County profile · official public datasets

Madison County, IL

523 public highway bridges tracked in the FHWA National Bridge Inventory: 49.3% rated Good, 42.3% Fair, 8.4% Poor.

523
Public bridges
49.3%
Good condition
8.4%
Poor condition

The verdict

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

Madison County posts a higher-than-median Poor-condition share among rated counties in the state across large county bridge inventory.

60th
of 102 on Poor share
8.4%
Poor-condition share
523
public highway bridges
1979
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.

Madison County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Madison County ranks #60 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 8.4%). Madison County, Illinois contains 523 public highway bridges. Roughly 49.3% are rated “Good,” 42.3% “Fair,” and 8.4% “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

523

Public highway bridges in Madison County

Good condition

49.3%

258 of 523 rated 7-9

Fair condition

42.3%

221 of 523 rated 5-6

Poor condition

8.4%

44 of 523 rated 4 or below

In-state Poor-share rank

#60 of 102

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

Condition distribution

Share of 523 NBI-tracked bridges by lowest applicable component rating.

Good
49.3% (258)
Fair
42.3% (221)
Poor
8.4% (44)

Madison County's Poor-condition bridges carry 199,650 vehicle crossings a day

That is 4.8% of the county's reported daily bridge traffic on 8.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 4,538 crossings a day against 7,599 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 522 of 523 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

39.8% of Madison County's bridges have passed the 50-year mark

208 of the 523 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 49.3% 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 12.5% of the county's Poor-condition bridge traffic

FAI 270 EB over COUNTY DITCH, built 1963, carries 24,900 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 44-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 199,650 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Madison County's bridges were built

523 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1960s, when 101 of the county's bridges still in the inventory were built, which is 19.3% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1979) matches the Illinois average (1979).

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

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

The 5 Illinois counties nearest Madison County in number of bridges, with their condition splits. Its 8.4% Poor share is the 3rd-lowest of these 6. Its average build year of 1979 against a peer-group mean of 1978 is in line with the group.

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

Bridge inventory size and condition shares for Madison County and the 5 Illinois counties closest to it in inventory size
County Bridges Poor
Livingston County 579 8.3%
Iroquois County 570 14.4%
LaSalle County 528 12.3%
Madison County (this page) 523 8.4%
Vermilion County 494 7.3%
St. Clair County 486 9.1%

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

Similar inventory size

Nearest county inventories outside IL (523 bridges here).

Similar average build year

Nearest mean year-built outside IL (1979 here).

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

All 523 Good 258 Fair 221 Poor 44

All bridges (523)

DAVIS LN/ MSS 6160

Good

Over: S BR LITTLE PIASA

2.8 MI NW GODFREY, Madison, IL

Built 1978 Load: 32.4 t ADT: 400

SPRTSMNS LK RD/TR2

Good

Over: SUGAR FORK CREEK

1.5 MI SE MARINE, Madison, IL

Built 1985 Load: 32.4 t ADT: 100

TR 179/NIGGLI ROAD

Good

Over: LITTLE SILVER CREEK

4.0 MI NE GRANTFORK, Madison, IL

Built 1984 Load: 32.4 t ADT: 100

TR157

Good

Over: TRIB. TO SILVER CRK.

1 MILE SE OF HAMEL, Madison, IL

Built 1987 Load: 32.4 t ADT: 125

TR 165 MEFFERT RD

Good

Over: LITTLE SILVER CREEK

6.5 MI NORTH PIERRON, Madison, IL

Built 1986 Load: 32.4 t ADT: 150

BOND COUNTY TR 6

Good

Over: TRIBUTARY

3 MI SE NEW DOUGLAS, Madison, IL

Built 1986 Load: 32.4 t ADT: 25

TR 145

Good

Over: LITTLE SILVER CREEK

4.5 MI NE ALHAMBRA, Madison, IL

Built 1988 Load: 32.4 t ADT: 50

ALHAMBRA RD/ TR 29

Good

Over: TRIB. TO LITTLE SILV

.2 MI. S. ALHAMBRA, Madison, IL

Built 1986 Load: 32.4 t ADT: 50

RINDERER RD/ TR 36

Good

Over: SUGAR CREEK

4.5MI SE OF HIGHLAND, Madison, IL

Built 1990 Load: 32.4 t ADT: 325

NIGGLI RD/ TR 179

Good

Over: E. FORK SILVER CK

2.5 MI N GRANTFORK, Madison, IL

Built 1991 Load: 32.4 t ADT: 100

KEEBLER RD

Good

Over: BURDICK BR

.17MI S OF IL RT 162, Madison, IL

Built 1999 Load: 32.4 t ADT: 4,550

TR 372 LUDWIG RD

Good

Over: E. FORK OF SILVER CR

2.5 MI NE GRANTFORK, Madison, IL

Built 1993 Load: 32.4 t ADT: 50

TR 328 GEIGER RD

Good

Over: SAND CREEK

3 MI SE. ALHAMBRA, Madison, IL

Built 1996 Load: 32.4 t ADT: 75

TR 9

Good

Over: TRIB TO DRY FORK CK

1.5 MI N NEW DOUGLAS, Madison, IL

Built 1994 Load: 32.4 t ADT: 50

S MORELAND RD CH 1

Good

Over: TRIB INDIAN CREEK

2.0 MI S BETHALTO, Madison, IL

Built 2004 Load: 32.4 t ADT: 4,850

POAG RD. CH69

Good

Over: DELLAPLAIN BR.

1.1 MI. W. 157, Madison, IL

Built 1966 Load: 32.4 t ADT: 4,100

E MICK RD/TR 261A

Good

Over: WENDALL BRANCH

2.0 MI N OF TROY, Madison, IL

Built 1996 Load: 32.4 t ADT: 200

FRANDSEN RD/TR 272

Good

Over: SILVER CREEK

2MI NW OF ALHAMBRA, Madison, IL

Built 1996 Load: 32.4 t ADT: 100

TWIN HILL LN/TR 19

Good

Over: TRIB TO SILVER CREEK

2.5MI S OF HAMEL, Madison, IL

Built 1996 Load: 32.4 t ADT: 50

LUDWIG RD (TR 372)

Good

Over: EAST FORK SILVER CR.

1.0MI NE GRANTFORK, Madison, IL

Built 2000 Load: 32.4 t ADT: 75

JOHNSTON RD (TR 28

Good

Over: CORLOCK BRANCH

2.5MI SEMARINE, Madison, IL

Built 1999 Load: 32.4 t ADT: 100

MC COY RD

Good

Over: E FK WOODRIVER CK

1.5 MI NW BETHALTO, Madison, IL

Built 2000 Load: 32.4 t ADT: 625

TRESTLE RD TR 289

Good

Over: SUGAR CK

2.0MI NE HIGHLAND, Madison, IL

Built 2000 Load: 32.4 t ADT: 600

FAS 2735

Good

Over: PADDOCK CREEK

2.4 MI W PRAIRIETOWN, Madison, IL

Built 2000 Load: 32.4 t ADT: 1,850

FAS 2735

Good

Over: BRANCH OF PADDOCK CK

1.75 W PRAIRIETOWN, Madison, IL

Built 2000 Load: 32.4 t ADT: 1,850

RIDGEVIEW RD.

Good

Over: LITTLE MOONEY CK

IL RT. 143 INTERSECT, Madison, IL

Built 2002 Load: 32.4 t ADT: 1,550

WOOD STATION RD/TR

Good

Over: W FK WOODRIVER CREEK

2.5MI N EAST ALTON, Madison, IL

Built 2002 Load: 32.4 t ADT: 375

YANN RD/TR 298

Good

Over: SAND CREEK

2.5 MI E MARINE, Madison, IL

Built 2006 Load: 32.4 t ADT: 100

W MILL CR RD TR 36

Good

Over: MILL CREEK

2.5M S OF TROY, Madison, IL

Built 2006 Load: 32.4 t ADT: 150

FAS 766/FRUIT RD

Good

Over: SUGAR FORK

4.7 W GRANTFORK, Madison, IL

Built 2007 Load: 32.4 t ADT: 375

CYPRESS RD/ TR258

Good

Over: TRIB TO LAKE FORK

2.5MI SW ST. JACOB, Madison, IL

Built 2005 Load: 32.4 t ADT: 100

TR 80 WOLF RD

Good

Over: LICK BR

1.25M N OF ALTON, Madison, IL

Built 2008 Load: 32.4 t ADT: 175

MICHAEL RD/TR 305A

Good

Over: SUGAR CK

1.5MI E HIGHLAND, Madison, IL

Built 2011 Load: 32.4 t ADT: 525

LIBBRA RD/TR67

Good

Over: SILVER CK

1.5MI SE LIVINGSTON, Madison, IL

Built 2009 Load: 32.4 t ADT: 100

CH 61 AIRPORT RD

Good

Over: TRIB LITTLE PIASA

.04MI S JERSEY CO, Madison, IL

Built 2010 Load: 32.4 t ADT: 200

CH 14 POSSUM HILL

Good

Over: CAHOKIA CK

2.0 MI W WORDEN, Madison, IL

Built 2010 Load: 32.4 t ADT: 300

TR 238A STAUNTON R

Good

Over: TRIB SILVER CR

2.2 MI S HAMEL, Madison, IL

Built 2011 Load: 32.4 t ADT: 200

TR 343 Kirsch Rd.

Good

Over: Mill Creek

1.5 MI S Troy, Madison, IL

Built 2012 Load: 32.4 t ADT: 500

TR 274 Cedar Road

Good

Over: Little Silver Creek

4.0 Mi S of St Jacob, Madison, IL

Built 2014 Load: 32.4 t ADT: 75

TR 244

Good

Over: TRIB TO CAHOKIA CK

0.5MI SW STAUNTON, Madison, IL

Built 2011 Load: 32.4 t ADT: 100

CH 13 Marine Rd.

Good

Over: Trib to Silver Creek

5 mi N of Marine, Madison, IL

Built 2011 Load: 32.4 t ADT: 175

FAU 9016 Moro Rd.

Good

Over: Indian Creek

1.5 Mi E Moro, Madison, IL

Built 2014 Load: 32.4 t ADT: 3,450

TR 365 Lilac Road

Good

Over: Fork Creek

2.0 Mi S St Jacob, Madison, IL

Built 2015 Load: 32.4 t ADT: 150

FAS 737 Seiler Rd

Good

Over: E Fork Wood River Ck

1.3 Mi E Fosterburg, Madison, IL

Built 2015 Load: 32.4 t ADT: 1,500

CH-55 (Woodburn Rd

Good

Over: Br E Frk Wood River

2.0 Mi NE Fosterburg, Madison, IL

Built 2017 Load: 32.4 t ADT: 925

TR 261A E Mick Roa

Good

Over: Wendell Branch

3.0 Mi N of Troy, Madison, IL

Built 2017 Load: 32.4 t ADT: 200

TR 363 E Mill Ck R

Good

Over: North Fork Mill Ck

4 Mi SE Troy, Madison, IL

Built 2022 Load: 32.4 t ADT: 100

TR 171 Jerusalem R

Good

Over: Trib to Cahokia Cr

2 Mi SW of Carpenter, Madison, IL

Built 2020 Load: 32.4 t ADT: 250

FAU 8966

Good

Over: NS RR

0.40MI NORTH IL3, Madison, IL

Built 2009 Load: 32.4 t ADT: 1,025

MS-7910 N Rodgers

Good

Over: W Fork Wood River Cr

Alton- S of Beltline, Madison, IL

Built 2015 Load: 32.4 t ADT: 1,700

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

Related

Browse all → | Rankings →
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.