US Bridges

US 3 over Bagley Brook

Fair

Grafton County, New Hampshire · 3.5 MI from Campton Tl · Structure no. 025401880007000

Built
1933
92 years old, rebuilt 1985
Condition
Fair
inspected August 2023
Type
Slab
Concrete
Length
27 ft
1 main span
Daily traffic
1,291
2023 count
Owner
State
State Highway Agency

About this bridge

US 3 over Bagley Brook is a concrete slab carrying US 3 over Bagley Brook in Grafton County, New Hampshire. It was built in 1933 and reconstructed in 1985, so it is 92 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 1,291 vehicles a day, roughly 4% of them trucks, projected to reach 1,910 by 2043. The structure is 27 ft (8.2 m) long and 34 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesUS 3
CrossesBagley Brook
Location3.5 MI from Campton Tl
RouteU.S. Route 3
CountyGrafton County
StateNew Hampshire
Coordinates43.90675, -71.68354
Functional classRural Major Collector

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating52 US tons
Inventory rating30 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length27 ft (8.2 m)
Longest span25 ft (7.6 m)
Deck width34 ft (10.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,291 (2023)
Projected traffic1,910 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 US 3 over Bagley Brook built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1985.

What condition is US 3 over Bagley Brook 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 US 3 over Bagley Brook carry?

About 1,291 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is US 3 over Bagley Brook?

The structure is 27 ft (8.2 m) long with a longest span of 25 ft (7.6 m) and a deck 34 ft wide.

Who owns US 3 over Bagley Brook?

It is owned by the State Highway Agency.