US Bridges

Nh 10 over Mirey Brook

Fair

Cheshire County, New Hampshire · 0.2 MI from JCT RTE 78 · Structure no. 027901200007700

Built
1940
85 years old, rebuilt 1987
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
79 ft
3 main spans
Daily traffic
8,914
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 10 over Mirey Brook is a steel continuous stringer/multi-beam or girder carrying Nh 10 over Mirey Brook in Cheshire County, New Hampshire. It was built in 1940 and reconstructed in 1987, so it is 85 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 8,914 vehicles a day, roughly 7% of them trucks, projected to reach 13,192 by 2043. The structure is 79 ft (24.1 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesNh 10
CrossesMirey Brook
Location0.2 MI from JCT RTE 78
RouteState Highway 10
CountyCheshire County
StateNew Hampshire
Coordinates42.76876, -72.38796
Functional classRural Minor Arterial

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.9 US tons
Inventory rating34.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length79 ft (24.1 m)
Longest span32 ft (9.8 m)
Deck width35 ft (10.8 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,914 (2023)
Projected traffic13,192 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 10 over Mirey Brook built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1987.

What condition is Nh 10 over Mirey 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 May 2024.

How much traffic does Nh 10 over Mirey Brook carry?

About 8,914 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 10 over Mirey Brook?

The structure is 79 ft (24.1 m) long with a longest span of 32 ft (9.8 m) and a deck 35 ft wide.

Who owns Nh 10 over Mirey Brook?

It is owned by the State Highway Agency.