US 1 Nb/Low Deck over HWY Chelsea Local Stre
PoorSuffolk County, Massachusetts · Chel Appr Low · Structure no. B160174WYDOTNBI
- Built
- 1950
- 75 years old
- Condition
- Poor
- inspected November 2023
- Type
- Girder and Floorbeam System
- Steel
- Length
- 2,829 ft
- 30 main spans
- Daily traffic
- 42,492
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
US 1 Nb/Low Deck over HWY Chelsea Local Stre is a steel girder and floorbeam system carrying US 1 Nb/Low Deck over HWY Chelsea Local Stre in Suffolk County, Massachusetts. It was built in 1950, so it is 75 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.
It carries about 42,492 vehicles a day, roughly 7% of them trucks, projected to reach 70,595 by 2032. The structure is 2,829 ft (862.3 m) long and 42 ft wide. If it were closed, the detour would be 5 mi (8 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 | 7 Good | Some minor problems. |
| 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 US 1 Nb/Low Deck over HWY Chelsea Local Stre built?
It was built in 1950, making it 75 years old in 2025.
What condition is US 1 Nb/Low Deck over HWY Chelsea Local Stre 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 November 2023.
How much traffic does US 1 Nb/Low Deck over HWY Chelsea Local Stre carry?
About 42,492 vehicles per day (2022 count), of which roughly 7% are trucks.
How long is US 1 Nb/Low Deck over HWY Chelsea Local Stre?
The structure is 2,829 ft (862.3 m) long with a longest span of 103 ft (31.4 m) and a deck 42 ft wide.
Who owns US 1 Nb/Low Deck over HWY Chelsea Local Stre?
It is owned by the State Highway Agency.