US Bridges

ST 9 Boylston ST over HWY Chestnut ST

Fair

Middlesex County, Massachusetts · 0.64 KM Ely Rt 128 · Structure no. N120492EFDOTNBI

Built
1932
93 years old
Condition
Fair
inspected August 2024
Type
Frame
Concrete
Length
58 ft
1 main span
Daily traffic
82,758
2024 count
Owner
State
State Highway Agency

About this bridge

ST 9 Boylston ST over HWY Chestnut ST is a concrete frame carrying ST 9 Boylston ST over HWY Chestnut ST in Middlesex County, Massachusetts. It was built in 1932, so it is 93 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 82,758 vehicles a day, roughly 5% of them trucks, projected to reach 93,179 by 2031. The structure is 58 ft (17.7 m) long and 58 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesST 9 Boylston ST
CrossesHWY Chestnut ST
Location0.64 KM Ely Rt 128
RouteState Highway 9
CountyMiddlesex County
StateMassachusetts
Coordinates42.31708, -71.22578
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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment7: Better than present minimum criteria
Operating rating67.1 US tons
Inventory rating40.3 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckNot applicable
Main spans1
Design loadH 20
Structure length58 ft (17.7 m)
Longest span50 ft (15.2 m)
Deck width58 ft (17.7 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic82,758 (2024)
Projected traffic93,179 by 2031
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.1 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 9 Boylston ST over HWY Chestnut ST built?

It was built in 1932, making it 93 years old in 2025.

What condition is ST 9 Boylston ST over HWY Chestnut ST 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 ST 9 Boylston ST over HWY Chestnut ST carry?

About 82,758 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is ST 9 Boylston ST over HWY Chestnut ST?

The structure is 58 ft (17.7 m) long with a longest span of 50 ft (15.2 m) and a deck 58 ft wide.

Who owns ST 9 Boylston ST over HWY Chestnut ST?

It is owned by the State Highway Agency.