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.

565
Total Bridges
46%
Good
35.8%
Fair
13.3%
Poor Condition

Condition Distribution

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

All Bridges (565)

TR 97A

Good

Over: PIKE CREEK

2.5W 1.5N IROQUOIS, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 50

TR 390A

Good

Over: PIKE CREEK

2.5N 1.75W IROQUOIS, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 25

TR 442

Good

Over: IROQUOIS RIV TRIB

0.5 MI N OF US 24, Iroquois, IL

Built 1986 Load: 32.4 t ADT: 75

TR 348

Good

Over: PIKE CREEK

1.5N, 2W IROQUOIS, Iroquois, IL

Built 1989 Load: 32.4 t ADT: 75

TR-362A

Good

Over: Pike Creek

1.5MI N,CH31, Iroquois, IL

Built 1994 Load: 32.4 t ADT: 50

TR 163

Good

Over: TRIB TO IROQ. RIVER

1 MI N SHELDON, Iroquois, IL

Built 2002 Load: 32.4 t ADT: 50

TR 438A

Good

Over: BLACKSTON BRANCH

3.25 MI NE OF IROQ., Iroquois, IL

Built 2003 Load: 32.4 t ADT: 25

TR 141

Good

Over: TRIB TO IROQ RIVER

2 MI E US 52, Iroquois, IL

Built 2006 Load: 32.4 t ADT: 50

TR 161

Good

Over: Eastburn Hollow crk

3.5 Mi W&2.5Mi S Iro, Iroquois, IL

Built 2014 Load: 32.4 t ADT: 75

CH45

Good

Over: STREAM

2.81 MI S US 24, Iroquois, IL

Built 1977 Load: 32.4 t ADT: 50

TR 172

Good

Over: DRAINAGE DITCH

0.6 MI S CRESCENT C1, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 50

TR 219

Good

Over: SHAVETAIL CREEK

0.5 MI.W.ILL 49, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 25

TR 150A

Good

Over: SHAVETAIL CREEK

3.0S 1.25W CREST CTY, Iroquois, IL

Built 1984 Load: 32.4 t ADT: 25

TR 216

Good

Over: UNNAMED TRIB

2.6 MI-S,US 24, Iroquois, IL

Built 1993 Load: 32.4 t ADT: 50

TR 184 1600 E

Good

Over: Trib. to Sugar Creek

2 mi. E. of Cresent, Iroquois, IL

Built 2016 Load: 32.4 t ADT: 75

TR 243

Good

Over: DRAINAGE DITCH

1300N, 1410E, Iroquois, IL

Built 2001 Load: 32.4 t ADT: 50

FAS 332

Good

Over: DRAINAGE DITCH

SEC12 T27N R10E 3PM, Iroquois, IL

Built 1996 Load: 32.4 t ADT: 200

CH 42

Good

Over: Prairie Creek

3 mi. E. of Danforth, Iroquois, IL

Built 2014 Load: 32.4 t ADT: 75

CH 42

Good

Over: Prairie Creek Trib

1.25 mi. N. Danforth, Iroquois, IL

Built 2014 Load: 32.4 t ADT: 75

TR 104

Good

Over: TRIB TO SPRING CREEK

3 MI SE DANFORTH, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 25

TR 94A

Good

Over: PRAIRIE CREEK

1.4 MI SE DANFORTH, Iroquois, IL

Built 2001 Load: 32.4 t ADT: 25

TR 104

Good

Over: PRAIRIE CRK

2 MI E OF DANFORTH, Iroquois, IL

Built 1998 Load: 32.4 t ADT: 25

TR 95

Good

Over: PRAIRIE CR

5 MI N. OF LEONARD, Iroquois, IL

Built 2005 Load: 32.4 t ADT: 25

FAS 319/CH 8

Good

Over: PRAIRIE CREEK

2.35 MI N.OF US 24, Iroquois, IL

Built 1999 Load: 32.4 t ADT: 350

FAS 319/CH 8

Good

Over: PRAIRIE CREEK

1.5 N OF LAHOGUE, Iroquois, IL

Built 2000 Load: 32.4 t ADT: 350

CH 42

Good

Over: SPRING CREEK

4 M E OF GILMAN, Iroquois, IL

Built 2009 Load: 32.4 t ADT: 75

FAS 319 CH 8

Good

Over: PRAIRIE CREEK

.11 N US24 LAHOGUERD, Iroquois, IL

Built 2010 Load: 32.4 t ADT: 400

CH-42

Good

Over: Trib to Spring Creek

3.5 Miles E Gilman, Iroquois, IL

Built 2015 Load: 32.4 t ADT: 75

TR 10A

Good

Over: PRAIRIE CREEK

1.25S 1W LAHOGUE, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 25

TR 157

Good

Over: TRIB TO SPRING CREEK

2.5E 1.0N OF GILMAN, Iroquois, IL

Built 1984 Load: 32.4 t ADT: 75

TR 551

Good

Over: TRIB TO SPRING CREEK

3E 2N OF GILMAN, Iroquois, IL

Built 1985 Load: 32.4 t ADT: 25

TR 58

Good

Over: PRAIRIE CREEK

2.75 MI W GILMAN, Iroquois, IL

Built 1989 Load: 32.4 t ADT: 25

TR-94A

Good

Over: Creek

1 E ,1N OG GILMAN, Iroquois, IL

Built 1995 Load: 32.4 t ADT: 25

TR 189

Good

Over: SPRING CREEK

5.1MI E JCT45&24, Iroquois, IL

Built 2007 Load: 32.4 t ADT: 125

FAS 331/CH 45

Good

Over: DRAINAGE DITCH

6.4 MI W OF WELLNGTN, Iroquois, IL

Built 2001 Load: 32.4 t ADT: 150

TR 180

Good

Over: FOUNTAIN CREEK

.5MIW 1.5SFOUNTAIN C, Iroquois, IL

Built 1982 Load: 32.4 t ADT: 50

TR 359

Good

Over: FOUNTAIN CREEK

T24N,R13W,2ND PM, Iroquois, IL

Built 1991 Load: 32.4 t ADT: 75

TR 359

Good

Over: WHISKEY CR

4 MI SE CISSNA PARK, Iroquois, IL

Built 2006 Load: 32.4 t ADT: 75

TR 371

Good

Over: Fountain Creek

.1mi W&4.5mi S Clay, Iroquois, IL

Built 2014 Load: 32.4 t ADT: 50

TR 363

Good

Over: FOUNTAIN CREEK

0.17 MI E OF TR 180, Iroquois, IL

Built 2005 Load: 32.4 t ADT: 150

TR 363

Good

Over: FOUNTAIN CREEK

0.06 MI E OF FAS 331, Iroquois, IL

Built 2006 Load: 32.4 t ADT: 100

FAS 335 (CH 10)

Good

Over: PIGEON CREEK TRIB

3.0 MI. E. OF LODA, Iroquois, IL

Built 2003 Load: 32.4 t ADT: 400

FAS 335 (CH 10)

Good

Over: PIGEON CREEK TRIB.

2.5 MI. EAST OF LODA, Iroquois, IL

Built 2003 Load: 32.4 t ADT: 400

FAS 335 (CH 10)

Good

Over: PIGEON CREEK TRIB.

3.5 MI E OF LODA, Iroquois, IL

Built 2003 Load: 32.4 t ADT: 375

TR 349

Good

Over: SPRING CREEK

1.25 MI W INT 57, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 75

TR 357

Good

Over: SPRING CR TRIB

1.5E 1.0 N OF LODA, Iroquois, IL

Built 1986 Load: 32.4 t ADT: 25

TR 10 B

Good

Over: STREAM

1 M W, 2 M N LODA, Iroquois, IL

Built 1987 Load: 32.4 t ADT: 20

TR 349

Good

Over: UNNAMED TRIB

2 MI W. INT. 57, Iroquois, IL

Built 1992 Load: 32.4 t ADT: 75

TR 349

Good

Over: UNNAMED TRIB

1.75 M W INT 57, Iroquois, IL

Built 1992 Load: 32.4 t ADT: 75

TR 345

Good

Over: SPRING CREEK

1 MIL W US RTE 45, Iroquois, IL

Built 2001 Load: 32.4 t ADT: 25

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

Related

Browse all → | Rankings →
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

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.