC 160 (Steele Creek Road), Wilkinson Boulevard and I-85. The $100 million, six lane project also provided an alternate route to Wilkinson Boulevard for Billy Graham Parkway (former U.S. 521) into Charlotte Douglas International Airport (CLT).5 With 47 miles finished at this time, Interstate 485 was 70% complete.3
Construction of the cloverstack joining I-85 and I-485 in western Charlotte. The exchange opened on October 19, 2004, when the beltway debuted to motorists southward to Arrowood Road (Exit 3) and Interstate 77. 10/05/01
As of November 2004 every portion of the overall 67 mile loop was open or under construction with the exception of the six mile segment from NC 115 (Old Statesville Road) to Interstate 85 in northeast Charlotte. The unexpected growth that coincided with the construction of Interstate 485 swelled traffic counts to 112,000 vehicles per day (vpd) across areas of south Mecklenburg County. This resulted in expanding the design of the succeeding freeway segments with additional lanes and better interchanges to augment problems with development and increasing traffic expectations.1 Furthermore, a $14.7 million contract was awarded in 2004 to add an additional lane in each direction between Interstate 77 and Arrowood Road.5 That expansion project was completed in 2006.
The next beltway section, from Interstate 85 north to NC 27 (Mount Holly Road), was scheduled to open in July 2005. A series of delays over an 18 month period extended construction until December 15, 2006.7,8 This portion of I-485 includes the roundabout interchange at Moore’s Chapel Road, the only of its kind on the Charlotte Outer Loop.
The extension of Interstate 485 from NC 27 (Mount Holly Road) north to NC 16 (Brookshire Boulevard) opened to traffic on May 8, 2007.9 Work simultaneously was underway along the northernmost reaches of Interstate 485 near I-77 at Huntersville. Started in December 2003, construction and weather delays pushed completion back two years3 to December 5, 2008. Costing $94 million, this portion of I-485 lengthened the beltway east to I-77 and NC 115 at Exit 23C.2 Pending Federal Highway Administration (FHWA) concurrence, AASHTO conditionally approved 11.95 miles of Interstate 485 clockwise from I-85 clockwise to I-77 on May 15, 2009.
The final segment of Interstate 485 built was the northeastern quadrant. Officials sought to accelerate work on the last 5.7 miles of I-485, from NC 115 east to I-85. If stimulus finds were secured in 2009, work was anticipated to start that year and end in 2012. The $231.7 million segment encountered several delays, pushing back scheduled opening of the freeway from December 2014 to Spring 2015.10 It was then announced on May 13, 2015 that a ribbon cutting ceremony would take place on June 5, 2015 around noon,11 officially completing Interstate 485.
Proposed interchanges at Oakdale Road in the northwest quadrant and NC 51 in the southeast quadrant at Mint Hill were not included in original construction of Interstate 485. This was because those areas were undeveloped, reducing the need for interchanges at that time.5 The postponement of work at NC 51 was requested by the town of Mint Hill. Several residents however petitioned the local government to rescind that request and have the interchange constructed. Mint Hill Mayor Ted Biggers was opposed to this, citing that the highway was only two lanes with traffic counts of just 8,200 vehicles per day (vpd). Biggers felt that the opening of I-485 would alleviate pressure from NC 51, as motorists used the route to access nearby Albemarle Road.12 The diamond interchange with NC 51 eventually opened by 2005.
The exchange at Oakdale Road was graded but remained unopened until July 2015, when NCDOT awarded a $4.8 million contract to finish the dumbbell interchange. Work followed a 1999 study that recommended completing the ramps once development spread to 75 percent of the land within a half mile radius of the crossroads with I-485. Construction wrapped up on the new exit in November 2016.13