State Route 30 (Tres Rios Freeway)

State Route (SR 30) is a new freeway located between State Route 85 (SR 85) to Interstate 17 (I-17). It is also known as the Tres Rios Freeway. SR 30 connects the cities of Buckeye, Goodyear, Avondale, and Phoenix and serves as an “I-10 Reliever” to help ease congestion along Interstate 10.

 

 

SR 30 is being constructed in three segments:

• West: SR 85 to Loop 303
• Center: Loop 303 to Loop 202
• East:  Loop 202 to I-17

Project Segments and Phasing

The Center segment is located from Loop 303 to Loop 202 and is slated for construction beginning in 2027. It has been identified as the highest priority due to its ability to significantly reduce I-10 congestion. It will be built as a six-lane facility (three lanes each direction), with interchanges planned at both loops on either end.

• Final design underway or expected to initiate in fiscal year (FY) 2026
• Constructed in phases from east to west; estimated to cost $3.5 billion (year of expenditure)
  • 97th Avenue to Loop 202: FY 2027
  • Dysart Road to 97th Avenue: FY 2029
  • SR 303 (Estrella Pkwy) to Dysart Road: FY 2031
  • SR 303/SR 30 System Interchange to Estrella Parkway: FY 2033

 

 

Progress to date:

Proposition 479, the extension of a dedicated half cent sales tax for transportation, was approved by voters in November 2024, providing the necessary funding to construct SR 30. However, to ensure construction could begin quickly, prior to Prop 479, the MAG Regional Council set aside funding for right of way acquisition, utility relocation, and final design. This paved the way for construction to start in fiscal year 2027.

• $600M+ invested in right-of-way and utility relocation
  • 433 parcels need to be acquired; 70 percent have been acquired or are in progress
  • Final design of first utility conflict (APS waterline at 99th Ave) is 90 percent complete
  • Final design is underway and on track for completion by winter 2026 (97th Ave to Loop 202).

 

 

The East segment is located from Loop 202 to I-17. Construction is slated to begin in fiscal year (FY) 2045.

• Starting in FY 2027, the preliminary design/environmental work between the I-17 Split (the interchange where I-10 splits/merges with I-17 near Phoenix Sky Harbor International Airport) to the “Stack” (four-level interchange connecting I-10 and I-17 near 19th Avenue and McDowell Road) will determine the connection with SR 30 east.

The East segment is located from Loop 202 to I-17). Construction is slated to begin in fiscal year (FY) 2045.

Progress to date:

• East segment: MAG study looking at possible alignments for SR 30 east completed in September 2021

The West segment is located from SR 85 to Loop 303. Construction is planned for fiscal year (FY) 2046.

• Currently in its early stages, no formal project development has been initiated. However, funding has been allocated, and preliminary design/environmental work is planned to start in FY 2027.
• Interim improvements funded under Prop 479
• Full buildout expected after program horizon of 2045

What will the final freeway look like?

SR 30 is planned as a six-lane freeway facility for both the Center and East segments, with full system interchanges at Loop 202 and Loop 303. While interim improvements are funded for the West segment, full buildout is expected after the Prop 479 program horizon (FY 2046). The exact interim improvements will be identified as part of the environmental/scoping effort for this segment.

SR 30 Benefits

Thousands of cars and trucks travel on I-10 through the West Valley every day. At peak times, the lines of traffic can stretch for miles. With more distribution centers and warehouses springing up along the Loop 303 corridor, traffic on I-10 west of downtown Phoenix is only projected to increase. SR 30 will provide much-needed relief for I-10 congestion. All three segments of SR 30 are at different stages of the planning and development process. The Center segment has been identified as the highest priority for construction, as it will have the greatest and most immediate impact. Benefits of the Center segment include:

• Estimated to save about 32 million passenger hours over the five-year period following completion of construction
• By 2040, it provides a 20 percent reduction in I-10 rush hour drive time
• Expected to carry traffic volumes as high as 177,000 daily vehicles by 2050

The Prop 479 Freeway Life Cycle Program (FLCP) is the management tool for the freeway and highway projects funded through Proposition 479, such as the SR 30 corridor. For further information on other FLCP projects, please visit the following link: https://azmag.gov/Programs/Transportation/Freeway-Life-Cycle-Program