US Bridges

US 3 Water ST over CSX

Good

Merrimack County, New Hampshire · 0.3 MI West of JCT I-93 · Structure no. 005201800010000

Built
2000
25 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
233 ft
2 main spans
Daily traffic
20,544
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

US 3 Water ST over CSX is a steel continuous stringer/multi-beam or girder carrying US 3 Water ST over CSX in Merrimack County, New Hampshire. It was built in 2000, so it is 25 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 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 20,544 vehicles a day, projected to reach 30,405 by 2043. The structure is 233 ft (71 m) long and 84 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS 3 Water ST
CrossesCSX
Location0.3 MI West of JCT I-93
RouteU.S. Route 3
CountyMerrimack County
StateNew Hampshire
Coordinates43.19639, -71.52955
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating89.8 US tons
Inventory rating53.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length233 ft (71 m)
Longest span123 ft (37.5 m)
Deck width84 ft (25.6 m)
Roadway width69 ft (21 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,544 (2023)
Projected traffic30,405 by 2043
Trucks0%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 US 3 Water ST over CSX built?

It was built in 2000, making it 25 years old in 2025.

What condition is US 3 Water ST over CSX 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 US 3 Water ST over CSX carry?

About 20,544 vehicles per day (2023 count).

How long is US 3 Water ST over CSX?

The structure is 233 ft (71 m) long with a longest span of 123 ft (37.5 m) and a deck 84 ft wide.

Who owns US 3 Water ST over CSX?

It is owned by the City or Municipal Highway Agency.