HWY Mishawum ST over ST 99 Sullivan Sq Undrps
PoorSuffolk County, Massachusetts · 1.6 KM N of N Wshngton ST · Structure no. B1624537UMUNNBI
- Built
- 1951
- 74 years old
- Condition
- Poor
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 73 ft
- 1 main span
- Daily traffic
- 2,845
- 2024 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
HWY Mishawum ST over ST 99 Sullivan Sq Undrps is a steel stringer/multi-beam or girder carrying HWY Mishawum ST 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: open, would be posted or closed except for temporary shoring.
It carries about 2,845 vehicles a day, roughly 9% of them trucks, projected to reach 9,318 by 2033. The structure is 73 ft (22.3 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was HWY Mishawum ST over ST 99 Sullivan Sq Undrps built?
It was built in 1951, making it 74 years old in 2025.
What condition is HWY Mishawum ST over ST 99 Sullivan Sq Undrps in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.
How much traffic does HWY Mishawum ST over ST 99 Sullivan Sq Undrps carry?
About 2,845 vehicles per day (2024 count), of which roughly 9% are trucks.
How long is HWY Mishawum ST over ST 99 Sullivan Sq Undrps?
The structure is 73 ft (22.3 m) long with a longest span of 67 ft (20.4 m) and a deck 55 ft wide.
Who owns HWY Mishawum ST over ST 99 Sullivan Sq Undrps?
It is owned by the City or Municipal Highway Agency.