US Bridges

ST109 Main ST over Water Charles River

Fair

Norfolk County, Massachusetts · At Millis T.L. · Structure no. M110032AJDOTNBI

Built
1900
125 years old, rebuilt 1958
Condition
Fair
inspected August 2024
Type
Arch - Deck
Concrete
Length
67 ft
1 main span
Daily traffic
14,554
2023 count
Owner
State
State Highway Agency

About this bridge

ST109 Main ST over Water Charles River is a concrete arch - deck carrying ST109 Main ST over Water Charles River in Norfolk County, Massachusetts. It was built in 1900 and reconstructed in 1958, 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 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 14,554 vehicles a day, roughly 15% of them trucks, projected to reach 39,009 by 2031. The structure is 67 ft (20.4 m) long and 50 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesST109 Main ST
CrossesWater Charles River
LocationAt Millis T.L.
RouteState Highway 109
CountyNorfolk County
StateMassachusetts
Coordinates42.18114, -71.32268
Functional classUrban Other Principal Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.3 US tons
Inventory rating38.6 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length67 ft (20.4 m)
Longest span62 ft (19 m)
Deck width50 ft (15.3 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,554 (2023)
Projected traffic39,009 by 2031
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$541,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST109 Main ST over Water Charles River built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1958.

What condition is ST109 Main ST over Water Charles River 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 August 2024.

How much traffic does ST109 Main ST over Water Charles River carry?

About 14,554 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is ST109 Main ST over Water Charles River?

The structure is 67 ft (20.4 m) long with a longest span of 62 ft (19 m) and a deck 50 ft wide.

Who owns ST109 Main ST over Water Charles River?

It is owned by the State Highway Agency.