On May 12, ODOT approved a plan recommending a Diverging Diamond Interchange to improve safety and traffic flow on Wilmington Pike at I-675. Its design prevents left turns across oncoming traffic by temporarily shifting drivers on Wilmington Pike to the left side of the road, then back.
ODOT chose the Diverging Diamond over a Split Interchange because it “best meets the project’s purpose and need while minimizing cost and complexity,” according to Centerville officials.
Design work is set to begin by 2026, with construction starting in 2029.
Plans for the first phase of the project, a partnership between Centerville and Sugarcreek Twp., include adding an extra lane to Wilmington Pike and extending dedicated turn lanes on Clyo Road south of I-675 to reduce congestion, according to Centerville officials.
A diagram released by the city of Centerville shows the five phases of the planned project the south phase along Wilmington Pike and Clyo Road, a main phase constructing the diverging diamond interchange and its associated ramps, a separate phase to widen the southbound I-675 exit ramp to Wilmington Pike, and two north phases on Feedwire Road, stretching from just west of Wilmington Pike, east past the I-675 bridge and Clyo Road, to Brookdale Blvd.
Enhancements to pedestrian connectivity are also part of the initiative.
“This area is not just an economic engine for Greene and Montgomery counties and Wright-Patterson Air Force Base, but for the region as well,” Centerville City Manager Wayne Davis said. “We are proud to be leading this effort with Sugarcreek Twp. and to have the strong support of our state and federal partners.
“Without a doubt, a project of this scale is in our nation’s interest as we improve access to Wright-Patterson Air Force Base.”
I-675 often has heavy rush hour traffic to the base, much of it using the Colonel Glenn exit 8 miles north of the Wilmington Pike interchange.
The five-phase infrastructure improvement plan is the result of more than five years of planning and collaboration with local, state and federal partners, Centerville said.
It has earned support from the Ohio Department of Transportation, Miami Valley Regional Planning Commission, the Dayton Development Coalition and the Dayton Area Chamber of Commerce.
This interchange work was the top-ranked project in the last Miami Valley Regional Planning Commission (MVRPC) funding cycle, which is based upon safety and impact.
Centerville said it has secured funding to advance Phase 1 of the Wilmington Pike/Clyo Road interchange improvements.
Funding for Phase 1 includes $3 million in federal money from the MVRPC and $3.8 million in Congressional Directed Spending and local funds for planning and environmental assessments.
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The city said that a Interchange Feasibility Study and Alternative Evaluation Report cost $792,000 in Transportation Review Advisory Council (TRAC) and local funding and an Influence Area Feasibility Study cost $619,000 in local funding.
Officials are seeking financial support for the remaining four phases, and Centerville, as the local public agency, is working with Sugarcreek Twp. to finalize designs and secure land for future phases.
Officials plan to seek similar financial support for the remaining four phases.
A decision about whether the Feedwire Road bridge portion of the project will proceed to construction has not yet been made, according to the city.
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