US Bridges

NH109 over Melvin River

Fair

Carroll County, New Hampshire · 6.5 MI from Wolfeboro Tl · Structure no. 025901450007000

Built
1921
104 years old, rebuilt 1992
Condition
Fair
inspected May 2024
Type
Slab
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
2,151
2023 count
Owner
State
State Highway Agency

About this bridge

NH109 over Melvin River is a prestressed concrete slab carrying NH109 over Melvin River in Carroll County, New Hampshire. It was built in 1921 and reconstructed in 1992, so it is 104 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 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 2,151 vehicles a day, roughly 4% of them trucks, projected to reach 3,183 by 2043. The structure is 30 ft (9.1 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesNH109
CrossesMelvin River
Location6.5 MI from Wolfeboro Tl
RouteState Highway 109
CountyCarroll County
StateNew Hampshire
Coordinates43.68897, -71.30331
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating93 US tons
Inventory rating55 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length30 ft (9.1 m)
Longest span24 ft (7.3 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,151 (2023)
Projected traffic3,183 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 Melvin River built?

It was built in 1921, making it 104 years old in 2025. It was reconstructed in 1992.

What condition is NH109 over Melvin River 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 Melvin River carry?

About 2,151 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH109 over Melvin River?

The structure is 30 ft (9.1 m) long with a longest span of 24 ft (7.3 m) and a deck 31 ft wide.

Who owns NH109 over Melvin River?

It is owned by the State Highway Agency.