US Bridges

Centre ST over Otter Brook

Fair

Cheshire County, New Hampshire · 4.46 MI Gilsum Tl. · Structure no. 024600940006400

Built
1981
44 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
85 ft
1 main span
Daily traffic
664
2023 count
Owner
State
State Highway Agency

About this bridge

Centre ST over Otter Brook is a steel stringer/multi-beam or girder carrying Centre ST over Otter Brook in Cheshire 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 664 vehicles a day, roughly 10% of them trucks, projected to reach 982 by 2043. The structure is 85 ft (25.9 m) long and 32 ft wide.

Location

Open in Google Maps
CarriesCentre ST
CrossesOtter Brook
Location4.46 MI Gilsum Tl.
RouteState Highway 0
CountyCheshire County
StateNew Hampshire
Coordinates42.99354, -72.19464
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
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 evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating68.8 US tons
Inventory rating41.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length85 ft (25.9 m)
Longest span80 ft (24.4 m)
Deck width32 ft (9.9 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic664 (2023)
Projected traffic982 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 Centre ST over Otter Brook built?

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

What condition is Centre ST over Otter Brook 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 Centre ST over Otter Brook carry?

About 664 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Centre ST over Otter Brook?

The structure is 85 ft (25.9 m) long with a longest span of 80 ft (24.4 m) and a deck 32 ft wide.

Who owns Centre ST over Otter Brook?

It is owned by the State Highway Agency.