Total bridges
209
Public highway bridges in McDonough County
County profile · official public datasets
McDonough County, IL
209 public highway bridges tracked in the FHWA National Bridge Inventory: 53.6% rated Good, 39.7% Fair, 6.7% Poor.
- 209
- Public bridges
- 53.6%
- Good condition
- 6.7%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
McDonough County posts a better-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- Top 38%
- lowest Poor share in state
- 6.7%
- Poor-condition share
- 209
- public highway bridges
- 1981
- 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.
McDonough County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, McDonough County ranks #39 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 6.7%). McDonough County, Illinois contains 209 public highway bridges. Roughly 53.6% are rated “Good,” 39.7% “Fair,” and 6.7% “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
53.6%
112 of 209 rated 7-9
Fair condition
39.7%
83 of 209 rated 5-6
Poor condition
6.7%
14 of 209 rated 4 or below
In-state Poor-share rank
#39 of 102
Among Illinois counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 209 NBI-tracked bridges by lowest applicable component rating.
Good 53.6% (112)
Fair 39.7% (83)
Poor 6.7% (14)
McDonough County's Poor-condition bridges carry 4,270 vehicle crossings a day
That is 2.9% of the county's reported daily bridge traffic on 6.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 305 crossings a day against 229 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 209 of 209 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
25.8% of McDonough County's bridges have passed the 50-year mark
54 of the 209 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 53.6% 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 43.3% of the county's Poor-condition bridge traffic
ILL 9 over DROWNING FORK, built 1960, carries 1,850 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 4,270 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When McDonough County's bridges were built
209 bridges with a recorded construction year, grouped by decade
- pre-1900 1
Built before 1900
1 bridges
- 1900s 8
1900–1909
8 bridges
- 1910s 2
1910–1919
2 bridges
- 1920s 5
1920–1929
5 bridges
- 1930s 10
1930–1939
10 bridges
- 1940s 4
1940–1949
4 bridges
- 1950s 17
1950–1959
17 bridges
- 1960s 6
1960–1969
6 bridges
- 1970s 13
1970–1979
13 bridges
- 1980s
1980–1989
41 bridges
- 1990s
1990–1999
46 bridges
- 2000s
2000–2009
26 bridges
- 2010s
2010–2019
27 bridges
- 2020s 3
2020–2029
3 bridges
What this shows Construction peaked in the 1990s, when 46 of the county's bridges still in the inventory were built, which is 22% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year (1981) matches the Illinois average (1979).
How McDonough County compares with Illinois's closest counties by inventory size
The 5 Illinois counties nearest McDonough County in number of bridges, with their condition splits. Its 6.7% Poor share is the 4th-lowest of these 6. Its average build year of 1981 against a peer-group mean of 1983 is in line with the group.
Showing the 5 closest of 101 Illinois counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| White County | 214 | 29.4% | 64% | 6.5% | 1986 |
| Fulton County | 210 | 22.9% | 56.2% | 21% | 1977 |
| McDonough County (this page) | 209 | 53.6% | 39.7% | 6.7% | 1981 |
| Williamson County | 201 | 67.2% | 29.4% | 3.5% | 1985 |
| Warren County | 199 | 69.3% | 23.1% | 7.5% | 1985 |
| Crawford County | 197 | 33% | 60.9% | 6.1% | 1983 |
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 McDonough 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 McDonough County, both outside Illinois so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside IL (209 bridges here).
- Grant County, LA · 209 bridges
- Clinton County, OH · 209 bridges
- Iowa County, WI · 209 bridges
- Clinton County, IN · 210 bridges
Similar average build year
Nearest mean year-built outside IL (1981 here).
- Franklin County, OH · avg 1981 · 922 bridges
- Greenville County, SC · avg 1981 · 635 bridges
- Montgomery County, OH · avg 1981 · 632 bridges
- Shawnee County, KS · avg 1981 · 563 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (83)
TR 290
FairOver: TOWN FORK
SW-32-T7NR2W, McDonough, IL
Built 1977 Load: 38.2 t ADT: 25
SB US 67
FairOver: E FORK LAMOINE RIVER
1 MI N OF MACOMB, McDonough, IL
Built 1988 Load: 39.5 t ADT: 6,050
NB US 67
FairOver: E FORK LAMOINE RIVER
1 MI N OF MACOMB, McDonough, IL
Built 1988 Load: 39.5 t ADT: 6,050
TR 320
FairOver: CARTER CREEK
N.CTR-28-T4NR2W, McDonough, IL
Built 1900 Load: 39.5 t ADT: 75
ILL 9
FairOver: BAPTIST CREEK
2 MI E BLANDINSVILLE, McDonough, IL
Built 1997 Load: 40.2 t ADT: 1,600
ILL 41
FairOver: KJRY BNSFRRS
2.5 MI S OF BUSHNELL, McDonough, IL
Built 1938 Load: 40.5 t ADT: 3,000
FAP 315 IL 336EB
FairOver: TRIB KILLJORDAN CR
SOUTHWEST OF MACOMB, McDonough, IL
Built 2008 Load: 41.5 t ADT: 3,800
FAP-407 (IL-336WB)
FairOver: Trib Killjordon Crk
SW of Macomb, McDonough, IL
Built 2008 Load: 41.5 t ADT: 3,800
FAS-441 (CH-26)
FairOver: Hogwallow Branch
CTR-34-T4NR4W, McDonough, IL
Built 1969 Load: 41.5 t ADT: 175
IL 336
FairOver: WILDLIFE CROSSING
3.75MI N of US 136, McDonough, IL
Built 2015 Load: 42.4 t ADT: 1,600
IL 336
FairOver: CH 14
2.06MI N US 136, McDonough, IL
Built 2016 Load: 42.8 t ADT: 1,600
US 67
FairOver: TROUBLESOME CREEK
1.7 MI S OF US 136, McDonough, IL
Built 1923 Load: 43.4 t ADT: 2,400
CH 8
FairOver: E FORK LAMOINE RIVER
1 MI N COLCHESTER, McDonough, IL
Built 1956 Load: 44.4 t ADT: 1,200
IL 336EB
FairOver: BNSF RR
SW OF TENNESSEE, McDonough, IL
Built 2008 Load: 44.7 t ADT: 3,900
IL 336WB
FairOver: BNSF RR
SW OF TENNESSEE, McDonough, IL
Built 2008 Load: 44.7 t ADT: 3,900
US 67
FairOver: SHORT FORK TRIBUTARY
0.5 MI N GOOD HOPE, McDonough, IL
Built 1994 Load: 45.0 t ADT: 4,850
SB US 67
FairOver: E FORK CROOKED CREEK
1.2MI S WARREN CO LN, McDonough, IL
Built 1996 Load: 45.4 t ADT: 4,850
NB US 67
FairOver: E FORK CROOKED CREEK
1.21MI S WARRN CO LN, McDonough, IL
Built 1996 Load: 45.4 t ADT: 4,850
ILL 61
FairOver: BNSF RR (072826L)
SOUTH OF COLMAR, McDonough, IL
Built 1954 Load: 47.3 t ADT: 950
US 67
FairOver: GRINDSTONE CR
N EDGE OF INDUSTRY, McDonough, IL
Built 2007 Load: 47.3 t ADT: 2,300
TOWNSHIP RD 1100E
FairOver: IL 336
1.08MI W of US 67, McDonough, IL
Built 2015 Load: 47.3 t ADT: 125
US 136 (EB)
FairOver: E FORK La MOINE RIVR
1.4 MI W JCT 61 136, McDonough, IL
Built 2008 Load: 47.6 t ADT: 3,400
US 136 (WB)
FairOver: E FORK LA MOINE RIVR
1.4 MI W JCT 61 136, McDonough, IL
Built 2008 Load: 47.6 t ADT: 3,400
ILL 61
FairOver: La MOINE RIVER
1 MI S OF COLMAR, McDonough, IL
Built 2011 Load: 48.3 t ADT: 950
US 67
FairOver: CAMP CREEK
3 MI N OF INDUSTRY, McDonough, IL
Built 1924 Load: 48.6 t ADT: 2,300
US 136EB/WB
FairOver: IL 336
app 2mi w of Macomb, McDonough, IL
Built 2013 Load: 48.6 t ADT: 4,200
IL 9
FairOver: SHAW CREEK
0.75 MI E OF ILL 41, McDonough, IL
Built 2010 Load: 49.2 t ADT: 800
NB US 67
FairOver: FARMERS FORK
1 MI S OF ILL 9, McDonough, IL
Built 2012 Load: 50.9 t ADT: 6,350
SB US 67
FairOver: FARMERS FORK
1 MI S OF ILL 9, McDonough, IL
Built 2012 Load: 53.5 t ADT: 6,350
US 67
FairOver: WEST BRANCH SUGAR CR
.5 MI N OF ILL 101, McDonough, IL
Built 1966 Load: 55.7 t ADT: 2,600
IL 9
FairOver: N Fork Lamoine River
2 mi W of Bushnell, McDonough, IL
Built 2018 Load: 58.3 t ADT: 2,250
ILL 95
FairOver: BNSF RR (063798L)
.5 MI E OF ILL 41, McDonough, IL
Built 2016 Load: 60.6 t ADT: 1,650
FAP 407 IL 336
FairOver: TRIB KILLJORDAN CRK
0.2 MI NE TR 226, McDonough, IL
Built 2008 Load: 89.1 t ADT: 3,800
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.