US Bridges

Ruddsboro Road over Mink Brook

Good

Grafton County, New Hampshire · 4.2 MI FR Lebanon Tl · Structure no. 011401180008000

Built
1940
85 years old, rebuilt 2022
Condition
Good
inspected August 2023
Type
Slab
Concrete
Length
47 ft
1 main span
Daily traffic
96
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Ruddsboro Road over Mink Brook is a concrete slab carrying Ruddsboro Road over Mink Brook in Grafton County, New Hampshire. It was built in 1940 and reconstructed in 2022, so it is 85 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 good condition with a lowest component rating of 9 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 47 ft (14.2 m) long and 25 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesRuddsboro Road
CrossesMink Brook
Location4.2 MI FR Lebanon Tl
CountyGrafton County
StateNew Hampshire
Coordinates43.69981, -72.20676
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
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.8 US tons
Inventory rating45.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length47 ft (14.2 m)
Longest span43 ft (13 m)
Deck width25 ft (7.6 m)
Roadway width22 ft (6.7 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 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 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 Ruddsboro Road over Mink Brook built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 2022.

What condition is Ruddsboro Road over Mink 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 2023.

How much traffic does Ruddsboro Road over Mink Brook carry?

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

How long is Ruddsboro Road over Mink Brook?

The structure is 47 ft (14.2 m) long with a longest span of 43 ft (13 m) and a deck 25 ft wide.

Who owns Ruddsboro Road over Mink Brook?

It is owned by the City or Municipal Highway Agency.