US Bridges

Lyons Road (cr 640 over Harrisons Brook

Fair

Somerset County, New Jersey · 0.35 Mile from Rt 525 · Structure no. 18G1201

Built
1930
95 years old, rebuilt 1982
Condition
Fair
inspected September 2023
Type
Slab
Wood or Timber
Length
26 ft
1 main span
Daily traffic
7,678
2023 count
Owner
County
County Highway Agency

About this bridge

Lyons Road (cr 640 over Harrisons Brook is a wood or timber slab carrying Lyons Road (cr 640 over Harrisons Brook in Somerset County, New Jersey. It was built in 1930 and reconstructed in 1982, so it is 95 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 7,678 vehicles a day, roughly 3% of them trucks, projected to reach 9,369 by 2043. The structure is 26 ft (7.9 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLyons Road (cr 640
CrossesHarrisons Brook
Location0.35 Mile from Rt 525
RouteCounty Highway 640
CountySomerset County
StateNew Jersey
Coordinates40.67436, -74.57006
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
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 inspectionSeptember 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating38 US tons
Inventory rating24 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span23 ft (7 m)
Deck width34 ft (10.5 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,678 (2023)
Projected traffic9,369 by 2043
Trucks3%
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Lyons Road (cr 640 over Harrisons Brook built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1982.

What condition is Lyons Road (cr 640 over Harrisons 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 September 2023.

How much traffic does Lyons Road (cr 640 over Harrisons Brook carry?

About 7,678 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Lyons Road (cr 640 over Harrisons Brook?

The structure is 26 ft (7.9 m) long with a longest span of 23 ft (7 m) and a deck 34 ft wide.

Who owns Lyons Road (cr 640 over Harrisons Brook?

It is owned by the County Highway Agency.