Interstate 675 Ohio

Interstate 675 Ohio

Overview

Connecting I-75 in Miami Township with I-70 in Mad River Township, Interstate 675 forms an eastern bypass of Dayton to the south and east, providing part of a regional route south to Cincinnati and east to Springfield. The freeway loop also travels through the cities of Centerville, Kettering, Beavercreek and Fairborn and serves Wright-Patterson Air Force Base.

History

The original proposed alignment for Interstate 675 called for it to loop back to I-75 in the vicinity of Northridge. It was later realigned to link with I-70 west of Springfield.

Interstate 675 was approved by the American Association of State Highway and Transportation Officials (AASHTO) on June 23, 1969. The freeway was completed by 1989.

Route Information

  • North End – Medway, OH

  • South End – Miamisburg, OH

  • Mileage – 26.97

  • Cities – Centerville, Kettering, Beavercreek, Dayton, Fairborn

  • Junctions – I-75 I-70

Source: June 18, 2025 Ohio Department of Transportation (ODOT) Straight Line Diagrams

I-675 Annual Average Daily Traffic (AADT)

Source: 2017/18 AADT – ODOT Transportation Data Management System

North End I-70 Ohio State Route 4 / Spangler Road – Medway, Ohio

I-675 North at I-70 Ohio State Route 4

I-675 north at I-70/SR 4 - Medway, OH

Exit 24 leaves Interstate 675 north for SR 444 to Holiday Valley and the village of Enon 1.25 miles south of I-70/SR 4. SR 4 overlaps with I-70 for six miles between freeway spurs to Wright-Patterson AFB and Springfield. Photo by Chris and Amber Lokken (05/10/08).

I-675 north at I-70/SR 4 - Medway, OH

Exit 26 A for Interstate 70 and SR 4 to Springfield and Columbus departs beyond the Haddix Road overpass. Photo by Eric Stuve (07/29/17).

I-675 north at I-70/SR 4 - Medway, OH

Interstate 675 concludes at a cloverleaf interchange (Exits 26 A/B) with I-70 and SR 4 southeast of Medway. Photo by Chris and Amber Lokken (05/10/08).

I-675 north at I-70/SR 4 - Medway, OH

Interstate 70 travels 106 miles west to Indianapolis, Indiana by way of Vandalia, Richmond and Greenfield, Indiana. Spangler Road extends northwest as a local route into unincorporated Medway. Photo by Chris and Amber Lokken (05/10/08).

I-70 Ohio State Route 4 East at I-675

I-70/SR 4 east at I-675 - Medway, OH

SR 4 combines with Interstate 70 east ahead of the cloverleaf interchange (Exit 44) with I-675 south and Spangler Road north. Photo by Steve Hanudel (08/20/05).

I-70/SR 4 east at I-675 - Medway, OH

One mile ahead of Exit 44 A for I-675 south to Wright Patterson Air Force Base, the city of Fairborn, and Wright State University. Photo by Chris and Amber Lokken (05/10/08).

I-70/SR 4 east at I-675 - Medway, OH

Interstate 675 wraps around the east side of the Dayton area, leading to I-75 south toward Cincinnati from Miamisburg. Photo by Chris and Amber Lokken (05/10/08).

I-70/SR 4 east at I-675 - Medway, OH

Exit 44 A leaves I-70/SR 4 east for Interstate 675 south. Exit 44 B follows onto Spangler Road (Township Road 335) north to Medway. Photo by Chris and Amber Lokken (05/10/08).

I-675 North at I-70 Ohio State Route 4

I-675 south at I-70/SR 4 - Medway, OH

Spangler Road crosses the Mad River and transitions into Interstate 675 south at the cloverleaf interchange (Exit 26) with I-70/SR 4. Photo by Chris and Amber Lokken (05/10/08).

I-675 south at I-70/SR 4 - Medway, OH

The succeeding ramp connects Spangler Road and the beginning of I-675 south with Interstate 70 and SR 4 east to Springfield and Columbus. Photo by Chris and Amber Lokken (05/10/08).

South End – I-75 – Miamisburg, Ohio

I-675 South at I-75

I-675 south at I-75 - Miamisburg, OH

I-675 narrows from six to four lanes at the parclo interchange (Exit 2) with SR 725. The freeway converges with I-75 south of Dayton Mall in 1.5 miles. Photo by Steve Hanudel (08/20/05).

I-675 south at I-75 - Miamisburg, OH

Three quarters of a mile out from the directional T interchange with Interstate 75. Photo by Chris and Amber Lokken (05/10/08).

I-675 south at I-75 - Miamisburg, OH

The southbound mainline of I-675 defaults onto Interstate 75 south through Miamisburg, Springboro and Franklin. Photo by Chris and Amber Lokken (05/10/08).

I-675 south at I-75 - Miamisburg, OH

A pair of end shields stand at the northbound ramp for I-75 to West Carrollton, Moraine and Dayton. Photo by Steve Hanudel (08/20/05).

I-75 North at I-675

I-75 north at I-675 - Miamisburg, OH

Interstate 75 straddles the Springboro city line ahead of Miamisburg and the split with I-675 at Exit 43. Photo by Chris and Amber Lokken (05/10/08).

I-75 north at I-675 - Miamisburg, OH

Construction in 2009/10 added a diamond interchange with Austin Boulevard one mile south of the separation with Interstate 675. Photo by Chris and Amber Lokken (05/10/08).

I-75 north at I-675 - Miamisburg, OH

Interstate 675 travels 17.2 miles north from I-75 to SR 844 (McClerron Memorial Skyway), a freeway spur north to Wright State University and Wright-Patterson Air Force Base. Photo by Eric Stuve (07/29/17).

I-75 north at I-675 - Miamisburg, OH

A lane drop occurs at Exit 43 for Interstate 675 north to I-70 east for Columbus. Photo by Eric Stuve (07/29/17).

I-75 north at I-675 - Miamisburg, OH

Interstate 675 branches northeast between Centerville and Kettering. I-75 continues north to Dayton and Toledo. Photo by Eric Stuve (07/29/17).

I-75 South at I-675

I-75 south at I-675 - Miamisburg, OH

Heading south through Miami Township, Interstate 75 meets SR 725 along a commercialized stretch west of Dayton Mall and north of I-675. Photo by Eric Stuve (05/14/17).

I-75 south at I-675 - Miamisburg, OH

SR 725 travels east from Exit 44 to I-675 at Exit 2 en route to the city of Centerville and west across Miamisburg to SR 4 in Germantown. Photo by Eric Stuve (05/14/17).

I-75 south at I-675 - Miamisburg, OH

Interstate 75 south enters the directional T interchange (Exit 43) with I-675 north just beyond the Lyons Road overpass. Photo by Eric Stuve (07/23/14).

I-75 south at I-675 - Miamisburg, OH

Interstate 675 runs east from Exit 43 to Centerville before turning north into Beavercreek. Photo by Eric Stuve (05/14/17).

Page updated July 1, 2022.