Iroquois County, IL
565 public highway bridges
Iroquois County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Iroquois County, Illinois contains 565 public highway bridges. Roughly 46% are rated “Good,” 35.8% “Fair,” and 13.3% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.
Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.
Source: FHWA National Bridge Inventory. See methodology for full definitions.
Condition Distribution
All Bridges (565)
FAI-57 NB
UnknownOver: WEST SECOND ST
8.63 MI S ASHKUM INT, Iroquois, IL
FAI-57 SB
UnknownOver: WEST SECOND ST
8.6 MI S ASHKUM INT, Iroquois, IL
FAI-57 NB
UnknownOver: FAS 317 & ICG RR
0.78 MI S CLIFTON IN, Iroquois, IL
FAI-57 SB
UnknownOver: FAS 317 & ICG RR
0.78 M S CLIFTON INT, Iroquois, IL
CSX TRANS INC.
UnknownOver: IL 1/FAP 332A
N EDGE MILFORD RR BR, Iroquois, IL
US 24
UnknownOver: I 57
GILMAN INTERCHANGE, Iroquois, IL
ILL 54
UnknownOver: I 57
ONARGA INTERCHANGE, Iroquois, IL
DANFORTH RD FAS 33
UnknownOver: I-57
4.59 MI S OF ILL 116, Iroquois, IL
FAS 334 /C.H.9
UnknownOver: FAI 57
BUCKLEY INTERCHANGE, Iroquois, IL
FAS 335W/CH 10
UnknownOver: FAI 57
6.45 M S BUCKLEY INT, Iroquois, IL
CH 47 / 1200 N Rd
UnknownOver: FAI-57
2.62 MI S ONARGA INT, Iroquois, IL
TR 155
UnknownOver: I-57
2.0 Mi N of US 24, Iroquois, IL
CH 29
UnknownOver: I-57
3.0 M S OF CHEB INTR, Iroquois, IL
K3,BEAVERVILLE & S
UnknownOver: US 52
8.28 MI E OF ILL 1, Iroquois, IL
ILL 116 ASHKUM INT
UnknownOver: I 57
ASHKUM INTER, Iroquois, IL
TR 89
UnknownOver: I 57
2.47 MI S ASHKUM INT, Iroquois, IL
TR 26A
UnknownOver: I-57
7.11 MI S ONARGA INT, Iroquois, IL
TWP RD 35
UnknownOver: I 57
4.27 M S CHEBANSE IT, Iroquois, IL
TWP RD 49A
UnknownOver: I 57
1.59 MI S CLIFTON IN, Iroquois, IL
TR 58A
UnknownOver: I 57
1.17 MI S GILMAN INT, Iroquois, IL
TWP RD 95
UnknownOver: I 57
3.48 M S OF ILL 116, Iroquois, IL
TWP RD 109
UnknownOver: I 57
5.59 MI S ASHKUM INT, Iroquois, IL
TWP RD 269
UnknownOver: I-57
4.67 MI S ONARGA INT, Iroquois, IL
TWP RD 327
UnknownOver: FAI 57
1.07 MI S BUCKLEY IN, Iroquois, IL
TR 349
UnknownOver: FAI 57
4.1 M S BUCKLEY INTR, Iroquois, IL
FAS 321 (CH 4)
UnknownOver: I-57
CLIFTON INTER, Iroquois, IL
FAS 1322 (CH 37)
UnknownOver: I-57
CHEBANSE INT, Iroquois, IL
KB&S RR
UnknownOver: TR 91A
1.5MI SE DONOVAN, Iroquois, IL
TR 168
FairOver: WHISKEY CR
1.1 MI S. CH 10, Iroquois, IL
TR 251F
FairOver: JEFFERSON CREEK
3.3 MI S OF WOODLAND, Iroquois, IL
TR 312
FairOver: STREAM
2.5 MI E PITTWOOD, Iroquois, IL
TR 196
FairOver: TRIB. TO IROQ. RIVER
1MI S. SUGAR ISLANDE, Iroquois, IL
TR 345A
FairOver: TRIB TO SPRING CR
.5 MI E OF US 45, Iroquois, IL
TR 340
FairOver: IROQUOIS RIVER
1.25 MI N. US 24, Iroquois, IL
TR-343
FairOver: Trib. to Mud Creek
3 MI E. ILL RTE 1, Iroquois, IL
TR 28
FairOver: PRAIRIE CR
3 MI NW GILMAN, Iroquois, IL
TR 15
FairOver: TRIB LANGAN CREEK
1.8MI E CH8, Iroquois, IL
TR 99B
FairOver: MIDDLEPORT DITCH #1
1 MI E. ILL 1, Iroquois, IL
TR 100
FairOver: TRIB TO PIGEON CR
4.2MI S CH44, Iroquois, IL
FAS 1335 CH 42
FairOver: TRIB LITTLE MUD CR
1.2MI N JCT CH44+42, Iroquois, IL
TR 2C
FairOver: BEAVER CR
ILL-IND STATE LN, Iroquois, IL
TR 237
FairOver: DRAINAGE DITCH
3.5SE WOODLAND, Iroquois, IL
TR 2 D
FairOver: STREAM
0.2 Mi S of CR1400S, Iroquois, IL
TR 363A
FairOver: TRIB FOUNTAIN CR
3MI E FOUNTAIN CR, Iroquois, IL
CH 42
FairOver: SPRING CREEK
2.2MI S US24, Iroquois, IL
FAS 325
FairOver: DRAIN DT
2.91 MI S OF ILL 1, Iroquois, IL
TR 336A
FairOver: STREAM
3 MI SE MILFORD, Iroquois, IL
FAS 337
FairOver: TRIB SPRING CREEK
1MI E THAWVILLE, Iroquois, IL
FAS 329 CH 10 SA 1
FairOver: FOUNTAIN CREEK
5.06 MI E OF ILL 49, Iroquois, IL
CH 9 FAS 334
FairOver: SPRING CR
1 MI E JCT CH9 US45, Iroquois, IL
Read our methodology - how this data is sourced, computed, and verified.
Related
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.