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.

When Randolph County's bridges were built

149 bridges with a recorded construction year, grouped by decade

bridges

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).

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

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 Poor
Bond County 162 8%
Greene County 162 5.6%
Marshall County 155 12.9%
Richland County 151 5.3%
Randolph County (this page) 149 7.4%
Henderson County 142 12%

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).

Similar average build year

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

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)

IL RTE 3

Good

Over: TRIB TO HORSE CREEK

0.14M NORTH OF RUMA, Randolph, IL

Built 1994 Load: 32.4 t ADT: 4,650

BLUFF RD/MODOC RD

Good

Over: CREEK

0.9MI W MODOC, Randolph, IL

Built 1996 Load: 32.4 t ADT: 400

IL 4

Good

Over: S Trib to Maxwell Cr

0.5 MI S SPARTA, Randolph, IL

Built 1996 Load: 32.4 t ADT: 3,000

UNMARKED PARK RD

Good

Over: TRIB. TO PLUM CREEK

WORLD SHOOTING COMPL, Randolph, IL

Built 2003 Load: 32.4 t ADT: 100

IL 153

Good

Over: TRIB TO MUD CREEK

300 S WASH CO LINE, Randolph, IL

Built 1934 Load: 32.4 t ADT: 1,350

FAS 849 CH 1

Good

Over: GRAVEL CREEK

CH1 OVER GRAVEL CR., Randolph, IL

Built 1973 Load: 32.4 t ADT: 2,150

FAS 849 CH 1

Good

Over: TINDALL CREEK

CH1 OVER TINDALL CK, Randolph, IL

Built 1972 Load: 32.4 t ADT: 2,050

FAS 1870 CH 2

Good

Over: FRICKLES BRANCH

.5 MI W. OF WELGE, Randolph, IL

Built 2010 Load: 32.4 t ADT: 725

FAS 863/CH 19

Good

Over: COX CREEK

SOUTH STEELEVILLE, Randolph, IL

Built 2006 Load: 32.4 t ADT: 2,150

FAS 863 (CH19)

Good

Over: COX DRAINAGE DITCH

.5MI S OF STEELVILLE, Randolph, IL

Built 2009 Load: 32.4 t ADT: 2,150

CH 22

Good

Over: TRIB TO COX CREEK

2 MILES S OF PERCY, Randolph, IL

Built 2004 Load: 32.4 t ADT: 650

TR 100 PRESTON RD

Good

Over: TRIB TO KASKASKIA RV

SW OF BALDWIN, Randolph, IL

Built 1999 Load: 32.4 t ADT: 100

TR 224

Good

Over: PLUM CREEK

TR 224 OVER PLUM CRK, Randolph, IL

Built 1978 Load: 32.4 t ADT: 250

TR 264

Good

Over: LICK BRANCH

T5S R5W, Randolph, IL

Built 1981 Load: 32.4 t ADT: 25

TR 236

Good

Over: TRIB OF PLUM CR

2.5 MI NE OF SPARTA, Randolph, IL

Built 1980 Load: 32.4 t ADT: 300

TR 236

Good

Over: PLUM CR

2.5 MI NE SPARTA, Randolph, IL

Built 1980 Load: 32.4 t ADT: 100

TR 92

Good

Over: NINE MILE CREEK

2.0 NE ELLIS GROVE, Randolph, IL

Built 1990 Load: 32.4 t ADT: 50

TR 67

Good

Over: TRIB TO PLUM CREEK

2 MI W. HOUSTON, Randolph, IL

Built 1992 Load: 32.4 t ADT: 25

TR 187

Good

Over: LITTLE MARYS RIVER

3 MILES SOUTH SPARTA, Randolph, IL

Built 1994 Load: 32.4 t ADT: 75

TR 21

Good

Over: TRIB. TO PLUM CRK

NORTH OF SPARTA, Randolph, IL

Built 1997 Load: 32.4 t ADT: 25

TR-159A

Good

Over: Marys River

4 MILES SE OF SPARTA, Randolph, IL

Built 2003 Load: 32.4 t ADT: 50

TR 109

Good

Over: MARYS RIVER

TR 109 OVER MARYS RV, Randolph, IL

Built 1978 Load: 32.4 t ADT: 100

TR 87

Good

Over: MARYS RIVER

S. OF COULTERVILLE, Randolph, IL

Built 1998 Load: 32.4 t ADT: 150

TR 33-KELLY ROAD

Good

Over: TRIB TO PLUM CREEK

3MI N OF SPARTA, Randolph, IL

Built 2007 Load: 32.4 t ADT: 50

TR 232

Good

Over: TRIB ROCKCASTLE CK

2MI S/W STEELEVILLE, Randolph, IL

Built 2009 Load: 32.4 t ADT: 225

TR 160

Good

Over: WELGE CREEK

1.25 MI SW OF BLAIR, Randolph, IL

Built 2003 Load: 32.4 t ADT: 25

TR 311

Good

Over: TRIB TO MARYS RIVER

1 MI E OF CHESTER, Randolph, IL

Built 1976 Load: 32.4 t ADT: 550

TR 90

Good

Over: Trib to Nine Mile Cr

1 Mile E Ellis Grove, Randolph, IL

Built 2013 Load: 32.4 t ADT: 100

TR-226A EBENEZER R

Good

Over: ROCK CREEK

.25 MI NE ROCKWOOD, Randolph, IL

Built 2002 Load: 32.4 t ADT: 50

TR 231

Good

Over: MARYS RIVER

TR231 .75MW STEEVLLE, Randolph, IL

Built 1981 Load: 32.4 t ADT: 225

TR 144

Good

Over: Trib to Welge Creek

5 Mi S of Schuline, Randolph, IL

Built 2014 Load: 32.4 t ADT: 275

TR 262

Good

Over: TRIB TO COX CREEK

1.5 M SE STEELEVILLE, Randolph, IL

Built 1981 Load: 32.4 t ADT: 50

TR 194

Good

Over: MILL CREEK

TR194 OVERMILL CRK, Randolph, IL

Built 1983 Load: 32.4 t ADT: 225

TR 327

Good

Over: PATTEN BRANCH

1.5 MI E OF CHESTER, Randolph, IL

Built 1982 Load: 32.4 t ADT: 200

TR 122A

Good

Over: GRAVEL CREEK

TR122A OVR GRAVEL CR, Randolph, IL

Built 1983 Load: 32.4 t ADT: 150

TR 110

Good

Over: NINEMILE CR

SELZ 3M NE ELLIS GR, Randolph, IL

Built 1983 Load: 32.4 t ADT: 50

TR 225

Good

Over: NINE MILE CREEK

1M N OF N PALESTINE, Randolph, IL

Built 1984 Load: 32.4 t ADT: 50

TR 257

Good

Over: TRIB TO RILEY CREEK

2 MI S ELISGROVE, Randolph, IL

Built 1984 Load: 32.4 t ADT: 50

TR 140

Good

Over: TRIB TO LITTLE MARYS

6 M W STEELVILLE, Randolph, IL

Built 1984 Load: 32.4 t ADT: 25

TR 243

Good

Over: ROBINSON CREE

3 MI EAST ELLISGROVE, Randolph, IL

Built 1985 Load: 32.4 t ADT: 50

TR 92

Good

Over: LITTLE NINE MILE CK

SEC 8 1M N ELLIS GRO, Randolph, IL

Built 1990 Load: 32.4 t ADT: 50

TR 276

Good

Over: N FORK COX CREEK

1.5 M NE STEELVILLE, Randolph, IL

Built 1986 Load: 32.4 t ADT: 100

TR122

Good

Over: TINDALL CREEK

2 MILES NE CHESTR, Randolph, IL

Built 1989 Load: 32.4 t ADT: 175

TR 122

Good

Over: MORRISON BRANCH

1 3/4 MI. NE CHESTER, Randolph, IL

Built 1989 Load: 32.4 t ADT: 175

TR 108

Good

Over: TRIB TO GRAVEL CK

1 1/2 MI N CHESTER, Randolph, IL

Built 1991 Load: 32.4 t ADT: 175

TR 210

Good

Over: DRY CREEK

1.5NW LEANDERVILLE, Randolph, IL

Built 1994 Load: 32.4 t ADT: 25

TR 198

Good

Over: TRIBUTARY TO MARYS R

2.25 N ROCKWOOD, Randolph, IL

Built 1978 Load: 32.4 t ADT: 50

TR-256 (Piney Cr R

Good

Over: Piney Branch Cr

2 MI SW OF SHILOH, Randolph, IL

Built 2002 Load: 32.4 t ADT: 25

TR 137

Good

Over: CAMPS CREEK

MARIGOLD ROAD, Randolph, IL

Built 1997 Load: 32.4 t ADT: 75

TR 203

Good

Over: Trib to Kaskaskia

3 M NW Ellis Grove, Randolph, IL

Built 2013 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.