US Bridges

Mifflin Road over Glass Run Road

Fair

Allegheny County, Pennsylvania · At Glenwood Interchange · Structure no. 000000000001304

Built
1963
62 years old, rebuilt 2011
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
132 ft
3 main spans
Daily traffic
8,984
2024 count
Owner
State
State Highway Agency

About this bridge

Mifflin Road over Glass Run Road is a prestressed concrete box beam or girders - multiple carrying Mifflin Road over Glass Run Road in Allegheny County, Pennsylvania. It was built in 1963 and reconstructed in 2011, so it is 62 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 8,984 vehicles a day, roughly 12% of them trucks, projected to reach 6,567 by 2032. The structure is 132 ft (40.2 m) long and 33 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesMifflin Road
CrossesGlass Run Road
LocationAt Glenwood Interchange
RouteState Highway 885
CountyAllegheny County
StatePennsylvania
Coordinates40.38966, -79.9341
Functional classUrban Other Principal Arterial

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.
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 geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating21.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length132 ft (40.2 m)
Longest span72 ft (21.9 m)
Deck width33 ft (10.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,984 (2024)
Projected traffic6,567 by 2032
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.8 mi (11 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$620,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mifflin Road over Glass Run Road built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 2011.

What condition is Mifflin Road over Glass Run Road 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 June 2023.

How much traffic does Mifflin Road over Glass Run Road carry?

About 8,984 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is Mifflin Road over Glass Run Road?

The structure is 132 ft (40.2 m) long with a longest span of 72 ft (21.9 m) and a deck 33 ft wide.

Who owns Mifflin Road over Glass Run Road?

It is owned by the State Highway Agency.