US Bridges

Ironia RD over N.Branch Raritan River

PoorPosted for load

Morris County, New Jersey · 0.50 Mi. NW of JCT Nj 24 · Structure no. 1400722

Built
1952
73 years old
Condition
Poor
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
37 ft
1 main span
Daily traffic
1,869
2023 count
Owner
County
County Highway Agency

About this bridge

Ironia RD over N.Branch Raritan River is a steel stringer/multi-beam or girder carrying Ironia RD over N.Branch Raritan River in Morris County, New Jersey. It was built in 1952, so it is 73 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 1,869 vehicles a day, roughly 3% of them trucks, projected to reach 2,280 by 2043. The structure is 37 ft (11.3 m) long and 37 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesIronia RD
CrossesN.Branch Raritan River
Location0.50 Mi. NW of JCT Nj 24
Coordinates40.7778, -74.62174
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating29 US tons
Inventory rating17 US tons

Structure

MaterialSteel
DeckClosed grating
Main spans1
Design loadUnknown
Structure length37 ft (11.3 m)
Longest span31 ft (9.4 m)
Deck width37 ft (11.2 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,869 (2023)
Projected traffic2,280 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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$2.1 million (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Ironia RD over N.Branch Raritan River built?

It was built in 1952, making it 73 years old in 2025.

What condition is Ironia RD over N.Branch Raritan River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2023.

How much traffic does Ironia RD over N.Branch Raritan River carry?

About 1,869 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Ironia RD over N.Branch Raritan River?

The structure is 37 ft (11.3 m) long with a longest span of 31 ft (9.4 m) and a deck 37 ft wide.

Who owns Ironia RD over N.Branch Raritan River?

It is owned by the County Highway Agency.