US Bridges

I-293 SB NH101 EB over Merrimack River CSX

Fair

Hillsborough County, New Hampshire · Manchester Tl · Structure no. 001901990012800

Built
1960
65 years old, rebuilt 2019
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
923 ft
7 main spans
Daily traffic
41,914
2023 count
Owner
State
State Highway Agency

About this bridge

I-293 SB NH101 EB over Merrimack River CSX is a steel continuous stringer/multi-beam or girder carrying I-293 SB NH101 EB over Merrimack River CSX in Hillsborough County, New Hampshire. It was built in 1960 and reconstructed in 2019, so it is 65 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 41,914 vehicles a day, roughly 6% of them trucks, projected to reach 62,032 by 2043. The structure is 923 ft (281.3 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-293 SB NH101 EB
CrossesMerrimack River CSX
LocationManchester Tl
RouteInterstate 293
Coordinates42.94706, -71.46076
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.8 US tons
Inventory rating43 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20 + Mod
Structure length923 ft (281.3 m)
Longest span180 ft (54.9 m)
Deck width55 ft (16.8 m)
Roadway width51 ft (15.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41,914 (2023)
Projected traffic62,032 by 2043
Trucks6%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad and waterway
Detour if closed1.2 mi (2 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)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-293 SB NH101 EB over Merrimack River CSX built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2019.

What condition is I-293 SB NH101 EB over Merrimack River CSX in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.

How much traffic does I-293 SB NH101 EB over Merrimack River CSX carry?

About 41,914 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I-293 SB NH101 EB over Merrimack River CSX?

The structure is 923 ft (281.3 m) long with a longest span of 180 ft (54.9 m) and a deck 55 ft wide.

Who owns I-293 SB NH101 EB over Merrimack River CSX?

It is owned by the State Highway Agency.