US Bridges

North Mason Road over Spaulding Brook

Good

Hillsborough County, New Hampshire · 1.7 MI from Mason Tl · Structure no. 003400630011500

Built
1988
37 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
47 ft
1 main span
Daily traffic
208
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

North Mason Road over Spaulding Brook is a steel stringer/multi-beam or girder carrying North Mason Road over Spaulding Brook in Hillsborough County, New Hampshire. It was built in 1988, so it is 37 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 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 208 vehicles a day, roughly 4% of them trucks, projected to reach 307 by 2043. The structure is 47 ft (14.3 m) long and 31 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesNorth Mason Road
CrossesSpaulding Brook
Location1.7 MI from Mason Tl
Coordinates42.76307, -71.68611
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating37 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length47 ft (14.3 m)
Longest span44 ft (13.4 m)
Deck width31 ft (9.4 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic208 (2023)
Projected traffic307 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
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)
NavigationNo navigation control on waterway

Frequently asked questions

When was North Mason Road over Spaulding Brook built?

It was built in 1988, making it 37 years old in 2025.

What condition is North Mason Road over Spaulding 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 August 2024.

How much traffic does North Mason Road over Spaulding Brook carry?

About 208 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is North Mason Road over Spaulding Brook?

The structure is 47 ft (14.3 m) long with a longest span of 44 ft (13.4 m) and a deck 31 ft wide.

Who owns North Mason Road over Spaulding Brook?

It is owned by the City or Municipal Highway Agency.