LaSalle County, IL

529 public highway bridges

LaSalle County Bridge Snapshot

LaSalle County, Illinois contains 529 public highway bridges in the FHWA National Bridge Inventory. Roughly 37.1% are rated “Good,” 39.7% “Fair,” 11.5% “Poor,” and 11.5% 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.

529

Total Bridges

37.1%

Good

11.5%

Poor

11.5%

Structurally Deficient

Condition Distribution

Good

37.1% (196)

Fair

39.7% (210)

Poor

11.5% (61)

SD

11.5% (61)

All Bridges (529)

Sort:

TWP RD TR 4

Over: FAI 80

9.12 MI W ILL 47, LaSalle, IL

Built 1960 ADT: 27,600

FAI-80 EB

Over: E 3rd Road (MS 6100A)

1.1 MI E JCT IL 251, LaSalle, IL

Built 1961 ADT: 950

FAI-80 WB

Over: E 3rd Road (MS 6100A)

1.1 MI E JCT IL 251, LaSalle, IL

Built 1961 ADT: 950

B. N. RR

Over: US 52 & ILL 251

0.51 MI S OF US 34, LaSalle, IL

Built 1936 ADT: 5,000

US 6/FAU 6088/FAP6

Over: ILL 251 FAP 46

JCT US 6 & ILL 251, LaSalle, IL

Built 1960 ADT: 9,700

BN RR

Over: ILL 23 (FAP68)

0.4 MI. N. OF US 34, LaSalle, IL

Built 1929 ADT: 1,300

ILL 251 (SB)

Over: I 80

JC ILL 251 & I-80, LaSalle, IL

Built 1961 ADT: 25,600

ILL 251 (NB)

Over: I 80

JCT IL 251 & I-80, LaSalle, IL

Built 1961 ADT: 25,600

IL 251

Over: IL RV/WATER ST/RR

0.1 MI S OF US 6, LaSalle, IL

Built 1958 ADT: 1,200

FAU6046 E18TH RD

Over: FAI 80

1.0 MI E OF ILL 23, LaSalle, IL

Built 1959 ADT: 27,400

CH 13 FAS 260

Over: I-80

3.2 ME JC 51 & I 80, LaSalle, IL

Built 1961 ADT: 28,400

CH 25/FAS 271

Over: FAI 80

4.5 MI E MARSEIL. RD, LaSalle, IL

Built 1960 ADT: 27,600

MS 6460 (E 6TH RD)

Over: FAI 80

4.4 MI E OF IL 251, LaSalle, IL

Built 1961 ADT: 30,700

TWP RD 170

Over: FAI 80

2.0 MI E OF ILL 178, LaSalle, IL

Built 1961 ADT: 29,300

TWP RD TR 244

Over: FAI 80

6.0 MI E OF ILL 178, LaSalle, IL

Built 1962 ADT: 29,300

TWP RD TR 284

Over: FAI 80

8.1 MI E OF ILL 178, LaSalle, IL

Built 1961 ADT: 29,300

TWP RD TR 366

Over: FAI 80

1.8 MI E OF ILL 71, LaSalle, IL

Built 1960 ADT: 25,100

TWP RD TR 416

Over: FAI 80

0.8 MI E MARSEILLES, LaSalle, IL

Built 1960 ADT: 27,600

TWP RD TR 434

Over: FAI 80

1.8 MI E MARSEIL RD, LaSalle, IL

Built 1960 ADT: 27,600

TWP RD TR 448

Over: FAI 80

3 MI E MARSEILLES RD, LaSalle, IL

Built 1960 ADT: 27,600

TWP RD TR 456

Over: FAI 80

3.9 MI E MARSEIL. RD, LaSalle, IL

Built 1960 ADT: 27,600

FAU 6087 SEVENTH S

Over: ILL 251

0.2 MI N OF US 6, LaSalle, IL

Built 1961 ADT: 9,700

FAS 269 (CH 12)

Over: FAI 39, US 51

3 MI N OF US 34, LaSalle, IL

Built 1977 ADT: 16,400

US 34 FAP 587

Over: I-39/US 51

INTCHG US 34 & 1-39, LaSalle, IL

Built 1977 ADT: 16,400

TR 105

Over: I-39/US 51

1 MI S OF US 34, LaSalle, IL

Built 1977 ADT: 18,700

US 52

Over: I-39/US 51

TROY GROVE, LaSalle, IL

Built 1977 ADT: 18,700

TR 205

Over: I-39/US 51

1 MI S OF US 52, LaSalle, IL

Built 1977 ADT: 18,600

FAS 1365 - CH 33

Over: I-39/US 51

3 MI N OF I-80, LaSalle, IL

Built 1977 ADT: 18,600

N 31ST RD (MS1998)

Over: I-39/US 51

1 MILE NORTH OF I-80, LaSalle, IL

Built 1977 ADT: 18,600

I-39NB/US 51NB

Over: I-80

2.55 MI W OF FAS 256, LaSalle, IL

Built 1979 ADT: 30,700

I-39 SB/US 51SB

Over: I-80

2.56 MI W OF FAS 256, LaSalle, IL

Built 1979 ADT: 30,700

CH 19 FAS 270

Over: I-39/US 51

2.3 MI N. of US 52, LaSalle, IL

Built 1971 ADT: 18,700

I-39, US 51

Over: IL RV/IL 351/ BO RR

2.82 MI S OF I-80, LaSalle, IL

Built 1984 ADT: 4,850

FAU 6124/N.29TH RD

Over: I-39/US 51

1.0 Mile S. of I-80, LaSalle, IL

Built 1985 ADT: 19,600

US 6 FAP 623

Over: I-39/US 51

2.74 MI E OF ILL 351, LaSalle, IL

Built 1986 ADT: 19,400

N. 2575TH/FAU 6126

Over: I-39/US 51

2.21 M1 S.OF US 6, LaSalle, IL

Built 1986 ADT: 19,400

FAU 6093 WALNUT ST

Over: I-39/US 51

.78 MI W /IL 71/351, LaSalle, IL

Built 1985 ADT: 19,400

ILL 71 FAP 619

Over: I-39/US 51

0.46 MI W OF IL 251, LaSalle, IL

Built 1988 ADT: 19,300

CH 54

Over: I-39/US 51

0.54 W OF IL 251, LaSalle, IL

Built 1988 ADT: 19,800

TR 483

Over: I-39/US 51

6.13 MI N OF IL 18, LaSalle, IL

Built 1989 ADT: 19,400

FAS 254 CH 5

Over: I-39/US 51

4.0 MI N OF IL 18, LaSalle, IL

Built 1988 ADT: 19,400

TR 513

Over: I-39/US 51

2.0 MI N OF IL 18, LaSalle, IL

Built 1988 ADT: 19,400

TR 525

Over: I-39/US 51

1.0 MI N OF IL 18, LaSalle, IL

Built 1988 ADT: 19,400

ILL 18 FAP 653

Over: I-39/US 51

0.48 MI W OF IL 251, LaSalle, IL

Built 1988 ADT: 19,400

IL 23/FAP 68

Over: I 80

ILL 23 AT OTTAWA, LaSalle, IL

Built 1993 ADT: 27,400

IL 71 FAP 311

Over: I-80

JUNCTION IL 71, LaSalle, IL

Built 1995 ADT: 25,100

FAS 268 A

Over: ILL RIV & OR 11

.41 M S OF US 6, LaSalle, IL

Built 1999 ADT: 325

FAS 1267/TERRA COT

Over: I 80

7.0 M E OF IL 178, LaSalle, IL

Built 1997 ADT: 29,300

MS 7430(LONE TREE

Over: I 80

1 MI E OF IL 178, LaSalle, IL

Built 1997 ADT: 29,300

I-80 WB

Over: FAU 6081 LASALLE RD

.8 MI E OF IL 251JCT, LaSalle, IL

Built 1996 ADT: 5,200

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 5, 2026