US Bridges

Webster Mills Road over Suncook River

Fair

Merrimack County, New Hampshire · At Pittsfield T/L · Structure no. 004601640013500

Built
1981
44 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
166 ft
2 main spans
Daily traffic
1,060
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Webster Mills Road over Suncook River is a steel stringer/multi-beam or girder carrying Webster Mills Road over Suncook River in Merrimack County, New Hampshire. It was built in 1981, so it is 44 years old, younger 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 1,060 vehicles a day, roughly 4% of them trucks, projected to reach 1,568 by 2043. The structure is 166 ft (50.6 m) long and 32 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesWebster Mills Road
CrossesSuncook River
LocationAt Pittsfield T/L
CountyMerrimack County
StateNew Hampshire
Coordinates43.27871, -71.34581
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating49.3 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length166 ft (50.6 m)
Longest span80 ft (24.4 m)
Deck width32 ft (9.9 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,060 (2023)
Projected traffic1,568 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Webster Mills Road over Suncook River built?

It was built in 1981, making it 44 years old in 2025.

What condition is Webster Mills Road 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 October 2024.

How much traffic does Webster Mills Road over Suncook River carry?

About 1,060 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Webster Mills Road over Suncook River?

The structure is 166 ft (50.6 m) long with a longest span of 80 ft (24.4 m) and a deck 32 ft wide.

Who owns Webster Mills Road over Suncook River?

It is owned by the City or Municipal Highway Agency.