US Bridges

Knowlton RD(CR616) over I-80

Fair

Warren County, New Jersey · 4.24MI N of US 46 · Structure no. 2115161

Built
1972
53 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
286 ft
3 main spans
Daily traffic
1,594
2023 count
Owner
State
State Highway Agency

About this bridge

Knowlton RD(CR616) over I-80 is a steel stringer/multi-beam or girder carrying Knowlton RD(CR616) over I-80 in Warren County, New Jersey. It was built in 1972, so it is 53 years old, younger 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 1,594 vehicles a day, roughly 3% of them trucks, projected to reach 1,945 by 2043. The structure is 286 ft (87.2 m) long and 40 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesKnowlton RD(CR616)
CrossesI-80
Location4.24MI N of US 46
RouteCity Street 616
CountyWarren County
StateNew Jersey
Coordinates40.93261, -75.02626
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length286 ft (87.2 m)
Longest span110 ft (33.5 m)
Deck width40 ft (12.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,594 (2023)
Projected traffic1,945 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Knowlton RD(CR616) over I-80 built?

It was built in 1972, making it 53 years old in 2025.

What condition is Knowlton RD(CR616) over I-80 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 Knowlton RD(CR616) over I-80 carry?

About 1,594 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Knowlton RD(CR616) over I-80?

The structure is 286 ft (87.2 m) long with a longest span of 110 ft (33.5 m) and a deck 40 ft wide.

Who owns Knowlton RD(CR616) over I-80?

It is owned by the State Highway Agency.