Lake County Bridge Report Card
Lake County scores 76 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Lake County, Illinois
Lake County has 250 bridges in the National Bridge Inventory, with 24 rated poor and 3 rated scour-critical. Its poor-condition share of 9.6% is above the 9.5% statewide average. Poor-condition bridges carry about 78,685 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Lake County a Bridge Condition Exposure Score of 76/100 (C). The county has 250 bridges in the National Bridge Inventory, including 24 in poor condition and 3 rated scour-critical. Poor-condition bridges carry about 78,685 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.
How the Score Breaks Down
| Factor | Weight | County Value | Penalty |
|---|---|---|---|
| Poor-condition bridge share | 40 | 9.6% | 19.2 |
| Poor-condition traffic exposure | 25 | 2.4% of measured traffic | 1.8 |
| Scour-critical bridge share | 20 | 1.2% | 2.4 |
| Average age vs national baseline | 10 | 49 years vs 48 nationally | 0.3 |
| Traffic-data completeness | 5 | 3,341,310 measured daily crossings | 0.0 |
Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.
County Comparisons
| County Poor-Condition Share | 9.6% |
| State Poor-Condition Share | 9.5% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 1.2% |
| Average Bridge Age | 49 years |
| Poor-Condition Traffic Exposure | 78,685 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Lake County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| US 14 over Flint Creek Trib | Poor condition + traffic exposure | Poor | 24,300 | 1937 |
| Washington ST over Rr - Up | Poor condition + traffic exposure | Poor | 16,400 | 1961 |
| Green Bay Rd. over U.p.r.r. | Poor condition + traffic exposure | Poor | 8,500 | 1988 |
| Dilleys Road over Mill Creek | Poor condition + traffic exposure | Poor | 5,600 | 2002 |
| Sheridan RD over Il 176 (scranton Rd) | Poor condition + traffic exposure | Poor | 4,300 | 1923 |
| Fau-1239 Rockland over Desplaines River | Poor condition + traffic exposure | Poor | 3,450 | 1990 |
| Deerfield Road over M F N Br Chicago Riv | Poor condition + traffic exposure | Poor | 3,100 | 1962 |
| Fau-1234 (oak Sp R over Des Plaines River | Poor condition + traffic exposure | Poor | 2,800 | 1967 |
| Genesee ST over Waukegan River | Poor condition + traffic exposure | Poor | 1,700 | 1913 |
| Tr-2601 Main ST over Squaw Creek | Poor condition + traffic exposure | Poor | 1,600 | 1900 |
Important safety note
Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.