US Bridges

NH123 NH124 over Souhegan River Byp Hist

Good

Hillsborough County, New Hampshire · 1.4 MI from Greenville Tl · Structure no. 018601560009400

Built
2015
10 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
167 ft
1 main span
Daily traffic
5,564
2023 count
Owner
State
State Highway Agency

About this bridge

NH123 NH124 over Souhegan River Byp Hist is a steel stringer/multi-beam or girder carrying NH123 NH124 over Souhegan River Byp Hist in Hillsborough County, New Hampshire. It was built in 2015, so it is 10 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 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 5,564 vehicles a day, roughly 4% of them trucks, projected to reach 8,234 by 2043. The structure is 167 ft (50.9 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNH123 NH124
CrossesSouhegan River Byp Hist
Location1.4 MI from Greenville Tl
RouteState Highway 124
Coordinates42.7503, -71.82792
Functional classRural Major 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.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.2 US tons
Inventory rating45.7 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length167 ft (50.9 m)
Longest span160 ft (48.8 m)
Deck width43 ft (13.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,564 (2023)
Projected traffic8,234 by 2043
Trucks4%
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 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 NH123 NH124 over Souhegan River Byp Hist built?

It was built in 2015, making it 10 years old in 2025.

What condition is NH123 NH124 over Souhegan River Byp Hist 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 NH123 NH124 over Souhegan River Byp Hist carry?

About 5,564 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH123 NH124 over Souhegan River Byp Hist?

The structure is 167 ft (50.9 m) long with a longest span of 160 ft (48.8 m) and a deck 43 ft wide.

Who owns NH123 NH124 over Souhegan River Byp Hist?

It is owned by the State Highway Agency.