Total bridges
296
Public highway bridges in Marion County
County profile · official public datasets
Marion County, IL
296 public highway bridges tracked in the FHWA National Bridge Inventory: 62.5% rated Good, 31.1% Fair, 6.4% Poor.
- 296
- Public bridges
- 62.5%
- Good condition
- 6.4%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Marion County pairs a better-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- Top 32%
- lowest Poor share in state
- 6.4%
- Poor-condition share
- 296
- public highway bridges
- 1973
- 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.
Marion County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Marion County ranks #33 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 6.4%). Marion County, Illinois contains 296 public highway bridges. Roughly 62.5% are rated “Good,” 31.1% “Fair,” and 6.4% “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
62.5%
185 of 296 rated 7-9
Fair condition
31.1%
92 of 296 rated 5-6
Poor condition
6.4%
19 of 296 rated 4 or below
In-state Poor-share rank
#33 of 102
Among Illinois counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 296 NBI-tracked bridges by lowest applicable component rating.
Good 62.5% (185)
Fair 31.1% (92)
Poor 6.4% (19)
Marion County's Poor-condition bridges carry 8,285 vehicle crossings a day
That is 1.7% of the county's reported daily bridge traffic on 6.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 436 crossings a day against 1,404 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 295 of 296 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
44.3% of Marion County's bridges have passed the 50-year mark
131 of the 296 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 62.5% 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 47.1% of the county's Poor-condition bridge traffic
IL 161 - FAP 805 over FAI-57, built 1968, carries 3,900 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 19-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 8,285 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Marion County's bridges were built
296 bridges with a recorded construction year, grouped by decade
- 1900s
1900–1909
32 bridges
- 1910s 2
1910–1919
2 bridges
- 1920s 6
1920–1929
6 bridges
- 1930s 5
1930–1939
5 bridges
- 1940s 6
1940–1949
6 bridges
- 1950s 18
1950–1959
18 bridges
- 1960s
1960–1969
48 bridges
- 1970s
1970–1979
30 bridges
- 1980s
1980–1989
52 bridges
- 1990s
1990–1999
39 bridges
- 2000s
2000–2009
36 bridges
- 2010s 18
2010–2019
18 bridges
- 2020s 4
2020–2029
4 bridges
What this shows Construction peaked in the 1980s, when 52 of the county's bridges still in the inventory were built, which is 17.6% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year is 1973, 6 years older than the Illinois average of 1979.
How Marion County compares with Illinois's closest counties by inventory size
The 5 Illinois counties nearest Marion County in number of bridges, with their condition splits. Its 6.4% Poor share is the 2nd-lowest of these 6. Its average build year of 1973 against a peer-group mean of 1980 is 7 years older.
Showing the 5 closest of 101 Illinois counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Coles County | 304 | 39.5% | 51.6% | 8.9% | 1981 |
| Knox County | 304 | 49.3% | 39.5% | 11.2% | 1982 |
| Ford County | 302 | 55.6% | 38.1% | 6.3% | 1983 |
| Marion County (this page) | 296 | 62.5% | 31.1% | 6.4% | 1973 |
| Hancock County | 292 | 41.8% | 38% | 20.2% | 1977 |
| Logan County | 292 | 29.8% | 62% | 8.2% | 1975 |
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 Marion 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 Marion County, both outside Illinois so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside IL (296 bridges here).
- Vigo County, IN · 296 bridges
- Story County, IA · 296 bridges
- Guadalupe County, TX · 296 bridges
- Clark County, WI · 296 bridges
Similar average build year
Nearest mean year-built outside IL (1973 here).
- Jefferson County, AL · avg 1973 · 1,068 bridges
- Erie County, NY · avg 1973 · 906 bridges
- Davidson County, TN · avg 1973 · 832 bridges
- Lancaster County, PA · avg 1973 · 801 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (92)
FAS-795
FairOver: SKILLET FORK CREEK
1 MI W HELM, Marion, IL
Built 1946 Load: 0.0 t ADT: 1,000
FAS-795
FairOver: POPLAR CREEK
0.5 MI N HELM, Marion, IL
Built 1940 Load: 0.0 t ADT: 1,000
TR-46
FairOver: FLAT CREEK
1 MI NW VERNON, Marion, IL
Built 1961 Load: 0.0 t ADT: 50
TR-285
FairOver: ICG RR
4.5 MI N HELM, Marion, IL
Built 1909 Load: 12.6 t ADT: 10
IL 161 - FAP 805
FairOver: W Trib Raccoon Crk
1.4mi E US51 in Centralia, Marion, IL
Built 1930 Load: 13.9 t ADT: 8,550
KIN LOU RD-FAS 270
FairOver: SCHNEIDER SPRINGS BR
1 MI E KINMUNDY, Marion, IL
Built 1909 Load: 17.5 t ADT: 1,100
FAS-1787
FairOver: VERMILLION CREEK
1 MI W SALEM, Marion, IL
Built 1909 Load: 19.4 t ADT: 600
TR-219
FairOver: VERMILION CREEK
1 MI W SALEM, Marion, IL
Built 1909 Load: 19.4 t ADT: 500
TR-254
FairOver: FULKS CREEK
S PART SALEM, Marion, IL
Built 1966 Load: 19.4 t ADT: 725
TR-261
FairOver: VERMILION CREEK
2 MI S SALEM, Marion, IL
Built 1909 Load: 19.4 t ADT: 150
TR 270
FairOver: NORTH FORK
4 MI NW KINMUNDY, Marion, IL
Built 1918 Load: 19.4 t ADT: 25
IL 37 (FAS 2826)
FairOver: RACCOON CREEK SOUTH
1.4 MI S ILL-161, Marion, IL
Built 1930 Load: 21.7 t ADT: 4,500
TR-107
FairOver: SKILLET FORK
2.5 MI E FORBES S P, Marion, IL
Built 1909 Load: 21.7 t ADT: 50
US 50
FairOver: Trib to Turkey Creek
1 MI E ODIN, Marion, IL
Built 1951 Load: 22.0 t ADT: 6,700
TR-38
FairOver: CROOKED CREEK
1 MI E CENTRAL CITY, Marion, IL
Built 1909 Load: 22.0 t ADT: 150
US 50
FairOver: Brubaker Creek
2 MI E SALEM, Marion, IL
Built 1952 Load: 23.3 t ADT: 3,750
OLD US 51 (SBI 2C)
FairOver: WEBSTER CREEK
1.5 MI S WAMAC, Marion, IL
Built 1920 Load: 24.0 t ADT: 150
OLIVE STREET 2455A
FairOver: TOWN CREEK
SALEM, Marion, IL
Built 1964 Load: 24.0 t ADT: 275
KIN LOU RD-FAS 270
FairOver: LOST FORK
4 MI W CLAY CO LN, Marion, IL
Built 1909 Load: 24.3 t ADT: 575
CH-38
FairOver: PERKINS BRANCH
3 MI E VERNON, Marion, IL
Built 1909 Load: 24.3 t ADT: 75
CH-40
FairOver: HORSE CREEK
3.5 MI E KELL, Marion, IL
Built 1909 Load: 24.3 t ADT: 100
TR-6
FairOver: LOUSE CREEK
2 MI SW PATOKA, Marion, IL
Built 1971 Load: 24.3 t ADT: 175
TR-58A
FairOver: NORTH FORK
1 MI N PATOKA, Marion, IL
Built 1960 Load: 24.3 t ADT: 25
TR-120
FairOver: FLAT CREEK
1.5 MI NE VERNON, Marion, IL
Built 1909 Load: 24.3 t ADT: 50
TR-170
FairOver: NORTH FORK
3.5 MI ESE VERNON, Marion, IL
Built 1921 Load: 24.3 t ADT: 25
TR-176
FairOver: NORTH FORK
4 MI ESE VERNON, Marion, IL
Built 1909 Load: 24.3 t ADT: 25
TR-201
FairOver: DUMS CREEK
3.5 MI E SALEM, Marion, IL
Built 1909 Load: 24.3 t ADT: 75
FAS-787
FairOver: NORTH FORK CREEK
1 MI W PATOKA, Marion, IL
Built 1976 Load: 24.3 t ADT: 350
TR-445B
FairOver: WEBSTER CREEK
0.5 MI S CENTRALIA, Marion, IL
Built 1909 Load: 24.3 t ADT: 25
FAU 8591
FairOver: MARTIN BRANCH
1 MI E CENTRAL CITY, Marion, IL
Built 1941 Load: 24.3 t ADT: 2,450
SE 7TH STREET
FairOver: CREEK
SANDOVAL, Marion, IL
Built 1909 Load: 24.3 t
TR-415
FairOver: SCHWARTZ BRANCH
1 MI NW WALNUT HILL, Marion, IL
Built 1909 Load: 24.3 t ADT: 75
JEFFERSON AVE 7520
FairOver: TOWN CREEK
SALEM, Marion, IL
Built 1964 Load: 24.3 t ADT: 425
FAS-1793
FairOver: CROOKED CREEK
3.5 MI E CENTRAL CTY, Marion, IL
Built 1984 Load: 24.6 t ADT: 625
US 51 (FAP 322)
FairOver: LOUSE RUN TRIBUTARY
7.5 MI S FAYETTE C L, Marion, IL
Built 1920 Load: 25.3 t ADT: 2,750
CH-30
FairOver: SKILLET FORK
1 MI SW HELM, Marion, IL
Built 1915 Load: 25.3 t ADT: 75
TR-51
FairOver: SKILLET CREEK
6.5 MI E KINMUNDY, Marion, IL
Built 1909 Load: 25.9 t ADT: 50
TR-336
FairOver: BRUBAKER CREEK
2.5 MI E SALEM, Marion, IL
Built 1909 Load: 25.9 t ADT: 25
TR-466
FairOver: BRANCH
1 MI SE FARINA, Marion, IL
Built 1978 Load: 25.9 t ADT: 100
IL 37
FairOver: RACCOON CR TRB NORTH
.25 MI S ILL-161, Marion, IL
Built 1930 Load: 26.2 t ADT: 4,500
OLD US 51 (FAS 179
FairOver: PRAIRIE CREEK
.2 MI S SANDOVAL, Marion, IL
Built 1954 Load: 26.9 t ADT: 1,050
FAS-1793
FairOver: CROOKED CREEK
3 MI S ODIN, Marion, IL
Built 1987 Load: 26.9 t ADT: 625
US 50
FairOver: W Trib to Prairie Cr
NE OF SANDOVAL, Marion, IL
Built 1923 Load: 27.5 t ADT: 6,050
OAK STREET 6900
FairOver: FAP-805 (ILL-161)
CENTRALIA, Marion, IL
Built 1954 Load: 27.5 t ADT: 150
IL 37 (FAS 2701)
FairOver: SCHNEIDER SPRINGS BR
2 MI S FARINA, Marion, IL
Built 1952 Load: 28.8 t ADT: 1,200
FAI-57 NB
FairOver: US 50 (FAP-99)
SALEM INT, Marion, IL
Built 1968 Load: 29.2 t ADT: 9,650
US 51 (FAP 322)
FairOver: E FORK KASKASKIA OVF
9.6 MI S FAYETTE C L, Marion, IL
Built 1958 Load: 31.8 t ADT: 2,750
FAU-8591 (CH-11
FairOver: RACCOON CREEK
1 MI E CENTRAL CITY, Marion, IL
Built 1987 Load: 31.8 t ADT: 2,450
TR-218A
FairOver: WILLS CREEK
4 MI W ALMA, Marion, IL
Built 2010 Load: 32.1 t ADT: 25
KINOKA RD (FAS 271
FairOver: FAI-57
KINMUNDY INT, Marion, IL
Built 1968 Load: 32.4 t ADT: 950
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.