US Bridges

Ruddsboro Road over Mink Brook

Fair

Grafton County, New Hampshire · 4.4 MI FR Lebanon Tl · Structure no. 011401150007800

Built
1946
79 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
42 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 steel stringer/multi-beam or girder carrying Ruddsboro Road over Mink Brook in Grafton County, New Hampshire. It was built in 1946, so it is 79 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 96 vehicles a day, roughly 4% of them trucks, projected to reach 142 by 2043. The structure is 42 ft (12.8 m) long and 22 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesRuddsboro Road
CrossesMink Brook
Location4.4 MI FR Lebanon Tl
CountyGrafton County
StateNew Hampshire
Coordinates43.69928, -72.21037
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
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 alignment8: Equal to present desirable criteria
Operating rating27.7 US tons
Inventory rating16.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length42 ft (12.8 m)
Longest span39 ft (11.9 m)
Deck width22 ft (6.8 m)
Roadway width18 ft (5.6 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 1946, making it 79 years old in 2025.

What condition is Ruddsboro Road over Mink 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 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 42 ft (12.8 m) long with a longest span of 39 ft (11.9 m) and a deck 22 ft wide.

Who owns Ruddsboro Road over Mink Brook?

It is owned by the City or Municipal Highway Agency.