US Bridges

Spur Road over Stratford Bog Brook

Good

Coos County, New Hampshire · 0.4 MI N JCT US 3 · Structure no. 024401070007400

Built
1984
41 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
54 ft
1 main span
Daily traffic
117
2023 count
Owner
State
State Highway Agency

About this bridge

Spur Road over Stratford Bog Brook is a steel stringer/multi-beam or girder carrying Spur Road over Stratford Bog Brook in Coos County, New Hampshire. It was built in 1984, so it is 41 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 117 vehicles a day, roughly 4% of them trucks, projected to reach 173 by 2043. The structure is 54 ft (16.5 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSpur Road
CrossesStratford Bog Brook
Location0.4 MI N JCT US 3
RouteState Highway 0
CountyCoos County
StateNew Hampshire
Coordinates44.65834, -71.55341
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating64.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length54 ft (16.5 m)
Longest span48 ft (14.6 m)
Deck width32 ft (9.9 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic117 (2023)
Projected traffic173 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Spur Road over Stratford Bog Brook built?

It was built in 1984, making it 41 years old in 2025.

What condition is Spur Road over Stratford Bog 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 April 2024.

How much traffic does Spur Road over Stratford Bog Brook carry?

About 117 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Spur Road over Stratford Bog Brook?

The structure is 54 ft (16.5 m) long with a longest span of 48 ft (14.6 m) and a deck 32 ft wide.

Who owns Spur Road over Stratford Bog Brook?

It is owned by the State Highway Agency.