Bridge conditions in LaSalle County, Illinois
528 inventoried bridges · 75 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
About one in 7 bridges in LaSalle County is rated in poor condition: 75 of 528 on the federal inventory, one of the higher shares in Illinois.
- 75 of the 528 bridges in LaSalle County, Illinois, are rated in poor condition (14.2%) in the 2025 National Bridge Inventory, as of .
- 198 bridges (37.5%) are rated good and 255 (48.3%) fair.
- The median LaSalle County bridge was built in 1982.
- The busiest poor-rated bridge is US 6 Fap 623 over Fox River (built 1928), carrying about 10,700 vehicles a day.
Good 37.5% · Fair 48.3% · Poor 14.2% of 528 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 6 Fap 623 over Fox River | 1928 | 10,700 | Poor |
| I-39 Sb/us 51SB over C & NW RR | 1977 | 9,350 | Poor |
| Ill 251 (SB) over I 80 | 1961 | 6,550 | Poor |
| Ill 23 Fap 68 over Covel Creek | 1953 | 5,550 | Poor |
| Ill 23 Fap 68 over Covel Creek | 1960 | 5,550 | Poor |
| Ill 170 over Ill Mich Canal | 1940 | 5,550 | Poor |
| Co Rd 15 over Walbridge Creek | 1971 | 4,700 | Poor |
| US 34 /fap 68 over Little Indian Creek | 1952 | 4,100 | Poor |
| Ebl of Ill 18 over Vermilion River | 1900 | 3,250 | Poor |
| US 6 over N. Kickapoo CR | 1980 | 2,850 | Poor |
| Ill 71 at Cedar Pt over Cedar Creek | 1929 | 2,250 | Poor |
| US 34 Fap 587 over Indian Creek | 1952 | 2,000 | Poor |
| US 52 over Fox River | 1931 | 1,850 | Poor |
| US 52 over Mission Creek | 1930 | 1,850 | Poor |
| Seneca ST#2300 over Stream | 1965 | 1,600 | Poor |
| Ch 23 Ext over Ill Central RR | 1942 | 1,600 | Poor |
| Or 2500 Utica Shor over Clark Run | 1976 | 1,400 | Poor |
| Ch 25/FAS 271 over Fai 80 | 1960 | 1,150 | Poor |
| FAS261 CH34 over Stream | 1961 | 1,000 | Poor |
| Ch 52 over Little Indian Creek | 1992 | 850 | Poor |
| Ms 7112/PREV TR375 over S. Kickapoocreek | 1987 | 775 | Poor |
| Post St over Goose CR | 1940 | 650 | Poor |
| Ms-7711 (glenn St) over Long Creek | 1964 | 525 | Poor |
| Tr 310 over Wolf Creek | 1964 | 400 | Poor |
| Mill Street over Clark Run Creek | 2002 | 400 | Poor |
| Twp Rd Tr 366 over Fai 80 | 1960 | 325 | Poor |
| Fas 269 (ch 12) over Fai 39 US 51 | 1977 | 325 | Poor |
| Tr 276 over Wolf Creek | 1965 | 325 | Poor |
| Water St/n 4550TH over Indian Creek | 1925 | 275 | Poor |
| Tr 535 over Praire Creek | 1974 | 275 | Poor |
| Tr 535 N 14TH Rd over Prairie Creek | 1980 | 275 | Poor |
| Tr-222 over Trib Indian CR | 1977 | 250 | Poor |
| Rockwell Rd over Vermilion River | 1940 | 250 | Poor |
| Tr-211 over L Vermillion river | 1963 | 200 | Poor |
| Co Rd 57 over Vermilion River | 1969 | 200 | Poor |
| Tr 277 over Unnamed Stream | 2001 | 200 | Poor |
| Tr 123 over Little Indian Creek | 1962 | 175 | Poor |
| Tr 203 over Spring Creek | 1977 | 175 | Poor |
| Washington St over Gum Creek | 1920 | 175 | Poor |
| Powell St. over Coal Run Creek | 1984 | 175 | Poor |
| Fas 174/CH 9 over Pecumsagan Creek | 1962 | 150 | Poor |
| Tr-48 over Bailey Creek | 1968 | 150 | Poor |
| Tr 48 over Bailey CR | 1984 | 150 | Poor |
| Kelly ST./ Van Bur over Prairie Creek | 1983 | 150 | Poor |
| Tr 225 over Spring Creek | 1965 | 125 | Poor |
| Union St over Gum CR | 1920 | 125 | Poor |
| Coal Street over Coal run Creek | 1984 | 125 | Poor |
| Monroe Street over Coal Run Creek | 1990 | 125 | Poor |
| Twp Rd Tr 4 over Fai 80 | 1960 | 100 | Poor |
| Tr-43 over Somonauk Creek | 1953 | 100 | Poor |
| Tr-282 over Covel Creek | 1966 | 100 | Poor |
| Tr-4 over Brush Creek | 1972 | 100 | Poor |
| Tr-20a over Spring Creek | 1977 | 100 | Poor |
| 10TH St over First CR | 1947 | 100 | Poor |
| MS6240 (indiana Av over Mendota CR | 1916 | 100 | Poor |
| Rd to Landfill over Ill Rv Back Water | 1932 | 75 | Poor |
| Fau 6166 over Eagle Creek | 1960 | 75 | Poor |
| Tr 232 over Crooked Leg Creek | 1961 | 50 | Poor |
| Tr 322 over Couel Creek | 1973 | 50 | Poor |
| Tr-359 A over Stream | 1971 | 50 | Poor |
| Tr-332 over Covel Creek | 1970 | 50 | Poor |
| Tr 75 N 4325TH over Indian CR | 1981 | 50 | Poor |
| Tr 454C over Hog Run Creek | 1996 | 50 | Poor |
| Tr 402 over Otter Creek | 1959 | 50 | Poor |
| Tr-2 Lasalle Rd over Waupecon CR | 1963 | 25 | Poor |
| Tr-112-a over Br Fourmile Grove CR | 1961 | 25 | Poor |
| Tr 128A over Tomahawk CR | 1963 | 25 | Poor |
| Tr 122 over Prairie CR | 1969 | 25 | Poor |
| Tr 354 over Covel Creek | 1973 | 25 | Poor |
| Tr 441 over Covel Creek | 1977 | 25 | Poor |
| Tr 158 over Tomahawk Creek | 1975 | 25 | Poor |
| Tr-18-a over Sandy Creek | 1963 | 10 | Poor |
| Tr-177 over Tomahawk Creek | 1964 | 10 | Poor |
| Tr-148 over Drainage Ditch | 1969 | 10 | Poor |
| Il 251/FAP 46 over I-39/US 51 | 1986 | – | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-80 EB & WB over Clark Run Creek | 2004 | 29,300 | Good |
| Ill 71 and Ill 23 over Il Rv & Acc Rd | 1981 | 22,900 | Fair |
| I-39 US 51 over Il Rv/il 351/ Bo RR | 1984 | 19,400 | Fair |
| I-39/US 51 over Conveyor Belt/pvt Rd | 1985 | 19,400 | Fair |
| I-39 over SE Half Conveyor B | 1961 | 19,400 | Fair |
| I-39 US 51 over Stream | 1989 | 19,400 | Good |
| US 51 I-39 over Stream | 1988 | 19,400 | Good |
| US 51 I-39 over Stream | 1988 | 19,400 | Good |
| Fai 39 US 51 over Stream | 1978 | 18,700 | Fair |
| Ill 23 Fap 68 over Goose CR | 1977 | 18,300 | Good |
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.