US Bridges

Nh 12 over Mill Pond

Fair

Cheshire County, New Hampshire · 1.37 Mi. Fitzwilliam Tl · Structure no. 025800980008600

Built
1928
97 years old, rebuilt 1968
Condition
Fair
inspected June 2023
Type
Arch - Deck
Masonry
Length
56 ft
1 main span
Daily traffic
8,066
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 12 over Mill Pond is a masonry arch - deck carrying Nh 12 over Mill Pond in Cheshire County, New Hampshire. It was built in 1928 and reconstructed in 1968, so it is 97 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 8,066 vehicles a day, roughly 7% of them trucks, projected to reach 11,937 by 2043. The structure is 56 ft (17.1 m) long and 39 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesNh 12
CrossesMill Pond
Location1.37 Mi. Fitzwilliam Tl
RouteState Highway 12
CountyCheshire County
StateNew Hampshire
Coordinates42.82483, -72.18229
Functional classRural Principal Arterial - Other

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31 US tons
Inventory rating19 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length56 ft (17.1 m)
Longest span16 ft (4.9 m)
Deck width39 ft (11.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,066 (2023)
Projected traffic11,937 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemYes

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 Nh 12 over Mill Pond built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1968.

What condition is Nh 12 over Mill Pond 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 June 2023.

How much traffic does Nh 12 over Mill Pond carry?

About 8,066 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 12 over Mill Pond?

The structure is 56 ft (17.1 m) long with a longest span of 16 ft (4.9 m) and a deck 39 ft wide.

Who owns Nh 12 over Mill Pond?

It is owned by the State Highway Agency.