US Bridges

Delphos-St. Marys over Sixmile Creek

Good

Auglaize County, Ohio · 5.5 Mi. N. of S.R. 66 · Structure no. 0634697

Built
1988
37 years old, rebuilt 2018
Condition
Good
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
67 ft
1 main span
Daily traffic
103
2019 count
Owner
County
County Highway Agency

About this bridge

Delphos-St. Marys over Sixmile Creek is a prestressed concrete box beam or girders - multiple carrying Delphos-St. Marys over Sixmile Creek in Auglaize County, Ohio. It was built in 1988 and reconstructed in 2018, so it is 37 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 103 vehicles a day, roughly 2% of them trucks, projected to reach 1,203 by 2045. The structure is 67 ft (20.3 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesDelphos-St. Marys
CrossesSixmile Creek
Location5.5 Mi. N. of S.R. 66
RouteCounty Highway C066A
StateOhio
Coordinates40.62583, -84.35113
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating107.1 US tons
Inventory rating73.5 US tons

Structure

MaterialPrestressed Concrete
DeckNot applicable
Main spans1
Design loadHL 93
Structure length67 ft (20.3 m)
Longest span64 ft (19.5 m)
Deck width24 ft (7.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic103 (2019)
Projected traffic1,203 by 2045
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$254 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Delphos-St. Marys over Sixmile Creek built?

It was built in 1988, making it 37 years old in 2025. It was reconstructed in 2018.

What condition is Delphos-St. Marys over Sixmile Creek 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 April 2023.

How much traffic does Delphos-St. Marys over Sixmile Creek carry?

About 103 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is Delphos-St. Marys over Sixmile Creek?

The structure is 67 ft (20.3 m) long with a longest span of 64 ft (19.5 m) and a deck 24 ft wide.

Who owns Delphos-St. Marys over Sixmile Creek?

It is owned by the County Highway Agency.