US Bridges

Hilltop Road over I-93

Good

Grafton County, New Hampshire · 0.24MI. from Rd. #14 · Structure no. 015301610008900

Built
1985
40 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
269 ft
2 main spans
Daily traffic
354
2023 count
Owner
State
State Highway Agency

About this bridge

Hilltop Road over I-93 is a steel continuous stringer/multi-beam or girder carrying Hilltop Road over I-93 in Grafton County, New Hampshire. It was built in 1985, so it is 40 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 354 vehicles a day, roughly 4% of them trucks, projected to reach 523 by 2043. The structure is 269 ft (82 m) long and 37 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesHilltop Road
CrossesI-93
Location0.24MI. from Rd. #14
CountyGrafton County
StateNew Hampshire
Coordinates44.32018, -71.82714
Functional classRural Local

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating37.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length269 ft (82 m)
Longest span130 ft (39.6 m)
Deck width37 ft (11.4 m)
Roadway width33 ft (10.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic354 (2023)
Projected traffic523 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 Hilltop Road over I-93 built?

It was built in 1985, making it 40 years old in 2025.

What condition is Hilltop Road over I-93 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 April 2023.

How much traffic does Hilltop Road over I-93 carry?

About 354 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Hilltop Road over I-93?

The structure is 269 ft (82 m) long with a longest span of 130 ft (39.6 m) and a deck 37 ft wide.

Who owns Hilltop Road over I-93?

It is owned by the State Highway Agency.