US Bridges

Indian Lane over Frog Hollow Brook

Fair

Hunterdon County, New Jersey · .75 MI N of CR 512 · Structure no. 100T127

Built
1985
40 years old
Condition
Fair
inspected March 2023
Type
Slab
Wood or Timber
Length
24 ft
1 main span
Daily traffic
74
2023 count
Owner
County
County Highway Agency

About this bridge

Indian Lane over Frog Hollow Brook is a wood or timber slab carrying Indian Lane over Frog Hollow Brook in Hunterdon County, New Jersey. It was built in 1985, so it is 40 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 74 vehicles a day, roughly 3% of them trucks, projected to reach 89 by 2043. The structure is 24 ft (7.3 m) long and 33 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesIndian Lane
CrossesFrog Hollow Brook
Location.75 MI N of CR 512
CountyHunterdon County
StateNew Jersey
Coordinates40.72369, -74.82929
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 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 geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating73 US tons
Inventory rating52 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20 + Mod
Structure length24 ft (7.3 m)
Longest span20 ft (6.1 m)
Deck width33 ft (10.1 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic74 (2023)
Projected traffic89 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Indian Lane over Frog Hollow Brook built?

It was built in 1985, making it 40 years old in 2025.

What condition is Indian Lane over Frog Hollow 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 Indian Lane over Frog Hollow Brook carry?

About 74 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Indian Lane over Frog Hollow Brook?

The structure is 24 ft (7.3 m) long with a longest span of 20 ft (6.1 m) and a deck 33 ft wide.

Who owns Indian Lane over Frog Hollow Brook?

It is owned by the County Highway Agency.