US Bridges

Ramp M over 10th ST at 2nd Ave

Fair

Allegheny County, Pennsylvania · At Armstrong Tunnel · Structure no. 000000000002913

Built
1956
69 years old, rebuilt 1985
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
405 ft
3 main spans
Daily traffic
1,940
2024 count
Owner
State
State Highway Agency

About this bridge

Ramp M over 10th ST at 2nd Ave is a steel continuous stringer/multi-beam or girder carrying Ramp M over 10th ST at 2nd Ave in Allegheny County, Pennsylvania. It was built in 1956 and reconstructed in 1985, so it is 69 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 6 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 1,940 vehicles a day, roughly 7% of them trucks, projected to reach 6,019 by 2031. The structure is 405 ft (123.4 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesRamp M
Crosses10th ST at 2nd Ave
LocationAt Armstrong Tunnel
RouteState Highway 0
CountyAllegheny County
StatePennsylvania
Coordinates40.425, -79.95833
Functional classUrban Principal Arterial - Interstate

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
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 20
Structure length405 ft (123.4 m)
Longest span154 ft (46.9 m)
Deck width26 ft (7.8 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deck18 ft (5.4 m)

Traffic and service

Average daily traffic1,940 (2024)
Projected traffic6,019 by 2031
Trucks7%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ramp M over 10th ST at 2nd Ave built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1985.

What condition is Ramp M over 10th ST at 2nd Ave 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 July 2023.

How much traffic does Ramp M over 10th ST at 2nd Ave carry?

About 1,940 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is Ramp M over 10th ST at 2nd Ave?

The structure is 405 ft (123.4 m) long with a longest span of 154 ft (46.9 m) and a deck 26 ft wide.

Who owns Ramp M over 10th ST at 2nd Ave?

It is owned by the State Highway Agency.