US Bridges

College Road over Willey Brook

Good

Carroll County, New Hampshire · 0.42MI NH28 · Structure no. 028301760009900

Built
2002
23 years old
Condition
Good
inspected August 2024
Type
Slab
Prestressed Concrete
Length
29 ft
1 main span
Daily traffic
578
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

College Road over Willey Brook is a prestressed concrete slab carrying College Road over Willey Brook in Carroll County, New Hampshire. It was built in 2002, so it is 23 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 578 vehicles a day, roughly 4% of them trucks, projected to reach 855 by 2043. The structure is 29 ft (8.8 m) long and 29 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCollege Road
CrossesWilley Brook
Location0.42MI NH28
CountyCarroll County
StateNew Hampshire
Coordinates43.6231, -71.16043
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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum 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 rating110.1 US tons
Inventory rating76.5 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length29 ft (8.8 m)
Longest span27 ft (8.2 m)
Deck width29 ft (8.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic578 (2023)
Projected traffic855 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 College Road over Willey Brook built?

It was built in 2002, making it 23 years old in 2025.

What condition is College Road over Willey 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 August 2024.

How much traffic does College Road over Willey Brook carry?

About 578 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is College Road over Willey Brook?

The structure is 29 ft (8.8 m) long with a longest span of 27 ft (8.2 m) and a deck 29 ft wide.

Who owns College Road over Willey Brook?

It is owned by the City or Municipal Highway Agency.