US Bridges

Nh 16 over Sessions Brook

Good

Coos County, New Hampshire · 1.1 MI S Cambridge Tl · Structure no. 006701510012300

Built
1926
99 years old, rebuilt 1993
Condition
Good
inspected July 2023
Type
Frame
Concrete
Length
22 ft
2 main spans
Daily traffic
1,529
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 16 over Sessions Brook is a concrete frame carrying Nh 16 over Sessions Brook in Coos County, New Hampshire. It was built in 1926 and reconstructed in 1993, so it is 99 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 1,529 vehicles a day, roughly 4% of them trucks, projected to reach 2,262 by 2043. The structure is 22 ft (6.7 m) long and 34 ft wide. If it were closed, the detour would be 64 mi (103 km).

Location

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CarriesNh 16
CrossesSessions Brook
Location1.1 MI S Cambridge Tl
RouteState Highway 16
CountyCoos County
StateNew Hampshire
Coordinates44.66637, -71.20514
Functional classRural 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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating99 US tons
Inventory rating74 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width34 ft (10.5 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,529 (2023)
Projected traffic2,262 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed64 mi (103 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
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)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nh 16 over Sessions Brook built?

It was built in 1926, making it 99 years old in 2025. It was reconstructed in 1993.

What condition is Nh 16 over Sessions Brook 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 July 2023.

How much traffic does Nh 16 over Sessions Brook carry?

About 1,529 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Nh 16 over Sessions Brook?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m) and a deck 34 ft wide.

Who owns Nh 16 over Sessions Brook?

It is owned by the State Highway Agency.