US Bridges

SR 642 over Over Mahoning Cr.

Good

Montour County, Pennsylvania · 5 MI NE of Danville · Structure no. 000000000028375

Built
1994
31 years old
Condition
Good
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
52 ft
1 main span
Daily traffic
2,057
2023 count
Owner
State
State Highway Agency

About this bridge

SR 642 over Over Mahoning Cr. is a prestressed concrete box beam or girders - multiple carrying SR 642 over Over Mahoning Cr. in Montour County, Pennsylvania. It was built in 1994, so it is 31 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 2,057 vehicles a day, roughly 6% of them trucks, projected to reach 3,020 by 2032. The structure is 52 ft (15.8 m) long and 36 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesSR 642
CrossesOver Mahoning Cr.
Location5 MI NE of Danville
RouteState Highway 642
CountyMontour County
StatePennsylvania
Coordinates41.01052, -76.61112
Functional classRural Major Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating56 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length52 ft (15.8 m)
Longest span50 ft (15.2 m)
Deck width36 ft (10.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,057 (2023)
Projected traffic3,020 by 2032
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 km)
TollOn a free road
National Highway SystemNo

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 SR 642 over Over Mahoning Cr. built?

It was built in 1994, making it 31 years old in 2025.

What condition is SR 642 over Over Mahoning Cr. 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 SR 642 over Over Mahoning Cr. carry?

About 2,057 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is SR 642 over Over Mahoning Cr.?

The structure is 52 ft (15.8 m) long with a longest span of 50 ft (15.2 m) and a deck 36 ft wide.

Who owns SR 642 over Over Mahoning Cr.?

It is owned by the State Highway Agency.