US Bridges

Mill Road over Rockaway Creek

Good

Hunterdon County, New Jersey · 0.5 Mile North of US 22 · Structure no. 100R024

Built
1900
125 years old, rebuilt 2023
Condition
Good
inspected June 2023
Type
Truss - Thru
Steel
Length
70 ft
2 main spans
Daily traffic
1,363
2023 count
Owner
County
County Highway Agency

About this bridge

Mill Road over Rockaway Creek is a steel truss - thru carrying Mill Road over Rockaway Creek in Hunterdon County, New Jersey. It was built in 1900 and reconstructed in 2023, 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,363 vehicles a day, projected to reach 1,663 by 2043. The structure is 70 ft (21.3 m) long and 17 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMill Road
CrossesRockaway Creek
Location0.5 Mile North of US 22
RouteCity Street 0
CountyHunterdon County
StateNew Jersey
Coordinates40.62532, -74.75645
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
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 statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating53 US tons
Inventory rating32 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckCorrugated steel
Main spans2
Design loadHS 20
Structure length70 ft (21.3 m)
Longest span36 ft (11 m)
Deck width17 ft (5.1 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,363 (2023)
Projected traffic1,663 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
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 statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mill Road over Rockaway Creek built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 2023.

What condition is Mill Road over Rockaway Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does Mill Road over Rockaway Creek carry?

About 1,363 vehicles per day (2023 count).

How long is Mill Road over Rockaway Creek?

The structure is 70 ft (21.3 m) long with a longest span of 36 ft (11 m) and a deck 17 ft wide.

Who owns Mill Road over Rockaway Creek?

It is owned by the County Highway Agency.