Total bridges
230
Public highway bridges in Clark County
County profile · official public datasets
Clark County, IL
230 public highway bridges tracked in the FHWA National Bridge Inventory: 62.6% rated Good, 32.6% Fair, 4.8% Poor.
- 230
- Public bridges
- 62.6%
- Good condition
- 4.8%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Clark County posts a top-quartile lowest Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- Top 15%
- lowest Poor share in state
- 4.8%
- Poor-condition share
- 230
- public highway bridges
- 1978
- 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.
Clark County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Clark County ranks #15 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.8%). Clark County, Illinois contains 230 public highway bridges. Roughly 62.6% are rated “Good,” 32.6% “Fair,” and 4.8% “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
62.6%
144 of 230 rated 7-9
Fair condition
32.6%
75 of 230 rated 5-6
Poor condition
4.8%
11 of 230 rated 4 or below
In-state Poor-share rank
#15 of 102
Among Illinois counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 230 NBI-tracked bridges by lowest applicable component rating.
Good 62.6% (144)
Fair 32.6% (75)
Poor 4.8% (11)
Clark County's Poor-condition bridges carry 37,450 vehicle crossings a day
That is 8% of the county's reported daily bridge traffic on 4.8% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 3,405 crossings a day against 610 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 230 of 230 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
34.3% of Clark County's bridges have passed the 50-year mark
79 of the 230 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 62.6% 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 33.2% of the county's Poor-condition bridge traffic
I-70 (WB) over E LITTLE CREEK, built 1968, carries 12,450 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 11-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 37,450 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Clark County's bridges were built
230 bridges with a recorded construction year, grouped by decade
- 1900s 14
1900–1909
14 bridges
- 1940s 4
1940–1949
4 bridges
- 1950s 18
1950–1959
18 bridges
- 1960s
1960–1969
39 bridges
- 1970s
1970–1979
25 bridges
- 1980s
1980–1989
58 bridges
- 1990s
1990–1999
41 bridges
- 2000s 19
2000–2009
19 bridges
- 2010s 10
2010–2019
10 bridges
- 2020s 2
2020–2029
2 bridges
What this shows Construction peaked in the 1980s, when 58 of the county's bridges still in the inventory were built, which is 25.2% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1978) matches the Illinois average (1979).
How Clark County compares with Illinois's closest counties by inventory size
The 5 Illinois counties nearest Clark County in number of bridges, with their condition splits. Its 4.8% Poor share is the 2nd-lowest of these 6. Its average build year of 1978 against a peer-group mean of 1982 is in line with the group.
Showing the 5 closest of 101 Illinois counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Morgan County | 234 | 48.7% | 42.7% | 8.5% | 1984 |
| Washington County | 233 | 50.6% | 43.3% | 6% | 1973 |
| Douglas County | 232 | 76.3% | 22.4% | 1.3% | 1982 |
| Clark County (this page) | 230 | 62.6% | 32.6% | 4.8% | 1978 |
| Jackson County | 228 | 66.2% | 27.2% | 6.6% | 1987 |
| McHenry County | 227 | 41.4% | 38.3% | 20.3% | 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 Clark 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 Clark County, both outside Illinois so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside IL (230 bridges here).
- Johnson County, IN · 230 bridges
- Saline County, MO · 230 bridges
- Greer County, OK · 230 bridges
- Saline County, AR · 231 bridges
Similar average build year
Nearest mean year-built outside IL (1978 here).
- Orange County, CA · avg 1978 · 1,164 bridges
- Sumner County, KS · avg 1978 · 659 bridges
- Allen County, IN · avg 1978 · 613 bridges
- Buncombe County, NC · avg 1978 · 555 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (230)
CH 26(FAS 1658)
FairOver: N FORK EMBARRASS R
7.3 MI SE CASEY, Clark, IL
Built 1955 Load: 20.4 t ADT: 450
TR 262
FairOver: LITTLE CREEK
2 MI W WALNUT PRAIRI, Clark, IL
Built 1947 Load: 20.7 t ADT: 50
CH 8(FAS 688)
FairOver: E FORK EMBARRASS R
2.4 MI E WESTFIELD, Clark, IL
Built 1956 Load: 24.3 t ADT: 1,100
TR 134
FairOver: WILLOW CREEK
1.5 MI SE NEADMORE, Clark, IL
Built 1909 Load: 24.3 t ADT: 25
TR 327(FAS 2658)
FairOver: LITTLE WILLOW CREEK
4 MI NNE MOONSHINE, Clark, IL
Built 1909 Load: 24.3 t ADT: 75
TR 395
FairOver: STREAM
1.0 MI SE WEST UNION, Clark, IL
Built 1977 Load: 24.3 t ADT: 50
FAS 688(CH 8)
FairOver: N FORK EMBARRASS R
2.1 MI E WESTFIELD, Clark, IL
Built 1955 Load: 24.3 t ADT: 1,100
FAS 688(CH 8)
FairOver: E MILL CREEK
1 MI NW MARSHALL, Clark, IL
Built 1957 Load: 25.9 t ADT: 2,150
TR 262
FairOver: SNYDER CREEK
4.6 MI S MARSHALL, Clark, IL
Built 1909 Load: 28.8 t ADT: 300
FAP 832(IL 49)
FairOver: W FORK EMBARRASS R
N OF WESTFIELD, Clark, IL
Built 1995 Load: 29.2 t ADT: 1,050
CH 20(FAS 1660)
FairOver: I-70
3.5 MI W STATE LINE, Clark, IL
Built 1968 Load: 29.5 t ADT: 400
TR 107
FairOver: I-70
.75 MI W IL 1, Clark, IL
Built 1969 Load: 29.5 t ADT: 525
TR 198
FairOver: I-70
4.5 MI W IL 1, Clark, IL
Built 1969 Load: 29.8 t ADT: 125
TR 340
FairOver: I-70
3 MI W STATE LINE, Clark, IL
Built 1968 Load: 29.8 t ADT: 125
US 40(FAS 1707)
FairOver: STREAM
1.4 MI W MARTINSVILL, Clark, IL
Built 1955 Load: 29.8 t ADT: 2,750
UNION ST
FairOver: STOCKWELL BRANCH
SW MARTINSVILLE, Clark, IL
Built 1909 Load: 30.5 t ADT: 250
TR 189
FairOver: I-70
.5 MI W IL 49 INT, Clark, IL
Built 1969 Load: 30.8 t ADT: 275
CH 23
FairOver: I-70
2.5 MI W MARTINSVILL, Clark, IL
Built 1969 Load: 30.8 t ADT: 300
US 40(FAS1707)
FairOver: STREAM
W CLARK CENTER, Clark, IL
Built 1952 Load: 31.4 t ADT: 2,350
TR 265
FairOver: SNYDER CREEK
6 MI S MARSHALL, Clark, IL
Built 1980 Load: 31.4 t ADT: 75
US 40(FAS 1707)
FairOver: I-70
2 MI W STATE LINE, Clark, IL
Built 1968 Load: 32.4 t ADT: 4,300
US 40(FAS 1707)
FairOver: LITTLE CREEK
1.6 MI E MARTNSVILLE, Clark, IL
Built 1954 Load: 32.4 t ADT: 2,050
US 40(FAS 1707)
FairOver: HURRICANE CREEK
W OF CLARK CENTER, Clark, IL
Built 1955 Load: 32.4 t ADT: 2,350
FAI 70
FairOver: DITCH
1.5 MI NW MARSHALL, Clark, IL
Built 1971 Load: 32.4 t ADT: 23,400
TR 395
FairOver: N FORK RACCOON CREEK
2.8 MI S WEST UNION, Clark, IL
Built 1979 Load: 32.4 t ADT: 100
FAS 696(TR 142)
FairOver: WILLOW CREEK
3 MI SE MARTINSVILLE, Clark, IL
Built 1979 Load: 32.4 t ADT: 350
TR 339
FairOver: MOUNT BRANCH
2.0 MI NW MORIAH, Clark, IL
Built 1979 Load: 32.4 t ADT: 200
TR 207
FairOver: STREAM
6 MI ESE MARSHALL, Clark, IL
Built 1979 Load: 32.4 t ADT: 125
CH 20
FairOver: MUDD CREEK
1 MI NE DENNISON, Clark, IL
Built 1909 Load: 32.4 t ADT: 200
TR 251
FairOver: PARTRIDGE CREEK
1.5 MI E ERNST, Clark, IL
Built 1982 Load: 32.4 t ADT: 50
FAS 1658(CH 16)
FairOver: WILLOW CREEK
2.5 MI W ORANGE, Clark, IL
Built 1983 Load: 32.4 t ADT: 150
TR 325
FairOver: N FORK EMBARRASS R
5 MI SE OF CASEY, Clark, IL
Built 1985 Load: 32.4 t ADT: 100
TR 234
FairOver: MILL CREEK
5.5 MI S MARSHALL, Clark, IL
Built 1984 Load: 32.4 t ADT: 100
TR 101
FairOver: TRIB BIG CREEK
3 MI NE MARSHALL, Clark, IL
Built 1987 Load: 32.4 t ADT: 125
TR 46
FairOver: QUARRY BRANCH
2 MI SE OF CASEY, Clark, IL
Built 1996 Load: 32.4 t ADT: 300
CH 6(FAS 686)
FairOver: I-70
3 MI E MARTINSVILLE, Clark, IL
Built 1969 Load: 32.7 t ADT: 300
TR 223
FairOver: I-70
1.2 MI E OF IL 49, Clark, IL
Built 1969 Load: 32.7 t ADT: 100
TR 48
FairOver: I-70
2 MI E IL 49, Clark, IL
Built 1970 Load: 32.7 t ADT: 75
CH 3(FAS 692)
FairOver: PARTRIDGE CREEK
1.5 MI N DARWIN, Clark, IL
Built 1909 Load: 34.0 t ADT: 100
US 40(FAS 1707)
FairOver: CROOKED CREEK
1 MI W. OF I-70, Clark, IL
Built 1951 Load: 34.7 t ADT: 4,300
US 40(FAS 1707)
FairOver: STREAM
NE EDGE CASEY, Clark, IL
Built 1955 Load: 35.3 t ADT: 3,400
OLD US 40(SBI 11)
FairOver: LITTLE CREEK
.9 MI E MARTINSVILLE, Clark, IL
Built 1986 Load: 35.3 t ADT: 500
OLD US 40
FairOver: N FORK EMBARRAS R
.37 MI W MARTINSVILL, Clark, IL
Built 1986 Load: 36.0 t ADT: 1,300
US 40(FAS 1707)
FairOver: STREAM
EAST OF CASEY, Clark, IL
Built 1955 Load: 36.0 t ADT: 2,750
ILL 49(FAP 832)
FairOver: I-70
CASEY, Clark, IL
Built 1969 Load: 36.3 t ADT: 3,250
TR 272 A
FairOver: I-70
2 MI E IL 1, Clark, IL
Built 1968 Load: 36.6 t ADT: 200
I-70 (EB)
FairOver: N FORK EMBARRASS R
MARTINSVILLE, Clark, IL
Built 1968 Load: 36.6 t ADT: 11,400
I-70 (WB)
FairOver: N FORK EMBARRASS R
MARTINSVILLE, Clark, IL
Built 1968 Load: 36.6 t ADT: 11,400
TR 206
FairOver: E MILL CREEK TRIB
2.5 MI W MARSHALL, Clark, IL
Built 1965 Load: 36.6 t ADT: 20
US 40(FAS 1707)
FairOver: HAWKS CREEK
0.5 MI E. OF I-70, Clark, IL
Built 1951 Load: 38.2 t ADT: 2,150
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.