US Bridges

ST 58 County RD over I 495

Fair

Plymouth County, Massachusetts · .4 M N of RTE 28 · Structure no. W0603349PDOTNBI

Built
1964
61 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
221 ft
3 main spans
Daily traffic
20,301
2019 count
Owner
State
State Highway Agency

About this bridge

ST 58 County RD over I 495 is a steel stringer/multi-beam or girder carrying ST 58 County RD over I 495 in Plymouth County, Massachusetts. It was built in 1964, so it is 61 years old, younger 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 20,301 vehicles a day, roughly 12% of them trucks, projected to reach 26,848 by 2032. The structure is 221 ft (67.4 m) long and 53 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesST 58 County RD
CrossesI 495
Location.4 M N of RTE 28
RouteState Highway 58
CountyPlymouth County
StateMassachusetts
Coordinates41.80631, -70.76951
Functional classUrban Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.4 US tons
Inventory rating27.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length221 ft (67.4 m)
Longest span78 ft (23.8 m)
Deck width53 ft (16.1 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,301 (2019)
Projected traffic26,848 by 2032
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed5 mi (8 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$10.7 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 58 County RD over I 495 built?

It was built in 1964, making it 61 years old in 2025.

What condition is ST 58 County RD over I 495 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 March 2023.

How much traffic does ST 58 County RD over I 495 carry?

About 20,301 vehicles per day (2019 count), of which roughly 12% are trucks.

How long is ST 58 County RD over I 495?

The structure is 221 ft (67.4 m) long with a longest span of 78 ft (23.8 m) and a deck 53 ft wide.

Who owns ST 58 County RD over I 495?

It is owned by the State Highway Agency.