US Bridges

SR 4008 over Silver Creek

PoorPosted for load

Susquehanna County, Pennsylvania · Franklin Twp .2M W TR 29 · Structure no. 000000000032657

Built
1934
91 years old, rebuilt 1958
Condition
Poor
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
24 ft
1 main span
Daily traffic
344
2024 count
Owner
State
State Highway Agency

About this bridge

SR 4008 over Silver Creek is a steel stringer/multi-beam or girder carrying SR 4008 over Silver Creek in Susquehanna County, Pennsylvania. It was built in 1934 and reconstructed in 1958, so it is 91 years old, older than the Pennsylvania average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 344 vehicles a day, roughly 17% of them trucks, projected to reach 479 by 2032. The structure is 24 ft (7.3 m) long and 25 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

CarriesSR 4008
CrossesSilver Creek
LocationFranklin Twp .2M W TR 29
RouteState Highway 0
Coordinates41.91743, -75.85108
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating25 US tons
Inventory rating15 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span23 ft (7 m)
Deck width25 ft (7.5 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic344 (2024)
Projected traffic479 by 2032
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$219,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 4008 over Silver Creek built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1958.

What condition is SR 4008 over Silver Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does SR 4008 over Silver Creek carry?

About 344 vehicles per day (2024 count), of which roughly 17% are trucks.

How long is SR 4008 over Silver Creek?

The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 25 ft wide.

Who owns SR 4008 over Silver Creek?

It is owned by the State Highway Agency.