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)

CH 11

Poor

Over: MASSA CRK.

.5 E 2.5 S PALMYRA, Macoupin, IL

Built 1940 Load: 0.0 t ADT: 150

TR 13

Poor

Over: SUGAR CREEK

5 MI W VIRDEN, Macoupin, IL

Built 1900 Load: 0.0 t ADT: 20

TR-55

Poor

Over: Solomon Creek

NW Edge Palmyra, Macoupin, IL

Built 1962 Load: 0.0 t ADT: 20

TR 205

Poor

Over: CREEK

1 N 3E CARLINVILLE, Macoupin, IL

Built 1965 Load: 0.0 t ADT: 150

TR 285

Poor

Over: HONEY CRK.

3E 4S CARLINVILLE, Macoupin, IL

Built 1900 Load: 0.0 t ADT: 35

TR 510/BIERMAN ROA

Poor

Over: SHAW PT BR

7 E. 1.S. CARLINVILL, Macoupin, IL

Built 1900 Load: 0.0 t ADT: 20

TR 98

Poor

Over: SOLOMON CR

1 MI N HETTICK, Macoupin, IL

Built 1977 Load: 0.0 t ADT: 100

TR 33

Poor

Over: BRUSH CRK.

1.2 M E OF VIRDEN, Macoupin, IL

Built 1954 Load: 4.5 t ADT: 100

TR 170

Poor

Over: MACOUPIN CRK

BEAVER DAM ST. PARK, Macoupin, IL

Built 1900 Load: 4.5 t ADT: 50

TR 488

Poor

Over: BRUSH CRK

1 MI NE VIRDEN, Macoupin, IL

Built 1955 Load: 5.2 t ADT: 200

FAS 1728

Poor

Over: LAKE

SW OF EAGERVILLE, Macoupin, IL

Built 2000 Load: 5.5 t ADT: 350

TR 166

Poor

Over: COOP BR

2 MI N .5 MI E SHIPM, Macoupin, IL

Built 1917 Load: 5.8 t ADT: 100

CH 34

Poor

Over: SOLOMON CRK.

3 SW OF HETTICK, Macoupin, IL

Built 1900 Load: 9.1 t ADT: 50

FAS 732

Poor

Over: OTTER LAKE

6 MI. W. GIRARD, Macoupin, IL

Built 1968 Load: 13.9 t ADT: 950

TR 496

Poor

Over: HORSE CRK.

4.5 E NILWOOD, Macoupin, IL

Built 1916 Load: 17.2 t ADT: 20

TR 352

Poor

Over: CREEK

5.0 MI W VIRDEN, Macoupin, IL

Built 1991 Load: 18.8 t ADT: 50

OLD IL 4

Poor

Over: HURRICANE CREEK

3M N IL108-CARLINVLE, Macoupin, IL

Built 1921 Load: 19.4 t ADT: 100

TR 173

Poor

Over: JOE CREEK

3 MI. W. HETTICK, Macoupin, IL

Built 1916 Load: 19.4 t ADT: 50

TR 253/CROSSCREEK

Poor

Over: SHAW PT BR

7 MI E 1 MI S CARLIN, Macoupin, IL

Built 1900 Load: 19.4 t ADT: 20

TR 359

Poor

Over: CAHOKIA CREEK

2 MI S HORNSBY, Macoupin, IL

Built 1900 Load: 19.4 t ADT: 50

TR 359

Poor

Over: CAHOKIA CREEK

2 MI S HORNSBY, Macoupin, IL

Built 1900 Load: 19.4 t ADT: 50

TR 498

Poor

Over: CREEK

4.5 NE STANDARD CY, Macoupin, IL

Built 1900 Load: 19.4 t ADT: 35

TR 189

Poor

Over: ANDERSON BRANCH

3 W 1 S STAND. CITY, Macoupin, IL

Built 1900 Load: 19.4 t ADT: 100

FAS 736

Poor

Over: GIRDER BR

5 MI. E. BRIGHTON, Macoupin, IL

Built 1919 Load: 19.8 t ADT: 2,650

TR 464

Poor

Over: CAHOKIA CR

1 M NE EAGERVILLE, Macoupin, IL

Built 2002 Load: 19.8 t ADT: 20

IL 111

Poor

Over: PIASA CREEK

0.2 M S JCT IL 16, Macoupin, IL

Built 1929 Load: 20.1 t ADT: 4,200

9 MI. LANE

Poor

Over: SUGAR CREEK

4 MI. W. VIRDEN, Macoupin, IL

Built 1932 Load: 23.3 t ADT: 650

OLD IL 4

Poor

Over: HONEY CREEK

6M S IL108-CARLINVIL, Macoupin, IL

Built 1920 Load: 24.3 t ADT: 20

TR 429

Poor

Over: E FK WOOD R

2 W 2N BUNKER, Macoupin, IL

Built 1969 Load: 25.9 t ADT: 125

TR 307

Poor

Over: COOP BRANCH

3.0 MI E MEDORA, Macoupin, IL

Built 1968 Load: 26.6 t ADT: 50

TR 130

Poor

Over: LICK CRK

3.5 MI SE HETTICK, Macoupin, IL

Built 1960 Load: 29.2 t ADT: 50

TR 402

Poor

Over: SUGAR CR

.5 S. 3.5 W. VIRDEN, Macoupin, IL

Built 1900 Load: 29.5 t ADT: 100

TOWNSHIP ROAD 451

Poor

Over: GIRDER CR

4.1 M E BRIGHTON, Macoupin, IL

Built 1900 Load: 30.5 t ADT: 200

FAS 1737

Poor

Over: JOES CRK

2.5 NW HETTICK, Macoupin, IL

Built 1967 Load: 31.1 t ADT: 200

FAS 0736

Poor

Over: WOOD RIVER

1.5 MI. W.BUNKERHILL, Macoupin, IL

Built 1932 Load: 32.4 t ADT: 1,900

TOWNSHIP ROAD 151

Poor

Over: CREEK

2.4 M ENE STD CITY, Macoupin, IL

Built 1981 Load: 32.7 t ADT: 50

TR 395

Poor

Over: FAI 55

1.8MI N I-55/IL 138, Macoupin, IL

Built 1973 Load: 38.9 t ADT: 650

TR 187

Poor

Over: LICK CR

3.0 MI SE HETTICK, Macoupin, IL

Built 1974 Load: 44.7 t ADT: 50

TR 424

Poor

Over: HONEY CREEK

6 MI N EAGARVILLE, Macoupin, IL

Built 1994 Load: 53.5 t ADT: 20

CH 29

Poor

Over: CAHAOKA CREEK

6.5 N MT OLIVE, Macoupin, IL

Built 1975 Load: 88.8 t ADT: 350

STAUNTON BUNKR HIL

Poor

Over: BR. SHERRYCREEK

2.5 MI E. BUNKERHILL, Macoupin, IL

Built 1970 Load: 89.1 t ADT: 900

BUNKR HIL STUNTN R

Poor

Over: PADDOCK CREEK

E. EDGE BUNKER HILL, Macoupin, IL

Built 1980 Load: 89.1 t ADT: 1,250

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.