US Bridges

S.R. 642 over Over S.R. 147

Good

Northumberland County, Pennsylvania · 1 MI E of Milton · Structure no. 000000000029117

Built
1970
55 years old, rebuilt 2004
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
247 ft
4 main spans
Daily traffic
6,829
2023 count
Owner
State
State Highway Agency

About this bridge

S.R. 642 over Over S.R. 147 is a prestressed concrete stringer/multi-beam or girder carrying S.R. 642 over Over S.R. 147 in Northumberland County, Pennsylvania. It was built in 1970 and reconstructed in 2004, so it is 55 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 6,829 vehicles a day, roughly 4% of them trucks, projected to reach 7,575 by 2032. The structure is 247 ft (75.3 m) long and 48 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesS.R. 642
CrossesOver S.R. 147
Location1 MI E of Milton
RouteState Highway 642
CountyNorthumberland County
StatePennsylvania
Coordinates41.00803, -76.83029
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 inspectionDecember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.1 US tons
Inventory rating47 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length247 ft (75.3 m)
Longest span79 ft (24.1 m)
Deck width48 ft (14.6 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,829 (2023)
Projected traffic7,575 by 2032
Trucks4%
Lanes on structure2
Traffic directionTwo-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$234,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was S.R. 642 over Over S.R. 147 built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 2004.

What condition is S.R. 642 over Over S.R. 147 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 December 2023.

How much traffic does S.R. 642 over Over S.R. 147 carry?

About 6,829 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is S.R. 642 over Over S.R. 147?

The structure is 247 ft (75.3 m) long with a longest span of 79 ft (24.1 m) and a deck 48 ft wide.

Who owns S.R. 642 over Over S.R. 147?

It is owned by the State Highway Agency.