US Bridges

SR 4018 over Unt to Susq. River

Fair

Northumberland County, Pennsylvania · 1 Mile South of Sunbury · Structure no. 000000000029295

Built
1922
103 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Concrete
Length
27 ft
1 main span
Daily traffic
3,150
2024 count
Owner
State
State Highway Agency

About this bridge

SR 4018 over Unt to Susq. River is a concrete tee beam carrying SR 4018 over Unt to Susq. River in Northumberland County, Pennsylvania. It was built in 1922, so it is 103 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 3,150 vehicles a day, roughly 5% of them trucks, projected to reach 5,466 by 2032. The structure is 27 ft (8.2 m) long and 23 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSR 4018
CrossesUnt to Susq. River
Location1 Mile South of Sunbury
RouteState Highway 0
CountyNorthumberland County
StatePennsylvania
Coordinates40.83362, -76.80833
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating75 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length27 ft (8.2 m)
Longest span26 ft (7.9 m)
Deck width23 ft (6.9 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,150 (2024)
Projected traffic5,466 by 2032
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$393,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 4018 over Unt to Susq. River built?

It was built in 1922, making it 103 years old in 2025.

What condition is SR 4018 over Unt to Susq. River 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 November 2023.

How much traffic does SR 4018 over Unt to Susq. River carry?

About 3,150 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is SR 4018 over Unt to Susq. River?

The structure is 27 ft (8.2 m) long with a longest span of 26 ft (7.9 m) and a deck 23 ft wide.

Who owns SR 4018 over Unt to Susq. River?

It is owned by the State Highway Agency.