US Bridges

Nh 9 over Catsbane Brook

Good

Cheshire County, New Hampshire · 2.5 MI from Vt Sl · Structure no. 004500820011300

Built
1937
88 years old, rebuilt 1984
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
77 ft
1 main span
Daily traffic
11,100
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 9 over Catsbane Brook is a steel stringer/multi-beam or girder carrying Nh 9 over Catsbane Brook in Cheshire County, New Hampshire. It was built in 1937 and reconstructed in 1984, so it is 88 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 11,100 vehicles a day, roughly 7% of them trucks, projected to reach 16,428 by 2043. The structure is 77 ft (23.5 m) long and 47 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesNh 9
CrossesCatsbane Brook
Location2.5 MI from Vt Sl
RouteState Highway 9
CountyCheshire County
StateNew Hampshire
Coordinates42.8957, -72.5101
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 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 alignment8: Equal to present desirable criteria
Operating rating86 US tons
Inventory rating52 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length77 ft (23.5 m)
Longest span61 ft (18.6 m)
Deck width47 ft (14.2 m)
Roadway width42 ft (12.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,100 (2023)
Projected traffic16,428 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 Nh 9 over Catsbane Brook built?

It was built in 1937, making it 88 years old in 2025. It was reconstructed in 1984.

What condition is Nh 9 over Catsbane Brook in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does Nh 9 over Catsbane Brook carry?

About 11,100 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 9 over Catsbane Brook?

The structure is 77 ft (23.5 m) long with a longest span of 61 ft (18.6 m) and a deck 47 ft wide.

Who owns Nh 9 over Catsbane Brook?

It is owned by the State Highway Agency.