County profile · official public datasets

Piatt County, IL

246 public highway bridges tracked in the FHWA National Bridge Inventory: 62.2% rated Good, 31.7% Fair, 6.1% Poor.

246
Public bridges
62.2%
Good condition
6.1%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Piatt County posts a better-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

Top 26%
lowest Poor share in state
6.1%
Poor-condition share
246
public highway bridges
1979
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.

Piatt County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Piatt County ranks #27 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 6.1%). Piatt County, Illinois contains 246 public highway bridges. Roughly 62.2% are rated “Good,” 31.7% “Fair,” and 6.1% “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.

Total bridges

246

Public highway bridges in Piatt County

Good condition

62.2%

153 of 246 rated 7-9

Fair condition

31.7%

78 of 246 rated 5-6

Poor condition

6.1%

15 of 246 rated 4 or below

In-state Poor-share rank

#27 of 102

Among Illinois counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 246 NBI-tracked bridges by lowest applicable component rating.

Good
62.2% (153)
Fair
31.7% (78)
Poor
6.1% (15)

Piatt County's Poor-condition bridges carry 16,750 vehicle crossings a day

That is 6.3% of the county's reported daily bridge traffic on 6.1% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 1,117 crossings a day against 521 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 246 of 246 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

33.7% of Piatt County's bridges have passed the 50-year mark

83 of the 246 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 62.2% 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 32.5% of the county's Poor-condition bridge traffic

I-72 (EB) over Norfolk Southern Railway, built 1975, carries 5,450 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 15-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 16,750 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Piatt County's bridges were built

246 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1970s, when 60 of the county's bridges still in the inventory were built, which is 24.4% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1979) matches the Illinois average (1979).

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Piatt County compares with Illinois's closest counties by inventory size

The 5 Illinois counties nearest Piatt County in number of bridges, with their condition splits. Its 6.1% Poor share is the 3rd-lowest of these 6. Its average build year of 1979 against a peer-group mean of 1974 is 5 years newer.

Showing the 5 closest of 101 Illinois counties eligible for comparison.

Bridge inventory size and condition shares for Piatt County and the 5 Illinois counties closest to it in inventory size
County Bridges Poor
Effingham County 253 4.7%
Lake County 251 10%
Piatt County (this page) 246 6.1%
Macoupin County 242 17.8%
Morgan County 234 8.5%
Washington County 233 6%

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 Piatt 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 Piatt County, both outside Illinois so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside IL (246 bridges here).

Similar average build year

Nearest mean year-built outside IL (1979 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 246 Good 153 Fair 78 Poor 15

Good-condition bridges (153)

TR 215

Good

Over: STREAM

1.0 MI W OF HAMMOND, Piatt, IL

Built 1973 Load: 22.4 t ADT: 50

TR 161

Good

Over: DRAINAGE DITCH

2.5 MI SE BEMENT, Piatt, IL

Built 1960 Load: 22.7 t ADT: 50

TR 169

Good

Over: STREAM

2 MI SSE CERRO GORDO, Piatt, IL

Built 1971 Load: 23.3 t ADT: 50

TR 1

Good

Over: DRAINAGE DITCH

5.5 MI NW MANSFIELD, Piatt, IL

Built 1969 Load: 23.7 t ADT: 75

TR 129

Good

Over: KANKAKEE DRAIN DITCH

1.0 MI N IVESDALE, Piatt, IL

Built 1974 Load: 24.3 t ADT: 25

TR 14

Good

Over: STREAM

1 MI NE LA PLACE, Piatt, IL

Built 1968 Load: 24.3 t ADT: 75

TR 203

Good

Over: STREAM

1.0 MI NE LA PLACE, Piatt, IL

Built 1963 Load: 24.6 t ADT: 50

TR 40 A

Good

Over: I-72

2 MI W MONTICELLO, Piatt, IL

Built 1975 Load: 25.3 t ADT: 75

CH 10

Good

Over: STREAM

2.5 MI N OF I-74, Piatt, IL

Built 1900 Load: 25.3 t ADT: 150

FAP 758(IL 32)

Good

Over: STREAM

.6 MI N OF US 36, Piatt, IL

Built 1995 Load: 25.6 t ADT: 1,450

TR 46

Good

Over: STREAM

0.5 MI S BURROWSVLLE, Piatt, IL

Built 1957 Load: 25.6 t ADT: 25

TR 16

Good

Over: WOLF RUN

2.5 MI NE OF CISCO, Piatt, IL

Built 1971 Load: 25.9 t ADT: 75

TR 35

Good

Over: MADDEN CREEK

3.0 MI SE MANSFIELD, Piatt, IL

Built 1978 Load: 25.9 t ADT: 250

TR 103

Good

Over: WOLF RUN CREEK

2 MI NE OF CISCO, Piatt, IL

Built 1969 Load: 26.2 t ADT: 25

TR 16

Good

Over: STREAM

3 MI NE CISCO, Piatt, IL

Built 1971 Load: 26.6 t ADT: 75

TR 16

Good

Over: I-72

2 MI E OF CISCO, Piatt, IL

Built 1975 Load: 27.2 t ADT: 75

TR 133

Good

Over: WILLOW BRANCH

3.0 MI NW OF MILMINE, Piatt, IL

Built 1974 Load: 27.9 t ADT: 200

TR 91

Good

Over: CAMP CREEK

2 M SE WHITE HEATH, Piatt, IL

Built 1959 Load: 29.5 t ADT: 50

TR 126

Good

Over: TRIB LAKE FORK

3.0 MI NW ATWOOD, Piatt, IL

Built 1957 Load: 29.8 t ADT: 25

TR 28

Good

Over: WILLOW BRANCH

2 MI S ALLERTON PK, Piatt, IL

Built 1962 Load: 30.8 t ADT: 50

CH 7(FAS 529)

Good

Over: LAKE FORK DRAIN DIT

3.1 MI E OF BEMENT, Piatt, IL

Built 1937 Load: 31.4 t ADT: 800

FAS 530 (TR 2)

Good

Over: STREAM

2.5 MI S IVESDALE, Piatt, IL

Built 1981 Load: 32.4 t ADT: 825

CH 16

Good

Over: LAKE FORK

.5 MI W OF ATWOOD, Piatt, IL

Built 1963 Load: 32.4 t ADT: 450

FAS 529(CH 7)

Good

Over: STREAM

0.2 MI E OF BEMENT, Piatt, IL

Built 1962 Load: 32.4 t ADT: 900

FAS 535(CH 2)

Good

Over: SANGAMON RIVER

5 MI N of Monticello, Piatt, IL

Built 2003 Load: 32.4 t ADT: 1,350

FAP 758(IL 32)

Good

Over: STREAM

1.2 MI N OF LA PLACE, Piatt, IL

Built 1996 Load: 32.4 t ADT: 1,450

FAP 760 (IL 32)

Good

Over: STREAM

1.8 MI N CERRO GORDO, Piatt, IL

Built 2000 Load: 32.4 t ADT: 1,250

FAS 1531

Good

Over: WILD CAT CREEK

5 MI E OF CISCO, Piatt, IL

Built 2011 Load: 32.4 t ADT: 1,650

FAS 1531

Good

Over: WOLF RUN CREEK

2 MI E OF CISCO, Piatt, IL

Built 2011 Load: 32.4 t ADT: 900

TR 13

Good

Over: MADDEN CREEK

1 MI N OF MANSFIELD, Piatt, IL

Built 1970 Load: 32.4 t ADT: 50

TR 92

Good

Over: STREAM

1.0 MI SW BEMENT, Piatt, IL

Built 1977 Load: 32.4 t ADT: 250

TR 113

Good

Over: STREAM

2.5 MI SE MONTICELLO, Piatt, IL

Built 1976 Load: 32.4 t ADT: 50

TR 172

Good

Over: STREAM

2.8 MI NNW ATWOOD, Piatt, IL

Built 1978 Load: 32.4 t ADT: 50

TR 64

Good

Over: GOOSE CREEK

2.2 MI W GALESVILLE, Piatt, IL

Built 1978 Load: 32.4 t ADT: 75

TR 157

Good

Over: STREAM

0.25 MI E MILMINE, Piatt, IL

Built 1978 Load: 32.4 t ADT: 50

TR 150

Good

Over: MADDEN CREEK

1.5 MI S MANSFIELD, Piatt, IL

Built 1979 Load: 32.4 t ADT: 50

TR 101

Good

Over: CAMP CREEK DRAIN DIT

4.5 MI E MONTICELLO, Piatt, IL

Built 1979 Load: 32.4 t ADT: 25

TR 185

Good

Over: STREAM

1 MI S OF VOORHIES, Piatt, IL

Built 1979 Load: 32.4 t ADT: 50

TR 161

Good

Over: LAKE FORK DRAIN DIT

3 MI ESE OF BEMENT, Piatt, IL

Built 1979 Load: 32.4 t ADT: 50

TR 126

Good

Over: DRAINAGE DITCH

4 MI SE OF BEMENT, Piatt, IL

Built 1985 Load: 32.4 t ADT: 25

TR 177

Good

Over: DRAINAGE DITCH

3.5 MI E VOORHIES, Piatt, IL

Built 1981 Load: 32.4 t ADT: 50

TR 164

Good

Over: STREAM

3.0 MI SE MANSFIELD, Piatt, IL

Built 1979 Load: 32.4 t ADT: 75

TR 5

Good

Over: S BRANCH SALT CREEK

4.0 MI NW MANSFIELD, Piatt, IL

Built 1980 Load: 32.4 t ADT: 75

TR 19

Good

Over: MADDEN CREEK

0.5 MI E MANSFIELD, Piatt, IL

Built 1981 Load: 32.4 t ADT: 50

TR 38

Good

Over: GOOSE CREEK

1.5 MI S DELAND, Piatt, IL

Built 1981 Load: 32.4 t ADT: 50

TR 105

Good

Over: WOLF RUN TRIB

3.3 MI E CISCO, Piatt, IL

Built 1981 Load: 32.4 t ADT: 150

TR 138

Good

Over: LAKE FORK DRAIN DIT

3 MI SE BEMENT, Piatt, IL

Built 1981 Load: 32.4 t ADT: 50

TR 167

Good

Over: DRAINAGE DITCH

5.0 MI SE BEMENT, Piatt, IL

Built 1983 Load: 32.4 t ADT: 75

TR 92

Good

Over: DRAINAGE DITCH

2.5 MI SE BEMENT, Piatt, IL

Built 1981 Load: 32.4 t ADT: 75

TR 185

Good

Over: DRAINAGE DITCH

4.0 MI S MILMINE, Piatt, IL

Built 1980 Load: 32.4 t ADT: 50

Read our methodology - how this data is sourced, computed, and verified.

Related

Browse all → | Rankings →
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.