HWY Chelsea ST over Water Little Mystic Chan
FairSuffolk County, Massachusetts · Under Tobin at Moran Term · Structure no. B163842CQMUNNBI
- Built
- 1982
- 43 years old
- Condition
- Fair
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 383 ft
- 3 main spans
- Daily traffic
- 4,008
- 2023 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
HWY Chelsea ST over Water Little Mystic Chan is a steel continuous stringer/multi-beam or girder carrying HWY Chelsea ST over Water Little Mystic Chan in Suffolk County, Massachusetts. It was built in 1982, so it is 43 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 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 4,008 vehicles a day, roughly 18% of them trucks, projected to reach 6,001 by 2032. The structure is 383 ft (116.7 m) long and 41 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 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was HWY Chelsea ST over Water Little Mystic Chan built?
It was built in 1982, making it 43 years old in 2025.
What condition is HWY Chelsea ST over Water Little Mystic Chan 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 October 2023.
How much traffic does HWY Chelsea ST over Water Little Mystic Chan carry?
About 4,008 vehicles per day (2023 count), of which roughly 18% are trucks.
How long is HWY Chelsea ST over Water Little Mystic Chan?
The structure is 383 ft (116.7 m) long with a longest span of 147 ft (44.8 m) and a deck 41 ft wide.
Who owns HWY Chelsea ST over Water Little Mystic Chan?
It is owned by the City or Municipal Highway Agency.