County profile · official public datasets

Adams County, IL

319 public highway bridges tracked in the FHWA National Bridge Inventory: 40.4% rated Good, 53.6% Fair, 6% Poor.

319
Public bridges
40.4%
Good condition
6%
Poor condition

The verdict

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

Adams County posts a top-quartile lowest Poor-condition share among rated counties in the state across mid-size county bridge inventory.

Top 24%
lowest Poor share in state
6%
Poor-condition share
319
public highway bridges
1976
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.

Adams County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Adams County ranks #24 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 6%). Adams County, Illinois contains 319 public highway bridges. Roughly 40.4% are rated “Good,” 53.6% “Fair,” and 6% “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

319

Public highway bridges in Adams County

Good condition

40.4%

129 of 319 rated 7-9

Fair condition

53.6%

171 of 319 rated 5-6

Poor condition

6%

19 of 319 rated 4 or below

In-state Poor-share rank

#24 of 102

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

Condition distribution

Share of 319 NBI-tracked bridges by lowest applicable component rating.

Good
40.4% (129)
Fair
53.6% (171)
Poor
6% (19)

Adams County's Poor-condition bridges carry 28,035 vehicle crossings a day

That is 7.3% of the county's reported daily bridge traffic on 6% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 1,476 crossings a day against 1,139 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 319 of 319 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

27.9% of Adams County's bridges have passed the 50-year mark

89 of the 319 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 40.4% 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 26.8% of the county's Poor-condition bridge traffic

HARRISON STREET over CURTIS CREEK, built 1967, carries 7,500 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 19-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 28,035 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Adams County's bridges were built

319 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1980s, when 86 of the county's bridges still in the inventory were built, which is 27% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1976) matches the Illinois average (1979).

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

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

The 5 Illinois counties nearest Adams County in number of bridges, with their condition splits. Its 6% Poor share is the 2nd-lowest of these 6. Its average build year of 1976 against a peer-group mean of 1978 is in line with the group.

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

Bridge inventory size and condition shares for Adams County and the 5 Illinois counties closest to it in inventory size
County Bridges Poor
Pike County 330 10%
Henry County 328 11%
Christian County 321 16.8%
Adams County (this page) 319 6%
Franklin County 310 2.6%
Coles County 304 8.9%

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

Similar inventory size

Nearest county inventories outside IL (319 bridges here).

Similar average build year

Nearest mean year-built outside IL (1976 here).

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

All 319 Good 129 Fair 171 Poor 19

All bridges (319)

TR 117

Good

Over: BRUCHY CREEK

3.2 MI E MENDON, Adams, IL

Built 1989 Load: 32.4 t ADT: 50

TR 410

Good

Over: CREEK

3.1MI NE LIBERTY, Adams, IL

Built 1989 Load: 32.4 t ADT: 50

TR 301

Good

Over: INDIAN GRAVE DITCH

1.7MI N QUINCY, Adams, IL

Built 1991 Load: 32.4 t ADT: 300

TR 144

Good

Over: ROCK CREEK

2.6 MI S MENDON, Adams, IL

Built 1991 Load: 32.4 t ADT: 100

TR 278

Good

Over: THURMAN CREEK

1.5 MI E LORAINE, Adams, IL

Built 1991 Load: 32.4 t ADT: 50

TR 143

Good

Over: MISSOURI CREEK

3.0 MI N CLAYTON, Adams, IL

Built 1993 Load: 32.4 t ADT: 25

TR 597

Good

Over: FALL CREEK

.1 MI S OF FALL CRK, Adams, IL

Built 1996 Load: 32.4 t ADT: 75

TR 31

Good

Over: THURMAN CR

1.0 MI NE LORAINE, Adams, IL

Built 2005 Load: 32.4 t ADT: 100

TR 300

Good

Over: TOURMEAL CREEK

2.3MI E PLAINVILLE, Adams, IL

Built 1996 Load: 32.4 t ADT: 75

TR 767

Good

Over: CEDAR CREEK

1MI NE QUINCY, Adams, IL

Built 1997 Load: 32.4 t ADT: 3,350

TR 230

Good

Over: MILL CREEK

6 MI E QUINCY, Adams, IL

Built 1996 Load: 32.4 t ADT: 75

TR 354

Good

Over: BRANCH MC KEE CREEK

2.5 MI N LIBERTY, Adams, IL

Built 1999 Load: 32.4 t ADT: 100

TR 92

Good

Over: BEAR CREEK

2.9 MI SE LIMA, Adams, IL

Built 1997 Load: 32.4 t ADT: 50

TR 205

Good

Over: FRAZIER CREEK

3 MI S URSA, Adams, IL

Built 1997 Load: 32.4 t ADT: 300

TR 314

Good

Over: WOODVILLE BRANCH

3 MI NELORAINE, Adams, IL

Built 1997 Load: 32.4 t ADT: 75

TR 375

Good

Over: LITTLE MILL CREEK

2.6 MI E QUINCY, Adams, IL

Built 1999 Load: 32.4 t ADT: 500

TR 362

Good

Over: CBR MCKEE CREEK

1.5MI N COATSBURG, Adams, IL

Built 1997 Load: 32.4 t ADT: 75

TR 89 A

Good

Over: ELM CREEK

3 MI W GOLDEN, Adams, IL

Built 2000 Load: 32.4 t ADT: 275

TR 174

Good

Over: LITTLE CREEK

4.4 MI E LIMA, Adams, IL

Built 1998 Load: 32.4 t ADT: 75

TR 192

Good

Over: S FORK BEAR CR

2.5 MI W LORAINE, Adams, IL

Built 2001 Load: 32.4 t ADT: 75

TR 369

Good

Over: WALNUT CREEK

2 MI NW KELLERVLLE, Adams, IL

Built 2004 Load: 32.4 t ADT: 75

TR 354

Good

Over: BR LIERLE CR

1.5 M N LIBERTY, Adams, IL

Built 2005 Load: 32.4 t ADT: 300

TR 218

Good

Over: MILL CREEK

.75 MI S BURTON, Adams, IL

Built 2003 Load: 32.4 t ADT: 50

CH 35

Good

Over: Branch Mill Creek

1.4 mi S Fowler, Adams, IL

Built 2012 Load: 32.4 t ADT: 100

TR 3

Good

Over: WHITE OAK CR

1.5 NE LIMA, Adams, IL

Built 2005 Load: 32.4 t ADT: 100

TR 569

Good

Over: MCCRANEY CR

5 M E PLANEVILLE, Adams, IL

Built 2005 Load: 32.4 t ADT: 150

TR 20

Good

Over: BEAR CREEK

3 M N URSA, Adams, IL

Built 2007 Load: 32.4 t ADT: 175

TR 32

Good

Over: ALXNDR BRANCH

1 M S QUINCY, Adams, IL

Built 2005 Load: 32.4 t ADT: 700

TR 887

Good

Over: DITCH

1 M SW QUINCY, Adams, IL

Built 2006 Load: 32.4 t ADT: 1,300

TR 607A

Good

Over: HADLEY CR

2 M SW BEVERLY, Adams, IL

Built 2007 Load: 32.4 t ADT: 50

TR 205

Good

Over: BRANCH ROCK CREEK

4 M SW MENDON, Adams, IL

Built 2008 Load: 32.4 t ADT: 250

TR 377

Good

Over: LIERLE CR

3 M SE COLUMBUS, Adams, IL

Built 2007 Load: 32.4 t ADT: 50

TR 488A

Good

Over: BR OF WALNUT CR

1.25 M SW CLAYTON, Adams, IL

Built 2009 Load: 32.4 t ADT: 75

TR 39

Good

Over: BR THURMAN CR

5.2 M NE LORAINE, Adams, IL

Built 2009 Load: 32.4 t ADT: 50

TR 10

Good

Over: FRAZIER CREEK

3.6 M S URSA, Adams, IL

Built 2011 Load: 32.4 t ADT: 50

TR 549

Good

Over: HARKNESS CREEK

BLUFF HALL, Adams, IL

Built 2010 Load: 32.4 t ADT: 50

TR 116

Good

Over: Br. of Mill Creek

0.58 mi S TR 423A, Adams, IL

Built 2015 Load: 32.4 t ADT: 400

TR-265

Good

Over: Walnut Fork Crk

1.0 mi S FAP 317, Adams, IL

Built 2017 Load: 32.4 t ADT: 75

TR 349

Good

Over: Little Mill Creek

0.07 mi W TR 152, Adams, IL

Built 2016 Load: 32.4 t ADT: 1,500

TR-597

Good

Over: Austin Creek

0.35 mi W of I-172, Adams, IL

Built 2018 Load: 32.4 t ADT: 75

TR 0088

Good

Over: JENKINS CREEK

1.6 MI SE MARCELLINE, Adams, IL

Built 1978 Load: 32.4 t ADT: 100

TR 476

Good

Over: BR OF HADLEY CREEK

1.5 MI S EBEVERLY, Adams, IL

Built 1981 Load: 32.4 t ADT: 50

TR 93

Good

Over: GRINDSTONE CREEK

1.5 MI N MENDON, Adams, IL

Built 1982 Load: 32.4 t ADT: 75

TR 229

Good

Over: BR OF ROCK CREEK

4 M SE URSA, Adams, IL

Built 2011 Load: 32.4 t ADT: 125

TR 21

Good

Over: WHITE OAK CR

1 M WNW LIMA, Adams, IL

Built 2012 Load: 32.4 t ADT: 50

TR-351

Good

Over: Little Mill Creek

0.02 mi W TR 152, Adams, IL

Built 2015 Load: 32.4 t ADT: 250

SO 28TH ST

Good

Over: CURTIS CREEK

ON SO 28TH E OF MON, Adams, IL

Built 1972 Load: 32.4 t ADT: 1,100

MS 1000

Good

Over: CURTIS CREEK

1.25 MI SO QUINCY, Adams, IL

Built 1976 Load: 32.4 t ADT: 50

NORTH 5TH STREET

Good

Over: CEDAR CREEK

N 5TH AT CEDAR CRK, Adams, IL

Built 2011 Load: 32.4 t ADT: 700

PARK ROAD

Good

Over: FALL CREEK

ENT FALL CR REST ARE, Adams, IL

Built 1980 Load: 32.4 t ADT: 100

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

Related

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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.