DNT Extension Phase 4

​Description

The future Dallas North Tollway (DNT) Phase 4 project will extend the tollway 13.7 miles north of US 380. When this extension is complete, it will provide a direct link between downtown Dallas and growing areas in Collin, Denton and Grayson counties. The project is currently in the planning and design phase.

The NTTA Board of Directors chose an alignment for the Phase 4 extension that straddles the Collin-Denton county line from FM 428 in Collin County to the Grayson County line. The county alignment provides a greater economic development benefit for most of the region, requires less right of way and follows an existing county road system.

Initially, there was an additional section identified as part of this extension. It was referred to as Phase 5A and would have extended the DNT from the Grayson County line to FM 121 in Grayson County.

Per state law, the Grayson County Regional Mobility Authority has primacy on any toll project within Grayson County, including portions of the DNT which may extend into Grayson County.

As part of the DNT Extension Phase 4 Project, the NTTA is proposing improvements to the Dallas North Tollway (DNT) by constructing an overpass at U.S. Highway 380 between Rockhill Parkway in the City of Frisco and West First Street in the Town of Prosper, Collin County, Texas. NTTA issued a Notice Affording Opportunity for Public Hearing (NAOPH) for the proposed project on July 23, 2019. Written requests were due by Friday, Aug. 23, 2019. No requests for a public hearing were received by the deadline.

 
To view the notice, click here.
To view notice in Spanish.
To view the project location map, click here.

Status

  • Planning and environmental study completed.
  • Design and engineering work on the DNT extension over US 380 is complete.
  • Construction of the DNT main lane extension over US 380 is now underway.
  • Environmental engineering work on the DNT 4A project continues.
  • Design of southbound frontage road for Phase 4B is currently underway.
  • Coordination with stakeholders and partners continues.

Estimated Cost
        $65,839,752.00 for DNT Extension over US 380 only.

Construction Date
       Construction of the DNT main lane extension over US 380 began in Feb. 2020.

Milestones

  • NTTA began preliminary route studies, schematic design work, environmental documentation, and public involvement for Phases 4A, 4B and 5A of the DNT extension project in November 2007.
  • The road that will become the DNT Phase 4A (U.S. 380 to FM 428) northbound frontage road opened to traffic in 2008 as a bi-directional, two-lane facility.
  • On March 16, 2009, the NTTA Board approved an expansion of the DNT 4B/5A (FM 428 to FM 121) study area to the west and north. The expansion captured more of Denton and Grayson counties and a small portion of southeast Cooke County, which enabled NTTA to identify and preserve right of way for the DNT corridor.
  • The NTTA Board selected a “county line” alignment on July 21, 2010, for the DNT Phase 4B/5A extension, from FM 428 in Collin and Denton counties to FM 121 in Grayson County.
  • On June 15, 2011, the NTTA Board approved the schematic design and environmental evaluation for the DNT Phase 4B/5A extension project.
  • At the February 2013 Board Meeting, an interlocal agreement with Denton County to advance the DNT Phase 4B southbound frontage road project was approved.
  • At the October 2014 Board Meeting, Burns & McDonnell Engineering, Inc. was approved to perform design engineering services for the DNT 4B southbound frontage road.At the October 2014 Board Meeting, Burns & McDonnell Engineering, Inc. was approved to perform design engineering services for the DNT 4B southbound frontage road.
  • In early 2017, the NTTA staff determined that it is no longer necessary to include “Phase 5A” as part of the project name.
  • The NTTA Board of Directors approved a request to advertise for design and engineering services for the DNT extension over U.S. 380 at their July 2017 meeting.
  • At the Dec. 2017 meeting, the NTTA Board of Directors awarded a contract to Brown and Gay Engineers to provide design and engineering services for the DNT main lane extension over U.S. 380.
  • In summer 2018, Collin County began constructing the southbound frontage road between FM 428 and U.S. 380.
  • On March 20, 2019, the NTTA Board of Directors approved a request to advertise for environmental engineering services for DNT 4A.
  • On July 16, 2019, as Notice Affording Opportunity for Public Hearing (NAOPH) was sent to elected officials and affected property owners for the DNT extension over US 380 project.
  • On July 16, 2019, as Notice Affording Opportunity for Public Hearing (NAOPH) was sent to elected officials and affected property owners for the DNT extension over US 380 project. The deadline for citizens/organizations to request a hearing for the DNT over US 380 project was Aug. 23. No requests were received.
  • On June 19, 2019, the NTTA Board of Directors approved a request to advertise for construction, construction management, and material testing for the DNT extension over US 380.
  • In Aug. 2019, NTTA Board of Directors awarded a contract for environmental engineering services to Garver for the DNT 4A project.
  • At their Sept. 2019 meeting, the NTTA Board of Directors selected LJA Engineering, Inc. for construction management and Team Consultants for materials testing for the DNT extension over US 380.
  • On, Sept. 26, 2019, NTTA staff and consultants participated in a “Meet & Greet” hosted by the Town of Prosper about the DNT Extension over US 380 project. Public and elected officials, residents and other interested individuals were provided project information.
  • In November, the NTTA Board of Directors selected Austin Bridge and Road for construction of the DNT Extension over US 380.
  • On Feb. 4, 2020, the NTTA hosts a pre-construction meeting for work on the DNT Extension over US 380.
  • Work began on the DNT Extension over US 380 on Feb 17, 2020.
  • In Summer 2020, beams began to be placed for the DNT Extension south of US 380.
  • In June 2020, column construction for the northbound main lanes was completed for the DNT Extension south of US 380.
  • The deadline for citizens/organizations to request a hearing for the DNT over US 380 project was Aug. 23. No requests were received.
  • On June 19, 2019, the NTTA Board of Directors approved a request to advertise for construction, construction management, and material testing for the DNT extension over US 380.
  • In Aug. 2019, NTTA Board of Directors awarded a contract for environmental engineering services to Garver for the DNT 4A project.
  • At their Sept. 2019 meeting, the NTTA Board of Directors selected LJA Engineering, Inc. for construction management and Team Consultants for materials testing for the DNT extension over US 380.
  • On, Sept. 26, 2019, NTTA staff and consultants participated in a “Meet & Greet” hosted by the Town of Prosper about the DNT Extension over US 380 project. Public and elected officials, residents and other interested individuals were provided project information.
  • In November, the NTTA Board of Directors selected Austin Bridge and Road for construction of the DNT Extension over US 380.
  • On Feb. 4, 2020, the NTTA hosts a pre-construction meeting for work on the DNT Extension over US 380.
  • Work began on the DNT Extension over US 380 on Feb 17, 2020.
  • In Summer 2020, beams began to be placed for the DNT Extension south of US 380.
  • In June 2020, column construction for the northbound main lanes was completed for the DNT Extension south of US 380.


Page Updated
October 2020

Project Information
Email: dnt45@ntta.org
Public Involvement: (972) 628-3134

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