US Bridges

Zaccaria Road over Smith River

PoorPosted for load

Merrimack County, New Hampshire · 0.15 MI South US 4 · Structure no. 005801090006500

Built
1950
75 years old, rebuilt 1995
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
28 ft
1 main span
Daily traffic
96
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Zaccaria Road over Smith River is a steel stringer/multi-beam or girder carrying Zaccaria Road over Smith River in Merrimack County, New Hampshire. It was built in 1950 and reconstructed in 1995, so it is 75 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 poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 96 vehicles a day, projected to reach 142 by 2043. The structure is 28 ft (8.5 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesZaccaria Road
CrossesSmith River
Location0.15 MI South US 4
Coordinates43.55235, -71.90225
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 16 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating11.2 US tons
Inventory rating8.3 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span25 ft (7.6 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.4 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 closed123.7 mi (199 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 Zaccaria Road over Smith River built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1995.

What condition is Zaccaria Road over Smith River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.

How much traffic does Zaccaria Road over Smith River carry?

About 96 vehicles per day (2023 count).

How long is Zaccaria Road over Smith River?

The structure is 28 ft (8.5 m) long with a longest span of 25 ft (7.6 m) and a deck 16 ft wide.

Who owns Zaccaria Road over Smith River?

It is owned by the City or Municipal Highway Agency.