LANCASTER/4100 over Downing Creek
FairWhitman County, Washington · 6.47 MI SW SR 23 · Structure no. 083998000000000
- Built
- 1966
- 59 years old
- Condition
- Fair
- inspected December 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 33 ft
- 1 main span
- Daily traffic
- 171
- 2021 count
- Owner
- County
- County Highway Agency
About this bridge
LANCASTER/4100 over Downing Creek is a prestressed concrete stringer/multi-beam or girder carrying LANCASTER/4100 over Downing Creek in Whitman County, Washington. It was built in 1966, so it is 59 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 171 vehicles a day, roughly 25% of them trucks, projected to reach 171 by 2044. The structure is 33 ft (10.1 m) long and 24 ft wide. If it were closed, the detour would be 39.1 mi (63 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 | 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 LANCASTER/4100 over Downing Creek built?
It was built in 1966, making it 59 years old in 2025.
What condition is LANCASTER/4100 over Downing Creek 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 December 2023.
How much traffic does LANCASTER/4100 over Downing Creek carry?
About 171 vehicles per day (2021 count), of which roughly 25% are trucks.
How long is LANCASTER/4100 over Downing Creek?
The structure is 33 ft (10.1 m) long with a longest span of 31 ft (9.6 m) and a deck 24 ft wide.
Who owns LANCASTER/4100 over Downing Creek?
It is owned by the County Highway Agency.