South Thorp HWY over Light Ditch
FairKittitas County, Washington · 00.14 NW Robinson C · Structure no. 083945000000000
- Built
- 1936
- 89 years old, rebuilt 1978
- Condition
- Fair
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Concrete Continuous
- Length
- 30 ft
- 1 main span
- Daily traffic
- 1,972
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
South Thorp HWY over Light Ditch is a concrete continuous stringer/multi-beam or girder carrying South Thorp HWY over Light Ditch in Kittitas County, Washington. It was built in 1936 and reconstructed in 1978, so it is 89 years old, older than the Washington average of 49.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 1,972 vehicles a day, roughly 22% of them trucks, projected to reach 4,449 by 2038. The structure is 30 ft (9.1 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was South Thorp HWY over Light Ditch built?
It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1978.
What condition is South Thorp HWY over Light Ditch in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in November 2023.
How much traffic does South Thorp HWY over Light Ditch carry?
About 1,972 vehicles per day (2022 count), of which roughly 22% are trucks.
How long is South Thorp HWY over Light Ditch?
The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.
Who owns South Thorp HWY over Light Ditch?
It is owned by the County Highway Agency.