Old HWY 99 over Prairie Creek
GoodThurston County, Washington · 1. S JCT I-5 · Structure no. 088277000000000
- Built
- 2010
- 15 years old
- Condition
- Good
- inspected June 2023
- Type
- Slab
- Prestressed Concrete
- Length
- 63 ft
- 1 main span
- Daily traffic
- 11,240
- 2021 count
- Owner
- County
- County Highway Agency
About this bridge
Old HWY 99 over Prairie Creek is a prestressed concrete slab carrying Old HWY 99 over Prairie Creek in Thurston County, Washington. It was built in 2010, so it is 15 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 11,240 vehicles a day, roughly 20% of them trucks, projected to reach 17,377 by 2043. The structure is 63 ft (19.2 m) long and 79 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Old HWY 99 over Prairie Creek built?
It was built in 2010, making it 15 years old in 2025.
What condition is Old HWY 99 over Prairie 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 June 2023.
How much traffic does Old HWY 99 over Prairie Creek carry?
About 11,240 vehicles per day (2021 count), of which roughly 20% are trucks.
How long is Old HWY 99 over Prairie Creek?
The structure is 63 ft (19.2 m) long with a longest span of 60 ft (18.3 m) and a deck 79 ft wide.
Who owns Old HWY 99 over Prairie Creek?
It is owned by the County Highway Agency.