US Bridges

Gerrish Road over Nh 16 SP Tpk

Good

Strafford County, New Hampshire · 0.1 MI from Jct. 16 · Structure no. 006501600008300

Built
1956
69 years old, rebuilt 2001
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
169 ft
4 main spans
Daily traffic
328
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

Gerrish Road over Nh 16 SP Tpk is a steel continuous stringer/multi-beam or girder carrying Gerrish Road over Nh 16 SP Tpk in Strafford County, New Hampshire. It was built in 1956 and reconstructed in 2001, so it is 69 years old, older 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 328 vehicles a day, roughly 2% of them trucks, projected to reach 485 by 2043. The structure is 169 ft (51.5 m) long and 30 ft wide.

Location

Open in Google Maps
CarriesGerrish Road
CrossesNh 16 SP Tpk
Location0.1 MI from Jct. 16
CountyStrafford County
StateNew Hampshire
Coordinates43.16435, -70.85519
Functional classUrban Local

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 inspectionApril 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 alignment6: Equal to present minimum criteria
Operating rating53.5 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length169 ft (51.5 m)
Longest span47 ft (14.3 m)
Deck width30 ft (9.2 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic328 (2023)
Projected traffic485 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

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 Gerrish Road over Nh 16 SP Tpk built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 2001.

What condition is Gerrish Road over Nh 16 SP 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 April 2023.

How much traffic does Gerrish Road over Nh 16 SP Tpk carry?

About 328 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Gerrish Road over Nh 16 SP Tpk?

The structure is 169 ft (51.5 m) long with a longest span of 47 ft (14.3 m) and a deck 30 ft wide.

Who owns Gerrish Road over Nh 16 SP Tpk?

It is owned by the State Toll Authority.