Tr 20 over Senachwine Lake Trib
Putnam County, Illinois · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Tr 20 over Senachwine Lake Trib in Putnam County, Illinois, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1955 and reconstructed in 1980, making it 70 years old at the 2025 inventory.
- It carries about 50 vehicles a day (traffic count year 2023).
- Its listed owner is a town or township highway agency.
- It is one of 33 of the 50 inventoried bridges in Putnam County rated fair (66.0%); 3 (6.0%) are rated poor.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (41.16593, -89.39037)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Concrete channel beam |
| Length | about 23 ft |
| Location | 425N 395E |
| NBI structure number | 078300800000000 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Putnam County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Il 89 over Unnamed Stream | 2001 | 5,450 | Fair |
| Ill 71 over Drainage Ditch | 2015 | 4,700 | Good |
| Il 71 over Intermittent Stream | 2007 | 4,100 | Good |
| Ill 89 over Allforks Creek North | 2012 | 4,100 | Good |
| Ill 89 over Allforks Creek South | 2012 | 4,100 | Good |
| Ill 71 over Coffee Creek | 1977 | 3,600 | Fair |
All bridges nearby: Putnam County, IL bridge conditions · every bridge in Putnam County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.