Prather Road SW over Chehalis River
GoodThurston County, Washington · 1.4 M W of Old HWY99 · Structure no. 083389000000000
- Built
- 1988
- 37 years old
- Condition
- Good
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 366 ft
- 3 main spans
- Daily traffic
- 620
- 2021 count
- Owner
- County
- County Highway Agency
About this bridge
Prather Road SW over Chehalis River is a prestressed concrete stringer/multi-beam or girder carrying Prather Road SW over Chehalis River in Thurston County, Washington. It was built in 1988, so it is 37 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 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 620 vehicles a day, roughly 15% of them trucks, projected to reach 958 by 2043. The structure is 366 ft (111.6 m) long and 36 ft wide. If it were closed, the detour would be 14.9 mi (24 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Prather Road SW over Chehalis River built?
It was built in 1988, making it 37 years old in 2025.
What condition is Prather Road SW over Chehalis River 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 Prather Road SW over Chehalis River carry?
About 620 vehicles per day (2021 count), of which roughly 15% are trucks.
How long is Prather Road SW over Chehalis River?
The structure is 366 ft (111.6 m) long with a longest span of 122 ft (37.2 m) and a deck 36 ft wide.
Who owns Prather Road SW over Chehalis River?
It is owned by the County Highway Agency.