US Bridges

US 4 Nh 16 SP Tpk over Shawayttuck

Good

Rockingham County, New Hampshire · 2.5 MI from Portsmouth T · Structure no. 018501030012400

Built
1983
42 years old, rebuilt 2021
Condition
Good
inspected April 2023
Type
Frame
Concrete
Length
48 ft
1 main span
Daily traffic
68,236
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

US 4 Nh 16 SP Tpk over Shawayttuck is a concrete frame carrying US 4 Nh 16 SP Tpk over Shawayttuck in Rockingham County, New Hampshire. It was built in 1983 and reconstructed in 2021, so it is 42 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 68,236 vehicles a day, roughly 8% of them trucks, projected to reach 100,989 by 2043. The structure is 48 ft (14.6 m) long and 167 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS 4 Nh 16 SP Tpk
CrossesShawayttuck
Location2.5 MI from Portsmouth T
RouteU.S. Route 4
CountyRockingham County
StateNew Hampshire
Coordinates43.11546, -70.82268
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating89.9 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length48 ft (14.6 m)
Longest span42 ft (12.8 m)
Deck width167 ft (51 m)
Roadway width98 ft (30 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic68,236 (2023)
Projected traffic100,989 by 2043
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
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 US 4 Nh 16 SP Tpk over Shawayttuck built?

It was built in 1983, making it 42 years old in 2025. It was reconstructed in 2021.

What condition is US 4 Nh 16 SP Tpk over Shawayttuck 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 US 4 Nh 16 SP Tpk over Shawayttuck carry?

About 68,236 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is US 4 Nh 16 SP Tpk over Shawayttuck?

The structure is 48 ft (14.6 m) long with a longest span of 42 ft (12.8 m) and a deck 167 ft wide.

Who owns US 4 Nh 16 SP Tpk over Shawayttuck?

It is owned by the State Toll Authority.