Tr 242 over Allens Grove Ditch
Mason County, Illinois · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Tr 242 over Allens Grove Ditch in Mason County, Illinois, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2024, making it 1 years old at the 2025 inventory.
- It carries about 50 vehicles a day (traffic count year 2024).
- Its listed owner is a town or township highway agency.
- It is one of 31 of the 86 inventoried bridges in Mason County rated good (36.0%); 3 (3.5%) are rated poor.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (40.29768, -89.71469)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 8 | Very good condition |
| Superstructure | 8 | Very good condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 47 ft |
| Location | 0.48 mi S US 136 |
| NBI structure number | 063371100000000 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Mason County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 136 / Il 29 over Main Ditch | 1958 | 2,500 | Fair |
| Ill 29 over Allens Grove Ditch | 1959 | 2,450 | Good |
| Fap 614 (il 78) over Ditch | 1978 | 2,250 | Fair |
| Il 29 over Sleepy Hollow Ditch | 1959 | 2,000 | Fair |
| Il 29 over Salt Creek | 2002 | 2,000 | Fair |
| Ill 78 over White Oak Creek | 1931 | 1,750 | Fair |
All bridges nearby: Mason County, IL bridge conditions · every bridge in Mason County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.