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)

Sort:

TR 62

Over: STREAM

4E,2N OF LODA, Iroquois, IL

Built 1984 Load: 32.4 t ADT: 25

TR 88A

Over: TRIB. TO LITTLE MUD

3 M W CISSNA PARK, Iroquois, IL

Built 1996 Load: 32.4 t ADT: 25

TR 347A

Over: TRIB MUD CREEK

2 MI. N 2.1 MIWGREER, Iroquois, IL

Built 1976 Load: 32.4 t ADT: 75

TR 352

Over: STREAM

.1 MI S CH 10, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 25

TR-353B

Over: Creek

1N, 3.25E GREER, Iroquois, IL

Built 1990 Load: 32.4 t ADT: 25

TR 372

Over: MUD CREEK

3.5 MI NE WELLINGTON, Iroquois, IL

Built 1997 Load: 32.4 t ADT: 50

TR 2A

Over: TRIB TO SPING CR

FORD-IROQ LINE, Iroquois, IL

Built 1976 Load: 32.4 t ADT: 50

TR 10 B

Over: TRIB SPRING CR

.5 M E .25THAWVILLE, Iroquois, IL

Built 1978 Load: 32.4 t ADT: 20

TR 10A

Over: STREAM

1.25 MI NE THAWVILLE, Iroquois, IL

Built 1982 Load: 32.4 t ADT: 25

TR 360

Over: STREAM

.25 MI S CH 40, Iroquois, IL

Built 1976 Load: 32.4 t ADT: 25

TR 191

Over: DRAINAGE DITCH

3 MI W SHELDON, Iroquois, IL

Built 1987 Load: 32.4 t ADT: 150

TR 185

Over: TRIB IROQUOIS RIVER

3.25W, 5S SHELDON, Iroquois, IL

Built 1989 Load: 32.4 t ADT: 75

TR225

Over: UNNAMED STREAM

2 MI S,1.5 E.SHELDON, Iroquois, IL

Built 1991 Load: 32.4 t ADT: 50

TR 331A

Over: TRIB SUGAR CREEK

2.7MI E CH4 ON CH 20, Iroquois, IL

Built 1976 Load: 32.4 t ADT: 75

TR 380 A

Over: SUGAR CREEK

.5 M N CH 9, Iroquois, IL

Built 1988 Load: 32.4 t ADT: 50

TR 380A

Over: TRIB OF SUGAR CREEK

.5N, 1W OF STOCKLAND, Iroquois, IL

Built 1990 Load: 32.4 t ADT: 50

TR 448

Over: UNNAMED TRIB

2 MI S. CH 10, Iroquois, IL

Built 1994 Load: 32.4 t ADT: 50

MS 6200

Over: PIGEON CR

0.5 MI E. CISSNA PK, Iroquois, IL

Built 2007 Load: 32.4 t

W CONCORD PLACE

Over: N SHELDON S CONCORD

W CONCORD PLACE, Iroquois, IL

Built 1985 Load: 32.4 t ADT: 50

TR 367

Over: SPRING CR

.3M S-.5M E OF LODA, Iroquois, IL

Built 1965 Load: 32.7 t ADT: 75

TR 255A

Over: TRIB TO SPRING CREEK

3 Mi. E.OF THAWVILLE, Iroquois, IL

Built 1973 Load: 32.7 t ADT: 10

TR 2 D

Over: Sheldon Ditch #1

0.3 Mi S of US 24, Iroquois, IL

Built 1900 Load: 33.0 t ADT: 75

TR 189

Over: BR OF SPRING CREEK

2MI E JCT45&24, Iroquois, IL

Built 1928 Load: 33.4 t ADT: 325

FAS 319 CH8

Over: TRIB VERMILION RIVER

2.5MI N SBI116 ONCH8, Iroquois, IL

Built 1940 Load: 33.4 t ADT: 350

FAS 325

Over: SUGAR CREEK

.75 MI SW WATSEKA, Iroquois, IL

Built 1974 Load: 34.0 t ADT: 1,300

TR 366

Over: TRIB SUGAR CREEK

0.02 MI S CH9, Iroquois, IL

Built 1980 Load: 34.0 t ADT: 75

FAI-57 SB

Over: Sugar Creek

0.96 MI S GILMAN INT, Iroquois, IL

Built 1967 Load: 35.0 t ADT: 8,200

FAI-57 NB

Over: Sugar Creek

0.95 MI S GILMAN INT, Iroquois, IL

Built 1967 Load: 35.0 t ADT: 8,200

TR 343A

Over: STREAM

.5 MI W IND. ST LINE, Iroquois, IL

Built 1965 Load: 35.0 t ADT: 50

CH 9/FAS 334

Over: TRIB OF SUGAR CREEK

1MI NW OF STOCKLAND, Iroquois, IL

Built 1997 Load: 35.0 t ADT: 100

US 52

Over: IROQUOIS RIVER

3.31 MI N OF US 24, Iroquois, IL

Built 1988 Load: 35.3 t ADT: 1,200

ILL 49

Over: BR PIGEON CREEK

2.4 MI N OF ILL 9, Iroquois, IL

Built 1990 Load: 35.3 t ADT: 1,050

TR 438 A

Over: BEAVER CR

.5 MI N CH3, Iroquois, IL

Built 1975 Load: 35.3 t ADT: 25

TR 454

Over: TRIB TO IROQUOIS RV

2 MI E OF IROQUOIS, Iroquois, IL

Built 1970 Load: 35.3 t ADT: 75

CH 30

Over: TRIB SPRING CREEK

2 MI W ILL49, Iroquois, IL

Built 1975 Load: 35.6 t ADT: 75

FAS 335 CH 10

Over: PIGEON CREEK

0.1 MI W RTE 49, Iroquois, IL

Built 1978 Load: 35.6 t ADT: 350

TR 225

Over: TRIB TO COON CREEK

2.0 S,1 W SHELDON, Iroquois, IL

Built 1974 Load: 35.6 t ADT: 50

TR 251C

Over: SHAVETAIL CREEK

1M E OF ILL 49, Iroquois, IL

Built 1973 Load: 36.0 t ADT: 500

CH 42

Over: TRIB SPRING CREEK

2.7MI N US24, Iroquois, IL

Built 1954 Load: 36.0 t ADT: 75

TR 363

Over: PIGEON CR

.2MI E ILL 49, Iroquois, IL

Built 1965 Load: 36.0 t ADT: 100

CH 42

Over: TRIB SPRING CREEK

2.1 MI N US 24, Iroquois, IL

Built 1972 Load: 36.6 t ADT: 75

FAS 321 CH4 SA 4

Over: DRAINAGE DITCH

3.08 MI W OF I-57, Iroquois, IL

Built 1986 Load: 36.9 t ADT: 325

TR 117

Over: DRAINAGE DITCH

1.0E 2.75N WATSEKA, Iroquois, IL

Built 1983 Load: 36.9 t ADT: 175

TR 302

Over: BEAVER CREEK

1.25E 1.25N PAPINEAU, Iroquois, IL

Built 1984 Load: 37.6 t ADT: 150

TR 317

Over: STREAM

1.6E,1.6S OF MILFORD, Iroquois, IL

Built 1983 Load: 37.6 t ADT: 50

ILL 1/FAP 332A

Over: SUGAR CREEK

2.73 M S OF US 24, Iroquois, IL

Built 1992 Load: 37.9 t ADT: 2,300

US 24

Over: DRAINAGE DITCH

3.1 MILES E OF US 45, Iroquois, IL

Built 1954 Load: 38.9 t ADT: 3,200

US 24

Over: TRIB PRAIRIE CREEK

3.74 MI W OF I-57, Iroquois, IL

Built 1987 Load: 38.9 t ADT: 2,300

ILL 49

Over: TRIB OF SHAVEYAIL CR

3.35 MI S OF US 24, Iroquois, IL

Built 1990 Load: 38.9 t ADT: 1,900

TR 250

Over: N MARTINTON DITCH 2

1 MI W OF MARTINTON, Iroquois, IL

Built 1981 Load: 38.9 t ADT: 50

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

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026