US Bridges

I-93 NB over Beaver Brook

Good

Rockingham County, New Hampshire · At Londonderry Tl · Structure no. 006300510007100

Built
2019
6 years old
Condition
Good
inspected March 2023
Type
Tee Beam
Prestressed Concrete
Length
78 ft
1 main span
Daily traffic
41,528
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 NB over Beaver Brook is a prestressed concrete tee beam carrying I-93 NB over Beaver Brook in Rockingham County, New Hampshire. It was built in 2019, so it is 6 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 41,528 vehicles a day, roughly 6% of them trucks, projected to reach 61,461 by 2043. The structure is 78 ft (23.9 m) long and 88 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesI-93 NB
CrossesBeaver Brook
LocationAt Londonderry Tl
RouteInterstate 93
CountyRockingham County
StateNew Hampshire
Coordinates42.86148, -71.33395
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
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95.9 US tons
Inventory rating60.4 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length78 ft (23.9 m)
Longest span72 ft (21.9 m)
Deck width88 ft (26.9 m)
Roadway width84 ft (25.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41,528 (2023)
Projected traffic61,461 by 2043
Trucks6%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 NB over Beaver Brook built?

It was built in 2019, making it 6 years old in 2025.

What condition is I-93 NB 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 March 2023.

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

About 41,528 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I-93 NB over Beaver Brook?

The structure is 78 ft (23.9 m) long with a longest span of 72 ft (21.9 m) and a deck 88 ft wide.

Who owns I-93 NB over Beaver Brook?

It is owned by the State Highway Agency.