US Bridges

Main STREET(CR527) over Raritan River

Fair

Somerset County, New Jersey · 0.73 MI S of Nj 28 · Structure no. 18H0706

Built
1875
150 years old, rebuilt 2006
Condition
Fair
inspected September 2023
Type
Girder and Floorbeam System
Steel
Length
413 ft
3 main spans
Daily traffic
13,656
2023 count
Owner
County
County Highway Agency

About this bridge

Main STREET(CR527) over Raritan River is a steel girder and floorbeam system carrying Main STREET(CR527) over Raritan River in Somerset County, New Jersey. It was built in 1875 and reconstructed in 2006, so it is 150 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.

It carries about 13,656 vehicles a day, roughly 4% of them trucks, projected to reach 16,663 by 2043. The structure is 413 ft (125.9 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMain STREET(CR527)
CrossesRaritan River
Location0.73 MI S of Nj 28
RouteCounty Highway 527
CountySomerset County
StateNew Jersey
Coordinates40.55897, -74.5279
Functional classUrban Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
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 protection7 GoodSome minor problems.
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating73 US tons
Inventory rating44 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckSteel plate
Main spans3
Design loadHS 25 or greater
Structure length413 ft (125.9 m)
Longest span134 ft (40.8 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck18 ft (5.4 m)

Traffic and service

Average daily traffic13,656 (2023)
Projected traffic16,663 by 2043
Trucks4%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$16.3 million (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Main STREET(CR527) over Raritan River built?

It was built in 1875, making it 150 years old in 2025. It was reconstructed in 2006.

What condition is Main STREET(CR527) over Raritan 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 September 2023.

How much traffic does Main STREET(CR527) over Raritan River carry?

About 13,656 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Main STREET(CR527) over Raritan River?

The structure is 413 ft (125.9 m) long with a longest span of 134 ft (40.8 m) and a deck 28 ft wide.

Who owns Main STREET(CR527) over Raritan River?

It is owned by the County Highway Agency.