US Bridges

Spring Street over Great Brook

Good

Grafton County, New Hampshire · 0.3 MI FR Nh Route 120 · Structure no. 014401210010800

Built
1953
72 years old, rebuilt 2004
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
42 ft
1 main span
Daily traffic
591
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Spring Street over Great Brook is a steel stringer/multi-beam or girder carrying Spring Street over Great Brook in Grafton County, New Hampshire. It was built in 1953 and reconstructed in 2004, so it is 72 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 591 vehicles a day, roughly 4% of them trucks, projected to reach 874 by 2043. The structure is 42 ft (12.9 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSpring Street
CrossesGreat Brook
Location0.3 MI FR Nh Route 120
Coordinates43.63674, -72.25281
Functional classUrban Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating81 US tons
Inventory rating48.6 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length42 ft (12.9 m)
Longest span38 ft (11.6 m)
Deck width32 ft (9.8 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic591 (2023)
Projected traffic874 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Spring Street over Great Brook built?

It was built in 1953, making it 72 years old in 2025. It was reconstructed in 2004.

What condition is Spring Street over Great Brook 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 July 2024.

How much traffic does Spring Street over Great Brook carry?

About 591 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Spring Street over Great Brook?

The structure is 42 ft (12.9 m) long with a longest span of 38 ft (11.6 m) and a deck 32 ft wide.

Who owns Spring Street over Great Brook?

It is owned by the City or Municipal Highway Agency.