US Bridges

Mifflin RD over SR 8059(RAMP A)

Good

Allegheny County, Pennsylvania · Glenwood Interchange · Structure no. 000000000001309

Built
1967
58 years old, rebuilt 2017
Condition
Good
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
79 ft
1 main span
Daily traffic
17,497
2024 count
Owner
State
State Highway Agency

About this bridge

Mifflin RD over SR 8059(RAMP A) is a prestressed concrete box beam or girders - multiple carrying Mifflin RD over SR 8059(RAMP A) in Allegheny County, Pennsylvania. It was built in 1967 and reconstructed in 2017, so it is 58 years old, older than the Pennsylvania average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 17,497 vehicles a day, roughly 10% of them trucks, projected to reach 13,307 by 2032. The structure is 79 ft (24.1 m) long and 70 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesMifflin RD
CrossesSR 8059(RAMP A)
LocationGlenwood Interchange
RouteState Highway 885
CountyAllegheny County
StatePennsylvania
Coordinates40.39325, -79.93483
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 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 geometry7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating61 US tons
Inventory rating20 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length79 ft (24.1 m)
Longest span72 ft (21.9 m)
Deck width70 ft (21.3 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,497 (2024)
Projected traffic13,307 by 2032
Trucks10%
Lanes on structure4
Traffic directionTwo-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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$550,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mifflin RD over SR 8059(RAMP A) built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 2017.

What condition is Mifflin RD over SR 8059(RAMP A) in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does Mifflin RD over SR 8059(RAMP A) carry?

About 17,497 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Mifflin RD over SR 8059(RAMP A)?

The structure is 79 ft (24.1 m) long with a longest span of 72 ft (21.9 m) and a deck 70 ft wide.

Who owns Mifflin RD over SR 8059(RAMP A)?

It is owned by the State Highway Agency.