US Bridges

Northampton ST over Silver Creek

Fair

Northampton County, Pennsylvania · South of Water ST · Structure no. 000000000028927

Built
1920
105 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
22 ft
1 main span
Daily traffic
1,900
2009 count
Owner
City
City or Municipal Highway Agency

About this bridge

Northampton ST over Silver Creek is a steel stringer/multi-beam or girder carrying Northampton ST over Silver Creek in Northampton County, Pennsylvania. It was built in 1920, so it is 105 years old, older than the Pennsylvania average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,900 vehicles a day, roughly 2% of them trucks, projected to reach 3,307 by 2030. The structure is 22 ft (6.7 m) long and 57 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNorthampton ST
CrossesSilver Creek
LocationSouth of Water ST
RouteCity Street 0
CountyNorthampton County
StatePennsylvania
Coordinates40.57877, -75.33923
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87 US tons
Inventory rating52 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length22 ft (6.7 m)
Longest span21 ft (6.4 m)
Deck width57 ft (17.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,900 (2009)
Projected traffic3,307 by 2030
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Northampton ST over Silver Creek built?

It was built in 1920, making it 105 years old in 2025.

What condition is Northampton ST over Silver Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2023.

How much traffic does Northampton ST over Silver Creek carry?

About 1,900 vehicles per day (2009 count), of which roughly 2% are trucks.

How long is Northampton ST over Silver Creek?

The structure is 22 ft (6.7 m) long with a longest span of 21 ft (6.4 m) and a deck 57 ft wide.

Who owns Northampton ST over Silver Creek?

It is owned by the City or Municipal Highway Agency.