US Bridges

Nh 63 over Mill Brook

Fair

Cheshire County, New Hampshire · 1.3 MI from JCT RTE 12 · Structure no. 027201090012400

Built
1930
95 years old, rebuilt 1986
Condition
Fair
inspected June 2024
Type
Arch - Deck
Concrete
Length
30 ft
1 main span
Daily traffic
1,044
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 63 over Mill Brook is a concrete arch - deck carrying Nh 63 over Mill Brook in Cheshire County, New Hampshire. It was built in 1930 and reconstructed in 1986, so it is 95 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 1,044 vehicles a day, roughly 4% of them trucks, projected to reach 1,545 by 2043. The structure is 30 ft (9.1 m) long and 32 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesNh 63
CrossesMill Brook
Location1.3 MI from JCT RTE 12
RouteState Highway 63
CountyCheshire County
StateNew Hampshire
Coordinates42.99159, -72.44543
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2024
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating30.8 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,044 (2023)
Projected traffic1,545 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Nh 63 over Mill Brook built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1986.

What condition is Nh 63 over Mill 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 June 2024.

How much traffic does Nh 63 over Mill Brook carry?

About 1,044 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Nh 63 over Mill Brook?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns Nh 63 over Mill Brook?

It is owned by the State Highway Agency.