County profile · official public datasets

Moultrie County, IL

172 public highway bridges tracked in the FHWA National Bridge Inventory: 39% rated Good, 51.2% Fair, 9.9% Poor.

172
Public bridges: 39%
Good condition: 9.9%
Poor condition

The verdict

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

Moultrie County pairs a higher-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

70th
of 102 on Poor share: 9.9%
Poor-condition share: 172
public highway bridges: 1984
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.

Moultrie County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Moultrie County ranks #70 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 9.9%). Moultrie County, Illinois contains 172 public highway bridges. Roughly 39% are rated “Good,” 51.2% “Fair,” and 9.9% “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

172

Public highway bridges in Moultrie County

Good condition

39%

67 of 172 rated 7-9

Fair condition

51.2%

88 of 172 rated 5-6

Poor condition

9.9%

17 of 172 rated 4 or below

In-state Poor-share rank

#70 of 102

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

Condition distribution

Share of 172 NBI-tracked bridges by lowest applicable component rating.

Good

39% (67)

Fair

51.2% (88)

Poor

9.9% (17)

Moultrie County's Poor-condition bridges carry 6,025 vehicle crossings a day

That is 4.6% of the county's reported daily bridge traffic on 9.9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 354 crossings a day against 651 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 172 of 172 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

29.7% of Moultrie County's bridges have passed the 50-year mark

51 of the 172 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 39% 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 78% of the county's Poor-condition bridge traffic

IL 121 (FAP 320) over WEST OKAW RIVER, built 1966, carries 4,700 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 17-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 6,025 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

1
1910s

1
1920s

1
1930s

2
1940s

1
1950s

15
1960s

22
1970s

16
1980s

39
1990s

38
2000s

17
2010s

16
2020s

3

What this shows Construction peaked in the 1980s, when 39 of the county's bridges still in the inventory were built, which is 22.7% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year is 1984, 5 years newer than the Illinois average of 1979.

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

The 5 Illinois counties nearest Moultrie County in number of bridges, with their condition splits. Its 9.9% Poor share is the 4th-lowest of these 6. Its average build year of 1984 against a peer-group mean of 1982 is in line with the group.

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

Bridge inventory size and condition shares for Moultrie County and the 5 Illinois counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Jasper County	181	70.7%	24.3%	5%	1982
Carroll County	179	37.4%	52%	10.6%	1979
Moultrie County (this page)	172	39%	51.2%	9.9%	1984
Cumberland County	169	54.4%	39.1%	6.5%	1979
Clay County	166	49.4%	37.3%	13.3%	1982
Hamilton County	165	80%	17.6%	2.4%	1989

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

Similar inventory size

Nearest county inventories outside IL (172 bridges here).

Colbert County, AL · 172 bridges
Marshall County, AL · 172 bridges
Newton County, IN · 172 bridges
Pike County, IN · 172 bridges

Similar average build year

Nearest mean year-built outside IL (1984 here).

Hennepin County, MN · avg 1984 · 936 bridges
Duval County, FL · avg 1984 · 831 bridges
El Paso County, CO · avg 1984 · 686 bridges
Bell County, TX · avg 1984 · 660 bridges

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

All 172 Good 67 Fair 88 Poor 17

All bridges (172)

Sort:

Moultrie County Bridge Snapshot

Condition distribution

Moultrie County's Poor-condition bridges carry 6,025 vehicle crossings a day

29.7% of Moultrie County's bridges have passed the 50-year mark

One structure carries 78% of the county's Poor-condition bridge traffic

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

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

All bridges (172)

TR 25

TR 10

TR 4 A

TR 57

TR 99

TR 42

TR 99 A

TR 142 A

PROGRESS ST(MS 260

FAS 642 (CH 4)

SBI 132 (OLD IL-12

TR 172

IL 133 (FAP 749)

FAS 1664

FAS 659(CH 8)

IL 121(FAP 320)

FAS 659(CH 8)

FAP 758(IL 32)

TR 131

FAP 770(IL 128)

ILL 133(FAP 749)

FAS 659(CADWELL RD

FAS 659(CH 8)

TR 167

TR 11

IL 32 (FAP 762)

FAS 642(CH 4)

ILL 128(FAP 770)

CITY ST(MS 2100)

IL 121 (FAP 320)

IL 121 (FAP 320)

FAS 642(CH 4)

US 36(FAP 323)

ILL 128(FAP 770)

FAP 320(IL 121)

IL 32 (FAP 758)

IL 121(FAP 320)

ILL 121(FAP 320)

TR 168

TR 118 D

TR 170

TR 20

FAP 320(IL 121)

IL 128 (FAP 770)

IL 128 (FAP 770)

IL 128 (FAP 770)

FAS 641(CH 3)

FAS 554

CH 9

FAS 554 (CH 9)

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