US Bridges

Lebanon Street over Salmon Falls River

Fair

Strafford County, New Hampshire · Nh.-Me. Sl · Structure no. 017300810015900

Built
1920
105 years old, rebuilt 1998
Condition
Fair
inspected August 2023
Type
Slab
Concrete
Length
32 ft
1 main span
Daily traffic
557
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Lebanon Street over Salmon Falls River is a concrete slab carrying Lebanon Street over Salmon Falls River in Strafford County, New Hampshire. It was built in 1920 and reconstructed in 1998, so it is 105 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 5 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 557 vehicles a day, roughly 4% of them trucks, projected to reach 824 by 2043. The structure is 32 ft (9.9 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesLebanon Street
CrossesSalmon Falls River
LocationNh.-Me. Sl
Coordinates43.49791, -70.96156
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.6 US tons
Inventory rating46.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length32 ft (9.9 m)
Longest span27 ft (8.2 m)
Deck width32 ft (9.9 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic557 (2023)
Projected traffic824 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 Lebanon Street over Salmon Falls River built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1998.

What condition is Lebanon Street over Salmon Falls River 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 Lebanon Street over Salmon Falls River carry?

About 557 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Lebanon Street over Salmon Falls River?

The structure is 32 ft (9.9 m) long with a longest span of 27 ft (8.2 m) and a deck 32 ft wide.

Who owns Lebanon Street over Salmon Falls River?

It is owned by the City or Municipal Highway Agency.