US Bridges

Griggstown Causewa over D&r Canal

Fair

Somerset County, New Jersey · 0.23 MI E of CR 533 JCT · Structure no. 3000163

Built
1950
75 years old, rebuilt 1990
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
47 ft
3 main spans
Daily traffic
6,266
2024 count
Owner
State
Other State Agency

About this bridge

Griggstown Causewa over D&r Canal is a wood or timber stringer/multi-beam or girder carrying Griggstown Causewa over D&r Canal in Somerset County, New Jersey. It was built in 1950 and reconstructed in 1990, 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 6,266 vehicles a day, roughly 3% of them trucks, projected to reach 7,646 by 2044. The structure is 47 ft (14.3 m) long and 42 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesGriggstown Causewa
CrossesD&r Canal
Location0.23 MI E of CR 533 JCT
RouteCounty Highway 632
CountySomerset County
StateNew Jersey
Coordinates40.43813, -74.61401
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating29.1 US tons
Inventory rating20.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20
Structure length47 ft (14.3 m)
Longest span15 ft (4.6 m)
Deck width42 ft (12.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,266 (2024)
Projected traffic7,646 by 2044
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther State Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Griggstown Causewa over D&r Canal built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1990.

What condition is Griggstown Causewa over D&r Canal 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 2024.

How much traffic does Griggstown Causewa over D&r Canal carry?

About 6,266 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is Griggstown Causewa over D&r Canal?

The structure is 47 ft (14.3 m) long with a longest span of 15 ft (4.6 m) and a deck 42 ft wide.

Who owns Griggstown Causewa over D&r Canal?

It is owned by the Other State Agency and maintained by the State Highway Agency.