US Bridges

Jackson Mills Road over Manasquan River

Fair

Monmouth County, New Jersey · 1 Mile West of US 9 · Structure no. 1300F51

Built
1929
96 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
34 ft
1 main span
Daily traffic
13,206
2023 count
Owner
County
County Highway Agency

About this bridge

Jackson Mills Road over Manasquan River is a steel stringer/multi-beam or girder carrying Jackson Mills Road over Manasquan River in Monmouth County, New Jersey. It was built in 1929, so it is 96 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 13,206 vehicles a day, roughly 3% of them trucks, projected to reach 16,113 by 2043. The structure is 34 ft (10.4 m) long and 30 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesJackson Mills Road
CrossesManasquan River
Location1 Mile West of US 9
RouteCounty Highway 23
Coordinates40.21028, -74.2775
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating58 US tons
Inventory rating35.1 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length34 ft (10.4 m)
Longest span29 ft (8.8 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,206 (2023)
Projected traffic16,113 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 statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.4 million (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Jackson Mills Road over Manasquan River built?

It was built in 1929, making it 96 years old in 2025.

What condition is Jackson Mills Road over Manasquan 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 April 2023.

How much traffic does Jackson Mills Road over Manasquan River carry?

About 13,206 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Jackson Mills Road over Manasquan River?

The structure is 34 ft (10.4 m) long with a longest span of 29 ft (8.8 m) and a deck 30 ft wide.

Who owns Jackson Mills Road over Manasquan River?

It is owned by the County Highway Agency.