C ST over US 101
GoodMason County, Washington · 2.8 S JCT SR 102 · Structure no. 0009361A0000000
- Built
- 1973
- 52 years old
- Condition
- Good
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 232 ft
- 2 main spans
- Daily traffic
- 1,270
- 2002 count
- Owner
- State
- State Highway Agency
About this bridge
C ST over US 101 is a prestressed concrete continuous stringer/multi-beam or girder carrying C ST over US 101 in Mason County, Washington. It was built in 1973, so it is 52 years old, older than the Washington average of 49.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 1,270 vehicles a day, roughly 10% of them trucks, projected to reach 2,350 by 2036. The structure is 232 ft (70.7 m) long and 29 ft wide. If it were closed, the detour would be 3.1 mi (5 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was C ST over US 101 built?
It was built in 1973, making it 52 years old in 2025.
What condition is C ST over US 101 in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.
How much traffic does C ST over US 101 carry?
About 1,270 vehicles per day (2002 count), of which roughly 10% are trucks.
How long is C ST over US 101?
The structure is 232 ft (70.7 m) long with a longest span of 110 ft (33.4 m) and a deck 29 ft wide.
Who owns C ST over US 101?
It is owned by the State Highway Agency.