US Bridges

ST 4 Nashua RD over Water Concord River

Good

Middlesex County, Massachusetts · 1 MI N of Bedford T.L. · Structure no. B120019CPDOTNBI

Built
2008
17 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
158 ft
3 main spans
Daily traffic
13,600
2019 count
Owner
State
State Highway Agency

About this bridge

ST 4 Nashua RD over Water Concord River is a steel continuous stringer/multi-beam or girder carrying ST 4 Nashua RD over Water Concord River in Middlesex County, Massachusetts. It was built in 2008, so it is 17 years old, younger than the Massachusetts average of 63.8 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 13,600 vehicles a day, roughly 10% of them trucks, projected to reach 15,003 by 2032. The structure is 158 ft (48.1 m) long and 49 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesST 4 Nashua RD
CrossesWater Concord River
Location1 MI N of Bedford T.L.
RouteState Highway 4
CountyMiddlesex County
StateMassachusetts
Coordinates42.53494, -71.29958
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating106.7 US tons
Inventory rating63.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length158 ft (48.1 m)
Longest span54 ft (16.5 m)
Deck width49 ft (15 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,600 (2019)
Projected traffic15,003 by 2032
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST 4 Nashua RD over Water Concord River built?

It was built in 2008, making it 17 years old in 2025.

What condition is ST 4 Nashua RD over Water Concord River 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 ST 4 Nashua RD over Water Concord River carry?

About 13,600 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is ST 4 Nashua RD over Water Concord River?

The structure is 158 ft (48.1 m) long with a longest span of 54 ft (16.5 m) and a deck 49 ft wide.

Who owns ST 4 Nashua RD over Water Concord River?

It is owned by the State Highway Agency.