US Bridges

SR 318 W.Mdlsx-Mrc over Shenango River

Good

Mercer County, Pennsylvania · West Middlesex Borough · Structure no. 000000000056024

Built
2018
7 years old
Condition
Good
inspected December 2020
Type
Stringer/Multi-beam or Girder
Steel
Length
234 ft
1 main span
Daily traffic
4,723
2024 count
Owner
State
State Highway Agency

About this bridge

SR 318 W.Mdlsx-Mrc over Shenango River is a steel stringer/multi-beam or girder carrying SR 318 W.Mdlsx-Mrc over Shenango River in Mercer County, Pennsylvania. It was built in 2018, so it is 7 years old, younger than the Pennsylvania average of 54.8 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 4,723 vehicles a day, roughly 10% of them trucks, projected to reach 5,958 by 2032. The structure is 234 ft (71.3 m) long and 37 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesSR 318 W.Mdlsx-Mrc
CrossesShenango River
LocationWest Middlesex Borough
RouteState Highway 318
CountyMercer County
StatePennsylvania
Coordinates41.17238, -80.45961
Functional classUrban Collector

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 protection8 Very GoodNo problems noted.
Last inspectionDecember 2020
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.7 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length234 ft (71.3 m)
Longest span230 ft (70.1 m)
Deck width37 ft (11.4 m)
Roadway width34 ft (10.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,723 (2024)
Projected traffic5,958 by 2032
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 318 W.Mdlsx-Mrc over Shenango River built?

It was built in 2018, making it 7 years old in 2025.

What condition is SR 318 W.Mdlsx-Mrc over Shenango River 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 December 2020.

How much traffic does SR 318 W.Mdlsx-Mrc over Shenango River carry?

About 4,723 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is SR 318 W.Mdlsx-Mrc over Shenango River?

The structure is 234 ft (71.3 m) long with a longest span of 230 ft (70.1 m) and a deck 37 ft wide.

Who owns SR 318 W.Mdlsx-Mrc over Shenango River?

It is owned by the State Highway Agency.