US Bridges

Buck RD Old NH120 over Mink Brook

Fair

Grafton County, New Hampshire · Buck RD @ Mink Brook · Structure no. 011400610004600

Built
1936
89 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
68 ft
1 main span
Daily traffic
—
2005 count
Owner
City
City or Municipal Highway Agency

About this bridge

Buck RD Old NH120 over Mink Brook is a steel stringer/multi-beam or girder carrying Buck RD Old NH120 over Mink Brook in Grafton County, New Hampshire. It was built in 1936, so it is 89 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.

No traffic count is recorded. The structure is 68 ft (20.7 m) long and 24 ft wide. If it were closed, the detour would be 62.1 mi (100 km).

Location

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CarriesBuck RD Old NH120
CrossesMink Brook
LocationBuck RD @ Mink Brook
CountyGrafton County
StateNew Hampshire
Coordinates43.69187, -72.27076
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating57.2 US tons
Inventory rating34.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 10
Structure length68 ft (20.7 m)
Longest span61 ft (18.6 m)
Deck width24 ft (7.3 m)
Roadway width21 ft (6.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic—
Projected traffic—
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed62.1 mi (100 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 Buck RD Old NH120 over Mink Brook built?

It was built in 1936, making it 89 years old in 2025.

What condition is Buck RD Old NH120 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 Buck RD Old NH120 over Mink Brook carry?

No traffic count is recorded for this structure.

How long is Buck RD Old NH120 over Mink Brook?

The structure is 68 ft (20.7 m) long with a longest span of 61 ft (18.6 m) and a deck 24 ft wide.

Who owns Buck RD Old NH120 over Mink Brook?

It is owned by the City or Municipal Highway Agency.