Title
Freeway Program Update
Description
This report provides the Transportation, Infrastructure and Innovation Subcommittee updates on the Arizona Department of Transportation (ADOT) freeway program within the City of Phoenix.
THIS ITEM IS FOR INFORMATION ONLY.
Report
Summary
The Maricopa Association of Governments (MAG) Regional Transportation Plan reflects numerous freeway construction projects and studies underway within the City of Phoenix. These projects are funded from the voter approved priorities in the Proposition 400 half-cent sales tax as well as from state and federal revenue sources. City of Phoenix staff are embedded with ADOT on these major construction projects to ensure coordination of all construction activities with City departments. This report is an overview of the current major freeway projects. A monthly report will be provided to the Transportation, Infrastructure and Innovation Subcommittee reflecting project changes as well as new projects.
South Mountain Freeway
The South Mountain Freeway is the last piece in completing the Loop 202 system. The 22-mile South Mountain Freeway will run east and west along Pecos Road and then north and south between 55th and 63rd avenues, connecting with Interstate 10 (I-10) on each end. This is the single largest freeway project in Arizona history - built at one time. The entire freeway is within the City of Phoenix.
Key elements of this project are:
- 40 bridge structures
- 15 traffic interchanges
- 11 miles of soundwalls
- 5 multi-use crossings
- 4.5 miles of improvements at I-10
- 6-mile shared use path
- Pedestrian bridge
Construction began in early 2017 and is scheduled for completion in December 2019.
Interstate 17 - Pinnacle Peak and Happy Valley Road
This project is rebuilding the traffic interchanges on Interstate 17 (I-17) at Happy Valley and Pinnacle Peak roads to improve safety and traffic flow as population growth and development in this area continues.
The bridge reconstruction at Pinnacle Peak Road will have two through lanes in each direction, bicycle lanes and pedestrian walkways. The bridge reconstruction at Happy Valley Road will remove the existing roundabouts and construct a Diverging Diamond traffic interchange with three through lanes in each direction, bicycle lanes and pedestrian walkways.
Construction began in November 2018 and is scheduled for completion in fall 2020.
Loop 101 - Interstate 17 to Pima Road
This project is widening and improving the Loop 101 (Pima Freeway) from I-17 in Phoenix east to Pima Road in Scottsdale. The improvements are needed to address growing traffic demands in the northeast Valley and relieve traffic congestion on the Loop 101 during the morning and evening peak travel periods.
The major elements of this project include adding one general purpose lane in each direction between I-17 and Pima Road, adding an auxiliary lane in each direction between Seventh Street and Cave Creek Road, and modifying freeway ramps and frontage road connections at 11 interchanges. Additional components include construction of noise or retaining walls where warranted, improvements to drainage and new rubberized asphalt resurfacing and pavement markings.
Construction began in February 2019 and is scheduled for completion in spring 2021.
Interstate 17 Frontage Road Drainage Improvement
This project will be constructing improvements to the cross-street drainage system along the I-17 frontage road between Greenway Road and Dunlap Avenue. The purpose of the project is to improve the drainage facilities that remove storm runoff from the Greenway, Thunderbird, Cactus, and Peoria cross streets, helping to reduce the potential for flooding at the I-17 overpasses.
The improvements will include a new, gravity-powered storm drain system, utilizing various sizes of concrete pipes and new drainage basins at Thunderbird Road, and the removal of the existing pump stations from the cross streets.
Construction is scheduled to begin in winter 2019.
Interstate 17 - Indian School Traffic Interchange Study
ADOT is conducting a study to improve traffic flow and safety at I-17 and Indian School Road. The study area encompasses Indian School Road between 19th and 31st avenues and I-17 from approximately one-half mile south and one-half mile north of Indian School Road
Approximately 50,000 vehicles use east- and westbound Indian School Road at I-17 per day. This volume is 40 percent higher than on Thomas Road at I-17 (one mile south) and 25 percent higher than on Camelback Road at I-17 (one mile north). Traffic congestion levels on Indian School Road at I-17 are projected to continue increasing.
After evaluating options for a new traffic interchange in this location, a three-level diamond interchange was advanced as the Recommended Build Alternative. This interchange would include:
- Flyover bridge along Indian School Road to allow east-west through traffic to bypass the intersections at the I-17 ramps and frontage roads
- New roadways approaching the flyover bridge with embankments and retaining walls
- Reconstructed and widened Indian School Road to accommodate the flyover bridge and new approaches
- Two new pedestrian bridges - one north and one south of Indian School Road - to allow pedestrians to cross I-17 safely
Construction is scheduled to begin in late 2020.
Interstate 10 - Broadway Curve
ADOT is studying concepts for proposed improvements to the I-10 Broadway Curve area between I-17 (Split) and Loop 202 (Santan Freeway). ADOT is drafting an Environmental Assessment (EA) that will evaluate the proposed improvements as compared to the no-build alternative which is the condition that would exist if the project was not built.
This 11-mile stretch of roadway is a key commerce corridor for the state and has seen increasing levels of traffic over the past few years, especially during the heavily traveled morning and evening peak hours.
The proposed improvements being studied include:
- Adding general purpose and high occupancy vehicle (HOV) lanes
- Adding a collector-distributor road system to reduce the number of lane changes on the freeway
- Improving connections between I-10 and the State Route 143 and Broadway Road to improve HOV lane connections
- Improving connections of I-10 and US 60 (Superstition Freeway)
- Constructing new bridges to accommodate new interchange facilities and additional lanes
- Building retaining and sound walls
- Constructing pedestrian bridge crossings to improve pedestrian access across the freeway
Construction is scheduled to begin in fall 2020.
Interstate 10 Deck Park (Hance Park) Tunnel Repair
The Deck Park Tunnel is an underpass that carries the I-10 freeway beneath downtown Phoenix between 3rd Avenue and 3rd Street. The tunnel consists of a series of nineteen side-by-side bridge structures. Construction of the facility began in 1983 and opened to traffic on Aug. 10, 1990. The tunnel carries approximately 230,000 vehicle trips per day and provides a critical link for regional connectivity and mobility.
Leaks in the ceiling structure of the Deck Park Tunnel have occurred in the past and continue to appear. The water infiltration caused by the leaks can lead to deterioration of the tunnel infrastructure and impacts the ventilation and electrical systems, which left unaddressed could force a future closure of the tunnel to traffic. There is also concern that any further future damage could result in a need for repairs that would require excavation of Margaret T. Hance Park, which is undergoing a major, $100 million revitalization expected to begin in March 2020.
ADOT, MAG and the City of Phoenix initiated an I-10 Deck Park Tunnel Waterproofing Study in May 2019 because of concern with the integrity of the tunnel. The goal of the study was to evaluate the current water-tightness of the tunnel structure and provide recommendations that minimize the potential for significant leak-related problems for the next 25 years.
The study concluded in August 2019 and recommended that all joints that have not been repaired in the last five years be replaced, which comprises 15 of the 19 total joints. ADOT intends on working closely with the City of Phoenix to coordinate construction activities of the joint work with the Hance Park revitalization project to minimize cost and public disturbance.
Construction is scheduled to begin in March 2020.
Department
Responsible Department
This item is submitted by Deputy City Manager Mario Paniagua and the City Manager’s Office.