US Bridges

Sonora RD over Millers Fork

Fair

Preble County, Ohio · 1st W of Millers Fork RD · Structure no. 6837239

Built
1979
46 years old
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
78 ft
1 main span
Daily traffic
144
2015 count
Owner
County
County Highway Agency

About this bridge

Sonora RD over Millers Fork is a prestressed concrete box beam or girders - multiple carrying Sonora RD over Millers Fork in Preble County, Ohio. It was built in 1979, so it is 46 years old, younger than the Ohio average of 47.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 144 vehicles a day, roughly 7% of them trucks, projected to reach 200 by 2035. The structure is 78 ft (23.8 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSonora RD
CrossesMillers Fork
Location1st W of Millers Fork RD
RouteCounty Highway T0445
CountyPreble County
StateOhio
Coordinates39.88811, -84.52214
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.8 US tons
Inventory rating33.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length78 ft (23.8 m)
Longest span72 ft (21.9 m)
Deck width24 ft (7.4 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic144 (2015)
Projected traffic200 by 2035
Trucks7%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 Sonora RD over Millers Fork built?

It was built in 1979, making it 46 years old in 2025.

What condition is Sonora RD over Millers Fork in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2024.

How much traffic does Sonora RD over Millers Fork carry?

About 144 vehicles per day (2015 count), of which roughly 7% are trucks.

How long is Sonora RD over Millers Fork?

The structure is 78 ft (23.8 m) long with a longest span of 72 ft (21.9 m) and a deck 24 ft wide.

Who owns Sonora RD over Millers Fork?

It is owned by the County Highway Agency.