US Bridges

I-93 SB over Beaver Brook

Good

Rockingham County, New Hampshire · Derry T/L · Structure no. 015401590009900

Built
2020
5 years old
Condition
Good
inspected June 2023
Type
Tee Beam
Prestressed Concrete
Length
78 ft
1 main span
Daily traffic
42,082
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 SB over Beaver Brook is a prestressed concrete tee beam carrying I-93 SB over Beaver Brook in Rockingham County, New Hampshire. It was built in 2020, so it is 5 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 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 42,082 vehicles a day, roughly 9% of them trucks, projected to reach 62,281 by 2043. The structure is 78 ft (23.9 m) long and 75 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesI-93 SB
CrossesBeaver Brook
LocationDerry T/L
RouteInterstate 93
CountyRockingham County
StateNew Hampshire
Coordinates42.86092, -71.33467
Functional classUrban Principal Arterial - Interstate

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.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96 US tons
Inventory rating74 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length78 ft (23.9 m)
Longest span75 ft (22.9 m)
Deck width75 ft (22.9 m)
Roadway width71 ft (21.7 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic42,082 (2023)
Projected traffic62,281 by 2043
Trucks9%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
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 I-93 SB over Beaver Brook built?

It was built in 2020, making it 5 years old in 2025.

What condition is I-93 SB over Beaver 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 June 2023.

How much traffic does I-93 SB over Beaver Brook carry?

About 42,082 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 SB over Beaver Brook?

The structure is 78 ft (23.9 m) long with a longest span of 75 ft (22.9 m) and a deck 75 ft wide.

Who owns I-93 SB over Beaver Brook?

It is owned by the State Highway Agency.