US Bridges

Elm Avenue over North Branch River

Fair

Hillsborough County, New Hampshire · 0.06MI NH9 · Structure no. 000901410014600

Built
1984
41 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
1 main span
Daily traffic
401
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Elm Avenue over North Branch River is a steel stringer/multi-beam or girder carrying Elm Avenue over North Branch River in Hillsborough County, New Hampshire. It was built in 1984, so it is 41 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 401 vehicles a day, roughly 4% of them trucks, projected to reach 593 by 2043. The structure is 60 ft (18.3 m) long and 31 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesElm Avenue
CrossesNorth Branch River
Location0.06MI NH9
CountyHillsborough County
StateNew Hampshire
Coordinates43.08063, -71.96755
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length60 ft (18.3 m)
Longest span56 ft (17.1 m)
Deck width31 ft (9.4 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic401 (2023)
Projected traffic593 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Elm Avenue over North Branch River built?

It was built in 1984, making it 41 years old in 2025.

What condition is Elm Avenue over North Branch 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 June 2024.

How much traffic does Elm Avenue over North Branch River carry?

About 401 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Elm Avenue over North Branch River?

The structure is 60 ft (18.3 m) long with a longest span of 56 ft (17.1 m) and a deck 31 ft wide.

Who owns Elm Avenue over North Branch River?

It is owned by the City or Municipal Highway Agency.