US Bridges

County Road 30 over Miller Ditch

Good

Hardin County, Ohio · .4 MI E of JCT of CR 145 · Structure no. 3342884

Built
2020
5 years old
Condition
Good
inspected August 2024
Type
Box Beam or Girders - Multiple
Concrete
Length
32 ft
1 main span
Daily traffic
391
2016 count
Owner
County
County Highway Agency

About this bridge

County Road 30 over Miller Ditch is a concrete box beam or girders - multiple carrying County Road 30 over Miller Ditch in Hardin County, Ohio. It was built in 2020, so it is 5 years old, younger 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 391 vehicles a day, roughly 7% of them trucks, projected to reach 543 by 2036. The structure is 32 ft (9.8 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCounty Road 30
CrossesMiller Ditch
Location.4 MI E of JCT of CR 145
RouteCounty Highway C0030
CountyHardin County
StateOhio
Coordinates40.78997, -83.62933
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.9 US tons
Inventory rating34.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length32 ft (9.8 m)
Longest span29 ft (8.8 m)
Deck width24 ft (7.4 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic391 (2016)
Projected traffic543 by 2036
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 30 over Miller Ditch built?

It was built in 2020, making it 5 years old in 2025.

What condition is County Road 30 over Miller Ditch 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 August 2024.

How much traffic does County Road 30 over Miller Ditch carry?

About 391 vehicles per day (2016 count), of which roughly 7% are trucks.

How long is County Road 30 over Miller Ditch?

The structure is 32 ft (9.8 m) long with a longest span of 29 ft (8.8 m) and a deck 24 ft wide.

Who owns County Road 30 over Miller Ditch?

It is owned by the County Highway Agency.