US Bridges

Neptune Mendon RD over Eightmile Creek

Fair

Mercer County, Ohio · 0.3 MI S Denny Road · Structure no. 5433444

Built
1900
125 years old, rebuilt 2004
Condition
Fair
inspected November 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
52 ft
1 main span
Daily traffic
133
2015 count
Owner
County
County Highway Agency

About this bridge

Neptune Mendon RD over Eightmile Creek is a prestressed concrete box beam or girders - multiple carrying Neptune Mendon RD over Eightmile Creek in Mercer County, Ohio. It was built in 1900 and reconstructed in 2004, so it is 125 years old, older 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 133 vehicles a day, roughly 8% of them trucks, projected to reach 185 by 2035. The structure is 52 ft (15.9 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesNeptune Mendon RD
CrossesEightmile Creek
Location0.3 MI S Denny Road
RouteCounty Highway C161C
CountyMercer County
StateOhio
Coordinates40.6374, -84.48948
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20 + Mod
Structure length52 ft (15.9 m)
Longest span51 ft (15.5 m)
Deck width32 ft (9.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic133 (2015)
Projected traffic185 by 2035
Trucks8%
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$50,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Neptune Mendon RD over Eightmile Creek built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 2004.

What condition is Neptune Mendon RD over Eightmile Creek 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 November 2024.

How much traffic does Neptune Mendon RD over Eightmile Creek carry?

About 133 vehicles per day (2015 count), of which roughly 8% are trucks.

How long is Neptune Mendon RD over Eightmile Creek?

The structure is 52 ft (15.9 m) long with a longest span of 51 ft (15.5 m) and a deck 32 ft wide.

Who owns Neptune Mendon RD over Eightmile Creek?

It is owned by the County Highway Agency.