US Bridges

Canal Street over Nashua River

Fair

Hillsborough County, New Hampshire · 0.6 MI from Route 3 · Structure no. 017701390011500

Built
1928
97 years old
Condition
Fair
inspected August 2023
Type
Arch - Deck
Concrete
Length
160 ft
2 main spans
Daily traffic
14,902
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Canal Street over Nashua River is a concrete arch - deck carrying Canal Street over Nashua River in Hillsborough County, New Hampshire. It was built in 1928, 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 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 14,902 vehicles a day, roughly 5% of them trucks, projected to reach 22,054 by 2043. The structure is 160 ft (48.8 m) long and 54 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesCanal Street
CrossesNashua River
Location0.6 MI from Route 3
RouteCity Street 0
Coordinates42.76369, -71.45473
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.3 US tons
Inventory rating26.3 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length160 ft (48.8 m)
Longest span76 ft (23.2 m)
Deck width54 ft (16.5 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,902 (2023)
Projected traffic22,054 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusEligible 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)
NavigationNo navigation control on waterway

Frequently asked questions

When was Canal Street over Nashua River built?

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

What condition is Canal Street over Nashua River 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 August 2023.

How much traffic does Canal Street over Nashua River carry?

About 14,902 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Canal Street over Nashua River?

The structure is 160 ft (48.8 m) long with a longest span of 76 ft (23.2 m) and a deck 54 ft wide.

Who owns Canal Street over Nashua River?

It is owned by the City or Municipal Highway Agency.