US Bridges

Diamond Mill Rd. over I70

Good

Montgomery County, Ohio · .08MI.E. of Jct. SB-SR-49 · Structure no. 5705045

Built
1960
65 years old, rebuilt 1993
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
265 ft
4 main spans
Daily traffic
2,166
2015 count
Owner
State
State Highway Agency

About this bridge

Diamond Mill Rd. over I70 is a steel continuous stringer/multi-beam or girder carrying Diamond Mill Rd. over I70 in Montgomery County, Ohio. It was built in 1960 and reconstructed in 1993, so it is 65 years old, older than the Ohio average of 47.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,166 vehicles a day, roughly 5% of them trucks, projected to reach 6,367 by 2035. The structure is 265 ft (80.8 m) long and 31 ft wide.

Location

Open in Google Maps
CarriesDiamond Mill Rd.
CrossesI70
Location.08MI.E. of Jct. SB-SR-49
RouteCounty Highway 217
CountyMontgomery County
StateOhio
Coordinates39.85433, -84.36763
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.1 US tons
Inventory rating32.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length265 ft (80.8 m)
Longest span91 ft (27.7 m)
Deck width31 ft (9.3 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,166 (2015)
Projected traffic6,367 by 2035
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Diamond Mill Rd. over I70 built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1993.

What condition is Diamond Mill Rd. over I70 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does Diamond Mill Rd. over I70 carry?

About 2,166 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Diamond Mill Rd. over I70?

The structure is 265 ft (80.8 m) long with a longest span of 91 ft (27.7 m) and a deck 31 ft wide.

Who owns Diamond Mill Rd. over I70?

It is owned by the State Highway Agency.