US Bridges

Nh 16 SB over Dead River

Good

Coos County, New Hampshire · 1.5 MI N of Gorham Tl · Structure no. 002302350006100

Built
1931
94 years old, rebuilt 1995
Condition
Good
inspected August 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
4,241
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Nh 16 SB over Dead River is a prestressed concrete box beam or girders - multiple carrying Nh 16 SB over Dead River in Coos County, New Hampshire. It was built in 1931 and reconstructed in 1995, so it is 94 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 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 4,241 vehicles a day, roughly 5% of them trucks, projected to reach 6,276 by 2043. The structure is 24 ft (7.3 m) long and 52 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNh 16 SB
CrossesDead River
Location1.5 MI N of Gorham Tl
RouteState Highway 16
Coordinates44.46974, -71.1821
Functional classUrban Minor Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 rating85.1 US tons
Inventory rating50.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length24 ft (7.3 m)
Longest span22 ft (6.7 m)
Deck width52 ft (15.7 m)
Roadway width36 ft (10.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,241 (2023)
Projected traffic6,276 by 2043
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Nh 16 SB over Dead River built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1995.

What condition is Nh 16 SB over Dead River 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 Nh 16 SB over Dead River carry?

About 4,241 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Nh 16 SB over Dead River?

The structure is 24 ft (7.3 m) long with a longest span of 22 ft (6.7 m) and a deck 52 ft wide.

Who owns Nh 16 SB over Dead River?

It is owned by the City or Municipal Highway Agency.