US Bridges

NH113A over Swift River

Good

Carroll County, New Hampshire · 4.5 MI from Sandwich Tl · Structure no. 025200610009100

Built
1956
69 years old, rebuilt 2023
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
156 ft
3 main spans
Daily traffic
356
2023 count
Owner
State
State Highway Agency

About this bridge

NH113A over Swift River is a steel continuous stringer/multi-beam or girder carrying NH113A over Swift River in Carroll County, New Hampshire. It was built in 1956 and reconstructed in 2023, so it is 69 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 356 vehicles a day, roughly 10% of them trucks, projected to reach 526 by 2043. The structure is 156 ft (47.5 m) long and 28 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesNH113A
CrossesSwift River
Location4.5 MI from Sandwich Tl
RouteState Highway 113A
Coordinates43.89217, -71.29813
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.6 US tons
Inventory rating66.1 US tons

Structure

MaterialSteel Continuous
DeckConcrete, precast panels
Main spans3
Design loadHL 93
Structure length156 ft (47.5 m)
Longest span56 ft (17.1 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic356 (2023)
Projected traffic526 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 NH113A over Swift River built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 2023.

What condition is NH113A over Swift 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 November 2023.

How much traffic does NH113A over Swift River carry?

About 356 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is NH113A over Swift River?

The structure is 156 ft (47.5 m) long with a longest span of 56 ft (17.1 m) and a deck 28 ft wide.

Who owns NH113A over Swift River?

It is owned by the State Highway Agency.