US Bridges

HWY Mill ST over RR Mbta/Csx

Fair

Middlesex County, Massachusetts · 0.1 MI N of Rt 135 · Structure no. N0301129VDOT634

Built
1900
125 years old, rebuilt 1968
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
69 ft
1 main span
Daily traffic
7,800
2023 count
Owner
State
State Highway Agency

About this bridge

HWY Mill ST over RR Mbta/Csx is a steel stringer/multi-beam or girder carrying HWY Mill ST over RR Mbta/Csx in Middlesex County, Massachusetts. It was built in 1900 and reconstructed in 1968, so it is 125 years old, older than the Massachusetts average of 63.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 7,800 vehicles a day, roughly 5% of them trucks, projected to reach 12,524 by 2032. The structure is 69 ft (21 m) long and 40 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesHWY Mill ST
CrossesRR Mbta/Csx
Location0.1 MI N of Rt 135
RouteCity Street 0
CountyMiddlesex County
StateMassachusetts
Coordinates42.28357, -71.38104
Functional classUrban Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.1 US tons
Inventory rating35.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length69 ft (21 m)
Longest span62 ft (18.9 m)
Deck width40 ft (12.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,800 (2023)
Projected traffic12,524 by 2032
Trucks5%
Lanes on structure2
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

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.6 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Mill ST over RR Mbta/Csx built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1968.

What condition is HWY Mill ST over RR Mbta/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 December 2023.

How much traffic does HWY Mill ST over RR Mbta/Csx carry?

About 7,800 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is HWY Mill ST over RR Mbta/Csx?

The structure is 69 ft (21 m) long with a longest span of 62 ft (18.9 m) and a deck 40 ft wide.

Who owns HWY Mill ST over RR Mbta/Csx?

It is owned by the State Highway Agency.