Marshall County Bridge Report Card
Marshall County scores 72 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Marshall County, Illinois
Marshall County has 155 bridges in the National Bridge Inventory, with 19 rated poor and 1 rated scour-critical. Its poor-condition share of 12.3% is above the 9.5% statewide average. Poor-condition bridges carry about 5,150 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Marshall County a Bridge Condition Exposure Score of 72/100 (C). The county has 155 bridges in the National Bridge Inventory, including 19 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 5,150 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 | 12.3% | 24.5 |
| Poor-condition traffic exposure | 25 | 3.4% of measured traffic | 2.6 |
| Scour-critical bridge share | 20 | 0.6% | 1.3 |
| Average age vs national baseline | 10 | 41 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 150,995 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 | 12.3% |
| State Poor-Condition Share | 9.5% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.6% |
| Average Bridge Age | 41 years |
| Poor-Condition Traffic Exposure | 5,150 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Marshall County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Tr 46 (th-s18) over Br Crow Creek | Poor condition + traffic exposure | Poor | 25 | 1930 |
| Ill 18 over Ill River Cromwell DR | Poor condition + traffic exposure | Poor | 2,200 | 1934 |
| Ill 17 over Intermittent Stream | Poor condition + traffic exposure | Poor | 1,150 | 1971 |
| Ill 117 over South Br Crow Creek | Poor condition + traffic exposure | Poor | 650 | 1932 |
| Fas 2368 (ch-s51) over Sandy Creek | Poor condition + traffic exposure | Poor | 175 | 1969 |
| Fas 2368 (ch-s51) over Judd Creek | Poor condition + traffic exposure | Poor | 175 | 1969 |
| Elm Street over Gimlet Creek | Poor condition + traffic exposure | Poor | 100 | 1982 |
| Ch 3 (ch-s42) over N Branch Crow Creek | Poor condition + traffic exposure | Poor | 75 | 1959 |
| Tr 128 (th-s47) over N Branch Crow Creek | Poor condition + traffic exposure | Poor | 75 | 1962 |
| Tr 34 (th-s14) over Thenius Creek | Poor condition + traffic exposure | Poor | 75 | 1964 |
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.