US Bridges

Salmon Falls Road over Salmon Falls River

Fair

Strafford County, New Hampshire · Maine State Line RD 5 · Structure no. 023700780012400

Built
1969
56 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
118 ft
1 main span
Daily traffic
5,060
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Salmon Falls Road over Salmon Falls River is a steel stringer/multi-beam or girder carrying Salmon Falls Road over Salmon Falls River in Strafford County, New Hampshire. It was built in 1969, so it is 56 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 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 5,060 vehicles a day, roughly 5% of them trucks, projected to reach 7,488 by 2043. The structure is 118 ft (36 m) long and 34 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesSalmon Falls Road
CrossesSalmon Falls River
LocationMaine State Line RD 5
Coordinates43.27848, -70.88264
Functional classUrban Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length118 ft (36 m)
Longest span112 ft (34.1 m)
Deck width34 ft (10.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,060 (2023)
Projected traffic7,488 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Salmon Falls Road over Salmon Falls River built?

It was built in 1969, making it 56 years old in 2025.

What condition is Salmon Falls Road 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 September 2024.

How much traffic does Salmon Falls Road over Salmon Falls River carry?

About 5,060 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Salmon Falls Road over Salmon Falls River?

The structure is 118 ft (36 m) long with a longest span of 112 ft (34.1 m) and a deck 34 ft wide.

Who owns Salmon Falls Road over Salmon Falls River?

It is owned by the City or Municipal Highway Agency.