US Bridges

Washington Street over Mill Outlet

Good

Merrimack County, New Hampshire · 0.4MI. US3 · Structure no. 005200450008500

Built
1988
37 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
72 ft
1 main span
Daily traffic
2,533
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Washington Street over Mill Outlet is a steel stringer/multi-beam or girder carrying Washington Street over Mill Outlet in Merrimack County, New Hampshire. It was built in 1988, so it is 37 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 2,533 vehicles a day, roughly 4% of them trucks, projected to reach 3,748 by 2043. The structure is 72 ft (21.9 m) long and 42 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesWashington Street
CrossesMill Outlet
Location0.4MI. US3
RouteCity Street 0
Coordinates43.27486, -71.60417
Functional classUrban Local

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.6 US tons
Inventory rating45 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length72 ft (21.9 m)
Longest span65 ft (19.8 m)
Deck width42 ft (12.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,533 (2023)
Projected traffic3,748 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
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 Washington Street over Mill Outlet built?

It was built in 1988, making it 37 years old in 2025.

What condition is Washington Street over Mill Outlet 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 Washington Street over Mill Outlet carry?

About 2,533 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Washington Street over Mill Outlet?

The structure is 72 ft (21.9 m) long with a longest span of 65 ft (19.8 m) and a deck 42 ft wide.

Who owns Washington Street over Mill Outlet?

It is owned by the City or Municipal Highway Agency.