US Bridges

SR 18 over Over NS R R/Siding

Fair

Mercer County, Pennsylvania · Pymatuning Township · Structure no. 000000000025635

Built
1971
54 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
212 ft
3 main spans
Daily traffic
6,978
2024 count
Owner
State
State Highway Agency

About this bridge

SR 18 over Over NS R R/Siding is a prestressed concrete stringer/multi-beam or girder carrying SR 18 over Over NS R R/Siding in Mercer County, Pennsylvania. It was built in 1971, so it is 54 years old, younger 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 6,978 vehicles a day, roughly 6% of them trucks, projected to reach 9,576 by 2032. The structure is 212 ft (64.6 m) long and 82 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR 18
CrossesOver NS R R/Siding
LocationPymatuning Township
RouteState Highway 18
CountyMercer County
StatePennsylvania
Coordinates41.3555, -80.41126
Functional classUrban Other Principal Arterial

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80 US tons
Inventory rating15 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length212 ft (64.6 m)
Longest span76 ft (23.2 m)
Deck width82 ft (25 m)
Roadway width76 ft (23.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,978 (2024)
Projected traffic9,576 by 2032
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$585,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 18 over Over NS R R/Siding built?

It was built in 1971, making it 54 years old in 2025.

What condition is SR 18 over Over NS R R/Siding 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 May 2023.

How much traffic does SR 18 over Over NS R R/Siding carry?

About 6,978 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is SR 18 over Over NS R R/Siding?

The structure is 212 ft (64.6 m) long with a longest span of 76 ft (23.2 m) and a deck 82 ft wide.

Who owns SR 18 over Over NS R R/Siding?

It is owned by the State Highway Agency.