Arsenal RD over Sylvan Slough
FairPosted for loadRock Island County, Illinois · Viaduct Ri Arsenal · Structure no. 000000000819904
- Built
- 1906
- 119 years old, rebuilt 1967
- Condition
- Fair
- inspected August 2024
- Type
- Girder and Floorbeam System
- Steel
- Length
- 603 ft
- 8 main spans
- Daily traffic
- 8,900
- 2022 count
- Owner
- Federal
- Army
About this bridge
Arsenal RD over Sylvan Slough is a steel girder and floorbeam system carrying Arsenal RD over Sylvan Slough in Rock Island County, Illinois. It was built in 1906 and reconstructed in 1967, so it is 119 years old, older than the Illinois average of 45.3 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. Its operating status is: posted for load restriction.
It carries about 8,900 vehicles a day, roughly 5% of them trucks, projected to reach 9,600 by 2046. The structure is 603 ft (183.9 m) long and 33 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Arsenal RD over Sylvan Slough built?
It was built in 1906, making it 119 years old in 2025. It was reconstructed in 1967.
What condition is Arsenal RD over Sylvan Slough 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 August 2024.
How much traffic does Arsenal RD over Sylvan Slough carry?
About 8,900 vehicles per day (2022 count), of which roughly 5% are trucks.
How long is Arsenal RD over Sylvan Slough?
The structure is 603 ft (183.9 m) long with a longest span of 84 ft (25.5 m) and a deck 33 ft wide.
Who owns Arsenal RD over Sylvan Slough?
It is owned by the Army.