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.
Good-condition bridges (185)
TR-215
GoodOver: PRAIRE CREEK
0.5 MI N ODIN, Marion, IL
Built 1983 Load: 39.5 t ADT: 50
TR-139
GoodOver: DUMS CREEK
2 MI E ALMA, Marion, IL
Built 1984 Load: 39.5 t ADT: 25
TR-160
GoodOver: KASKASKIA RIVER
4 MI E PATOKA, Marion, IL
Built 1991 Load: 39.5 t ADT: 50
FAS-2794
GoodOver: E FK KASKASKIA RIVER
1.7 MI N KINMUNDY, Marion, IL
Built 1987 Load: 39.9 t ADT: 350
TR 64 Norton Road
GoodOver: Turkey Creek
1.5 Mi E of Junction City, Marion, IL
Built 2021 Load: 40.2 t ADT: 200
PERRY LANE (FAS178
GoodOver: FAI-57
4 MI S KINMUNDY INT, Marion, IL
Built 1968 Load: 40.5 t ADT: 1,400
US 50
GoodOver: DUMS CREEK WEST
4 MI E SALEM, Marion, IL
Built 1952 Load: 40.5 t ADT: 3,750
TR-201
GoodOver: BRUBAKER CREEK
2 MI E SALEM, Marion, IL
Built 1984 Load: 40.5 t ADT: 75
US 51 NB (FAP 322)
GoodOver: CROOKED CREEK
N OF CENTRAL CITY, Marion, IL
Built 1982 Load: 40.8 t ADT: 4,050
TR-1
GoodOver: WEBSTER CREEK
4 MI W WALNUT HILL, Marion, IL
Built 1982 Load: 40.8 t ADT: 225
US 51 (FAP 322)
GoodOver: WEBSTER CREEK
.8 MI N JEFFERSN C L, Marion, IL
Built 1960 Load: 41.1 t ADT: 7,200
CH-23
GoodOver: DUMS CREEK
7.5 MI S KINMUNDY, Marion, IL
Built 1979 Load: 41.8 t ADT: 250
US 50
GoodOver: CROOKED CREEK
.25 MI E SALEM, Marion, IL
Built 1952 Load: 42.4 t ADT: 4,850
FAI-57
GoodOver: BR E FORK KASKASKIA
.5 MI N KIMUNDY INT, Marion, IL
Built 1970 Load: 42.4 t ADT: 18,100
TR 297 River Rd
GoodOver: Skillet Fork Creek
3 Mi SE of Iuka, Marion, IL
Built 2021 Load: 43.1 t ADT: 75
SBI-142 (ILL-37)
GoodOver: RACCOON CREEK MIDDLE
1 MILE S OF IL 161, Marion, IL
Built 1997 Load: 43.4 t ADT: 4,500
TR-254
GoodOver: Crooked Crk Overflow
2.5 Mi S Rt. 50, Marion, IL
Built 2019 Load: 43.4 t ADT: 725
US 50
GoodOver: BRUBAKER CREEK TRIB
3.6 MI E OF IL 37, Marion, IL
Built 2016 Load: 44.1 t ADT: 3,750
Kinlou Rd-FAS 2703
GoodOver: Trib to Skillet Fork
0.1 Mi W Clay Co Ln, Marion, IL
Built 2021 Load: 45.0 t ADT: 500
CH 30 Kell Road
GoodOver: Horse Creek
3.75 Mi E of Kell, Marion, IL
Built 2017 Load: 45.7 t ADT: 225
US 50
GoodOver: PRAIRIE CREEK
2 MI E US-51, Marion, IL
Built 1996 Load: 46.3 t ADT: 6,050
TR 293
GoodOver: South Creek
1.5 Mi. S. Salem, Marion, IL
Built 2022 Load: 46.7 t ADT: 35
FAS 2792
GoodOver: NORTH FORK CREEK
4.5 MI N ALMA, Marion, IL
Built 2006 Load: 47.0 t ADT: 50
US 51 (FAP 322)
GoodOver: FLAT CREEK
.4 MI S FAYETTE C L, Marion, IL
Built 1960 Load: 47.6 t ADT: 2,650
US 50
GoodOver: LACKEY CREEK
E UP RR IN SALEM, Marion, IL
Built 2010 Load: 48.3 t ADT: 6,800
US 50
GoodOver: SKILLET FORK CREEK
2 MI E CLAY CO LN, Marion, IL
Built 2007 Load: 49.6 t ADT: 2,550
CH 5 Marshall Crk
GoodOver: Jims Creek
4 Mi SE of Patoka, Marion, IL
Built 2018 Load: 49.6 t ADT: 175
US 50
GoodOver: DUMS CREEK
3 MI W CLAY CO LN, Marion, IL
Built 2006 Load: 53.1 t ADT: 2,550
US 51 SB (FAP 322)
GoodOver: FULTON CREEK
CENTRALIA, Marion, IL
Built 1960 Load: 53.5 t ADT: 2,450
US 50
GoodOver: VERMILLION CREEK
.25 MI E SELMAVIL RD, Marion, IL
Built 1994 Load: 54.1 t ADT: 10,300
US 51 NB (FAP 322)
GoodOver: FULTON CREEK
CENTRALIA, Marion, IL
Built 1960 Load: 56.1 t ADT: 3,450
US 51 (FAP 322)
GoodOver: N FORK KASKASKIA RIV
1.5 MI S VERNON, Marion, IL
Built 2010 Load: 64.5 t ADT: 2,750
IL 161 - FAP 805
GoodOver: Trib Centralia Resvr
2 MI E CENTRALIA, Marion, IL
Built 1974 Load: 68.4 t ADT: 5,150
FAI-57
GoodOver: RACCOON CREEK
2.8 MI N JEFF CO LN, Marion, IL
Built 1966 Load: 97.2 t ADT: 25,000
FAI-57
GoodOver: N TRIB E BR KASK RVR
NE OF KINMUNDY, Marion, IL
Built 1969 Load: 97.2 t ADT: 18,100
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.