US Bridges

HWY North Rotary over ST 99 Sullivan Sq Undrps

Fair

Suffolk County, Massachusetts · 1.6 KM N of N Wshngton ST · Structure no. B1624537XMUNNBI

Built
1951
74 years old
Condition
Fair
inspected February 2024
Type
Frame
Concrete
Length
61 ft
1 main span
Daily traffic
14,870
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

HWY North Rotary over ST 99 Sullivan Sq Undrps is a concrete frame carrying HWY North Rotary over ST 99 Sullivan Sq Undrps in Suffolk County, Massachusetts. It was built in 1951, so it is 74 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 14,870 vehicles a day, roughly 9% of them trucks, projected to reach 44,220 by 2033. The structure is 61 ft (18.6 m) long and 65 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesHWY North Rotary
CrossesST 99 Sullivan Sq Undrps
Location1.6 KM N of N Wshngton ST
RouteCity Street 0
CountySuffolk County
StateMassachusetts
Coordinates42.38525, -71.07312
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 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 geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating42.4 US tons
Inventory rating25.5 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length61 ft (18.6 m)
Longest span61 ft (18.6 m)
Deck width65 ft (19.7 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,870 (2024)
Projected traffic44,220 by 2033
Trucks9%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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$3.6 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY North Rotary over ST 99 Sullivan Sq Undrps built?

It was built in 1951, making it 74 years old in 2025.

What condition is HWY North Rotary over ST 99 Sullivan Sq Undrps 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 February 2024.

How much traffic does HWY North Rotary over ST 99 Sullivan Sq Undrps carry?

About 14,870 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is HWY North Rotary over ST 99 Sullivan Sq Undrps?

The structure is 61 ft (18.6 m) long with a longest span of 61 ft (18.6 m) and a deck 65 ft wide.

Who owns HWY North Rotary over ST 99 Sullivan Sq Undrps?

It is owned by the City or Municipal Highway Agency.