US Bridges

Mahoning Ave over Shenango R Nci RR

Fair

Lawrence County, Pennsylvania · Mahoning Ave. Viaduct · Structure no. 000000000022183

Built
1923
102 years old, rebuilt 2017
Condition
Fair
inspected November 2023
Type
Truss - Thru
Steel
Length
1,195 ft
3 main spans
Daily traffic
3,473
2024 count
Owner
Railroad
Railroad

About this bridge

Mahoning Ave over Shenango R Nci RR is a steel truss - thru carrying Mahoning Ave over Shenango R Nci RR in Lawrence County, Pennsylvania. It was built in 1923 and reconstructed in 2017, so it is 102 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 3,473 vehicles a day, roughly 9% of them trucks, projected to reach 10,144 by 2039. The structure is 1,195 ft (364.2 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesMahoning Ave
CrossesShenango R Nci RR
LocationMahoning Ave. Viaduct
RouteState Highway 18
CountyLawrence County
StatePennsylvania
Coordinates40.9818, -80.3549
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46 US tons
Inventory rating3 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans3 (+8 approach)
Design loadHS 20
Structure length1,195 ft (364.2 m)
Longest span307 ft (93.6 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9 m)
Vertical clearance over deck18 ft (5.6 m)

Traffic and service

Average daily traffic3,473 (2024)
Projected traffic10,144 by 2039
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad and waterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerRailroad
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$21 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Mahoning Ave over Shenango R Nci RR built?

It was built in 1923, making it 102 years old in 2025. It was reconstructed in 2017.

What condition is Mahoning Ave over Shenango R Nci RR 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 November 2023.

How much traffic does Mahoning Ave over Shenango R Nci RR carry?

About 3,473 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is Mahoning Ave over Shenango R Nci RR?

The structure is 1,195 ft (364.2 m) long with a longest span of 307 ft (93.6 m) and a deck 32 ft wide.

Who owns Mahoning Ave over Shenango R Nci RR?

It is owned by the Railroad and maintained by the County Highway Agency.