County profile · official public datasets

Macoupin County, IL

242 public highway bridges tracked in the FHWA National Bridge Inventory: 36.4% rated Good, 45.9% Fair, 17.8% Poor.

242
Public bridges
36.4%
Good condition
17.8%
Poor condition

The verdict

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

Macoupin County pairs a higher-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.

95th
of 102 on Poor share
17.8%
Poor-condition share
242
public highway bridges
1965
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.

Macoupin County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Macoupin County ranks #95 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 17.8%). Macoupin County, Illinois contains 242 public highway bridges. Roughly 36.4% are rated “Good,” 45.9% “Fair,” and 17.8% “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

242

Public highway bridges in Macoupin County

Good condition

36.4%

88 of 242 rated 7-9

Fair condition

45.9%

111 of 242 rated 5-6

Poor condition

17.8%

43 of 242 rated 4 or below

In-state Poor-share rank

#95 of 102

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

Condition distribution

Share of 242 NBI-tracked bridges by lowest applicable component rating.

Good
36.4% (88)
Fair
45.9% (111)
Poor
17.8% (43)

Macoupin County's Poor-condition bridges carry 16,655 vehicle crossings a day

That is 8.9% of the county's reported daily bridge traffic on 17.8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 387 crossings a day against 497 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 242 of 242 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

48.8% of Macoupin County's bridges have passed the 50-year mark

118 of the 242 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 36.4% 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 25.2% of the county's Poor-condition bridge traffic

IL 111 over PIASA CREEK, built 1929, carries 4,200 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 43-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 16,655 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Macoupin County's bridges were built

242 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1980s, when 34 of the county's bridges still in the inventory were built, which is 14% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year is 1965, 14 years older than the Illinois average of 1979.

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

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

The 5 Illinois counties nearest Macoupin County in number of bridges, with their condition splits. Its 17.8% Poor share is the 6th-lowest of these 6. Its average build year of 1965 against a peer-group mean of 1979 is 14 years older.

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

Bridge inventory size and condition shares for Macoupin County and the 5 Illinois counties closest to it in inventory size
County Bridges Poor
Lake County 251 10%
Piatt County 246 6.1%
Macoupin County (this page) 242 17.8%
Morgan County 234 8.5%
Washington County 233 6%
Douglas County 232 1.3%

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 Macoupin 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 Macoupin County, both outside Illinois so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside IL (242 bridges here).

Similar average build year

Nearest mean year-built outside IL (1965 here).

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

All 242 Good 88 Fair 111 Poor 43

All bridges (242)

IL 4

Fair

Over: MACOUPIN CREEK

1.7M S IL 108, Macoupin, IL

Built 1960 Load: 55.7 t ADT: 4,450

FAI 55 NB

Fair

Over: TR 439

1.0MI S I-55/IL 138, Macoupin, IL

Built 1973 Load: 57.7 t ADT: 15,200

FAI 55 SB

Fair

Over: TR 439

1.0MI S I-55/IL 138, Macoupin, IL

Built 1973 Load: 58.0 t ADT: 15,200

ILL 138

Fair

Over: CAHOKIA CREEK

1.9MI W JCT FAI 55, Macoupin, IL

Built 1992 Load: 64.5 t ADT: 2,700

ILL 108

Fair

Over: DRAINAGE DITCH

0.1MI E IL 4, Macoupin, IL

Built 1933 Load: 89.1 t ADT: 6,950

ILL 108

Fair

Over: SUGAR CREEK

3.2MI E IL 4, Macoupin, IL

Built 1933 Load: 89.1 t ADT: 2,000

ILL 16

Fair

Over: COOP CR BRANCH

0.6MI W SHIPMAN, Macoupin, IL

Built 1932 Load: 89.1 t ADT: 2,200

ILL 16

Fair

Over: W FK COOP BRANCH

2.1MI W IL16/159 JCT, Macoupin, IL

Built 1932 Load: 89.1 t ADT: 1,800

TR 351

Fair

Over: CAHOKIA CR

4.5 NE EAGERVILLE, Macoupin, IL

Built 1920 Load: 89.1 t ADT: 175

FAS 736

Fair

Over: BRANCH OF SHERRY CR.

1.25MI.E.OF BUNKR HL, Macoupin, IL

Built 1980 Load: 89.1 t ADT: 1,200

IL 4

Fair

Over: MACOUPIN CR TRIB

.1M S IL 108, Macoupin, IL

Built 1960 Load: 92.0 t ADT: 4,450

FAS 732

Good

Over: MASSA CREEK

2MI E PALMYRA, Macoupin, IL

Built 1939 Load: 19.8 t ADT: 750

TR 422

Good

Over: RICHARDSON BRANCH

1 M SW STANDARD CTY, Macoupin, IL

Built 2009 Load: 23.3 t ADT: 35

9 MI. LANE

Good

Over: W. FK. OTTER CR.

5 MI. W. VIRDEN, Macoupin, IL

Built 1951 Load: 24.3 t ADT: 500

BRGHTON BNKR HIL R

Good

Over: HONEYCUT BRANCH

2.3 M E BRIGHTON, Macoupin, IL

Built 1953 Load: 24.3 t ADT: 1,450

CH 12 FAS 732

Good

Over: EAST FRK OTTER CR

.75 M W GIRARD, Macoupin, IL

Built 1938 Load: 24.3 t ADT: 1,850

TR 32

Good

Over: PIASA CR.

4.0 MI W SHIPMAN, Macoupin, IL

Built 1901 Load: 24.3 t ADT: 150

TR 473

Good

Over: SHERRY CRK.

5 MI W STAUTON, Macoupin, IL

Built 1900 Load: 24.6 t ADT: 175

TR 22

Good

Over: LICK CREEK

1M SO 1M W SCOTTVILL, Macoupin, IL

Built 1986 Load: 26.6 t ADT: 20

TR 369

Good

Over: CAHOKIA CR

2 MI E GILLESPIE, Macoupin, IL

Built 1978 Load: 29.5 t ADT: 150

TR 134

Good

Over: BEAR CR

2 MI NE CHESTERFIELD, Macoupin, IL

Built 1977 Load: 30.8 t ADT: 35

IL 4

Good

Over: SPANISH NEEDLE CR BR

3M N IL 16-GILLESPIE, Macoupin, IL

Built 1987 Load: 32.4 t ADT: 2,050

OLD IL 4

Good

Over: HURRICANE CREEK

3.3M N IL108-CARLNVL, Macoupin, IL

Built 2007 Load: 32.4 t ADT: 100

TR 329

Good

Over: SPANISH NEEDLE CR

3 M N GILLESPI, Macoupin, IL

Built 2006 Load: 32.4 t ADT: 175

TR 477

Good

Over: W FRK CAHOKIA CR

3 M S WILSONVILLE, Macoupin, IL

Built 2009 Load: 32.4 t ADT: 125

TR 177

Good

Over: Shearles Branch

0.28 mi E TR 478, Macoupin, IL

Built 2022 Load: 32.4 t ADT: 50

CH 18

Good

Over: OTTER CREEK

1 MI. E. HETTICK, Macoupin, IL

Built 1955 Load: 32.4 t ADT: 275

FAS 1737 / CH 9

Good

Over: SOLOMON CREEK

.5 MI. W. HETTICK, Macoupin, IL

Built 1964 Load: 32.4 t ADT: 300

TR 305

Good

Over: COOP BRANCH

3 M NE MEDORA, Macoupin, IL

Built 2010 Load: 32.4 t ADT: 20

TR473

Good

Over: CREEK

4.5 MI. W.STAUTON, Macoupin, IL

Built 1977 Load: 32.4 t ADT: 75

TR 47

Good

Over: CREEK

1.5 MI SW VIRDEN, Macoupin, IL

Built 1980 Load: 32.4 t ADT: 50

TR 201

Good

Over: LICK CR

3.0 MI SE HETTICK, Macoupin, IL

Built 1983 Load: 32.4 t ADT: 20

TR 181

Good

Over: SOLOMON CRK

2.5 MI SW HETTICK, Macoupin, IL

Built 1984 Load: 32.4 t ADT: 20

TR 173

Good

Over: STEER CRK

3.5 MI W HETTICK, Macoupin, IL

Built 1984 Load: 32.4 t ADT: 50

TR 234

Good

Over: MAY CR

3MI S MACOUPIN STA, Macoupin, IL

Built 1984 Load: 32.4 t ADT: 100

TR 465

Good

Over: HONEY CUT BRANCH

1.5 SO 2.5E BRIGHTON, Macoupin, IL

Built 1986 Load: 32.4 t ADT: 325

TR 353

Good

Over: MAY BRANCH

2.5 MI NO ROYAL LAKE, Macoupin, IL

Built 1986 Load: 32.4 t ADT: 35

TR 237

Good

Over: JOES CREEK

4.5 MI NW CHESTERFIE, Macoupin, IL

Built 1985 Load: 32.4 t ADT: 50

FAS 732

Good

Over: E FK OTTER CR

2 M W GIRARD, Macoupin, IL

Built 2003 Load: 32.4 t ADT: 1,700

FAS 1741

Good

Over: MACOUPIN CREEK

6 MI E NILWOOD, Macoupin, IL

Built 2008 Load: 32.4 t ADT: 225

CH 10

Good

Over: MAY BRANCH

2 M E PLAINVIEW, Macoupin, IL

Built 2013 Load: 32.4 t ADT: 125

CH 11

Good

Over: OTTER CREEK

5 M NE OF HETTICK, Macoupin, IL

Built 2008 Load: 32.4 t ADT: 150

CH 34

Good

Over: JOES CREEK

5.5MI SW HETTICK, Macoupin, IL

Built 1997 Load: 32.4 t ADT: 50

TR 4

Good

Over: APPLE CREEK

2 M NW SCOTTVILLE, Macoupin, IL

Built 2009 Load: 32.4 t ADT: 50

TR 39

Good

Over: CREEK

6.0 MI. W OF VIRDEN, Macoupin, IL

Built 1996 Load: 32.4 t ADT: 20

TR 90

Good

Over: MACOUPIN CREEK

4 MI S CHESTERFIELD, Macoupin, IL

Built 1993 Load: 32.4 t ADT: 100

TR 94

Good

Over: LICK CREEK

1.7MI N CHESTERFIELD, Macoupin, IL

Built 1999 Load: 32.4 t ADT: 35

TR 149

Good

Over: SHEARLESS CR

1 MI N STANDARD CITY, Macoupin, IL

Built 2005 Load: 32.4 t ADT: 35

TR 182

Good

Over: LICK CREEK

3.5 MI SE HETTICK, Macoupin, IL

Built 2002 Load: 32.4 t ADT: 20

TR-249 (Rinaker Rd

Good

Over: Hurricane Creek

0.80 W Shipman Blktp, Macoupin, IL

Built 2017 Load: 32.4 t ADT: 375

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.