US Bridges

NH101 over NH101A CSX

Fair

Hillsborough County, New Hampshire · 0.2 MI W. Amherst T.L. · Structure no. 017201550011500

Built
1971
54 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
340 ft
3 main spans
Daily traffic
15,196
2023 count
Owner
State
State Highway Agency

About this bridge

NH101 over NH101A CSX is a steel continuous stringer/multi-beam or girder carrying NH101 over NH101A CSX in Hillsborough County, New Hampshire. It was built in 1971, so it is 54 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 5 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 15,196 vehicles a day, roughly 7% of them trucks, projected to reach 22,490 by 2043. The structure is 340 ft (103.6 m) long and 52 ft wide.

Location

Open in Google Maps
CarriesNH101
CrossesNH101A CSX
Location0.2 MI W. Amherst T.L.
RouteState Highway 101
CountyHillsborough County
StateNew Hampshire
Coordinates42.82474, -71.61728
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.6 US tons
Inventory rating33.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length340 ft (103.6 m)
Longest span133 ft (40.5 m)
Deck width52 ft (15.8 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,196 (2023)
Projected traffic22,490 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed—
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)
NavigationNot applicable (no waterway)

Frequently asked questions

When was NH101 over NH101A CSX built?

It was built in 1971, making it 54 years old in 2025.

What condition is NH101 over NH101A CSX 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 April 2024.

How much traffic does NH101 over NH101A CSX carry?

About 15,196 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is NH101 over NH101A CSX?

The structure is 340 ft (103.6 m) long with a longest span of 133 ft (40.5 m) and a deck 52 ft wide.

Who owns NH101 over NH101A CSX?

It is owned by the State Highway Agency.