US Bridges

PA309 (lr 226) over Trib. Mill Creek

Good

Lehigh County, Pennsylvania · 1 Mi.N.Of PA873 · Structure no. 000000000023168

Built
1962
63 years old, rebuilt 2011
Condition
Good
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
36 ft
1 main span
Daily traffic
4,479
2023 count
Owner
State
State Highway Agency

About this bridge

PA309 (lr 226) over Trib. Mill Creek is a prestressed concrete box beam or girders - multiple carrying PA309 (lr 226) over Trib. Mill Creek in Lehigh County, Pennsylvania. It was built in 1962 and reconstructed in 2011, so it is 63 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 4,479 vehicles a day, roughly 5% of them trucks, projected to reach 7,374 by 2032. The structure is 36 ft (11 m) long and 43 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesPA309 (lr 226)
CrossesTrib. Mill Creek
Location1 Mi.N.Of PA873
RouteState Highway 309
CountyLehigh County
StatePennsylvania
Coordinates40.67943, -75.6291
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating68.6 US tons
Inventory rating42.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length36 ft (11 m)
Longest span34 ft (10.4 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,479 (2023)
Projected traffic7,374 by 2032
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was PA309 (lr 226) over Trib. Mill Creek built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2011.

What condition is PA309 (lr 226) over Trib. Mill Creek 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 October 2023.

How much traffic does PA309 (lr 226) over Trib. Mill Creek carry?

About 4,479 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is PA309 (lr 226) over Trib. Mill Creek?

The structure is 36 ft (11 m) long with a longest span of 34 ft (10.4 m) and a deck 43 ft wide.

Who owns PA309 (lr 226) over Trib. Mill Creek?

It is owned by the State Highway Agency.