US Bridges

Nh 9 NH236 over Salmon Falls River

Good

Strafford County, New Hampshire · Maine S.L. · Structure no. 023701010011400

Built
1962
63 years old, rebuilt 2015
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
114 ft
1 main span
Daily traffic
13,459
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Nh 9 NH236 over Salmon Falls River is a steel stringer/multi-beam or girder carrying Nh 9 NH236 over Salmon Falls River in Strafford County, New Hampshire. It was built in 1962 and reconstructed in 2015, so it is 63 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 13,459 vehicles a day, roughly 5% of them trucks, projected to reach 19,919 by 2043. The structure is 114 ft (34.7 m) long and 56 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesNh 9 NH236
CrossesSalmon Falls River
LocationMaine S.L.
RouteState Highway 9
Coordinates43.26558, -70.86453
Functional classUrban Other Principal 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 protection7 GoodSome minor problems.
Last inspectionSeptember 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating72.5 US tons
Inventory rating43.4 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length114 ft (34.7 m)
Longest span110 ft (33.5 m)
Deck width56 ft (17.1 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,459 (2023)
Projected traffic19,919 by 2043
Trucks5%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.8 mi (11 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 9 NH236 over Salmon Falls River built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2015.

What condition is Nh 9 NH236 over Salmon Falls 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 September 2024.

How much traffic does Nh 9 NH236 over Salmon Falls River carry?

About 13,459 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Nh 9 NH236 over Salmon Falls River?

The structure is 114 ft (34.7 m) long with a longest span of 110 ft (33.5 m) and a deck 56 ft wide.

Who owns Nh 9 NH236 over Salmon Falls River?

It is owned by the City or Municipal Highway Agency.