Ill 100 over Seahorne Branch
FairFulton County, Illinois · 2.25 MI N Marbletown · Structure no. 029002300000000
- Built
- 1936
- 89 years old, rebuilt 1991
- Condition
- Fair
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 28 ft
- 1 main span
- Daily traffic
- 550
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Ill 100 over Seahorne Branch is a prestressed concrete stringer/multi-beam or girder carrying Ill 100 over Seahorne Branch in Fulton County, Illinois. It was built in 1936 and reconstructed in 1991, so it is 89 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 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 550 vehicles a day, roughly 20% of them trucks, projected to reach 682 by 2046. The structure is 28 ft (8.4 m) long and 43 ft wide. If it were closed, the detour would be 8.7 mi (14 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 | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ill 100 over Seahorne Branch built?
It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1991.
What condition is Ill 100 over Seahorne Branch 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 Ill 100 over Seahorne Branch carry?
About 550 vehicles per day (2023 count), of which roughly 20% are trucks.
How long is Ill 100 over Seahorne Branch?
The structure is 28 ft (8.4 m) long with a longest span of 26 ft (7.8 m) and a deck 43 ft wide.
Who owns Ill 100 over Seahorne Branch?
It is owned by the State Highway Agency.