SR 18 over Cmstpp RR
GoodKing County, Washington · 0.6 E JCT SR 167 · Structure no. 0004896A0000000
- Built
- 1955
- 70 years old
- Condition
- Good
- inspected March 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 280 ft
- 6 main spans
- Daily traffic
- 50,541
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SR 18 over Cmstpp RR is a concrete continuous box beam or girders - multiple carrying SR 18 over Cmstpp RR in King County, Washington. It was built in 1955, so it is 70 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 50,541 vehicles a day, roughly 11% of them trucks, projected to reach 72,989 by 2039. The structure is 280 ft (85.3 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SR 18 over Cmstpp RR built?
It was built in 1955, making it 70 years old in 2025.
What condition is SR 18 over Cmstpp RR 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 March 2024.
How much traffic does SR 18 over Cmstpp RR carry?
About 50,541 vehicles per day (2023 count), of which roughly 11% are trucks.
How long is SR 18 over Cmstpp RR?
The structure is 280 ft (85.3 m) long with a longest span of 77 ft (23.5 m) and a deck 33 ft wide.
Who owns SR 18 over Cmstpp RR?
It is owned by the State Highway Agency.