US Bridges

Tarbox Lane over Eastman Brook

Good

Grafton County, New Hampshire · 0.02 MI FR Nh RTE 25C · Structure no. 020900840009500

Built
1999
26 years old
Condition
Good
inspected September 2023
Type
Arch - Deck
Prestressed Concrete
Length
42 ft
1 main span
Daily traffic
96
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Tarbox Lane over Eastman Brook is a prestressed concrete arch - deck carrying Tarbox Lane over Eastman Brook in Grafton County, New Hampshire. It was built in 1999, so it is 26 years old, younger than the New Hampshire average of 56.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 96 vehicles a day, projected to reach 142 by 2043. The structure is 42 ft (12.8 m) long and 13 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesTarbox Lane
CrossesEastman Brook
Location0.02 MI FR Nh RTE 25C
CountyGrafton County
StateNew Hampshire
Coordinates43.97096, -72.06377
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating46.5 US tons
Inventory rating27.8 US tons

Structure

Structure typeArch - Deck
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length42 ft (12.8 m)
Longest span42 ft (12.8 m)
Deck width13 ft (4 m)
Roadway width10 ft (3.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic96 (2023)
Projected traffic142 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$314,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Tarbox Lane over Eastman Brook built?

It was built in 1999, making it 26 years old in 2025.

What condition is Tarbox Lane over Eastman Brook in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does Tarbox Lane over Eastman Brook carry?

About 96 vehicles per day (2023 count).

How long is Tarbox Lane over Eastman Brook?

The structure is 42 ft (12.8 m) long with a longest span of 42 ft (12.8 m) and a deck 13 ft wide.

Who owns Tarbox Lane over Eastman Brook?

It is owned by the City or Municipal Highway Agency.