US Bridges

Milroy ST over I-279(LR 1021)NB Sb&hov

Poor

Allegheny County, Pennsylvania · 136 Milroy ST Bridge · Structure no. 000000000001060

Built
1986
39 years old
Condition
Poor
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
354 ft
3 main spans
Daily traffic
300
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Milroy ST over I-279(LR 1021)NB Sb&hov is a steel continuous stringer/multi-beam or girder carrying Milroy ST over I-279(LR 1021)NB Sb&hov in Allegheny County, Pennsylvania. It was built in 1986, so it is 39 years old, younger than the Pennsylvania average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 300 vehicles a day, roughly 10% of them trucks, projected to reach 300 by 2021. The structure is 354 ft (107.9 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesMilroy ST
CrossesI-279(LR 1021)NB Sb&hov
Location136 Milroy ST Bridge
RouteCity Street 0
CountyAllegheny County
StatePennsylvania
Coordinates40.4768, -80.00757
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.1 US tons
Inventory rating54 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length354 ft (107.9 m)
Longest span210 ft (64 m)
Deck width33 ft (10.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2021)
Projected traffic300 by 2021
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Milroy ST over I-279(LR 1021)NB Sb&hov built?

It was built in 1986, making it 39 years old in 2025.

What condition is Milroy ST over I-279(LR 1021)NB Sb&hov in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2023.

How much traffic does Milroy ST over I-279(LR 1021)NB Sb&hov carry?

About 300 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Milroy ST over I-279(LR 1021)NB Sb&hov?

The structure is 354 ft (107.9 m) long with a longest span of 210 ft (64 m) and a deck 33 ft wide.

Who owns Milroy ST over I-279(LR 1021)NB Sb&hov?

It is owned by the City or Municipal Highway Agency.