Winnebago County, IL

475 public highway bridges

Winnebago County Bridge Snapshot

Winnebago County, Illinois contains 475 public highway bridges in the FHWA National Bridge Inventory. Roughly 27.8% are rated “Good,” 49.7% “Fair,” 6.1% “Poor,” and 6.1% 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.

475

Total Bridges

27.8%

Good

6.1%

Poor

6.1%

Structurally Deficient

Condition Distribution

Good

27.8% (132)

Fair

49.7% (236)

Poor

6.1% (29)

SD

6.1% (29)

All Bridges (475)

Sort:

ILL 251 S B

Over: ROCKTON ROAD

2.6 MI S ILL 75, Winnebago, IL

Built 1967 ADT: 12,400

ILL 251 N B

Over: ROCKTON ROAD

2.6 MI S ILL 75, Winnebago, IL

Built 1967 ADT: 9,150

US RT 20 WB

Over: US 20BR EB

3 MI W OF ROCKFORD, Winnebago, IL

Built 1961 ADT: 5,350

US 20 WB

Over: CUNNINGHAM RD.

1 MI E MERIDIAN RD, Winnebago, IL

Built 1964 ADT: 1,850

US 20 EB

Over: CUNNINGHAM RD.

1 MI E MERIDIAN RD, Winnebago, IL

Built 1964 ADT: 1,850

US 20 WB

Over: PRAIRIE RD

1 MI W OF ILL 2, Winnebago, IL

Built 1964 ADT: 1,550

US 20 EB

Over: PRAIRIE RD

1 MI W OF ILL 2, Winnebago, IL

Built 1964 ADT: 1,550

US 20 E B

Over: SIMPSON RD

0.8 MI W OF ILL 2, Winnebago, IL

Built 1964 ADT: 700

US 20 W B

Over: SIMPSON RD

0.8 MI W OF ILL 2, Winnebago, IL

Built 1964 ADT: 700

US 20 E B

Over: KISHWAUKEE ST.

.8 MI W OF ILL 251, Winnebago, IL

Built 1960 ADT: 7,000

US 20 W B

Over: KISHWAUKEE ST.

.8 MI W OF ILL 251, Winnebago, IL

Built 1960 ADT: 7,000

US 20 E B

Over: ILL 251 (11TH ST)

S EDGE ROCKFORD, Winnebago, IL

Built 1960 ADT: 16,900

US 20 W B

Over: ILL 251 (11TH ST)

S EDGE ROCKFORD, Winnebago, IL

Built 1960 ADT: 16,500

I-39 NB

Over: HARRISON AVE

.6 MI S OF I-90, Winnebago, IL

Built 1963 ADT: 18,900

I-39 SB

Over: HARRISON AVE

.6 MI S OF I-90, Winnebago, IL

Built 1963 ADT: 17,700

MONTAGUE RD

Over: US RT 20

1.5 MI E MERIDIAN RD, Winnebago, IL

Built 1964 ADT: 20,400

MERIDIAN RD

Over: US RT 20

1 MI S OF RT 20BR, Winnebago, IL

Built 1964 ADT: 14,600

WELDON RD

Over: US RT 20

.2 MI S RT 20 BR, Winnebago, IL

Built 1961 ADT: 11,400

FOREST HILLS RD SB

Over: IL 251 NB

IN ROCKFORD, Winnebago, IL

Built 1971 ADT: 16,300

HONONEGAH ROAD

Over: ILL 2

IN ROCKTON, Winnebago, IL

Built 1966 ADT: 8,550

IL 2 S B

Over: SOO RR &OLD RIVER RD

0.3 M S HONONEGAH RD, Winnebago, IL

Built 1966 ADT: 3,000

ILL 2 N B

Over: SOO RR &OLD RIVER RD

0.3 M S HONONEGAH RD, Winnebago, IL

Built 1966 ADT: 3,000

MULFORD RD

Over: I-39 & US 20

.5 MI E OF US 51, Winnebago, IL

Built 1976 ADT: 50,900

I-39 OFF RAMP

Over: US 20 BYPASS

SW EDGE OF ROCKFORD, Winnebago, IL

Built 1981 ADT: 26,500

I-39 SB

Over: FAP 301(US20 BYPASS)

0.4 MI W OF MULFORD, Winnebago, IL

Built 1981 ADT: 26,500

I-39 RAMP

Over: LINDEN ROAD

.25 MI S OF US20, Winnebago, IL

Built 1981 ADT: 5,950

I-39 RAMP

Over: LINDEN RD

0.25 MI S OF US 20, Winnebago, IL

Built 1981 ADT: 5,950

I-39 NB

Over: LINDEN ROAD

0.25 MI S OF US 20, Winnebago, IL

Built 1981 ADT: 5,950

I-39 RAMP 389

Over: I-39 & US 51 SB

0.35 MI S OF US 20, Winnebago, IL

Built 1981 ADT: 25,200

I-39 & US 51 SB

Over: BLACKHAWK RD

1.75 MI S OF US 20, Winnebago, IL

Built 1981 ADT: 2,800

I-39 & US 51 NB

Over: BLACKHAWK ROAD

1.75 MI S OF US 20, Winnebago, IL

Built 1981 ADT: 2,800

TR 251-ROTARY RD

Over: I-39 & US 51

1.5 MI N OF OGLE CO, Winnebago, IL

Built 1980 ADT: 29,000

FAS1045-BAXTER RD

Over: I-39 & US 51

1.0 MI N OF OGLE CO, Winnebago, IL

Built 1980 ADT: 29,000

ALPINE ROAD

Over: US 20 BY-PASS

SOUTH EDGE ROCKFORD, Winnebago, IL

Built 1984 ADT: 30,400

PRAIRIE HILL RD

Over: I-90

2 MI S WISCONSIN LN, Winnebago, IL

Built 2000 ADT: 51,000

US 51 & IL 75

Over: I-90

E. EDGE SOUTH BELOIT, Winnebago, IL

Built 2000 ADT: 51,000

US 20 E B

Over: ILL 2

1 MI S OF ROCKFORD, Winnebago, IL

Built 2019 ADT: 15,500

US 20 W B

Over: ILL 2

1 MI S OF ROCKFORD, Winnebago, IL

Built 2019 ADT: 15,500

20TH ST

Over: US 20

0.7 MI E OF ILL 251, Winnebago, IL

Built 2021 ADT: 36,000

ILL 251

Over: SPRING CREEK RD

1.4 MI N WHITMAN ST, Winnebago, IL

Built 2012 ADT: 27,600

PERRYVILLE ROAD

Over: I-39

.75 S HARRISON AVE, Winnebago, IL

Built 2023 ADT: 50,900

LINDEN RD

Over: I 39 SB RAMP

OVER 39 SB RAMP, Winnebago, IL

Built 2023 ADT: 5,950

ALPINE RD

Over: FOREST HILLS RD

0.2 MI S WINDSOR RD, Winnebago, IL

Built 1972 ADT: 11,200

JEFFERSON ST

Over: ROCK RIV& MADISON ST

0.1 MI E OF N MAIN, Winnebago, IL

Built 1925 ADT: 2,700

WHITMAN ST

Over: MADISON ST & RR

0.25 MI E OF MAIN ST, Winnebago, IL

Built 1961 ADT: 3,100

N 2ND ST

Over: WHITMAN ST

WHITMAN INTERCHANGE, Winnebago, IL

Built 1963 ADT: 7,900

N 3RD ST EXT TO 2N

Over: SB RAMP TO N 6TH ST

WHITMAN INTERCHANGE, Winnebago, IL

Built 1963 ADT: 6,000

I-90 S B

Over: BURR OAK RD

1 MI E OF ROSCOE, Winnebago, IL

Built 1958 ADT: 1,850

I-90 N B

Over: BURR OAK RD

1 MI E OF ROSCOE, Winnebago, IL

Built 1958 ADT: 1,850

I-90 RAMP

Over: I-90

.25 MI N OF 20 BR, Winnebago, IL

Built 1958 ADT: 70,600

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