Mason County, IL

85 public highway bridges

Mason County Bridge Snapshot

Mason County, Illinois contains 85 public highway bridges in the FHWA National Bridge Inventory. Roughly 34.1% are rated “Good,” 58.8% “Fair,” 4.7% “Poor,” and 4.7% 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.

85

Total Bridges

34.1%

Good

4.7%

Poor

4.7%

Structurally Deficient

Condition Distribution

Good

34.1% (29)

Fair

58.8% (50)

Poor

4.7% (4)

SD

4.7% (4)

All Bridges (85)

Sort:

PEDESTRIAN WALKWAY

Over: MAIN STREET

HAVANA, Mason, IL

Built 1996 ADT: 25

C&NW RR

Over: TR 125

2 M NE MASON CITY, Mason, IL

Built 1931 ADT: 25

TR 105

Over: WHITE OAK CREEK

3.5 MI S HAVANA, Mason, IL

Built 1959 Load: 17.5 t ADT: 50

TR 268

Over: ROGERS DITCH

3 MI SE MASON CITY, Mason, IL

Built 1900 Load: 21.1 t ADT: 50

TR 83

Over: HARDIN DITCH

3 MI NNW EASTON, Mason, IL

Built 1976 Load: 22.4 t ADT: 50

FAS 567

Over: C & IM RR CO

N CITY LIMITS HAVANA, Mason, IL

Built 1949 Load: 22.7 t ADT: 2,150

TR 150

Over: MASON TAZEWELL DITCH

0.5 MI SW FOREST CTY, Mason, IL

Built 1910 Load: 23.3 t ADT: 50

TR 194

Over: SLEEPY HOLLOW DITCH

4.5 MI SW MASON CITY, Mason, IL

Built 1972 Load: 23.3 t ADT: 25

TR 95

Over: HARDIN DITCH

2 MI N OF EASTON, Mason, IL

Built 1976 Load: 24.3 t ADT: 50

TR 254

Over: ASH GROVE DITCH

3.5 MI NW SAN JOSE, Mason, IL

Built 1976 Load: 24.3 t ADT: 25

TR 276

Over: ROGERS DITCH

3.5 MI SE MASON CITY, Mason, IL

Built 1970 Load: 24.3 t ADT: 75

FAS 461 CO HWY 4

Over: QUIVER DITCH

FOREST CITY CL, Mason, IL

Built 1948 Load: 26.2 t ADT: 500

TR 156

Over: FURRER DITCH

1.5 MI NE EASTON, Mason, IL

Built 1972 Load: 26.2 t ADT: 75

CH 10

Over: ASH GROVE DITCH

4.5 MI NW OF SAN JOS, Mason, IL

Built 1976 Load: 27.2 t ADT: 1,650

TR 82

Over: MASON-TAZEWELL DITCH

1 MI W TOPEKA, Mason, IL

Built 1970 Load: 27.2 t ADT: 75

TR 242

Over: ALLENS GROVE DITCH

0.48 mi S US 136, Mason, IL

Built 1972 Load: 27.2 t ADT: 50

FAS 572 CO HWY 5

Over: CRANE CREEK

3 MI E OF KILBOURNE, Mason, IL

Built 1956 Load: 27.5 t ADT: 250

TR 171

Over: SW MASON CITY DITCH

1.5M SW MASON CITY, Mason, IL

Built 1983 Load: 27.9 t ADT: 175

TR 109

Over: CRANE CREEK

1 MI NW EASTON, Mason, IL

Built 1950 Load: 31.8 t ADT: 125

FAS 572 (CH 5)

Over: DUFF ARMSTRONG DITCH

1.5 M SW EASTON, Mason, IL

Built 2012 Load: 32.4 t ADT: 200

TR 43

Over: QUIVER CR

2.5 MI W TOPEKA, Mason, IL

Built 1984 Load: 32.4 t ADT: 25

TR43

Over: QUIVER CREEK

2.5MI W TOPEKA, Mason, IL

Built 1985 Load: 32.4 t ADT: 25

TR 112

Over: MASON TAZEWELL DITCH

1.0 MI E OF TOPEKA, Mason, IL

Built 1987 Load: 32.4 t ADT: 25

TR 27

Over: MAIN DITCH

1 MI SE FOREST CITY, Mason, IL

Built 1983 Load: 32.4 t ADT: 50

TR 206A

Over: MAIN DITCH

3 MI SE FOREST CITY, Mason, IL

Built 1956 Load: 32.4 t ADT: 225

TR 234

Over: ALLENS GROVE DITCH

7 MI WEST SAN JOSE, Mason, IL

Built 1983 Load: 32.4 t ADT: 50

TR 158

Over: FURRER DITCH

2 MI NE EASTON, Mason, IL

Built 1983 Load: 32.4 t ADT: 25

TR 165

Over: JORDAN CREEK

3MI NW KILBOURNE, Mason, IL

Built 1988 Load: 32.4 t ADT: 50

TR 129

Over: DUFF ARMSTRONG DITCH

2.5 MI. SW EASTON, Mason, IL

Built 1988 Load: 32.4 t ADT: 25

TR 129

Over: DUFF ARMSTRONG DITCH

2 MI SSW EASTON, Mason, IL

Built 1988 Load: 32.4 t ADT: 75

TR 165

Over: CRANE CR

3.5 MI NE KILBORNE, Mason, IL

Built 1976 Load: 32.4 t ADT: 50

TR 100 (2400E)

Over: Crane Creek

0.60 mi S TR 129, Mason, IL

Built 2015 Load: 32.4 t ADT: 25

TR 153

Over: LOCAL DITCH

3M S EASTON, Mason, IL

Built 1996 Load: 32.4 t ADT: 25

TR 125

Over: BECKER DITCH

3 MI ENE MASON CITY, Mason, IL

Built 1982 Load: 32.4 t ADT: 25

TR 171

Over: PRAIRIE CK

4.5 MI ESEMASON CTY, Mason, IL

Built 1978 Load: 32.4 t ADT: 175

TR 276

Over: SUGAR CREEK

5 MI SE OFMASON CITY, Mason, IL

Built 1980 Load: 32.4 t ADT: 50

TR 189

Over: CENW RR

3.5 MI ESE MASON CIT, Mason, IL

Built 1984 Load: 32.4 t ADT: 50

TR 193A

Over: SALT CREEK TRIBUTARY

5 MI SW MASON CITY, Mason, IL

Built 2010 Load: 32.4 t ADT: 75

FAP 614 (IL 78)

Over: DITCH

1.50 M S US 136, Mason, IL

Built 1978 Load: 32.4 t ADT: 2,250

IL 10

Over: DITCH

1.50M S US 136, Mason, IL

Built 1970 Load: 32.4 t ADT: 550

IL 10

Over: DITCH

.50M S US 136, Mason, IL

Built 1970 Load: 32.4 t ADT: 550

US 136

Over: DITCH

1.08 E IL 10, Mason, IL

Built 1966 Load: 32.7 t ADT: 1,700

IL 10

Over: CRANE CREEK

1.5 MI N EASTON, Mason, IL

Built 1925 Load: 33.4 t ADT: 550

ILL 10

Over: DITCH

1.0 MI W JCT I29/10, Mason, IL

Built 1927 Load: 34.3 t ADT: 1,200

IL 29

Over: SALT CREEK

MASON MENARD CO LINE, Mason, IL

Built 2002 Load: 34.7 t ADT: 2,000

US 136

Over: ALLENS GROVE DITCH

2 MI W JCT ILL 29, Mason, IL

Built 1962 Load: 35.0 t ADT: 1,150

ILL 78

Over: WHITE OAK CREEK

2.8MI S JCT 78/136, Mason, IL

Built 1931 Load: 36.6 t ADT: 1,750

TR 131 A

Over: PRAIRIE CK

4.5 MI E MASON CTY, Mason, IL

Built 1979 Load: 36.6 t ADT: 50

OLD US 136

Over: COUNTY DITCH

S US136, 1.2M E IL10, Mason, IL

Built 1928 Load: 37.6 t ADT: 25

TR 218

Over: MAIN DITCH

4.5 MI SE FOREST CTY, Mason, IL

Built 1980 Load: 39.2 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 5, 2026