HWY Winthrop ST over Water Mystic River
PoorPosted for loadMiddlesex County, Massachusetts · 1.1 KM W of JCT I93&SR60 · Structure no. M120043F4DOTNBI
- Built
- 1926
- 99 years old
- Condition
- Poor
- inspected May 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 72 ft
- 3 main spans
- Daily traffic
- 13,500
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
HWY Winthrop ST over Water Mystic River is a concrete continuous tee beam carrying HWY Winthrop ST over Water Mystic River in Middlesex County, Massachusetts. It was built in 1926, so it is 99 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: posted for load restriction.
It carries about 13,500 vehicles a day, roughly 4% of them trucks, projected to reach 18,320 by 2032. The structure is 72 ft (21.9 m) long and 53 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was HWY Winthrop ST over Water Mystic River built?
It was built in 1926, making it 99 years old in 2025.
What condition is HWY Winthrop ST over Water Mystic River 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 May 2023.
How much traffic does HWY Winthrop ST over Water Mystic River carry?
About 13,500 vehicles per day (2024 count), of which roughly 4% are trucks.
How long is HWY Winthrop ST over Water Mystic River?
The structure is 72 ft (21.9 m) long with a longest span of 22 ft (6.7 m) and a deck 53 ft wide.
Who owns HWY Winthrop ST over Water Mystic River?
It is owned by the State Highway Agency.