Des Moines Mem DR over SR 99
FairKing County, Washington · 1.9 N JCT SR 599 · Structure no. 0006046A0000000
- Built
- 1959
- 66 years old
- Condition
- Fair
- inspected June 2023
- Type
- Slab
- Concrete Continuous
- Length
- 214 ft
- 4 main spans
- Daily traffic
- 11,989
- 2012 count
- Owner
- State
- State Highway Agency
About this bridge
Des Moines Mem DR over SR 99 is a concrete continuous slab carrying Des Moines Mem DR over SR 99 in King County, Washington. It was built in 1959, so it is 66 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 5 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 11,989 vehicles a day, roughly 5% of them trucks. The structure is 214 ft (65.2 m) long and 87 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Des Moines Mem DR over SR 99 built?
It was built in 1959, making it 66 years old in 2025.
What condition is Des Moines Mem DR over SR 99 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 June 2023.
How much traffic does Des Moines Mem DR over SR 99 carry?
About 11,989 vehicles per day (2012 count), of which roughly 5% are trucks.
How long is Des Moines Mem DR over SR 99?
The structure is 214 ft (65.2 m) long with a longest span of 61 ft (18.6 m) and a deck 87 ft wide.
Who owns Des Moines Mem DR over SR 99?
It is owned by the State Highway Agency.