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Bridge conditions in Macoupin County, Illinois

240 inventoried bridges · 40 rated poor · 2025 National Bridge Inventory

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

Of the 240 Macoupin County bridges in the federal inventory, 40 carry a poor rating. That 16.7% share is roughly 2x the national average.

40 of the 240 bridges in Macoupin County, Illinois, are rated in poor condition (16.7%) in the 2025 National Bridge Inventory, as of August 20, 2026.
89 bridges (37.1%) are rated good and 111 (46.2%) fair.
The median Macoupin County bridge was built in 1977.
The busiest poor-rated bridge is Il 111 over Piasa Creek (built 1929), carrying about 4,200 vehicles a day.

Good 37.1% · Fair 46.2% · Poor 16.7% of 240 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
Il 111 over Piasa Creek	1929	4,200	Poor
Fas 736 over Girder Br	1919	2,650	Poor
Fas 0736 over Wood River	1932	1,900	Poor
Bunkr Hil Stuntn R over Paddock Creek	1980	1,250	Poor
Fas 732 over Otter Lake	1968	950	Poor
Staunton Bunkr Hil over Br. Sherrycreek	1970	900	Poor
Tr 395 over Fai 55	1973	650	Poor
9 Mi. Lane over Sugar Creek	1932	650	Poor
Ch 36 over E.fk. Otter Ck.	1959	450	Poor
Ch 29 over Cahaoka Creek	1975	350	Poor
Fas 1728 over Lake	2000	350	Poor
Fas 1737 over Joes Crk	1967	200	Poor
Tr 488 over Brush Crk	1955	200	Poor
Township Road 451 over Girder CR	1900	200	Poor
Ch 11 over Massa Creek	1940	150	Poor
Tr 205 over Creek	1965	150	Poor
Tr 429 over E Fk Wood R	1969	125	Poor
Old Il 4 over Hurricane Creek	1921	100	Poor
Tr 33 over Brush Crk.	1954	100	Poor
Tr 166 over Coop Br	1917	100	Poor
Tr 98 over Solomon CR	1977	100	Poor
Tr 402 over Sugar CR	1900	100	Poor
Tr 189 over Anderson Branch	1900	100	Poor
Ch 34 over Solomon Crk.	1900	50	Poor
Tr 173 over Joe Creek	1916	50	Poor
Tr 130 over Lick Crk	1960	50	Poor
Tr 170 over Macoupin Crk	1900	50	Poor
Tr 307 over Coop Branch	1968	50	Poor
Tr 359 over Cahokia Creek	1900	50	Poor
Tr 359 over Cahokia Creek	1900	50	Poor
Township Road 151 over Creek	1981	50	Poor
Tr 352 over Creek	1991	50	Poor
Tr 285 over Honey Crk.	1900	35	Poor
Tr 498 over Creek	1900	35	Poor
Old Il 4 over Honey Creek	1920	20	Poor
Tr 13 over Sugar Creek	1900	20	Poor
Tr 253/CROSSCREEK over Shaw Pt Br	1900	20	Poor
Tr 496 over Horse Crk.	1916	20	Poor
Tr 424 over Honey Creek	1994	20	Poor
Tr 464 over Cahokia CR	2002	20	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
Fai 55 SB over Tr 439	1973	15,200	Fair
Fai 55 NB over Tr 439	1973	15,200	Fair
Ill 108 over Drainage Ditch	1933	6,950	Fair
Ill 4 over East Fork Creek	1957	4,800	Fair
Il 111 over Little Piasa Creek	1929	4,550	Fair
Il 111 over S Br Little Piasa CR	1929	4,550	Fair
Il 4 over Macoupin Creek	1960	4,450	Fair
Il 4 over Macoupin CR Trib	1960	4,450	Fair
Il 111 over Piasa Creek	1929	4,200	Poor
Il 111 over Piasa CR Branch	1930	4,200	Fair

Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.

Every bridge in Macoupin County → - all 240, busiest first, each with its own condition record.

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.