Trosper RD over I-5
FairThurston County, Washington · 3.5 N JCT SR 121 · Structure no. 0013692A0000000
- Built
- 1991
- 34 years old, rebuilt 2003
- Condition
- Fair
- inspected September 2023
- Type
- Box Beam or Girders - Single or Spread
- Prestressed Concrete Continuous
- Length
- 242 ft
- 2 main spans
- Daily traffic
- 21,420
- 2012 count
- Owner
- State
- State Highway Agency
About this bridge
Trosper RD over I-5 is a prestressed concrete continuous box beam or girders - single or spread carrying Trosper RD over I-5 in Thurston County, Washington. It was built in 1991 and reconstructed in 2003, so it is 34 years old, younger 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 21,420 vehicles a day, roughly 5% of them trucks, projected to reach 35,300 by 2036. The structure is 242 ft (73.8 m) long and 73 ft wide. If it were closed, the detour would be 1.9 mi (3 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Trosper RD over I-5 built?
It was built in 1991, making it 34 years old in 2025. It was reconstructed in 2003.
What condition is Trosper RD over I-5 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 September 2023.
How much traffic does Trosper RD over I-5 carry?
About 21,420 vehicles per day (2012 count), of which roughly 5% are trucks.
How long is Trosper RD over I-5?
The structure is 242 ft (73.8 m) long with a longest span of 124 ft (37.8 m) and a deck 73 ft wide.
Who owns Trosper RD over I-5?
It is owned by the State Highway Agency.