US Bridges

Tannery Lane over Tannery Pond Outlet

Fair

Merrimack County, New Hampshire · 170 Ft. from Village Road · Structure no. 027501950011300

Built
1910
115 years old, rebuilt 1985
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
26 ft
1 main span
Daily traffic
96
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Tannery Lane over Tannery Pond Outlet is a steel stringer/multi-beam or girder carrying Tannery Lane over Tannery Pond Outlet in Merrimack County, New Hampshire. It was built in 1910 and reconstructed in 1985, so it is 115 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 6 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 96 vehicles a day, projected to reach 142 by 2043. The structure is 26 ft (7.9 m) long and 16 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesTannery Lane
CrossesTannery Pond Outlet
Location170 Ft. from Village Road
CountyMerrimack County
StateNew Hampshire
Coordinates43.41776, -71.89886
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.5 US tons
Inventory rating30.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span22 ft (6.7 m)
Deck width16 ft (4.9 m)
Roadway width11 ft (3.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic96 (2023)
Projected traffic142 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 Tannery Lane over Tannery Pond Outlet built?

It was built in 1910, making it 115 years old in 2025. It was reconstructed in 1985.

What condition is Tannery Lane over Tannery Pond Outlet 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 Tannery Lane over Tannery Pond Outlet carry?

About 96 vehicles per day (2023 count).

How long is Tannery Lane over Tannery Pond Outlet?

The structure is 26 ft (7.9 m) long with a longest span of 22 ft (6.7 m) and a deck 16 ft wide.

Who owns Tannery Lane over Tannery Pond Outlet?

It is owned by the City or Municipal Highway Agency.