US Bridges

Mid-County Exwy. over Wetlands / 3477-B6

Good

Delaware County, Pennsylvania · N.Conestoga Rd. 14G11 · Structure no. 000000000015136

Built
1989
36 years old
Condition
Good
inspected October 2023
Type
Culvert
Concrete
Length
25 ft
1 main span
Daily traffic
88,586
2024 count
Owner
State
State Highway Agency

About this bridge

Mid-County Exwy. over Wetlands / 3477-B6 is a concrete culvert carrying Mid-County Exwy. over Wetlands / 3477-B6 in Delaware County, Pennsylvania. It was built in 1989, so it is 36 years old, younger 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 88,586 vehicles a day, roughly 10% of them trucks, projected to reach 132,564 by 2032. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesMid-County Exwy.
CrossesWetlands / 3477-B6
LocationN.Conestoga Rd. 14G11
RouteInterstate 476
CountyDelaware County
StatePennsylvania
Coordinates40.0314, -75.36245
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating93 US tons
Inventory rating55 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 25 or greater
Structure length25 ft (7.6 m)
Longest span25 ft (7.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic88,586 (2024)
Projected traffic132,564 by 2032
Trucks10%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 Mid-County Exwy. over Wetlands / 3477-B6 built?

It was built in 1989, making it 36 years old in 2025.

What condition is Mid-County Exwy. over Wetlands / 3477-B6 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 Mid-County Exwy. over Wetlands / 3477-B6 carry?

About 88,586 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Mid-County Exwy. over Wetlands / 3477-B6?

The structure is 25 ft (7.6 m) long with a longest span of 25 ft (7.6 m).

Who owns Mid-County Exwy. over Wetlands / 3477-B6?

It is owned by the State Highway Agency.