US Bridges

Main Street over Suncook River

Fair

Merrimack County, New Hampshire · 1.3 MI N Chichester Tl · Structure no. 021200900010400

Built
1942
83 years old
Condition
Fair
inspected May 2024
Type
Arch - Deck
Masonry
Length
73 ft
1 main span
Daily traffic
4,409
2023 count
Owner
State
State Highway Agency

About this bridge

Main Street over Suncook River is a masonry arch - deck carrying Main Street over Suncook River in Merrimack County, New Hampshire. It was built in 1942, so it is 83 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 4,409 vehicles a day, roughly 10% of them trucks, projected to reach 6,525 by 2043. The structure is 73 ft (22.3 m) long and 85 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesMain Street
CrossesSuncook River
Location1.3 MI N Chichester Tl
RouteState Highway 0
Coordinates43.3053, -71.33082
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating52.9 US tons
Inventory rating31.7 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length73 ft (22.3 m)
Longest span40 ft (12.2 m)
Deck width85 ft (25.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,409 (2023)
Projected traffic6,525 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 statusListed on the National Register of Historic Places
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 Main Street over Suncook River built?

It was built in 1942, making it 83 years old in 2025.

What condition is Main Street over Suncook 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 May 2024.

How much traffic does Main Street over Suncook River carry?

About 4,409 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Main Street over Suncook River?

The structure is 73 ft (22.3 m) long with a longest span of 40 ft (12.2 m) and a deck 85 ft wide.

Who owns Main Street over Suncook River?

It is owned by the State Highway Agency.