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Bridge conditions in St. Clair County, Illinois

485 inventoried bridges · 45 rated poor · 2025 National Bridge Inventory

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

45 of the 485 bridges the federal inventory lists in St. Clair County are rated poor; the rest split 235 good and 205 fair.

45 of the 485 bridges in St. Clair County, Illinois, are rated in poor condition (9.3%) in the 2025 National Bridge Inventory, as of August 20, 2026.
235 bridges (48.5%) are rated good and 205 (42.3%) fair.
The median St. Clair County bridge was built in 1979.
The busiest poor-rated bridge is I-55/64; US 40 Psc over Trra (built 1966), carrying about 113,200 vehicles a day.

Good 48.5% · Fair 42.3% · Poor 9.3% of 485 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
I-55/64; US 40 Psc over Trra	1966	113,200	Poor
I-55/70;/64 over Csxrr Nsrr Trrarr	1959	66,500	Poor
Fai 255 over Ill 15	1981	44,300	Poor
I-255 over Nsrr	1980	41,500	Poor
Fai 255 over Ill 163	1980	41,500	Poor
I-55/70 & US 40 EB over Drainage Canal	1960	33,250	Poor
Fai 255 over Stolle Rd Fau 9208	1979	31,400	Poor
I-64 EB over Nsrr	1971	15,500	Poor
I-64 WB over Nsrr	1971	15,500	Poor
Il 111 over A&srr	1973	13,900	Poor
Ill 203 NB over Cahokia Canal	1960	13,500	Poor
Ill 203 SB over Cahokia Canal	1960	13,500	Poor
Ill 157 over Little Canteen Creek	1929	10,900	Poor
I-55/64 WB Cd R-li over UPRR	1969	10,000	Poor
Ill 159 over Douglas Creek	1954	9,400	Poor
Fau 9168 over Richland Creek	1966	8,950	Poor
203SB Rmp to 55/70 over Drng to Cahokia Cnl	1960	7,900	Poor
US 50 over Ch 50/SUMERFIELD Rd	1984	7,600	Poor
Ill 177 over Silver Cr Overflow W	1961	7,000	Poor
Ill 177 over Silver Cr Overflow E	1961	7,000	Poor
Ill 157 over Goose Lake Canal	1932	6,000	Poor
74TH St/ Fau 9253 over So RR 5 W Belleville	1955	5,450	Poor
Ill 15 & 4 over Kaskaskia River	1946	3,600	Poor
Il 111 over Csxrr (UPRR Kcsrr)	1935	2,750	Poor
Waterloo Rd/ Fas 8 over Gerhardt Creek	1961	1,850	Poor
Concordia Ch Rd/ch over Prairie Du Pont CR	1958	800	Poor
Forest BLVD(FAU915 over Schoenberger CR.	1949	775	Poor
Mud Creek Tr 308 over Mud Creek	1969	750	Poor
Werner Rd/ Fau 925 over Southern RR	1960	525	Poor
Ch 50 over Rayhill Slough	1954	475	Poor
Robinson Sch Rd/ch over Richland Creek	1993	400	Poor
Wagner Rd/ Tr 40 over Sparrow CR	1971	400	Poor
Reider Tr 222 over Engel Creek	1981	400	Poor
Press Rd/ Tr 197 over Richland Creek	1922	375	Poor
Five Forkse.rd/ch over Silver CR	1987	350	Poor
Plum Hill Tr 180 over Loop Creek	1980	350	Poor
Ch 68 over Mud Creek	1962	250	Poor
Otten Rd/ Tr 107 over Hickman Creek	1978	250	Poor
Haury Road over Ogles Creek	1995	200	Poor
Winter Rd Ch 49 over Doza Creek South	1901	175	Poor
Tr 298A over Rayhill Slough	1956	175	Poor
Emerald Mnd Rd/ch over Little Silver Creek	1960	125	Poor
N 89TH St over Creek	1965	75	Poor
Freeburg Twp.tr 20 over Drum Hill Br	1966	75	Poor
Black Quarter Tr 1 over Silver CR	1961	50	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
Psb I-55 64;US 40 over Mississippi River	1963	113,200	Fair
I-55/64; US 40 Psc over Trra	1966	113,200	Poor
I-55/64; US 40 EB over 4TH ST in E ST LOU	1965	105,300	Fair
EB 55/MLK Eb&wb Ap over 3RD ST EXIT to EStL	1961	105,300	Good
I-55/70;/64 over Csxrr Nsrr Trrarr	1959	66,500	Poor
I-55/64EB mainlne" over UPRR IL 3 ramp UPRR UPRR	1995	56,600	Fair
I-55/64; US 40 WB over Broadway & Metrolink	1965	52,650	Fair
I-55/64; US 40 EB over Broadway & Metrolink	1965	52,650	Fair
I-55/64; US 40 EB over Missouri Avenue	1965	52,650	Fair
I-55/64; US 40 EB over Ramps To/from Mlk Dr	1961	52,650	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 St. Clair County → - all 485, 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.