US Bridges

SR3128 over Trib to Allegheny River

Fair

Armstrong County, Pennsylvania · Cadogan NO.2 · Structure no. 000000000003040

Built
1959
66 years old, rebuilt 2010
Condition
Fair
inspected October 2022
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
371 ft
4 main spans
Daily traffic
677
2024 count
Owner
State
State Highway Agency

About this bridge

SR3128 over Trib to Allegheny River is a steel continuous stringer/multi-beam or girder carrying SR3128 over Trib to Allegheny River in Armstrong County, Pennsylvania. It was built in 1959 and reconstructed in 2010, so it is 66 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 677 vehicles a day, roughly 6% of them trucks, projected to reach 1,913 by 2032. The structure is 371 ft (113.1 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSR3128
CrossesTrib to Allegheny River
LocationCadogan NO.2
RouteState Highway 0
CountyArmstrong County
StatePennsylvania
Coordinates40.75092, -79.58556
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71 US tons
Inventory rating55 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length371 ft (113.1 m)
Longest span103 ft (31.4 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic677 (2024)
Projected traffic1,913 by 2032
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$1.9 million
NavigationNo navigation control on waterway

Frequently asked questions

When was SR3128 over Trib to Allegheny River built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 2010.

What condition is SR3128 over Trib to Allegheny River 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 October 2022.

How much traffic does SR3128 over Trib to Allegheny River carry?

About 677 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is SR3128 over Trib to Allegheny River?

The structure is 371 ft (113.1 m) long with a longest span of 103 ft (31.4 m) and a deck 33 ft wide.

Who owns SR3128 over Trib to Allegheny River?

It is owned by the State Highway Agency.