County profile · official public datasets

Randolph County, IL

149 public highway bridges tracked in the FHWA National Bridge Inventory: 59.7% rated Good, 32.9% Fair, 7.4% Poor.

149
Public bridges: 59.7%
Good condition: 7.4%
Poor condition

The verdict

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

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

Top 49%
lowest Poor share in state: 7.4%
Poor-condition share: 149
public highway bridges: 1981
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.

Randolph County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Randolph County ranks #50 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 7.4%). Randolph County, Illinois contains 149 public highway bridges. Roughly 59.7% are rated “Good,” 32.9% “Fair,” and 7.4% “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.

Total bridges

149

Public highway bridges in Randolph County

Good condition

59.7%

89 of 149 rated 7-9

Fair condition

32.9%

49 of 149 rated 5-6

Poor condition

7.4%

11 of 149 rated 4 or below

In-state Poor-share rank

#50 of 102

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

Condition distribution

Share of 149 NBI-tracked bridges by lowest applicable component rating.

Good

59.7% (89)

Fair

32.9% (49)

Poor

7.4% (11)

Randolph County's Poor-condition bridges carry 23,025 vehicle crossings a day

That is 15.4% of the county's reported daily bridge traffic on 7.4% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 2,093 crossings a day against 965 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 149 of 149 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

25.5% of Randolph County's bridges have passed the 50-year mark

38 of the 149 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 59.7% 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 27.1% of the county's Poor-condition bridge traffic

ILL 150 over MISS RIV/FAU 9416, built 1942, carries 6,250 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 23,025 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

pre-1900

1
1900s

5
1910s

1
1920s

3
1930s

6
1940s

2
1950s

4
1960s

10
1970s

15
1980s

36
1990s

35
2000s

21
2010s

8
2020s

2

What this shows Construction peaked in the 1980s, when 36 of the county's bridges still in the inventory were built, which is 24.2% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1981) matches the Illinois average (1979).

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

The 5 Illinois counties nearest Randolph County in number of bridges, with their condition splits. Its 7.4% Poor share is the 3rd-lowest of these 6. Its average build year of 1981 against a peer-group mean of 1980 is in line with the group.

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

Bridge inventory size and condition shares for Randolph County and the 5 Illinois counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Bond County	162	45.7%	46.3%	8%	1971
Greene County	162	51.9%	42.6%	5.6%	1981
Marshall County	155	42.6%	44.5%	12.9%	1984
Richland County	151	68.2%	26.5%	5.3%	1979
Randolph County (this page)	149	59.7%	32.9%	7.4%	1981
Henderson County	142	33.1%	54.9%	12%	1985

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

Similar inventory size

Nearest county inventories outside IL (149 bridges here).

Tallapoosa County, AL · 149 bridges
Drew County, AR · 149 bridges
Madison County, AR · 149 bridges
Walker County, GA · 149 bridges

Similar average build year

Nearest mean year-built outside IL (1981 here).

Franklin County, OH · avg 1981 · 922 bridges
Greenville County, SC · avg 1981 · 635 bridges
Montgomery County, OH · avg 1981 · 632 bridges
Shawnee County, KS · avg 1981 · 563 bridges

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

All 149 Good 89 Fair 49 Poor 11

All bridges (149)

Sort:

Randolph County Bridge Snapshot

Condition distribution

Randolph County's Poor-condition bridges carry 23,025 vehicle crossings a day

25.5% of Randolph County's bridges have passed the 50-year mark

One structure carries 27.1% of the county's Poor-condition bridge traffic

How Randolph 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 (149)

TR 224

FAS 862

TR 223

TR 208 A

LOCUST ST./ MSS 61

ILL 4 & 150

ILL 154

FAS 863

ILL 159

ILL 3

TR 108

FAS 849

TR 94

FAS 1870

CH 10

TR 183

TR 45

TR 118

TR 155

TR 124A

TR 176

TR 105

TR 118

TR 148

TR 138

TR 329

TR 205

TR 196A

TR 207

TR 327

RICHELAMAN RD

TR 311

TR 52 SCHERLE LN

TR-10 (Buzz Rk Rd)

TR 68

FAS 858 (ROOTS RD)

FAS 858

ILL 3

TR 232

FAS 849

ILL 154

FAS 863

FAS 853

TR 10

IL 155

Roots Rd

FAS 861

FAS 849A - CH 1

ILL 4-150

FAS 853

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