US Bridges

NH109 over Willey Brook

Fair

Carroll County, New Hampshire · 0.8 MI Wentworth Stateprk · Structure no. 028301670009500

Built
1922
103 years old, rebuilt 1971
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
27 ft
1 main span
Daily traffic
2,283
2023 count
Owner
State
State Highway Agency

About this bridge

NH109 over Willey Brook is a steel stringer/multi-beam or girder carrying NH109 over Willey Brook in Carroll County, New Hampshire. It was built in 1922 and reconstructed in 1971, so it is 103 years old, older than the New Hampshire average of 56.9 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 2,283 vehicles a day, roughly 4% of them trucks, projected to reach 3,378 by 2043. The structure is 27 ft (8.2 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesNH109
CrossesWilley Brook
Location0.8 MI Wentworth Stateprk
RouteState Highway 109
CountyCarroll County
StateNew Hampshire
Coordinates43.61628, -71.16169
Functional classRural Major 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating25.2 US tons
Inventory rating18 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length27 ft (8.2 m)
Longest span25 ft (7.6 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,283 (2023)
Projected traffic3,378 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

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
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 NH109 over Willey Brook built?

It was built in 1922, making it 103 years old in 2025. It was reconstructed in 1971.

What condition is NH109 over Willey 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 May 2024.

How much traffic does NH109 over Willey Brook carry?

About 2,283 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH109 over Willey Brook?

The structure is 27 ft (8.2 m) long with a longest span of 25 ft (7.6 m) and a deck 33 ft wide.

Who owns NH109 over Willey Brook?

It is owned by the State Highway Agency.