Bridge conditions in Lake County, Illinois
250 inventoried bridges · 24 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 250 bridges in Lake County: 76 rated good, 150 fair, and 24 poor.
- 24 of the 250 bridges in Lake County, Illinois, are rated in poor condition (9.6%) in the 2025 National Bridge Inventory, as of .
- 76 bridges (30.4%) are rated good and 150 (60.0%) fair.
- The median Lake County bridge was built in 1979.
- The busiest poor-rated bridge is US 14 over Flint Creek Trib (built 1937), carrying about 24,300 vehicles a day.
Good 30.4% · Fair 60.0% · Poor 9.6% of 250 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-94 (tri State) over W.f.n. Br. Chi. Riv | 1958 | 82,800 | Fair |
| Interstate 94 SB over E J & E RR | 1958 | 72,350 | Fair |
| Interstate 94 NB over E J & E RR | 1958 | 72,350 | Fair |
| I-94 SB over C M S P & P RR | 1958 | 67,600 | Fair |
| I-94 NB over Cmsp & P RR | 1958 | 67,600 | Fair |
| Tri-state I-294 over Deerfield Rd/rmp F | 2001 | 58,950 | Good |
| I-94 SB over Washington Street | 1958 | 51,150 | Fair |
| I-94 NB over Washington Street | 1958 | 51,150 | Fair |
| I-94 SB over Des Plaines River | 1958 | 47,800 | Fair |
| I-94 NB over Des Plaines River | 1958 | 47,800 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
Every bridge in Lake County → - all 250, busiest first, each with its own condition record.
All of Illinois: Illinois bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.