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N.C. 150 Widening Improvements
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Continuous Flow Intersection

Project Fast Facts
  • Status: Projects Under Development
  • Counties: Catawba and Iredell
  • Project Type: Roadway Improvement (15 mile widening)
  • STIP Number: R-2307 and I-5717
  • Estimated Cost: $269.47 million
N.C. 150 Widening Improvements

Project Overview and Purpose

Planning and design is underway for a project that would improve traffic flow and reduce congestion on a 15-mile stretch of N.C. 150 – from the N.C. 16 Bypass in Catawba County to just west of the U.S. 21/N.C. 150 interchange in Mooresville, in Iredell County.

Proposed work would involve widening the mostly two-lane highway to multiple lanes as well as improvements to the I-77/N.C. 150 interchange in Mooresville.

Improvements to N.C. 150 would accommodate current and future traffic volumes and reduce congestion.

Project Highlights

Work to widen N.C. 150 – from the N.C. 16 Bypass in Catawba County to just west of the U.S. 21/N.C. 150 interchange in Iredell County – would be divided into two sections:

  • Section A, which involves only widening N.C. 150 in Catawba County
  • Section B, which involves widening N.C. 150 in Iredell County as well as improvements to both the intersection at Williamson and Bluefield roads and the I-77/N.C. 150 interchange – both in Mooresville

Following state and federal agencies reviewing the proposed project and evaluating its potential effects on the Terrell Historic District, the N.C. Department of Transportation project team selected a design option, referred to in the Environmental Assessment as Alternative 2, that would widen N.C. 150 in Catawba County and also incorporate a northern bypass around the historic district, which is protected under federal law. Another design option that was studied – Alternative 1 – would have widened N.C. 150, but would have had adverse effects on the historic district.

In addition to widening N.C. 150 in Iredell County, NCDOT also proposes building a "continuous flow intersection" in Mooresville, at the intersection of Williamson and Bluefield roads. In a continuous flow intersection, vehicles turning left cross opposing lanes of traffic at a signal-controlled crossover, before reaching the intersection.

I-77/N.C. 150 Interchange Improvements

Improvements to the I-77/N.C. 150 interchange in Mooresville would reconfigure the interchange by adding lanes to N.C. 150 and to the existing on- and off-ramps, as well as building overpass bridges.

Finding of No Significant Impact Approved

State and federal agencies determined in the Finding of No Significant Impact – the final environmental document approved in June 2017- that the project would not cause a significant adverse impact to the natural and human environments.

Project Funding

The N.C. 150 widening project is listed as Projects R-2307 and I-5717 in the State Transportation Improvement Program, the N.C. Department of Transportation's plan that identifies funding and scheduling for transportation projects over a 10-year period.

The project is currently funded for $269.47 million.

Project History

A traffic safety analysis by NCDOT's Safety Planning Group conducted in June 2011 found that crash rates on the 15-mile stretch of N.C. 150 exceed the statewide crash rates in the total non-fatal injury and wet-condition categories and exceed critical crash rates in the total and non-fatal injury categories.

A report on the traffic safety analysis concluded that a divided roadway with a raised median "should potentially reduce frontal impact crashes along the corridor." The median also acts as an area where drivers can slow and attempt to regain control of their vehicles, and is an important safety feature of a high-volume or high-speed roadway. The report also recommended that a driveway access review be conducted to determine if driveways can be closed or combined to reduce conflict points.

A traffic forecast completed in September 2013 found that:

  • N.C. 150 traffic volumes exceeded two-lane capacity between Sherrill's Ford Road and the I-77 Interchange commercial district
  • N.C. 150 traffic volumes west of Sherrill's Ford Road are projected to exceed capacity between 2015 and 2020
  • The projected length of N.C. 150 will exceed two-lane capacity by 2035

Public Involvement

NCDOT collected public feedback on the proposed project's Environmental Assessment and design options – referred to as build alternatives – during a public comment period that ended Sept. 23, 2016. In addition, there were two public meetings – one in Maiden on Aug. 22, 2016, and another in Mooresville on Aug. 23, 2016.

All comments – regardless of how they are submitted – carried equal weight and were taken into consideration, during the conclusion of the project development process.

The maps and materials that were available at the meeting are available for review on this page under the "Alternative 1 and 2 Maps" section in Project Documents.

Project Timeline

Milestone Dates*
Environmental Assessment approved March 2016
Public hearing August 2016
Finding of No Significant Impact issued Late spring 2017
Right of way acquisition for N.C. 150 in Iredell County August/September 2017
Construction contracts awarded for N.C. 150 in Iredell County August 2019
Right of acquisition begins for N.C. 150 in Catawba County 2023
Construction begins for N.C. 150 in Catawba County 2025

* Future dates are preliminary and subject to change

Project Documents

Alternatives 1 and 2 Maps*

*Alternatives 1 and 2 are identical except in Map 3, which runs through the Terrell Historic District.

Contact Information

Karen S. Reynolds
Project Planning Engineer
(919) 707-6038
Send a message
1548 Mail Service Center
Raleigh, NC 27699-1548

Bryan C. Key, P.E.
Roadway Design Engineer
(919) 707-6263
Send a message
1582 Mail Service Center
Raleigh, NC 27699-1582

Larry Carpenter Jr., P.E.
Division Construction Engineer
Highway Division 12
(704) 480-9020
Send a message
P.O. Box 47
Shelby, NC 28151-0047

Resources for Local Property Owners

Although the N.C. Department of Transportation works to minimize the number of homes and businesses displaced by a road project, it is inevitable, in many cases, that a certain amount of private property is needed. The following information explains right of way acquisition and answers questions about the process.