US Bridges

NH123A over Warren Brook

Good

Cheshire County, New Hampshire · 0.40 MI SW Langdon Tl · Structure no. 000500720016300

Built
2020
5 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
77 ft
1 main span
Daily traffic
1,161
2023 count
Owner
State
State Highway Agency

About this bridge

NH123A over Warren Brook is a steel stringer/multi-beam or girder carrying NH123A over Warren Brook in Cheshire County, New Hampshire. It was built in 2020, so it is 5 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 good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,161 vehicles a day, roughly 10% of them trucks, projected to reach 1,718 by 2043. The structure is 77 ft (23.6 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNH123A
CrossesWarren Brook
Location0.40 MI SW Langdon Tl
RouteState Highway 123A
CountyCheshire County
StateNew Hampshire
Coordinates43.15181, -72.35011
Functional classRural Minor Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating70.5 US tons
Inventory rating54.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length77 ft (23.6 m)
Longest span71 ft (21.6 m)
Deck width35 ft (10.7 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,161 (2023)
Projected traffic1,718 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for 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 NH123A over Warren Brook built?

It was built in 2020, making it 5 years old in 2025.

What condition is NH123A over Warren 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 May 2024.

How much traffic does NH123A over Warren Brook carry?

About 1,161 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is NH123A over Warren Brook?

The structure is 77 ft (23.6 m) long with a longest span of 71 ft (21.6 m) and a deck 35 ft wide.

Who owns NH123A over Warren Brook?

It is owned by the State Highway Agency.