US Bridges

SR 318 W.Middlesex over Over Lt Neshannock Creek

Fair

Mercer County, Pennsylvania · East Lackawannock Twp. · Structure no. 000000000025860

Built
1956
69 years old, rebuilt 2019
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
50 ft
1 main span
Daily traffic
1,409
2024 count
Owner
State
State Highway Agency

About this bridge

SR 318 W.Middlesex over Over Lt Neshannock Creek is a prestressed concrete box beam or girders - multiple carrying SR 318 W.Middlesex over Over Lt Neshannock Creek in Mercer County, Pennsylvania. It was built in 1956 and reconstructed in 2019, so it is 69 years old, older than the Pennsylvania average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 1,409 vehicles a day, roughly 12% of them trucks, projected to reach 2,710 by 2032. The structure is 50 ft (15.2 m) long and 35 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesSR 318 W.Middlesex
CrossesOver Lt Neshannock Creek
LocationEast Lackawannock Twp.
RouteState Highway 318
Coordinates41.21074, -80.31944
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length50 ft (15.2 m)
Longest span47 ft (14.3 m)
Deck width35 ft (10.7 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,409 (2024)
Projected traffic2,710 by 2032
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$37,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 318 W.Middlesex over Over Lt Neshannock Creek built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 2019.

What condition is SR 318 W.Middlesex over Over Lt Neshannock 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 September 2024.

How much traffic does SR 318 W.Middlesex over Over Lt Neshannock Creek carry?

About 1,409 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is SR 318 W.Middlesex over Over Lt Neshannock Creek?

The structure is 50 ft (15.2 m) long with a longest span of 47 ft (14.3 m) and a deck 35 ft wide.

Who owns SR 318 W.Middlesex over Over Lt Neshannock Creek?

It is owned by the State Highway Agency.