US Bridges

Smith River Road over Smith River

Good

Merrimack County, New Hampshire · .25 Mi. W. of Hill Tl · Structure no. 005801240014600

Built
1941
84 years old, rebuilt 2001
Condition
Good
inspected May 2023
Type
Girder and Floorbeam System
Steel
Length
106 ft
1 main span
Daily traffic
276
2023 count
Owner
State
State Highway Agency

About this bridge

Smith River Road over Smith River is a steel girder and floorbeam system carrying Smith River Road over Smith River in Merrimack County, New Hampshire. It was built in 1941 and reconstructed in 2001, so it is 84 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 276 vehicles a day, roughly 10% of them trucks, projected to reach 408 by 2043. The structure is 106 ft (32.3 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesSmith River Road
CrossesSmith River
Location.25 Mi. W. of Hill Tl
RouteState Highway 0
Coordinates43.54075, -71.82049
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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.3 US tons
Inventory rating27.7 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length106 ft (32.3 m)
Longest span100 ft (30.5 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic276 (2023)
Projected traffic408 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Smith River Road over Smith River built?

It was built in 1941, making it 84 years old in 2025. It was reconstructed in 2001.

What condition is Smith River Road over Smith 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 May 2023.

How much traffic does Smith River Road over Smith River carry?

About 276 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Smith River Road over Smith River?

The structure is 106 ft (32.3 m) long with a longest span of 100 ft (30.5 m) and a deck 31 ft wide.

Who owns Smith River Road over Smith River?

It is owned by the State Highway Agency.