US Bridges

US302 over Deception Brook

Good

Coos County, New Hampshire · 3.6 MI E. JCT US3 · Structure no. 003901610012900

Built
1974
51 years old
Condition
Good
inspected March 2024
Type
Frame
Concrete
Length
34 ft
2 main spans
Daily traffic
3,842
2023 count
Owner
State
State Highway Agency

About this bridge

US302 over Deception Brook is a concrete frame carrying US302 over Deception Brook in Coos County, New Hampshire. It was built in 1974, so it is 51 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 3,842 vehicles a day, roughly 7% of them trucks, projected to reach 5,686 by 2043. The structure is 34 ft (10.4 m) long and 47 ft wide. If it were closed, the detour would be 72.1 mi (116 km).

CarriesUS302
CrossesDeception Brook
Location3.6 MI E. JCT US3
RouteU.S. Route 302
Coordinates44.26944, -71.47161
Functional classRural Principal Arterial - Other

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 inspectionMarch 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68 US tons
Inventory rating40 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length34 ft (10.4 m)
Longest span16 ft (4.9 m)
Deck width47 ft (14.2 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,842 (2023)
Projected traffic5,686 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed72.1 mi (116 km)
TollOn a free road
National Highway SystemYes

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 US302 over Deception Brook built?

It was built in 1974, making it 51 years old in 2025.

What condition is US302 over Deception 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 March 2024.

How much traffic does US302 over Deception Brook carry?

About 3,842 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US302 over Deception Brook?

The structure is 34 ft (10.4 m) long with a longest span of 16 ft (4.9 m) and a deck 47 ft wide.

Who owns US302 over Deception Brook?

It is owned by the State Highway Agency.