Bridge conditions in Marshall County, Illinois
155 inventoried bridges · 19 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Of the 155 Marshall County bridges in the federal inventory, 19 carry a poor rating. That 12.3% share is roughly 2x the national average.
- 19 of the 155 bridges in Marshall County, Illinois, are rated in poor condition (12.3%) in the 2025 National Bridge Inventory, as of .
- 65 bridges (41.9%) are rated good and 71 (45.8%) fair.
- The median Marshall County bridge was built in 1988.
- The busiest poor-rated bridge is Ill 18 over Ill River Cromwell Dr (built 1934), carrying about 2,200 vehicles a day.
Good 41.9% · Fair 45.8% · Poor 12.3% of 155 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 |
|---|---|---|---|
| Ill 18 over Ill River Cromwell Dr | 1934 | 2,200 | Poor |
| Ill 17 over Intermittent Stream | 1971 | 1,150 | Poor |
| Ill 117 over South Br Crow Creek | 1932 | 650 | Poor |
| Fas 2368 (ch-s51) over Sandy Creek | 1969 | 175 | Poor |
| Fas 2368 (ch-s51) over Judd Creek | 1969 | 175 | Poor |
| Elm Street over Gimlet Creek | 1982 | 100 | Poor |
| Ch 3 (ch-s42) over N Branch Crow Creek | 1959 | 75 | Poor |
| Tr 34 (th-s14) over Thenius Creek | 1964 | 75 | Poor |
| Tr 128 (th-s47) over N Branch Crow Creek | 1962 | 75 | Poor |
| Tr 34 (th-s14) over Creek | 1974 | 75 | Poor |
| Tr 3 (th-d19) over Stream | 1968 | 50 | Poor |
| Tr 17 (th-c57) over Little Sandy Creek | 1977 | 50 | Poor |
| Tr 134 (th-s53) over Judd Creek | 1974 | 50 | Poor |
| Tr 87 (th-d10) over N Branch Crow Creek | 1965 | 50 | Poor |
| Tr 76 (th-s28) over Snag Creek | 1935 | 50 | Poor |
| Tr 85 (th-c69) over Senachwine Creek | 1977 | 50 | Poor |
| Tr 95A (th-d12) over Senachwine Creek | 1977 | 50 | Poor |
| Tr 46 (th-s18) over Br Crow Creek | 1930 | 25 | Poor |
| Tr 53 (th-c63) over Senachwine Creek | 1967 | 25 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-39/US 51 over Stream | 1991 | 16,500 | Fair |
| I-39/US 51(SB) over N Fk Sandy Creek | 1990 | 8,250 | Fair |
| I-39/US 51(NB) over N Fk Sandy Creek | 1990 | 8,250 | Fair |
| I-39/US 51(SB) over Sandy Creek | 1990 | 8,250 | Fair |
| I-39/US 51(NB) over Sandy Creek | 1990 | 8,250 | Fair |
| I-39/US 51(SB) over Tr 39 (frtg Rd West) | 1991 | 8,250 | Fair |
| I-39/US 51(NB) over Tr 39 (frtg Rd West) | 1991 | 8,250 | Fair |
| I-39/US 51 SB over BNSF RR | 1989 | 8,000 | Fair |
| I-39/US 51 NB over BNSF RR | 1989 | 8,000 | Fair |
| Ill 17 over Ill River | 1939 | 7,000 | 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.