Mason County, IL

85 public highway bridges

Mason County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Mason County, Illinois contains 85 public highway bridges. Roughly 34.1% are rated “Good,” 58.8% “Fair,” and 4.7% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

85
Total Bridges
34.1%
Good
58.8%
Fair
4.7%
Poor Condition

Condition Distribution

Good
34.1% (29)
Fair
58.8% (50)
Poor
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

TR 208

Poor

Over: SLEEPY HOLLOW DITCH

4 SW OF MASON CITY, Mason, IL

Built 1986 ADT: 25

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

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.