US Bridges

Nh 3A over I-93 Fee Tpk

Good

Merrimack County, New Hampshire · 0.3 MI N of Bow Tl · Structure no. 005202030008800

Built
2015
10 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
193 ft
1 main span
Daily traffic
13,754
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

Nh 3A over I-93 Fee Tpk is a steel stringer/multi-beam or girder carrying Nh 3A over I-93 Fee Tpk in Merrimack 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 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 13,754 vehicles a day, roughly 5% of them trucks, projected to reach 20,355 by 2043. The structure is 193 ft (58.8 m) long and 55 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNh 3A
CrossesI-93 Fee Tpk
Location0.3 MI N of Bow Tl
RouteU.S. Route 3A
CountyMerrimack County
StateNew Hampshire
Coordinates43.17984, -71.53096
Functional classUrban Minor Arterial

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.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating88.1 US tons
Inventory rating67.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length193 ft (58.8 m)
Longest span185 ft (56.4 m)
Deck width55 ft (16.8 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,754 (2023)
Projected traffic20,355 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
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 Nh 3A over I-93 Fee Tpk built?

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

What condition is Nh 3A over I-93 Fee Tpk 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 2023.

How much traffic does Nh 3A over I-93 Fee Tpk carry?

About 13,754 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Nh 3A over I-93 Fee Tpk?

The structure is 193 ft (58.8 m) long with a longest span of 185 ft (56.4 m) and a deck 55 ft wide.

Who owns Nh 3A over I-93 Fee Tpk?

It is owned by the State Toll Authority.