US 1 Sb/Uppr Deck over US 1 Nb/Chel Lwr Deck
PoorSuffolk County, Massachusetts · Chel Appr UP · Structure no. B160174X0DOTNBI
- Built
- 1950
- 75 years old
- Condition
- Poor
- inspected November 2023
- Type
- Girder and Floorbeam System
- Steel
- Length
- 3,349 ft
- 36 main spans
- Daily traffic
- 41,655
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 1 Sb/Uppr Deck over US 1 Nb/Chel Lwr Deck is a steel girder and floorbeam system carrying US 1 Sb/Uppr Deck over US 1 Nb/Chel Lwr Deck 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 41,655 vehicles a day, roughly 9% of them trucks, projected to reach 45,800 by 2032. The structure is 3,349 ft (1,020.8 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 | 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 | 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 Sb/Uppr Deck over US 1 Nb/Chel Lwr Deck built?
It was built in 1950, making it 75 years old in 2025.
What condition is US 1 Sb/Uppr Deck over US 1 Nb/Chel Lwr Deck 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 Sb/Uppr Deck over US 1 Nb/Chel Lwr Deck carry?
About 41,655 vehicles per day (2023 count), of which roughly 9% are trucks.
How long is US 1 Sb/Uppr Deck over US 1 Nb/Chel Lwr Deck?
The structure is 3,349 ft (1,020.8 m) long with a longest span of 103 ft (31.4 m) and a deck 42 ft wide.
Who owns US 1 Sb/Uppr Deck over US 1 Nb/Chel Lwr Deck?
It is owned by the State Highway Agency.