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.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 14 over Flint Creek Trib | 1937 | 24,300 | Poor |
| Washington St over RR - UP | 1961 | 16,400 | Poor |
| Green Bay Rd. over U.P.R.R. | 1988 | 8,500 | Poor |
| Dilleys Road over Mill Creek | 2002 | 5,600 | Poor |
| Sheridan Rd over Il 176 (scranton Rd) | 1923 | 4,300 | Poor |
| FAU-1239 Rockland over DesPlaines River | 1990 | 3,450 | Poor |
| Deerfield Road over M F N Br Chicago Riv | 1962 | 3,100 | Poor |
| Fau-1234 (oak Sp R over Des Plaines River | 1967 | 2,800 | Poor |
| Genesee St over Waukegan River | 1913 | 1,700 | Poor |
| TR-2601 Main St over Squaw Creek | 1900 | 1,600 | Poor |
| Sampson Street over Pettibone Creek | 1926 | 1,260 | Poor |
| Belvidere St over C&nw RR& L.f.f-way. | 1966 | 900 | Poor |
| Fredrickson Place over Skokie Ditch | 1985 | 900 | Poor |
| Thompson Avenue over Dead Dog Creek | 1955 | 650 | Poor |
| Vanpatten Woods Ro over Desplaines River | 1991 | 550 | Poor |
| Lake Road over Ravine | 1912 | 525 | Poor |
| Ringwood Road Sout over Ravine | 1913 | 475 | Poor |
| Market St-il 120RM over Unused Land | 1966 | 450 | Poor |
| Ms-4061 (beech St) over Ravine | 1957 | 300 | Poor |
| Ms-1130 (judson Av over Ravine | 1963 | 300 | Poor |
| Greenwood Ave over UPRR | 1972 | 250 | Poor |
| Walden Lane over Ravine | 1914 | 175 | Poor |
| Riverside Island D over Nippersink Lake | 1998 | 125 | Poor |
| Ms-1144 (wade St) over Ravine | 1963 | 75 | Poor |
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.
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.