US Bridges

T-771 Mcwilliams over Pine Run

Fair

Armstrong County, Pennsylvania · 420 W of SR-839 · Structure no. 000000000003402

Built
1959
66 years old
Condition
Fair
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
74 ft
1 main span
Daily traffic
50
2021 count
Owner
County
County Highway Agency

About this bridge

T-771 Mcwilliams over Pine Run is a prestressed concrete box beam or girders - multiple carrying T-771 Mcwilliams over Pine Run in Armstrong County, Pennsylvania. It was built in 1959, 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 50 vehicles a day, roughly 9% of them trucks, projected to reach 70 by 2041. The structure is 74 ft (22.6 m) long and 15 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesT-771 Mcwilliams
CrossesPine Run
Location420 W of SR-839
RouteCity Street 0
CountyArmstrong County
StatePennsylvania
Coordinates40.96314, -79.25309
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating37 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length74 ft (22.6 m)
Longest span68 ft (20.7 m)
Deck width15 ft (4.6 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2021)
Projected traffic70 by 2041
Trucks9%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was T-771 Mcwilliams over Pine Run built?

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

What condition is T-771 Mcwilliams over Pine Run 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 April 2023.

How much traffic does T-771 Mcwilliams over Pine Run carry?

About 50 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is T-771 Mcwilliams over Pine Run?

The structure is 74 ft (22.6 m) long with a longest span of 68 ft (20.7 m) and a deck 15 ft wide.

Who owns T-771 Mcwilliams over Pine Run?

It is owned by the County Highway Agency.