Bridge conditions in LaSalle County, Illinois 528 inventoried bridges · 75 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions 2025 National Bridge Inventory, FHWA Compiled August 20, 2026
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 August 20, 2026 .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.
Every bridge in LaSalle County →
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 .