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)

US 136

Fair

Over: RED OAK DITCH

3.5 MI W JCT 29&136, Mason, IL

Built 1962 Load: 40.2 t ADT: 1,150

IL 29

Fair

Over: SLEEPY HOLLOW DITCH

1.5M N MENARD COUNTY, Mason, IL

Built 1959 Load: 89.1 t ADT: 2,000

ILL 97

Good

Over: PECAN RUN CREEK

1.2MI SO KILBOURNE, Mason, IL

Built 1986 Load: 20.1 t ADT: 1,600

ILL 29

Good

Over: ALLENS GROVE DITCH

.5MI S JCT US136& 29, Mason, IL

Built 1959 Load: 23.2 t ADT: 2,450

TR 41

Good

Over: MASON-TAZEWELL DITCH

3 E OF TOPEKA, Mason, IL

Built 1965 Load: 30.8 t ADT: 50

FAS 568 CH3

Good

Over: QUIVER CREEK

.25 M S TOPEKA, Mason, IL

Built 2010 Load: 32.4 t ADT: 125

FAS 1585(CH 21)

Good

Over: Crane Creek

0.46 mi E TR 122, Mason, IL

Built 2015 Load: 32.4 t ADT: 450

FAS 572 CH 5

Good

Over: SAMUALS DITCH

.5 M W EASTON, Mason, IL

Built 2008 Load: 32.4 t ADT: 200

FAS 1595 (CH 19)

Good

Over: SLEEPY HALLOW DITCH

4 M SW MASON CITY, Mason, IL

Built 2012 Load: 32.4 t ADT: 275

FAS 1587 / CH 2

Good

Over: BRANCH OF JORDAN CRK

2.5MI W KILBOURNE, Mason, IL

Built 1995 Load: 32.4 t ADT: 125

FAS 1587 / CH 2

Good

Over: BRANCH OF JORDAN CRK

3.0 SW OF KILBOURNE, Mason, IL

Built 1995 Load: 32.4 t ADT: 125

FAS 1587

Good

Over: BRANCH OF JORDAN CRK

4MI SW OF KILBOURNE, Mason, IL

Built 1995 Load: 32.4 t ADT: 125

COUNTY HIGHWAY 4

Good

Over: HICKORY GROVE DITCH

1.5 MI E OF MANITO, Mason, IL

Built 1998 Load: 32.4 t ADT: 650

COUNTY HIGHWAY 4

Good

Over: MEEKER DITCH

2.5 MI E OF MANITO, Mason, IL

Built 1998 Load: 32.4 t ADT: 750

COUNTY HIGHWAY 4

Good

Over: BREED LOVE DITCH

3.5 MI E OF MANITO, Mason, IL

Built 1998 Load: 32.4 t ADT: 750

TR 39

Good

Over: MASON TAZEWELL DITCH

2 MI SW FOREST CITY, Mason, IL

Built 1987 Load: 32.4 t ADT: 100

TR 47

Good

Over: RED OAK DITCH

4 M SE FORREST CITY, Mason, IL

Built 2007 Load: 32.4 t ADT: 75

TR 59

Good

Over: ALLENS GROVE DITCH

5.5 M NW SAN JOSE, Mason, IL

Built 2007 Load: 32.4 t ADT: 50

TR 59

Good

Over: MAIN DITCH BRANCH

2.75MI NW SAN JOSE, Mason, IL

Built 1991 Load: 32.4 t ADT: 50

TR 266

Good

Over: ALLENS GROVE DITCH

2.5 M W SAN JOSE, Mason, IL

Built 2012 Load: 32.4 t ADT: 25

TR 75

Good

Over: Allens Grove Ditch

2.5 mi SW San Jose, Mason, IL

Built 2013 Load: 32.4 t ADT: 25

TR 10

Good

Over: FISH CREEK

2MI NW CHANDLERVILLE, Mason, IL

Built 1991 Load: 32.4 t ADT: 25

TR 129

Good

Over: CRANE CR

2.5 M SW EASTON, Mason, IL

Built 2008 Load: 32.4 t ADT: 25

TR 171

Good

Over: SLEEPY HOLLOW BRANCH

3.5MI SW MASON CITY, Mason, IL

Built 1989 Load: 32.4 t ADT: 50

TR 178

Good

Over: FURRER DITCH

2.5 MI NE EASTON, Mason, IL

Built 1970 Load: 32.4 t ADT: 75

FAS 1586

Good

Over: DRAINAGE DITCH

4 M NW KILBORNE, Mason, IL

Built 2004 Load: 32.4 t ADT: 225

TR 234

Good

Over: Main Ditch

0.30 mi N TR 47, Mason, IL

Built 2018 Load: 33.0 t ADT: 50

ILL 10

Good

Over: ROSS & TYRELL DITCH

.5 MI E EASTON, Mason, IL

Built 1988 Load: 36.9 t ADT: 1,200

ILL 10

Good

Over: DRAINAGE DITCH

W. EDGE OF TEHERAN, Mason, IL

Built 1988 Load: 36.9 t ADT: 1,200

TR 125

Good

Over: PRARIE CREEK BRANCH

3 MI NE MASON CITY, Mason, IL

Built 1983 Load: 38.2 t ADT: 50

FAS 567 (CH 20)

Good

Over: Quiver Creek

0.43 mi W FAS 571, Mason, IL

Built 2022 Load: 42.8 t ADT: 1,300

COUNTY HIGHWAY 11

Poor

Over: RED OAK DITCH

6 MI NE OF EASTON, Mason, IL

Built 1954 Load: 21.1 t ADT: 75

TR 153

Poor

Over: KILLION DITCH

0.25 mi W of FAS 572A, Mason, IL

Built 1972 Load: 23.3 t ADT: 25

TR 190

Poor

Over: MAIN DITCH

2 MI SE FOREST CITY, Mason, IL

Built 1972 Load: 26.6 t ADT: 75

TR 208

Structurally Deficient

Over: SLEEPY HOLLOW DITCH

4 SW OF MASON CITY, Mason, IL

Built 1986 ADT: 25

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