US Bridges

Nh 16 SP Tpk over Nh 75

Good

Strafford County, New Hampshire · 2.1 MI N of Rochester Tl · Structure no. 017302160011200

Built
1980
45 years old, rebuilt 2016
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
140 ft
1 main span
Daily traffic
14,518
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

Nh 16 SP Tpk over Nh 75 is a steel stringer/multi-beam or girder carrying Nh 16 SP Tpk over Nh 75 in Strafford County, New Hampshire. It was built in 1980 and reconstructed in 2016, so it is 45 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 14,518 vehicles a day, roughly 7% of them trucks, projected to reach 21,486 by 2043. The structure is 140 ft (42.7 m) long and 47 ft wide.

Location

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CarriesNh 16 SP Tpk
CrossesNh 75
Location2.1 MI N of Rochester Tl
CountyStrafford County
StateNew Hampshire
Coordinates43.40248, -71.00534
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length140 ft (42.7 m)
Longest span135 ft (41.1 m)
Deck width47 ft (14.2 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,518 (2023)
Projected traffic21,486 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 Nh 16 SP Tpk over Nh 75 built?

It was built in 1980, making it 45 years old in 2025. It was reconstructed in 2016.

What condition is Nh 16 SP Tpk over Nh 75 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 June 2023.

How much traffic does Nh 16 SP Tpk over Nh 75 carry?

About 14,518 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 16 SP Tpk over Nh 75?

The structure is 140 ft (42.7 m) long with a longest span of 135 ft (41.1 m) and a deck 47 ft wide.

Who owns Nh 16 SP Tpk over Nh 75?

It is owned by the State Toll Authority.