US Bridges

Indian Brook Drive over Nh 16 SP Tpk

Good

Strafford County, New Hampshire · 1.8 MI from Rochester Tl · Structure no. 006501010015000

Built
1957
68 years old, rebuilt 1997
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
171 ft
4 main spans
Daily traffic
32,326
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

Indian Brook Drive over Nh 16 SP Tpk is a steel stringer/multi-beam or girder carrying Indian Brook Drive over Nh 16 SP Tpk in Strafford County, New Hampshire. It was built in 1957 and reconstructed in 1997, so it is 68 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 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 32,326 vehicles a day, roughly 8% of them trucks, projected to reach 47,842 by 2043. The structure is 171 ft (52.1 m) long and 68 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesIndian Brook Drive
CrossesNh 16 SP Tpk
Location1.8 MI from Rochester Tl
RouteCity Street 0
CountyStrafford County
StateNew Hampshire
Coordinates43.21821, -70.89424
Functional classUrban Other Principal Arterial

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 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 rating52 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length171 ft (52.1 m)
Longest span49 ft (14.9 m)
Deck width68 ft (20.8 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,326 (2023)
Projected traffic47,842 by 2043
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

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 Indian Brook Drive over Nh 16 SP Tpk built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1997.

What condition is Indian Brook Drive 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 Indian Brook Drive over Nh 16 SP Tpk carry?

About 32,326 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Indian Brook Drive over Nh 16 SP Tpk?

The structure is 171 ft (52.1 m) long with a longest span of 49 ft (14.9 m) and a deck 68 ft wide.

Who owns Indian Brook Drive over Nh 16 SP Tpk?

It is owned by the State Toll Authority.