US Bridges

Main St. (cr 512) over South Branch Raritan Rvr

Fair

Hunterdon County, New Jersey · 0.53 MI SE of CR 513 · Structure no. 100J001

Built
1887
138 years old, rebuilt 1987
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
100 ft
1 main span
Daily traffic
3,356
2023 count
Owner
County
County Highway Agency

About this bridge

Main St. (cr 512) over South Branch Raritan Rvr is a steel stringer/multi-beam or girder carrying Main St. (cr 512) over South Branch Raritan Rvr in Hunterdon County, New Jersey. It was built in 1887 and reconstructed in 1987, so it is 138 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 6 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 3,356 vehicles a day, roughly 3% of them trucks, projected to reach 4,095 by 2043. The structure is 100 ft (30.5 m) long and 26 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesMain St. (cr 512)
CrossesSouth Branch Raritan Rvr
Location0.53 MI SE of CR 513
RouteCounty Highway 512
CountyHunterdon County
StateNew Jersey
Coordinates40.7205, -74.83768
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating110.1 US tons
Inventory rating88 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20 + Mod
Structure length100 ft (30.5 m)
Longest span95 ft (29 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck15 ft (4.5 m)

Traffic and service

Average daily traffic3,356 (2023)
Projected traffic4,095 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 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$4,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Main St. (cr 512) over South Branch Raritan Rvr built?

It was built in 1887, making it 138 years old in 2025. It was reconstructed in 1987.

What condition is Main St. (cr 512) over South Branch Raritan Rvr 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 April 2023.

How much traffic does Main St. (cr 512) over South Branch Raritan Rvr carry?

About 3,356 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Main St. (cr 512) over South Branch Raritan Rvr?

The structure is 100 ft (30.5 m) long with a longest span of 95 ft (29 m) and a deck 26 ft wide.

Who owns Main St. (cr 512) over South Branch Raritan Rvr?

It is owned by the County Highway Agency.