Iroquois County, IL

565 public highway bridges

Iroquois County Bridge Snapshot

Iroquois County, Illinois contains 565 public highway bridges in the FHWA National Bridge Inventory. Roughly 46% are rated “Good,” 35.8% “Fair,” 13.3% “Poor,” and 13.3% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in IL are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

565
Total Bridges
46%
Good
13.3%
Poor
13.3%
Structurally Deficient

Condition Distribution

Good
46% (260)
Fair
35.8% (202)
Poor
13.3% (75)
SD
13.3% (75)

All Bridges (565)

TR 76A

Good

Over: TRIB. TO LITL MUD CR

4M W .5M S CISSNA PK, Iroquois, IL

Built 1993 Load: 32.4 t ADT: 50

TR 86

Good

Over: TRIB TO PIGEON CRK

5 S, 3.5 W CISSNA PK, Iroquois, IL

Built 1998 Load: 32.4 t ADT: 50

TR 351

Good

Over: TRIB TO PIGEON CREEK

1 S, 3.4 W CISSNA PK, Iroquois, IL

Built 2002 Load: 32.4 t ADT: 25

TR 351

Good

Over: PIGEON CREEK

1.5M S .5 M W Cissin, Iroquois, IL

Built 2012 Load: 32.4 t ADT: 25

FAS 328 CH 11

Good

Over: TRIB MUD CREEK

.5MI S WELLINGTON E1, Iroquois, IL

Built 1994 Load: 32.4 t ADT: 100

TR 336A

Good

Over: DRAINAGE DITCH

1.5 MI NE WELLINGTON, Iroquois, IL

Built 1977 Load: 32.4 t ADT: 25

TR 2E

Good

Over: UNNAMED STREAM

STATE LINEIMIS GREER, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 50

TR 353B

Good

Over: STREAM

1.5 E&.5 M N WELLING, Iroquois, IL

Built 2009 Load: 32.4 t ADT: 25

TR 10A

Good

Over: STREAM

2.0 MI W RIDGEVILLE, Iroquois, IL

Built 1982 Load: 32.4 t ADT: 25

TR 32

Good

Over: TRIB TO SPRING CREEK

3.75E,0.5N THAWVILLE, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 50

TR-199

Good

Over: Creek

1.5N, .5W RIDGELAND, Iroquois, IL

Built 1990 Load: 32.4 t ADT: 25

TR 199

Good

Over: PRAIRIE CREEK

.25 M E FORD-IROQ, Iroquois, IL

Built 1993 Load: 32.4 t ADT: 25

TR 231

Good

Over: UNNAMMED TRIB

SEC 29 T26N R10E 3RD, Iroquois, IL

Built 1996 Load: 32.4 t ADT: 50

TR 227

Good

Over: STREAM

.2 MI E. FORD-IROQ L, Iroquois, IL

Built 2006 Load: 32.4 t ADT: 75

TR 26A

Good

Over: TRIB TO SPRING CR

1.5 MI W DELREY, Iroquois, IL

Built 1998 Load: 32.4 t ADT: 75

TR 338

Good

Over: COON CR

5.4M S US24 ON TR338, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 25

TR 382

Good

Over: TRIB TO COON CREEK

0.6 MI SW OF DARROW, Iroquois, IL

Built 1982 Load: 32.4 t ADT: 25

TR 358

Good

Over: UNNAMED STREAM

SHEUAMI COUNTRY CLUB, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 175

TR 338

Good

Over: POSSUM TROT DITCH

2500E, 1350N, Iroquois, IL

Built 2008 Load: 32.4 t ADT: 25

TR 452

Good

Over: UNNAMED TRIBUTARY

SEE BELOW, Iroquois, IL

Built 2004 Load: 32.4 t ADT: 25

FAS 334 CH 9

Good

Over: MUD CREEK

3MI E,.5 N STOCKLAND, Iroquois, IL

Built 2008 Load: 32.4 t ADT: 200

TR 434

Good

Over: COON CREEK

5 MI N STOCKLAND, Iroquois, IL

Built 1979 Load: 32.4 t ADT: 50

TR 2D

Good

Over: SUGAR CREEK

STATE LN 1.5N MLFORD, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 50

TR 2E

Good

Over: MUD CREEK

3.5E, 0.5S STOCKLAND, Iroquois, IL

Built 1990 Load: 32.4 t ADT: 25

TR 2E

Good

Over: KULT DITCH

STOCKLAND TWP SEC30,, Iroquois, IL

Built 1991 Load: 32.4 t ADT: 25

TR-2E

Good

Over: Kult Ditch

STOCKLAND TWP., Iroquois, IL

Built 1991 Load: 32.4 t ADT: 25

TR 450

Good

Over: COON CREEK

SEC 1 T25N R10W 2ND, Iroquois, IL

Built 1996 Load: 32.4 t ADT: 25

TR 434

Good

Over: TRIB TO SUGAR CREEK

1.2 MI E OF CH41, Iroquois, IL

Built 1999 Load: 32.4 t ADT: 50

TR 251

Good

Over: COON CR

2.7M S 5M E WOODLAND, Iroquois, IL

Built 2008 Load: 32.4 t ADT: 75

TR 434

Good

Over: MUD CREEK

2M E 1M N STOCKLAND, Iroquois, IL

Built 2008 Load: 32.4 t ADT: 50

CITY ST.#6100

Good

Over: MCCUTCHEON DITCH

CRESCENT CITY, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 125

FAS 323,CH 40

Good

Over: COON CR

2.19 MI W OF IL 1, Iroquois, IL

Built 1991 Load: 33.4 t ADT: 650

TR 331A

Good

Over: DITCH

3.7 MI E OF ILL 1, Iroquois, IL

Built 2021 Load: 33.7 t ADT: 75

TR 22C

Good

Over: TRIB SPRING CR

1MI S ILL 54, Iroquois, IL

Built 1976 Load: 34.3 t ADT: 50

US 52

Good

Over: MARTINTON DITCH NO 3

2.55 MI E OF IL 1, Iroquois, IL

Built 2015 Load: 35.0 t ADT: 1,700

TR 188

Good

Over: PRAIRIE CR

2 MI E L'ERABLE, Iroquois, IL

Built 1975 Load: 35.0 t ADT: 50

CH 4 OVER PIKE CR

Good

Over: PIKE CREEK

3.25 MI W SBI 1, Iroquois, IL

Built 2022 Load: 35.0 t ADT: 425

FAS 326 BRYCE RD

Good

Over: JEFFERSON CREEK

1.04 MI S OF FAS 323, Iroquois, IL

Built 1988 Load: 35.3 t ADT: 475

US 24

Good

Over: DRAINAGE DITCH

.05 MILE E OF ILL 49, Iroquois, IL

Built 1994 Load: 35.3 t ADT: 4,500

FAS 329 CH-10

Good

Over: TRIB. PIGEON CR

1.39 MI E OF ILL 49, Iroquois, IL

Built 1985 Load: 35.3 t ADT: 500

IL 49 FAP 840

Good

Over: Drainage Ditch

0.48 Mi N of US 24, Iroquois, IL

Built 2015 Load: 36.0 t ADT: 2,300

TR 371A

Good

Over: TRIB TO GAY CREEK

0.5 MI W RTE 1, Iroquois, IL

Built 1983 Load: 36.0 t ADT: 50

US 45-52/FAP 840

Good

Over: Drainage Ditch

0.30 mi S of K3 Co, Iroquois, IL

Built 2013 Load: 36.3 t ADT: 3,650

TR 353

Good

Over: PIGEON CREEK

SEC 7 T24N R13W 2ND, Iroquois, IL

Built 1996 Load: 36.3 t ADT: 25

FAS327-CH41

Good

Over: POSSUM TROT DITCH

3.8MI S,US24, Iroquois, IL

Built 1994 Load: 36.3 t ADT: 325

CH 4

Good

Over: BRANCH OF LANGAN CRK

6 MI E. OF FORD CO., Iroquois, IL

Built 1992 Load: 36.9 t ADT: 150

TR 159B (WAS OR 7)

Good

Over: DRAINAGE DITCH

0.81 MI NWOF US 24, Iroquois, IL

Built 1986 Load: 36.9 t ADT: 275

TR 44

Good

Over: PRAIRE CREEK

2.25MI NW GILMAN, Iroquois, IL

Built 1954 Load: 37.3 t ADT: 75

FAS 329/CH 10

Good

Over: WHISKY CREEK

2.95 MI E.OF IL 49, Iroquois, IL

Built 1999 Load: 37.3 t ADT: 500

TR 286

Good

Over: LITTLE BEAVER CREEK

1.75 mi S of St.Anne, Iroquois, IL

Built 2020 Load: 37.3 t ADT: 275

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial