US Bridges

Nh 11 over Elbow Brook

Fair

Merrimack County, New Hampshire · 5.8 MI from Franklin Tl · Structure no. 000801290010100

Built
1934
91 years old, rebuilt 2003
Condition
Fair
inspected May 2024
Type
Frame
Concrete
Length
25 ft
1 main span
Daily traffic
2,944
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 11 over Elbow Brook is a concrete frame carrying Nh 11 over Elbow Brook in Merrimack County, New Hampshire. It was built in 1934 and reconstructed in 2003, so it is 91 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 2,944 vehicles a day, roughly 7% of them trucks, projected to reach 4,357 by 2043. The structure is 25 ft (7.6 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNh 11
CrossesElbow Brook
Location5.8 MI from Franklin Tl
RouteState Highway 11
CountyMerrimack County
StateNew Hampshire
Coordinates43.43793, -71.79164
Functional classRural 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 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 geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating36.7 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length25 ft (7.6 m)
Longest span25 ft (7.5 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,944 (2023)
Projected traffic4,357 by 2043
Trucks7%
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

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 Nh 11 over Elbow Brook built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 2003.

What condition is Nh 11 over Elbow Brook 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 May 2024.

How much traffic does Nh 11 over Elbow Brook carry?

About 2,944 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 11 over Elbow Brook?

The structure is 25 ft (7.6 m) long with a longest span of 25 ft (7.5 m) and a deck 44 ft wide.

Who owns Nh 11 over Elbow Brook?

It is owned by the State Highway Agency.