Macon County, IL

368 public highway bridges

Macon County Bridge Snapshot

Macon County, Illinois contains 368 public highway bridges in the FHWA National Bridge Inventory. Roughly 23.4% are rated “Good,” 44.3% “Fair,” 13% “Poor,” and 13% 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.

368

Total Bridges

23.4%

Good

13%

Poor

13%

Structurally Deficient

Condition Distribution

Good

23.4% (86)

Fair

44.3% (163)

Poor

13% (48)

SD

13% (48)

All Bridges (368)

Sort:

N&S RR

Over: US 51(FAP 710)

ON MAIN ST DECATUR, Macon, IL

Built 1934 ADT: 10,100

IC RR

Over: US 51(FAP 710)

S MAIN DECATUR, Macon, IL

Built 1933 ADT: 7,600

US-51 SB (FAP 710)

Over: IL 105(FAP 712)

IN DECATUR, Macon, IL

Built 1962 ADT: 1,900

US-51NB (FAP 710AL

Over: IL 105(FAP 712)

IN DECATUR, Macon, IL

Built 1963 ADT: 7,100

IC RR

Over: US 51(FAP 710)

1 MI S OF DECATUR, Macon, IL

Built 1959 ADT: 9,300

IC RR

Over: US 51(FAP 710)

IN DECATUR, Macon, IL

Built 1965 ADT: 8,700

US 51(FAP 710 ALT)

Over: NS RR & CERRO GORDO ST.

IN DECATUR, Macon, IL

Built 1966 ADT: 850

US 36(FAP 320)

Over: LAKE SHORE DR(U 7390

IN DECATUR, Macon, IL

Built 1954 ADT: 200

IT RR

Over: IL 121(FAP 320)

N OF GARFIELD-DECATR, Macon, IL

Built 1943 ADT: 15,100

CN RR

Over: FAP 714 (IL 105)

SWCL OF DECATUR, Macon, IL

Built 1962 ADT: 9,800

IC RR

Over: PERSHING(FAP 320)

IN DECATUR, Macon, IL

Built 1959 ADT: 18,100

IC RR

Over: OAKLAND(FAU 7429)

IN DECATUR, Macon, IL

Built 1934 ADT: 14,800

N&S RR

Over: FAIRVIEW(FAU 7429)

IN DECATUR, Macon, IL

Built 1900 ADT: 9,500

TR 150(GREENSWITCH

Over: I-72

1.83 MI S FAS 549, Macon, IL

Built 1972 ADT: 12,300

TR 4(ACOM RD)

Over: I-72

1.5 MI SW NIANTIC, Macon, IL

Built 1976 ADT: 14,500

CH 55(FAS 644)

Over: I-72

1 MI S OF NIANTIC, Macon, IL

Built 1976 ADT: 14,800

CH 27(FAS 551)

Over: I-72

1 MI SW HARRISTOWN, Macon, IL

Built 1976 ADT: 14,800

FAU 7351

Over: I-72

1 MI S HARRISTOWN, Macon, IL

Built 1976 ADT: 14,800

I-72 (EB)

Over: FAP 323 WB(US 36)

IN HARRISTOWN, Macon, IL

Built 1976 ADT: 4,350

I-72 (EB)

Over: FAP 322A(US 51 SB)

IN HARRISTOWN, Macon, IL

Built 1976 ADT: 4,500

I-72(WB) & US 51(S

Over: FAU 7381

N EDGE HARRISTOWN, Macon, IL

Built 1976 ADT: 2,750

I-72(EB) & US 51(N

Over: FAU 7381(HARSTWN BLV

N EDGE HARRISTOWN, Macon, IL

Built 1976 ADT: 2,750

I-72 (WB)

Over: TR 117 NS RR

1 MI N HARRISTOWN, Macon, IL

Built 1976 ADT: 50

I-72 (EB)

Over: TR 117 NS RR

1 MI N HARRISTOWN, Macon, IL

Built 1976 ADT: 50

CH 41(FAS 1538)

Over: I-72

2 MI N HARRISTOWN, Macon, IL

Built 1976 ADT: 14,000

FAU 7354 S.ELIZABE

Over: I-72

.5 MI S ILL-121 INT, Macon, IL

Built 1976 ADT: 14,000

I-72 (EB)

Over: FA320 (IL-121) & CN RR

1.5 MI NW DECATUR, Macon, IL

Built 1976 ADT: 7,600

I-72 (WB)

Over: FA320 (IL-121) & CN RR

1.5 MI NW DECATUR, Macon, IL

Built 1976 ADT: 7,600

FAU 7431(OAKLAND A

Over: I-72

N EDGE OF DECATUR, Macon, IL

Built 1976 ADT: 12,800

I-72 (EB)

Over: IL-48 & DECATUR CENTRALR

2.5 MI E FORSYTH, Macon, IL

Built 1974 ADT: 7,600

I-72 (WB)

Over: IL-48 & DECATUR CENTRALR

2.5 MI E FORSYTH, Macon, IL

Built 1974 ADT: 7,600

TR 45(KIRBY RD)

Over: I-72

NE OF DECATUR, Macon, IL

Built 1975 ADT: 11,500

CH 20(FAS 549B)

Over: I-72

1 MI E OF OREANA, Macon, IL

Built 1975 ADT: 11,500

FAS 544(CH 25)

Over: I-72

ARGENTA INTERCHANGE, Macon, IL

Built 1975 ADT: 11,900

TR 270(CEMETERY RD

Over: I-72

.5 MI SE ARGENTA, Macon, IL

Built 1975 ADT: 11,900

I-72 (EB)

Over: FAS1536 DECATUR CENTRALR

1.5 MI NE ARGENTA, Macon, IL

Built 1975 ADT: 750

I-72 (WB)

Over: FAS1536 DECATUR CENTRALR

1.5 MI NE ARGENTA, Macon, IL

Built 1975 ADT: 750

CH 18(SCHOOL RD)

Over: I-72

1.5 MI W OF CO LINE, Macon, IL

Built 1975 ADT: 11,900

FAP 322(NB) (US 5

Over: BS-51 & DECATUR CENTRALR

1 MI S OF DECATUR, Macon, IL

Built 1976 ADT: 6,350

FAP 322(SB) (US 51

Over: BS-51 & DECATUR CENTRALR

1 MI S OF DECATUR, Macon, IL

Built 1976 ADT: 6,350

FAU 7421

Over: FAP 322A(US 51)

1 MI SW OF DECATUR, Macon, IL

Built 1976 ADT: 5,900

FAP 322(NB) (US 5

Over: FAU 7426(TAYLOR RD)

1 MI S OF DECATUR, Macon, IL

Built 1976 ADT: 275

FAP 322(SB) (US 5

Over: FAU 7426(TAYLOR RD)

1 MI S OF DECATUR, Macon, IL

Built 1976 ADT: 275

FAP 323(WB)(US 36)

Over: FAP 322 (US 51)

IN HARRISTOWN, Macon, IL

Built 1976 ADT: 4,500

FAP 323(EB)(US 36)

Over: FAP 322(US 51)

IN HARRISTOWN, Macon, IL

Built 1976 ADT: 5,900

FAP 322(SB)(US 51)

Over: IL-48 & NS RR

.5 MI SW OF DECATUR, Macon, IL

Built 1978 ADT: 4,550

FAP 322(NB)(US 51)

Over: IL-48 & NS RR

.5 MI SW OF DECATUR, Macon, IL

Built 1978 ADT: 4,550

NS RR

Over: FAU 7429(IL 48)

FAIRVIEW(DECATUR), Macon, IL

Built 1992 ADT: 13,500

FAP 710(NB BS RT 5

Over: FAP 322(US 51)

2 MI S OF ELWIN, Macon, IL

Built 1994 ADT: 2,700

TR 114B(RILEY RD)

Over: FAP 322(US 51)

2 MI S OF ELWIN, Macon, IL

Built 1994 ADT: 2,700

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