Downtown Dayton Sub Corridor

I-75 Modernization Project nears completion

ODOT held a ribbon cutting ceremony on September 22, 2016 to mark the completion of the I-75 Modernization project through Downtown Dayton. After 10 years, and over $300 million invested, the project will officially comes to an end a year ahead of schedule and under budget.

A press release by ODOT District 7 Public Information Officer Mandi Dillon says“The newly constructed interstate creates a smoother, less congested commute for motorists, as well as new ramps in and out of the Dayton area,”

Complete coverage of the ribbon cutting ceremony can be seen here. More new coverage is available below


MVRPC Executive Director Brian O. Matin (click photo to enlarge)

The ribbon cutting (click photo to enlarge)


Originally developed as part of the North South Transportation Initiative, this project improves I-75 between Keowee Street and Edwin C Moses Boulevard to address safety and capacity concerns by adding continuous through lanes, eliminating left entrance and exit ramps, and increasing the spacing between interchanges. More information is available in the ODOT Project Management Plan. Ohio DOT maintains the official project information.

This project is divided into three phases:

Phase 1A: Interchange upgrades at SR 4 and Main Street-Grand Avenue

Photo rendering Phase 1A (click for larger PDF, 786kb)

  • Description: Improve the northbound curve on I-75 at SR 4 and increase the capacity of the interstate by adding an additional lane in each direction. Rebuild and improve the northernmost ramps at Stanley and close ramps at Grand, Riverside, Leo, Neva, and the southernmost ramps at Stanley
  • Construction Start: November 2007
  • Construction End: September 2011
  • Cost: $157 million
  • ODOT Animation of Phase 1A Changes

I-75 Phase 1A Reconstruction Before and After

Phase 1B: Addition of third lane on I-75 at the US 35 interchanges.

Photo rendering Phase 1B (click for larger PDF, 554kb)

  • Description: Modify the US 35 interchange to provide three continuous through lanes in each direction on I-75. Closing of the Albany Street ramps to/from I-75
  • Cost: $71 million
  • Construction start: March 2010 
  • Construction end: June 2013 

Phase 2: Re-design I-75 and ramps in Downtown Dayton

Photo rendering Phase 2 (click for larger PDF, 777kb)

  • Description: Replace the various left-side and right-side ramps with a single, improved, centrally located interchange to provide access to downtown Dayton.
  • Estimated Cost: $262 million
  • Status: Project is underway.
  • Construction start: October, 2012 
  • Construction end: September 2017 (estimated) 

Project Benefits:

  • Right hand entrances and exits
  • Increased spacing between ramps
  • Consolidated local access to ramps
  • Better traffic flow
  • Fewer traffic incidents and related congestion
  • Three continuous lanes for through traffic

ODOT Public Participation for Dayton Sub Corridor

On October 16, 2007, ODOT held a public meeting to share information with the community on the reconstruction and modernization of Interstate 75 through Dayton. The first phase of construction began in fall 2007.

Dayton Sub Corridor Design Aesthetics

MVRPC presented urban design concepts for consideration in the aesthetics portion of the I-75 downtown Dayton sub corridor design. These concepts represent a collective consensus among the City of Dayton, the Grandview Hospital, the Dayton Art Institute, and MVRPC.

ODOT combined the proposed designs from MVRPC and the City of Dayton into a conceptual design which incorporated further revisions. ODOT presented their Design Aesthetics Proposal.

Dayton Sub Corridor Noise Abatement

The Ohio Department of Transportation erected noise abatement walls along I-75. ODOT proposed a transparent noise wall rather than a solid noise wall on the north side (Grafton Hills neighborhood side) to preserve the view shed of the area’s major institutions such as the Dayton Art Institute, the Masonic Temple and Grandview Hospital. The south side of I-75 has solid noise walls.