US Bridges

Mill Street over Ammonoosuc Rail Trail

Good

Grafton County, New Hampshire · 0.15 MI FR Mont Bello ST · Structure no. 011702150015800

Built
2018
7 years old
Condition
Good
inspected October 2023
Type
Culvert
Concrete
Length
34 ft
1 main span
Daily traffic
156
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Mill Street over Ammonoosuc Rail Trail is a concrete culvert carrying Mill Street over Ammonoosuc Rail Trail in Grafton County, New Hampshire. It was built in 2018, so it is 7 years old, younger than the New Hampshire average of 56.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 156 vehicles a day, roughly 4% of them trucks, projected to reach 230 by 2043. The structure is 34 ft (10.5 m) long.

CarriesMill Street
CrossesAmmonoosuc Rail Trail
Location0.15 MI FR Mont Bello ST
Coordinates44.14562, -72.02403
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Culvert8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating65.3 US tons
Inventory rating50.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHL 93
Structure length34 ft (10.5 m)
Longest span30 ft (9.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic156 (2023)
Projected traffic230 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesPedestrian / bicycle
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$314,000 (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mill Street over Ammonoosuc Rail Trail built?

It was built in 2018, making it 7 years old in 2025.

What condition is Mill Street over Ammonoosuc Rail Trail in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does Mill Street over Ammonoosuc Rail Trail carry?

About 156 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Mill Street over Ammonoosuc Rail Trail?

The structure is 34 ft (10.5 m) long with a longest span of 30 ft (9.1 m).

Who owns Mill Street over Ammonoosuc Rail Trail?

It is owned by the City or Municipal Highway Agency.