US Bridges

Stephens Mill Road over South Br.Raritan River

Fair

Morris County, New Jersey · 1.7 MI W of Cty Rt 612 · Structure no. 1401127

Built
1978
47 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
31 ft
1 main span
Daily traffic
493
2023 count
Owner
County
County Highway Agency

About this bridge

Stephens Mill Road over South Br.Raritan River is a steel stringer/multi-beam or girder carrying Stephens Mill Road over South Br.Raritan River in Morris County, New Jersey. It was built in 1978, so it is 47 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 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 493 vehicles a day, roughly 1% of them trucks, projected to reach 601 by 2043. The structure is 31 ft (9.4 m) long and 19 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesStephens Mill Road
CrossesSouth Br.Raritan River
Location1.7 MI W of Cty Rt 612
RouteCity Street 0
CountyMorris County
StateNew Jersey
Coordinates40.83781, -74.74533
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating110.1 US tons
Inventory rating69 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length31 ft (9.4 m)
Longest span30 ft (9.1 m)
Deck width19 ft (5.7 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic493 (2023)
Projected traffic601 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$329,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stephens Mill Road over South Br.Raritan River built?

It was built in 1978, making it 47 years old in 2025.

What condition is Stephens Mill Road over South Br.Raritan 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 July 2023.

How much traffic does Stephens Mill Road over South Br.Raritan River carry?

About 493 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Stephens Mill Road over South Br.Raritan River?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 19 ft wide.

Who owns Stephens Mill Road over South Br.Raritan River?

It is owned by the County Highway Agency.