US Bridges

SR 646 over Conotton CR

Good

Harrison County, Ohio · 6.59 MI E of US 22 · Structure no. 3402975

Built
1955
70 years old, rebuilt 1998
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
134 ft
3 main spans
Daily traffic
1,668
2015 count
Owner
State
State Highway Agency

About this bridge

SR 646 over Conotton CR is a steel continuous stringer/multi-beam or girder carrying SR 646 over Conotton CR in Harrison County, Ohio. It was built in 1955 and reconstructed in 1998, so it is 70 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 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 1,668 vehicles a day, roughly 11% of them trucks, projected to reach 2,315 by 2035. The structure is 134 ft (40.8 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSR 646
CrossesConotton CR
Location6.59 MI E of US 22
RouteState Highway 646
CountyHarrison County
StateOhio
Coordinates40.39396, -81.08438
Functional classRural Major Collector

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 protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable 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 alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating52.9 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length134 ft (40.8 m)
Longest span50 ft (15.2 m)
Deck width41 ft (12.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,668 (2015)
Projected traffic2,315 by 2035
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 646 over Conotton CR built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1998.

What condition is SR 646 over Conotton CR 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 June 2024.

How much traffic does SR 646 over Conotton CR carry?

About 1,668 vehicles per day (2015 count), of which roughly 11% are trucks.

How long is SR 646 over Conotton CR?

The structure is 134 ft (40.8 m) long with a longest span of 50 ft (15.2 m) and a deck 41 ft wide.

Who owns SR 646 over Conotton CR?

It is owned by the State Highway Agency.