US Bridges

County Route 643 over Musconetcong River

Fair

Hunterdon County, New Jersey · 3 MI N. of US 22 & CR 614 · Structure no. 1000B8W

Built
1986
39 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
249 ft
2 main spans
Daily traffic
1,563
2023 count
Owner
County
County Highway Agency

About this bridge

County Route 643 over Musconetcong River is a steel stringer/multi-beam or girder carrying County Route 643 over Musconetcong River in Hunterdon County, New Jersey. It was built in 1986, so it is 39 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 1,563 vehicles a day, roughly 5% of them trucks, projected to reach 1,907 by 2043. The structure is 249 ft (75.9 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCounty Route 643
CrossesMusconetcong River
Location3 MI N. of US 22 & CR 614
RouteCounty Highway 643
CountyHunterdon County
StateNew Jersey
Coordinates40.69489, -75.00956
Functional classRural Minor 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating87 US tons
Inventory rating54 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20 + Mod
Structure length249 ft (75.9 m)
Longest span104 ft (31.7 m)
Deck width36 ft (10.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,563 (2023)
Projected traffic1,907 by 2043
Trucks5%
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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Route 643 over Musconetcong River built?

It was built in 1986, making it 39 years old in 2025.

What condition is County Route 643 over Musconetcong 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 March 2023.

How much traffic does County Route 643 over Musconetcong River carry?

About 1,563 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is County Route 643 over Musconetcong River?

The structure is 249 ft (75.9 m) long with a longest span of 104 ft (31.7 m) and a deck 36 ft wide.

Who owns County Route 643 over Musconetcong River?

It is owned by the County Highway Agency.