US Bridges

Harrison Avenue over Mill Brook

Fair

Middlesex County, New Jersey · 0.6 Mi. N. of RT.27 · Structure no. 122B301

Built
1990
35 years old
Condition
Fair
inspected March 2023
Type
Culvert
Concrete
Length
20 ft
1 main span
Daily traffic
2,020
2023 count
Owner
County
County Highway Agency

About this bridge

Harrison Avenue over Mill Brook is a concrete culvert carrying Harrison Avenue over Mill Brook in Middlesex County, New Jersey. It was built in 1990, so it is 35 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 6 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 2,020 vehicles a day, roughly 1% of them trucks, projected to reach 2,465 by 2043. The structure is 20 ft (6.1 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesHarrison Avenue
CrossesMill Brook
Location0.6 Mi. N. of RT.27
RouteCity Street 0
CountyMiddlesex County
StateNew Jersey
Coordinates40.50626, -74.43038
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.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20 + Mod
Structure length20 ft (6.1 m)
Longest span20 ft (6.1 m)
Deck width37 ft (11.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,020 (2023)
Projected traffic2,465 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 Harrison Avenue over Mill Brook built?

It was built in 1990, making it 35 years old in 2025.

What condition is Harrison Avenue 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 Harrison Avenue over Mill Brook carry?

About 2,020 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Harrison Avenue over Mill Brook?

The structure is 20 ft (6.1 m) long with a longest span of 20 ft (6.1 m) and a deck 37 ft wide.

Who owns Harrison Avenue over Mill Brook?

It is owned by the County Highway Agency.