US Bridges

NH135 over I-93

Fair

Grafton County, New Hampshire · 4 MI N of Bethlehem Tl · Structure no. 015301850009000

Built
1981
44 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
280 ft
2 main spans
Daily traffic
4,909
2023 count
Owner
State
State Highway Agency

About this bridge

NH135 over I-93 is a steel continuous stringer/multi-beam or girder carrying NH135 over I-93 in Grafton 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 4,909 vehicles a day, roughly 10% of them trucks, projected to reach 7,265 by 2043. The structure is 280 ft (85.3 m) long and 72 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesNH135
CrossesI-93
Location4 MI N of Bethlehem Tl
RouteState Highway 135
CountyGrafton County
StateNew Hampshire
Coordinates44.32511, -71.80606
Functional classRural Major 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.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.2 US tons
Inventory rating29 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length280 ft (85.3 m)
Longest span158 ft (48.2 m)
Deck width72 ft (21.8 m)
Roadway width63 ft (19.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,909 (2023)
Projected traffic7,265 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.7 mi (6 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)
NavigationNot applicable (no waterway)

Frequently asked questions

When was NH135 over I-93 built?

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

What condition is NH135 over I-93 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 2023.

How much traffic does NH135 over I-93 carry?

About 4,909 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is NH135 over I-93?

The structure is 280 ft (85.3 m) long with a longest span of 158 ft (48.2 m) and a deck 72 ft wide.

Who owns NH135 over I-93?

It is owned by the State Highway Agency.