US Bridges

US 3 Cd Road over Spit Brook Road

Fair

Hillsborough County, New Hampshire · 0.5 MI North Mass Sl · Structure no. 017701470003700

Built
1993
32 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
149 ft
1 main span
Daily traffic
4,911
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

US 3 Cd Road over Spit Brook Road is a steel stringer/multi-beam or girder carrying US 3 Cd Road over Spit Brook Road in Hillsborough County, New Hampshire. It was built in 1993, so it is 32 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 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 4,911 vehicles a day, projected to reach 7,268 by 2043. The structure is 149 ft (45.4 m) long and 40 ft wide.

Location

Open in Google Maps
CarriesUS 3 Cd Road
CrossesSpit Brook Road
Location0.5 MI North Mass Sl
RouteU.S. Route 3
CountyHillsborough County
StateNew Hampshire
Coordinates42.70811, -71.45021
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.4 US tons
Inventory rating51.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length149 ft (45.4 m)
Longest span144 ft (43.9 m)
Deck width40 ft (12.3 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,911 (2023)
Projected traffic7,268 by 2043
Trucks0%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a toll road
National Highway SystemYes

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
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 US 3 Cd Road over Spit Brook Road built?

It was built in 1993, making it 32 years old in 2025.

What condition is US 3 Cd Road over Spit Brook Road 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 April 2024.

How much traffic does US 3 Cd Road over Spit Brook Road carry?

About 4,911 vehicles per day (2023 count).

How long is US 3 Cd Road over Spit Brook Road?

The structure is 149 ft (45.4 m) long with a longest span of 144 ft (43.9 m) and a deck 40 ft wide.

Who owns US 3 Cd Road over Spit Brook Road?

It is owned by the State Toll Authority.