US Bridges

Philo Boulevard over Mill Brook

Fair

Middlesex County, New Jersey · 350 NE of I95/CR531 · Structure no. 121B109

Built
1950
75 years old
Condition
Fair
inspected March 2023
Type
Culvert
Concrete
Length
24 ft
2 main spans
Daily traffic
357
2023 count
Owner
County
County Highway Agency

About this bridge

Philo Boulevard over Mill Brook is a concrete culvert carrying Philo Boulevard over Mill Brook in Middlesex County, New Jersey. It was built in 1950, so it is 75 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 357 vehicles a day, roughly 1% of them trucks, projected to reach 435 by 2043. The structure is 24 ft (7.3 m) long and 51 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesPhilo Boulevard
CrossesMill Brook
Location350 NE of I95/CR531
RouteCity Street 0
CountyMiddlesex County
StateNew Jersey
Coordinates40.52101, -74.35611
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating34 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span12 ft (3.7 m)
Deck width51 ft (15.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic357 (2023)
Projected traffic435 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Philo Boulevard over Mill Brook built?

It was built in 1950, making it 75 years old in 2025.

What condition is Philo Boulevard over Mill Brook 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 Philo Boulevard over Mill Brook carry?

About 357 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Philo Boulevard over Mill Brook?

The structure is 24 ft (7.3 m) long with a longest span of 12 ft (3.7 m) and a deck 51 ft wide.

Who owns Philo Boulevard over Mill Brook?

It is owned by the County Highway Agency.