US Bridges

County Route 635 over Mulhockaway Creek

Fair

Hunterdon County, New Jersey · 1 Mi. N. of I-78 · Structure no. 1000030

Built
1900
125 years old, rebuilt 1983
Condition
Fair
inspected March 2023
Type
Slab
Prestressed Concrete
Length
42 ft
1 main span
Daily traffic
5,497
2023 count
Owner
County
County Highway Agency

About this bridge

County Route 635 over Mulhockaway Creek is a prestressed concrete slab carrying County Route 635 over Mulhockaway Creek in Hunterdon County, New Jersey. It was built in 1900 and reconstructed in 1983, so it is 125 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 5,497 vehicles a day, roughly 3% of them trucks, projected to reach 6,707 by 2043. The structure is 42 ft (12.8 m) long and 29 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCounty Route 635
CrossesMulhockaway Creek
Location1 Mi. N. of I-78
RouteCounty Highway 635
CountyHunterdon County
StateNew Jersey
Coordinates40.64747, -74.96878
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating110.1 US tons
Inventory rating61 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length42 ft (12.8 m)
Longest span39 ft (11.9 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,497 (2023)
Projected traffic6,707 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Route 635 over Mulhockaway Creek built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1983.

What condition is County Route 635 over Mulhockaway Creek 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 635 over Mulhockaway Creek carry?

About 5,497 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is County Route 635 over Mulhockaway Creek?

The structure is 42 ft (12.8 m) long with a longest span of 39 ft (11.9 m) and a deck 29 ft wide.

Who owns County Route 635 over Mulhockaway Creek?

It is owned by the County Highway Agency.