US 101 over Mill Creek
GoodMason County, Washington · 4.9 S JCT SR 102 · Structure no. 0009361D0000000
- Built
- 1973
- 52 years old
- Condition
- Good
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 153 ft
- 3 main spans
- Daily traffic
- 19,397
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 101 over Mill Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying US 101 over Mill Creek 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 19,397 vehicles a day, roughly 6% of them trucks, projected to reach 26,242 by 2039. The structure is 153 ft (46.6 m) long and 43 ft wide. If it were closed, the detour would be 13 mi (21 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 101 over Mill Creek built?
It was built in 1973, making it 52 years old in 2025.
What condition is US 101 over Mill Creek 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 November 2023.
How much traffic does US 101 over Mill Creek carry?
About 19,397 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is US 101 over Mill Creek?
The structure is 153 ft (46.6 m) long with a longest span of 61 ft (18.6 m) and a deck 43 ft wide.
Who owns US 101 over Mill Creek?
It is owned by the State Highway Agency.