US Bridges

School Street over Spruce Run

FairPosted for load

Hunterdon County, New Jersey · 0.1 Mile East of Nj 31 · Structure no. 10XXG63

Built
1870
155 years old, rebuilt 2021
Condition
Fair
inspected August 2023
Type
Truss - Thru
Aluminum, Wrought Iron, or Cast Iron
Length
84 ft
1 main span
Daily traffic
1,384
2023 count
Owner
County
County Highway Agency

About this bridge

School Street over Spruce Run is a aluminum, wrought iron, or cast iron truss - thru carrying School Street over Spruce Run in Hunterdon County, New Jersey. It was built in 1870 and reconstructed in 2021, so it is 155 years old, older than the New Jersey average of 58.5 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. Its operating status is: posted for load restriction.

It carries about 1,384 vehicles a day, projected to reach 1,660 by 2043. The structure is 84 ft (25.6 m) long and 17 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSchool Street
CrossesSpruce Run
Location0.1 Mile East of Nj 31
RouteCity Street 0
CountyHunterdon County
StateNew Jersey
Coordinates40.70118, -74.9436
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating26 US tons
Inventory rating17 US tons

Structure

Structure typeTruss - Thru
MaterialAluminum, Wrought Iron, or Cast Iron
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length84 ft (25.6 m)
Longest span80 ft (24.4 m)
Deck width17 ft (5.1 m)
Roadway width16 ft (5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,384 (2023)
Projected traffic1,660 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.6 million (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was School Street over Spruce Run built?

It was built in 1870, making it 155 years old in 2025. It was reconstructed in 2021.

What condition is School Street over Spruce Run 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 August 2023.

How much traffic does School Street over Spruce Run carry?

About 1,384 vehicles per day (2023 count).

How long is School Street over Spruce Run?

The structure is 84 ft (25.6 m) long with a longest span of 80 ft (24.4 m) and a deck 17 ft wide.

Who owns School Street over Spruce Run?

It is owned by the County Highway Agency.