US Bridges

Old Nh 11 over Merrymeeting River

Fair

Strafford County, New Hampshire · 0.2 MI SE Alton Tl · Structure no. 018201990005400

Built
1926
99 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
24 ft
1 main span
Daily traffic
662
2023 count
Owner
State
State Highway Agency

About this bridge

Old Nh 11 over Merrymeeting River is a steel stringer/multi-beam or girder carrying Old Nh 11 over Merrymeeting River in Strafford County, New Hampshire. It was built in 1926, so it is 99 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 662 vehicles a day, roughly 4% of them trucks, projected to reach 979 by 2043. The structure is 24 ft (7.3 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesOld Nh 11
CrossesMerrymeeting River
Location0.2 MI SE Alton Tl
RouteState Highway 0
Coordinates43.43802, -71.17251
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
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.
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 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating37.6 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length24 ft (7.3 m)
Longest span20 ft (6.1 m)
Deck width31 ft (9.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic662 (2023)
Projected traffic979 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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 Old Nh 11 over Merrymeeting River built?

It was built in 1926, making it 99 years old in 2025.

What condition is Old Nh 11 over Merrymeeting 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 2024.

How much traffic does Old Nh 11 over Merrymeeting River carry?

About 662 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Old Nh 11 over Merrymeeting River?

The structure is 24 ft (7.3 m) long with a longest span of 20 ft (6.1 m) and a deck 31 ft wide.

Who owns Old Nh 11 over Merrymeeting River?

It is owned by the State Highway Agency.