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Every bridge in Iroquois County, Illinois

568 inventoried bridges, busiest first (page 2 of 2)

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Iroquois County, Illinois, has 568 bridges in the 2025 National Bridge Inventory: 258 rated good, 227 fair, and 83 poor (as of August 20, 2026).
This index lists every one of them, busiest first, 500 per page; each links to its own condition record.

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Bridge	Built	Vehicles/day	Condition
Tr 320 over Martinton Ditch #3	1955	25	Poor
Tr 320 over Martinton Ditch No 3	1981	25	Good
Tr 323 over Tr of Little Mud CR	2007	25	Good
Tr 336A over Drainage Ditch	1977	25	Good
Tr 338 over Coon CR	1981	25	Good
Tr 338 over Possum Trot Ditch	2008	25	Good
Tr 33C over Langan Creek	2005	25	Good
Tr 341 over Gay Creek	1967	25	Poor
Tr 345 over Spring Creek	2001	25	Good
Tr 351 over Pigeon Creek	2012	25	Good
Tr 351 over Trib to Pigeon CR	1961	25	Poor
Tr 351 over Trib to Pigeon Creek	2002	25	Good
Tr 352 over Stream	1981	25	Fair
Tr 353 over Fountain CR	1994	25	Good
Tr 353 over Pigeon Creek	1996	25	Good
Tr 353 over Whiskey Creek	1984	25	Fair
Tr 353A over Stream	1960	25	Fair
Tr 353B over Stream	2009	25	Good
Tr 357 over Spring CR Trib	1986	25	Good
Tr 360 over Stream	1976	25	Fair
Tr 368 over Beaver Creek	1983	25	Fair
Tr 374 over Coon Creek	1974	25	Fair
Tr 382 over Trib to Coon Creek	1982	25	Good
Tr 390A over Pike Creek	1983	25	Good
Tr 392 over Beaver Creek	1996	25	Good
Tr 392 over Trib Beaver Creek	2007	25	Good
Tr 41 over Drainage Ditch	2012	25	Good
Tr 422 over Beaver CR	1957	25	Fair
Tr 422 over Hooper Br	1957	25	Good
Tr 438 A over Beaver CR	1975	25	Fair
Tr 438A over Blackston Branch	2003	25	Good
Tr 450 over Coon Creek	1996	25	Good
Tr 452 over Stream	1977	25	Poor
Tr 452 over Unnamed Tributary	2004	25	Good
Tr 458 over Beaver CR	1971	25	Fair
Tr 49 B over Prairie CR	1904	25	Poor
Tr 551 over Trib to Spring Creek	1985	25	Good
Tr 57 over Langan CR	1981	25	Fair
Tr 58 over Langan Ck	1978	25	Good
Tr 58 over Prairie Creek	1989	25	Good
Tr 58 over Trib of Langan Crk.	1993	25	Fair
Tr 58 over W Br Langan Creek	1987	25	Fair
Tr 62 over Stream	1984	25	Fair
Tr 88A over Trib. to Little Mud	1996	25	Fair
Tr 89 over Prairie CR	1976	25	Poor
Tr 90 over Trib to Spring Creek	1981	25	Good
Tr 94A over Prairie Creek	2001	25	Good
Tr 94A over Trib. to Spring CR	1928	25	Poor
Tr 95 over Prairie CR	2005	25	Good
Tr 95 over Trib. Prairie CR	1973	25	Fair
Tr 96 over N Branch Langan Ck	2000	25	Good
Tr-199 over Creek	1990	25	Good
Tr-2e over Kult Ditch	1991	25	Good
Tr-33 over Creek	1991	25	Fair
Tr-353b over Creek	1990	25	Fair
Tr-49a over Br Prairie Creek	1994	25	Good
Tr-57 over Langan Creek	1989	25	Good
Tr-94a over Creek	1995	25	Good
Twp Rd 269 over I-57	1968	25	Fair
Twp Rd 95 over I 57	1967	25	Fair
Tr 10 B over Stream	1987	20	Good
Tr 10 B over Trib Spring CR	1978	20	Fair
Tr 10B MFT120 over Louis Creek	1962	20	Poor
Tr 180 over Whiskey Creek	1968	10	Fair
Tr 255A over Trib to Spring Creek	1973	10	Fair
Tr 256 over Gay Creek	1984	10	Good
Tr 314 over Coon Creek	1993	10	Good
Ms 6200 over Pigeon CR	2007	–	Fair

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Source: FHWA National Bridge Inventory, 2025.

Iroquois County bridge conditions · Illinois bridges by county.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.