Total bridges
523
Public highway bridges in Madison County
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.
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
- 1900s 12
1900–1909
12 bridges
- 1910s 3
1910–1919
3 bridges
- 1920s 6
1920–1929
6 bridges
- 1930s 19
1930–1939
19 bridges
- 1940s 12
1940–1949
12 bridges
- 1950s 33
1950–1959
33 bridges
- 1960s
1960–1969
101 bridges
- 1970s
1970–1979
47 bridges
- 1980s
1980–1989
91 bridges
- 1990s
1990–1999
76 bridges
- 2000s
2000–2009
71 bridges
- 2010s
2010–2019
41 bridges
- 2020s 11
2020–2029
11 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).
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.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Livingston County | 579 | 51.8% | 39.9% | 8.3% | 1978 |
| Iroquois County | 570 | 46.5% | 39.1% | 14.4% | 1980 |
| LaSalle County | 528 | 39.4% | 48.3% | 12.3% | 1978 |
| Madison County (this page) | 523 | 49.3% | 42.3% | 8.4% | 1979 |
| Vermilion County | 494 | 27.7% | 65% | 7.3% | 1979 |
| St. Clair County | 486 | 50% | 40.9% | 9.1% | 1977 |
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).
- Rapides County, LA · 523 bridges
- Kent County, MI · 523 bridges
- Williamson County, TN · 520 bridges
- New Castle County, DE · 527 bridges
Similar average build year
Nearest mean year-built outside IL (1979 here).
- Pima County, AZ · avg 1979 · 1,150 bridges
- Jefferson County, KY · avg 1979 · 662 bridges
- Spartanburg County, SC · avg 1979 · 638 bridges
- McPherson County, KS · avg 1979 · 586 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Good-condition bridges (258)
ILL 157
GoodOver: SCHOOLHOUSE BRANCH
N JCT BELT 40 & 157, Madison, IL
Built 1933 Load: 47.6 t ADT: 15,000
Marine Road-FAS 77
GoodOver: East Fork SILVER CRK
1.4 mi N. of US 40, Madison, IL
Built 1993 Load: 48.0 t ADT: 800
ILL 4
GoodOver: FAI 55
0.5 MI E WORDEN, Madison, IL
Built 1955 Load: 48.3 t ADT: 4,200
ILL 143
GoodOver: FAI-55
2M E EDWARDSVILLE, Madison, IL
Built 1956 Load: 48.3 t ADT: 6,800
IL 255 NB
GoodOver: CAHOKIA DIVERSION
S. CORP LMTS ROXANNA, Madison, IL
Built 1995 Load: 48.3 t ADT: 28,300
IL 255 SB
GoodOver: CAHOKIA DIVERSION
S. CORP LMTS ROXANNA, Madison, IL
Built 1995 Load: 48.3 t ADT: 28,300
ILL 4
GoodOver: FAI 70
1.75 M S OF 143 & 4, Madison, IL
Built 1964 Load: 48.6 t ADT: 8,200
IL 255 SB (FAP310S
GoodOver: FAP 789 IL 143
IN ROXANNA, Madison, IL
Built 1995 Load: 48.6 t ADT: 23,000
ILL 4
GoodOver: Trib E Fk Silver Crk
.8 MI S US 40, Madison, IL
Built 1980 Load: 48.6 t ADT: 7,000
ILL 3 NB
GoodOver: CAHOKIA DIVERSION
2.5 MI N FAI 270, Madison, IL
Built 2000 Load: 48.9 t ADT: 13,800
ILL 3 SB
GoodOver: CAHOKIA DIVERSION
2.5MI N FAI 270, Madison, IL
Built 2000 Load: 48.9 t ADT: 13,800
US 67 NB
GoodOver: TRIB S BR PIASA CRK
1.5MI SO. JERSEY CO, Madison, IL
Built 2009 Load: 48.9 t ADT: 11,200
TR 228 BLACKJACK R
GoodOver: N FK MILL CK
3.0MI SE TROY, Madison, IL
Built 2012 Load: 48.9 t ADT: 200
IL 203
GoodOver: NSRR UPRR Access Rd
2.4mi N of I-55/70, Madison, IL
Built 1992 Load: 49.2 t ADT: 13,000
IL 255 NB & Ramp C
GoodOver: UPRR KCSRR
0.25mi NW of Humbert Rd, Madison, IL
Built 2010 Load: 49.2 t ADT: 9,850
TR 234
GoodOver: SILVER CK
2.5 MI NE TROY, Madison, IL
Built 1975 Load: 49.9 t ADT: 400
TR 123
GoodOver: TRIB TO SILVER CK
5 MI NW ALHAMBRA, Madison, IL
Built 1980 Load: 49.9 t ADT: 75
BENDER AVE TR 88C
GoodOver: FAP 310
SOUTH OF 111/140, Madison, IL
Built 2001 Load: 50.2 t ADT: 600
VONNAHMEN RD
GoodOver: IL 255 - FAP 310
1 MILE W FOSTERBURG, Madison, IL
Built 2006 Load: 50.2 t ADT: 200
FAS 777 NEW DOUGLA
GoodOver: TRIB. TO SILVER CRK
.6 MI EAST OF I-55, Madison, IL
Built 2002 Load: 50.9 t ADT: 1,700
TR 123
GoodOver: Trib to Silver Ck
2 Mi N. Alhambra, Madison, IL
Built 2022 Load: 51.5 t ADT: 75
BUCHTA ROAD/TR 153
GoodOver: TRIB TO INDIAN CREEK
4.0 M NW EDWARDSVLL, Madison, IL
Built 1984 Load: 51.8 t ADT: 1,300
IL 143
GoodOver: NSRR
ALTON EAST OF CLARK, Madison, IL
Built 1995 Load: 52.2 t ADT: 9,300
LEBANON RD/FAU 912
GoodOver: CANTEEN CREEK
.17 W. TR 361, Madison, IL
Built 2003 Load: 52.2 t ADT: 1,750
FAI 255 NB
GoodOver: I-55/70
And over Ramps 5+6, Madison, IL
Built 1986 Load: 52.5 t ADT: 21,850
US 67
GoodOver: SO BR PIASA CREEK
1.3MI S JERSEY CO LN, Madison, IL
Built 1988 Load: 52.5 t ADT: 11,200
IL 255 NB (FAP 310
GoodOver: IL 111
N OF IL 143, Madison, IL
Built 2001 Load: 52.8 t ADT: 20,200
FAI 255 SB
GoodOver: I-55/70
And over Ramps 5+6, Madison, IL
Built 1986 Load: 53.5 t ADT: 21,850
IL 143
GoodOver: SILVER CREEK
3 MILES WEST OF IL 4, Madison, IL
Built 2007 Load: 53.5 t ADT: 4,650
IL 157 (FAS 766)
GoodOver: MOONEY CREEK
0.8 MI NO. OF EVILLE, Madison, IL
Built 1999 Load: 53.8 t ADT: 4,600
IL 255 NB - FAP 31
GoodOver: IL 111/IL 267
at GODFREY, Madison, IL
Built 2012 Load: 54.1 t ADT: 6,500
IL 255 SB - FAP 31
GoodOver: IL 111/IL 267
at GODFREY, Madison, IL
Built 2012 Load: 54.1 t ADT: 6,500
IL 157
GoodOver: Trib to Silver Creek
Just S of Hamel CL, Madison, IL
Built 2019 Load: 54.8 t ADT: 2,550
IL 143
GoodOver: SUGAR CREEK
1MI W OF PIERRON, Madison, IL
Built 2014 Load: 55.1 t ADT: 2,750
IL 255 SB
GoodOver: UPRR KCSRR
0.25mi NW of Humbert Rd, Madison, IL
Built 2009 Load: 56.4 t ADT: 9,850
IL 160
GoodOver: SILVER CREEK
.6 MI S.OF GRANTFORK, Madison, IL
Built 2006 Load: 56.4 t ADT: 2,100
FAU 8998/SEMINARY
GoodOver: TRIB TO HONEY BR
1.0 MI N OF ALTON, Madison, IL
Built 1980 Load: 56.4 t ADT: 5,300
IL 4
GoodOver: SILVER CREEK
1.9MI S OF IL 140, Madison, IL
Built 2006 Load: 57.3 t ADT: 4,350
IL 4
GoodOver: LAKE FORK CREEK
2.8 MI S JCT 4 & 40, Madison, IL
Built 2006 Load: 58.3 t ADT: 7,000
IL 157
GoodOver: SUGAR CREEK
.8 M N EDWARDSVILLE, Madison, IL
Built 2013 Load: 59.3 t ADT: 4,600
IL 157
GoodOver: BR OF DELAPLAINE CRK
AT WOODLAND SCHOOL, Madison, IL
Built 2002 Load: 59.6 t ADT: 9,850
IL 4
GoodOver: E FORK SILVER CRK
.71 MI N US 40, Madison, IL
Built 2017 Load: 59.9 t ADT: 7,400
I-270 EB & WB
GoodOver: CHAIN OF ROCKS CANAL
2 MI E MISSISSIPPI R, Madison, IL
Built 2014 Load: 60.3 t ADT: 46,200
IL 255 SB
GoodOver: WEST FK WOODRIVER CK
1.2 W FOSTERBURG RD, Madison, IL
Built 2006 Load: 60.6 t ADT: 14,900
CH 76 Possum Hill
GoodOver: Sherry Creek
2.0 Mi N Carpenter, Madison, IL
Built 2023 Load: 60.9 t ADT: 350
ILL 143
GoodOver: FAI 70
1.9 M E MARINE, Madison, IL
Built 1964 Load: 62.2 t ADT: 8,850
FAI 70
GoodOver: SUGAR CREEK
0.3 M W BOND CO, Madison, IL
Built 1965 Load: 63.8 t ADT: 26,900
IL 255 NB
GoodOver: WEST FK WOODRIVER CK
1.2 W FOSTERBURG RD, Madison, IL
Built 2006 Load: 64.5 t ADT: 14,900
IL 143
GoodOver: STREAM
0.5M E US 67 Dscvry, Madison, IL
Built 1994 Load: 65.8 t ADT: 9,300
FAI 55 FR#1709
GoodOver: STREAM
SE FAI 55 LIVINGSTON, Madison, IL
Built 1973 Load: 89.1 t ADT: 200
Read our methodology - how this data is sourced, computed, and verified.
Related
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.