US Bridges

Mill Street over Mill Tail Race

Fair

Cheshire County, New Hampshire · .25 MI JCT Nh 12 · Structure no. 025801010008800

Built
1936
89 years old, rebuilt 2023
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
27 ft
1 main span
Daily traffic
96
2023 count
Owner
State
State Highway Agency

About this bridge

Mill Street over Mill Tail Race is a concrete slab carrying Mill Street over Mill Tail Race in Cheshire County, New Hampshire. It was built in 1936 and reconstructed in 2023, 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 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 96 vehicles a day, roughly 4% of them trucks, projected to reach 142 by 2043. The structure is 27 ft (8.2 m) long and 29 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesMill Street
CrossesMill Tail Race
Location.25 MI JCT Nh 12
Coordinates42.82709, -72.17839
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
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
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 evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length27 ft (8.2 m)
Longest span24 ft (7.3 m)
Deck width29 ft (8.8 m)
Roadway width25 ft (7.7 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 and pedestrian
CrossesWaterway
Detour if closed9.9 mi (16 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 Mill Street over Mill Tail Race built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 2023.

What condition is Mill Street over Mill Tail Race 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 Mill Street over Mill Tail Race carry?

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

How long is Mill Street over Mill Tail Race?

The structure is 27 ft (8.2 m) long with a longest span of 24 ft (7.3 m) and a deck 29 ft wide.

Who owns Mill Street over Mill Tail Race?

It is owned by the State Highway Agency.