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)
CH-19
GoodOver: SOUTH CREEK
0.5 MI NE CARTTER, Marion, IL
Built 1993 Load: 33.4 t ADT: 325
US 51 (FAP 322)
GoodOver: LOUSE CREEK
5.8 MI S FAYETTE C L, Marion, IL
Built 1959 Load: 33.7 t ADT: 2,250
TR-246
GoodOver: RACCOON CREEK
2.5 MI SW CARTTER, Marion, IL
Built 1968 Load: 34.3 t ADT: 75
TR-470
GoodOver: PAINTROCK CREEK
2.5 MI W HELM, Marion, IL
Built 1984 Load: 34.3 t ADT: 50
TR-201
GoodOver: CROOKED CREEK
1 MI NE SALEM, Marion, IL
Built 1981 Load: 35.0 t ADT: 325
TR-64
GoodOver: LOST CREEK
2 MI NW ODIN, Marion, IL
Built 1983 Load: 35.0 t ADT: 50
TR-278
GoodOver: SOUTH CREEK
1.5 MI N CARTTER, Marion, IL
Built 1984 Load: 35.0 t ADT: 100
TR-116
GoodOver: DAVIDSON CREEK
3 MI N ODIN, Marion, IL
Built 1987 Load: 35.0 t ADT: 125
TR-297
GoodOver: BRANCH FULTON CREEK
3 MI S IUKA, Marion, IL
Built 1992 Load: 35.0 t ADT: 75
KELL ROAD (TR 435)
GoodOver: FAI-57
2 MI S ILL 161 INT, Marion, IL
Built 1966 Load: 35.3 t ADT: 150
TR-414A
GoodOver: E FK KASKASKIA RIVER
2 MI NE KINMUNDY, Marion, IL
Built 1984 Load: 35.3 t ADT: 50
TR-13
GoodOver: NORTH FORK CREEK
3.5 MI NW KINMUNDY, Marion, IL
Built 1985 Load: 35.3 t ADT: 25
TR-317
GoodOver: SOUTH CREEK
1.5 MI NE CARTTER, Marion, IL
Built 1985 Load: 35.3 t ADT: 75
KIN LOU RD-FAS 270
GoodOver: SKILLET FORK
1 MI W CLAY CO LN, Marion, IL
Built 1997 Load: 35.6 t ADT: 500
TR-280
GoodOver: CROOKED CREEK
2 MI SE SALEM, Marion, IL
Built 1977 Load: 35.6 t ADT: 225
TR-16
GoodOver: PRAIRIE CREEK
0.5 MI SW SANDOVAL, Marion, IL
Built 1985 Load: 35.6 t ADT: 225
TR-131
GoodOver: E FK KASKASKIA RIVER
3 MI SW PATOKA, Marion, IL
Built 1982 Load: 35.6 t ADT: 50
FAS-2789
GoodOver: LOST CREEK
0.5 MI S FORBES ST P, Marion, IL
Built 1992 Load: 35.6 t ADT: 350
TOWNHOUSE RD(TR 15
GoodOver: FAI-57
4.75 MI N SALEM INT, Marion, IL
Built 1968 Load: 36.0 t ADT: 50
IL 37 / FAU 8565
GoodOver: Town Creek
SALEM, Marion, IL
Built 2002 Load: 36.0 t ADT: 5,800
TR-188
GoodOver: DAVIDSON CREEK
1 MI SW TONTI, Marion, IL
Built 1980 Load: 36.0 t ADT: 75
FAS-2791
GoodOver: RACCOON CREEK
1.5 MI W WALNUT HILL, Marion, IL
Built 1987 Load: 36.0 t ADT: 375
TR-226
GoodOver: E Fk Kaskaskia River
4.0M NW Alma, Marion, IL
Built 1977 Load: 36.6 t ADT: 50
TR-277
GoodOver: SOUTH CREEK
2 MI S SALEM, Marion, IL
Built 1984 Load: 36.6 t ADT: 75
US 50
GoodOver: ICRR
Odin, Marion, IL
Built 1998 Load: 36.9 t ADT: 6,700
US 50
GoodOver: TOWN CREEK
W CE&I RR IN SALEM, Marion, IL
Built 1994 Load: 36.9 t ADT: 6,750
CH-5
GoodOver: LOUSE CREEK
3 MI E PATOKA, Marion, IL
Built 1983 Load: 36.9 t ADT: 225
CH-30
GoodOver: ICG RR
S EDGE HELM, Marion, IL
Built 1991 Load: 37.3 t ADT: 75
US 51 NB
GoodOver: BNSFRR
1 mi S of Centralia, Marion, IL
Built 1993 Load: 37.6 t ADT: 6,900
US 51 SB (FAP 60)
GoodOver: BURLINGTON NORTHERN
1 MI S CENTRALIA, Marion, IL
Built 1993 Load: 37.6 t ADT: 6,900
FAS-1786
GoodOver: WARREN BRANCH
2 MI NE ALMA, Marion, IL
Built 1985 Load: 37.6 t ADT: 450
TR-218A
GoodOver: TRIB DAVISON CREEK
0.5 MI N TONTI, Marion, IL
Built 1993 Load: 37.6 t ADT: 275
CH-31
GoodOver: BRANCH SKILLET FORK
6 MI E KINMUNDY, Marion, IL
Built 1982 Load: 37.9 t ADT: 75
TR-45
GoodOver: E FK KASKASKIA RIVER
1 MI W KINMUNDY, Marion, IL
Built 1986 Load: 38.2 t ADT: 250
TR-359
GoodOver: SOUTH CREEK
0.5 MI E CARTTER, Marion, IL
Built 1987 Load: 38.2 t ADT: 100
TR-410A
GoodOver: DUMS CREEK
1.5 MI NW IUKA, Marion, IL
Built 1988 Load: 38.2 t ADT: 125
OLD US 51 (SBI 2)
GoodOver: LOUSE CREEK
.5 MI S PATOKA, Marion, IL
Built 1994 Load: 38.6 t ADT: 475
SBI 142 (ILL-37)
GoodOver: CROOKED CREEK
1.5MI S SALEM, Marion, IL
Built 1998 Load: 38.6 t ADT: 4,800
CH-20 TONTI RD
GoodOver: FAI-57
2.75 MI N SALEM INT, Marion, IL
Built 1967 Load: 38.9 t ADT: 700
CROSS ROAD (TR-249
GoodOver: FAI-57
1.5 MI S SALEM INT, Marion, IL
Built 1968 Load: 38.9 t ADT: 1,300
Selmaville Road
GoodOver: CROOKED CREEK
3.5 MI S US-50, Marion, IL
Built 1984 Load: 38.9 t ADT: 2,550
TR 218C
GoodOver: VERMILION CREEK
0.5 MI W SALEM, Marion, IL
Built 1985 Load: 38.9 t ADT: 600
TR-388
GoodOver: FULTON CREEK
4.5 MI NE CARTTER, Marion, IL
Built 1988 Load: 38.9 t ADT: 225
TR-138
GoodOver: CROOKED CREEK
3 MI SE ODIN, Marion, IL
Built 1990 Load: 38.9 t ADT: 100
TR-58A
GoodOver: DEER CREEK
N OF PATOKA, Marion, IL
Built 1992 Load: 38.9 t ADT: 100
FAS-1788
GoodOver: DUMS CREEK
1.5 MI E BRUBAKER, Marion, IL
Built 1961 Load: 39.2 t ADT: 300
WALNUT HILL RD(CH3
GoodOver: FAI-57
MAR-JEFF CO LINE, Marion, IL
Built 1966 Load: 39.5 t ADT: 750
US 51 (FAP 322)
GoodOver: PRAIRIE CREEK
S EDGE SANDOVAL, Marion, IL
Built 1982 Load: 39.5 t ADT: 3,900
TR-49
GoodOver: SCHNEIDER SPRINGS BR
1 MI NE KINMUNDY, Marion, IL
Built 1983 Load: 39.5 t ADT: 25
TR-96B
GoodOver: PRAIRIE CREEK
0.25 MI W ODIN, Marion, IL
Built 1982 Load: 39.5 t ADT: 150
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.