County profile · official public datasets

Clinton County, IL

190 public highway bridges tracked in the FHWA National Bridge Inventory: 56.3% rated Good, 36.3% Fair, 7.4% Poor.

190
Public bridges
56.3%
Good condition
7.4%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Clinton County posts a better-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

Top 48%
lowest Poor share in state
7.4%
Poor-condition share
190
public highway bridges
1976
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Clinton County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Clinton County ranks #49 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 7.4%). Clinton County, Illinois contains 190 public highway bridges. Roughly 56.3% are rated “Good,” 36.3% “Fair,” and 7.4% “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.

Total bridges

190

Public highway bridges in Clinton County

Good condition

56.3%

107 of 190 rated 7-9

Fair condition

36.3%

69 of 190 rated 5-6

Poor condition

7.4%

14 of 190 rated 4 or below

In-state Poor-share rank

#49 of 102

Among Illinois counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 190 NBI-tracked bridges by lowest applicable component rating.

Good
56.3% (107)
Fair
36.3% (69)
Poor
7.4% (14)

Clinton County's Poor-condition bridges carry 7,900 vehicle crossings a day

That is 1.9% of the county's reported daily bridge traffic on 7.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 564 crossings a day against 2,478 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 190 of 190 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

44.2% of Clinton County's bridges have passed the 50-year mark

84 of the 190 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 56.3% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

One structure carries 34.2% of the county's Poor-condition bridge traffic

ALBERS RD/FAS 785 over GRASSY BRANCH, built 1973, carries 2,700 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 14-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 7,900 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Clinton County's bridges were built

190 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1970s, when 39 of the county's bridges still in the inventory were built, which is 20.5% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1976) matches the Illinois average (1979).

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Clinton County compares with Illinois's closest counties by inventory size

The 5 Illinois counties nearest Clinton County in number of bridges, with their condition splits. Its 7.4% Poor share is the 4th-lowest of these 6. Its average build year of 1976 against a peer-group mean of 1979 is in line with the group.

Showing the 5 closest of 101 Illinois counties eligible for comparison.

Bridge inventory size and condition shares for Clinton County and the 5 Illinois counties closest to it in inventory size
County Bridges Poor
Jo Daviess County 193 9.8%
De Witt County 192 5.7%
Union County 192 3.6%
Clinton County (this page) 190 7.4%
Lawrence County 185 22.7%
Saline County 185 4.9%

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Clinton County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Clinton County, both outside Illinois so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside IL (190 bridges here).

Similar average build year

Nearest mean year-built outside IL (1976 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 190 Good 107 Fair 69 Poor 14

Good-condition bridges (107)

TR 165 Felton Road

Good

Over: Prairie Creek

3 Mi. S. of US 50, Clinton, IL

Built 2015 Load: 32.4 t ADT: 150

TR 109 Old State R

Good

Over: Shoal Creek

2 Mi N of Breese, Clinton, IL

Built 2018 Load: 32.4 t ADT: 750

BROOKSIDE AV/FAU86

Good

Over: SEWER CREEK

BROOKSIDE AVE, Clinton, IL

Built 1977 Load: 32.4 t ADT: 2,400

TR 126/FLAT BRANCH

Good

Over: FLAT BRANCH CREEK

2 MI SW MARYDALE, Clinton, IL

Built 1978 Load: 32.4 t ADT: 200

TR 175/CRILEY ROAD

Good

Over: CRILEY BRANCH

1.8 MI. N. CENTRALIA, Clinton, IL

Built 1982 Load: 32.4 t ADT: 200

TR 6/SAND HILL RD

Good

Over: QUEENS LAKE BRANCH

0.5 SO. RT160 RT 177, Clinton, IL

Built 1984 Load: 32.4 t ADT: 50

PIONEER ROAD

Good

Over: TRIB. SANTA FE DITCH

1300E PIONEER RD, Clinton, IL

Built 1997 Load: 32.4 t ADT: 350

BECKEMEYER FAS 178

Good

Over: TRIB TO BEAVER CR.

.75 N OF BECKEMEYER, Clinton, IL

Built 2002 Load: 32.4 t ADT: 450

WIEDLE RD/TR 81

Good

Over: BR. OF CARLYLE LK

4MI SW OF BOULDER, Clinton, IL

Built 2005 Load: 32.4 t ADT: 100

DRIVE IN RD/TR 70

Good

Over: GRASSY BRANCH

2MI S OF BREESE, Clinton, IL

Built 2005 Load: 32.4 t ADT: 850

TR 37/SPRING RD

Good

Over: DRAINAGE DITCH

1 MI E STOLLETOWN, Clinton, IL

Built 2008 Load: 32.4 t ADT: 275

EMERALD RD/CH 17

Good

Over: BEAVER CK OVERFLOW

1590E EMERALD RD, Clinton, IL

Built 1996 Load: 32.4 t ADT: 350

EMERALD RD

Good

Over: BEAVER CREEK OVERFLO

1575E EMERALD RD, Clinton, IL

Built 1996 Load: 32.4 t ADT: 350

CH 19/DIAMOND SPRI

Good

Over: COLES CREEK

1580N DIAMOND SPRING, Clinton, IL

Built 1997 Load: 32.4 t ADT: 325

EMERALD RD CH 17

Good

Over: FLAT BRANCH

0.7 MILES W. ILL127, Clinton, IL

Built 1999 Load: 32.4 t ADT: 350

WRINGE RD. CH 9

Good

Over: BEAVER CREEK

3.5 MI W OF ILL 127, Clinton, IL

Built 2000 Load: 32.4 t ADT: 225

Wringe Rd

Good

Over: Trib. to Beaver Cr

2 Mi NW of Carlyle, Clinton, IL

Built 2014 Load: 32.4 t ADT: 225

CH9 WRINGE RD

Good

Over: TRIB TO BEAVER CREEK

2M WEST OF CARLYLE, Clinton, IL

Built 2008 Load: 32.4 t ADT: 225

Emerald Road CH 1

Good

Over: Beaver Creek

4 Mi NW of Carlyle, Clinton, IL

Built 2016 Load: 32.4 t ADT: 350

SO 4TH ST

Good

Over: DRAINAGE DITCH

SO 4TH ST, Clinton, IL

Built 1991 Load: 32.4 t ADT: 850

OLD CARLYLE RD

Good

Over: TRIB TO SHOAL CREEK

BREESE, Clinton, IL

Built 1994 Load: 32.4 t ADT: 350

MSS6100

Good

Over: TRIB TO SUGAR CK

1MI N OF AVISTION, Clinton, IL

Built 2003 Load: 32.4 t ADT: 1,000

FAS 783

Good

Over: CREEK

2.3M W DAMIANSVILLE, Clinton, IL

Built 1965 Load: 33.0 t ADT: 200

ILL 177

Good

Over: QUEENS LAKE BRANCH

1/2MI W NEW MEMPHIS, Clinton, IL

Built 1997 Load: 33.4 t ADT: 2,100

TR 215E CENTER ST

Good

Over: QUEENS LAKE BRANCH

NEW MEMPHIS, Clinton, IL

Built 1995 Load: 33.4 t ADT: 450

ILL 160

Good

Over: FAI 64

3 MI W DAMIANSVILLE, Clinton, IL

Built 1970 Load: 33.7 t ADT: 2,450

FAI 64 WB

Good

Over: KASKASKIA OVERFLOW

1/4 mi W County Line, Clinton, IL

Built 1970 Load: 33.7 t ADT: 15,500

County Line Rd-CH

Good

Over: FAI 64

ST CLAIR CO LINE, Clinton, IL

Built 1972 Load: 34.0 t ADT: 625

OLD US 50

Good

Over: SUGAR CREEK BRANCH

2.7 W OF AVISTON, Clinton, IL

Built 1999 Load: 34.3 t ADT: 3,550

IL 161

Good

Over: KASKASKIA R OVERFLOW

2.6 M EAST BARTELSO, Clinton, IL

Built 1994 Load: 35.3 t ADT: 2,250

CAMP JOY RD/TR 134

Good

Over: STONE QUARRY CREEK

.75 MW OF FAP 117, Clinton, IL

Built 1960 Load: 35.6 t ADT: 200

IL 161

Good

Over: KASKASKIA R OVERFLOW

3.6 M EAST BARTELSO, Clinton, IL

Built 1994 Load: 36.0 t ADT: 2,250

ILL 160

Good

Over: US 50

N SIDE OF TRENTON, Clinton, IL

Built 1980 Load: 37.3 t ADT: 5,000

IL 177

Good

Over: QUEENS LAKE BRANCH

0.2M E NEW MEMPHIS, Clinton, IL

Built 1997 Load: 38.2 t ADT: 2,000

US 50 WB

Good

Over: CH 11-N WALNUT ST

AT BREESE, Clinton, IL

Built 1985 Load: 38.6 t ADT: 6,100

ILL 161

Good

Over: SUGAR CREEK BR

0.9 E ALBERS, Clinton, IL

Built 1934 Load: 38.9 t ADT: 4,800

US 50

Good

Over: LAKE BRANCH CREEK

5.5MI E OF TRENTON, Clinton, IL

Built 1973 Load: 39.2 t ADT: 6,850

FAI 64 WB

Good

Over: SUGAR CK OVERFLOW

1/2 mi W DAMIANSVLLE, Clinton, IL

Built 1971 Load: 40.5 t ADT: 15,500

IL 161

Good

Over: KASKASKIA RIVER OVFL

5.2M EAST BARTELSO, Clinton, IL

Built 1994 Load: 40.5 t ADT: 2,250

OLD US 50

Good

Over: EAST BREESE CREEK

.2MI E OF BREESE, Clinton, IL

Built 2004 Load: 42.1 t ADT: 6,000

ILL 161

Good

Over: CROOKED CREEK

8.6 M E IL 127, Clinton, IL

Built 2019 Load: 42.4 t ADT: 6,100

SCHUMACHER RD - TR

Good

Over: NEW US 50

5 MI E OF TRENTON, Clinton, IL

Built 1973 Load: 42.8 t ADT: 650

SHATTUC RD/FAS 178

Good

Over: PRAIRIE CREEK

1.5MI N IL 161, Clinton, IL

Built 1988 Load: 45.0 t ADT: 2,250

IL 127

Good

Over: KASKASKIA RIVER

2.5 M SE CARLYLE, Clinton, IL

Built 2015 Load: 45.4 t ADT: 3,550

IL 177/160

Good

Over: KASKASKIA OVERFLOW

1.2M E of NEW MEMPHI, Clinton, IL

Built 1997 Load: 45.4 t ADT: 1,750

US 50

Good

Over: E Trib Prairie Br

6.5 MI E OF CARLYLE, Clinton, IL

Built 2012 Load: 45.7 t ADT: 4,250

US 50

Good

Over: LOST CREEK

9.6 MI EA OF CARLYLE, Clinton, IL

Built 1997 Load: 46.0 t ADT: 3,900

FAI 64 EB

Good

Over: SYCAMORE DRAINAGE DT

.75 W COUNTY LINE, Clinton, IL

Built 1970 Load: 46.3 t ADT: 15,500

FAI 64 WB

Good

Over: SYCAMORE DRAIN DITCH

3/4 MI WEST OF CL, Clinton, IL

Built 1970 Load: 46.3 t ADT: 15,500

FAS 787 Boulder Rd

Good

Over: Gibbs Creek

1.5 Mi S of Boulder, Clinton, IL

Built 2021 Load: 47.0 t ADT: 400

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

Related

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

Every figure on PlainBridges 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. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.