US Bridges

Fairgrounds Road over West Branch Brook

Good

Merrimack County, New Hampshire · 0.03 MI FR Johnson Hill R · Structure no. 002801000014100

Built
2003
22 years old
Condition
Good
inspected September 2023
Type
Slab
Prestressed Concrete
Length
44 ft
1 main span
Daily traffic
96
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Fairgrounds Road over West Branch Brook is a prestressed concrete slab carrying Fairgrounds Road over West Branch Brook in Merrimack County, New Hampshire. It was built in 2003, so it is 22 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 8 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, roughly 4% of them trucks, projected to reach 142 by 2043. The structure is 44 ft (13.3 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesFairgrounds Road
CrossesWest Branch Brook
Location0.03 MI FR Johnson Hill R
CountyMerrimack County
StateNew Hampshire
Coordinates43.26234, -71.99311
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating76.6 US tons
Inventory rating45.9 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length44 ft (13.3 m)
Longest span41 ft (12.5 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic96 (2023)
Projected traffic142 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Fairgrounds Road over West Branch Brook built?

It was built in 2003, making it 22 years old in 2025.

What condition is Fairgrounds Road over West Branch 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 Fairgrounds Road over West Branch Brook carry?

About 96 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Fairgrounds Road over West Branch Brook?

The structure is 44 ft (13.3 m) long with a longest span of 41 ft (12.5 m) and a deck 29 ft wide.

Who owns Fairgrounds Road over West Branch Brook?

It is owned by the City or Municipal Highway Agency.