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)

FAS 1600 (CH 7)

Fair

Over: ROCK CREEK

1.4 MI S URSA, Adams, IL

Built 1984 Load: 40.8 t ADT: 650

TR 0276

Fair

Over: BRUSHY CRK

3.3 MI NW COATSBURG, Adams, IL

Built 1900 Load: 41.1 t ADT: 50

IL 96

Fair

Over: URSA CREEK

IN URSA .5M S IL 61, Adams, IL

Built 1924 Load: 41.5 t ADT: 4,300

US 24 (3RD ST)

Fair

Over: CEDAR CREEK & BN RR

1.5M N IL104/BROADWY, Adams, IL

Built 1968 Load: 41.5 t ADT: 5,300

IL 96

Fair

Over: BEAR CREEK

1.4M N MARCELLINE, Adams, IL

Built 1979 Load: 41.5 t ADT: 2,350

ILL 104 WB

Fair

Over: MILL CREEK

2.2MI E I-172/IL 104, Adams, IL

Built 1928 Load: 42.4 t ADT: 6,150

ILL 104 EB

Fair

Over: MILL CREEK

2.2MI E I-172/IL 104, Adams, IL

Built 1987 Load: 42.4 t ADT: 6,150

FAP 502/IL 57/3RD

Fair

Over: PAYSON ST

.5M S US 24/MAINE ST, Adams, IL

Built 1959 Load: 44.7 t ADT: 7,300

TR 579

Fair

Over: PIGEON CK

1.75 MI W PLAINVILLE, Adams, IL

Built 1977 Load: 44.7 t ADT: 125

TR-484

Fair

Over: Branch of McKee Crk

7 MI E LIBERTY, Adams, IL

Built 2005 Load: 45.7 t ADT: 75

ILL 96

Fair

Over: CURTIS CREEK

2.1 MI S ILL 104/96, Adams, IL

Built 2003 Load: 46.0 t ADT: 10,500

FAS 2599

Fair

Over: FALL CREEK

.4M E I-172, Adams, IL

Built 1982 Load: 47.6 t ADT: 1,100

TOWNSHIP ROAD 76

Fair

Over: MILL CREEK

3 SE OF QUINCY, Adams, IL

Built 1982 Load: 47.6 t ADT: 400

ILL 336 NB

Fair

Over: ROCK CREEK

2MI N I172/24 INT, Adams, IL

Built 1994 Load: 48.0 t ADT: 5,800

IL 57 (GARDNER EXP

Fair

Over: CURTIS CREEK

1.6M S US 24(MAINE), Adams, IL

Built 1959 Load: 49.6 t ADT: 5,150

US 24

Fair

Over: ROCK CREEK

0.2MI W I-172/US 24, Adams, IL

Built 1971 Load: 53.5 t ADT: 4,350

IL 96

Fair

Over: FRAZIER CREEK

.9M N US 24, Adams, IL

Built 1971 Load: 59.6 t ADT: 4,300

ILL 96

Fair

Over: HOMAN CREEK

3.4MI N JCT IL104/96, Adams, IL

Built 1928 Load: 70.6 t ADT: 3,250

FAI 172

Fair

Over: AUSTIN CREEK

3.0MI N I-172/IL 57, Adams, IL

Built 1982 Load: 89.1 t ADT: 9,750

FAI 172

Fair

Over: BRANCH OF MILL CREEK

1.2MI N I172/IL96, Adams, IL

Built 1975 Load: 89.1 t ADT: 7,400

I-172

Fair

Over: Dry Branch

0.70 mi S US 24, Adams, IL

Built 1975 Load: 89.1 t ADT: 7,350

TR 205

Good

Over: Frazier Creek

3.0 MILES S. OF URSA, Adams, IL

Built 1969 Load: 22.7 t ADT: 300

TR 269

Good

Over: HOLMAN CR

2 MI N QUINCY, Adams, IL

Built 1963 Load: 24.3 t ADT: 775

TR248

Good

Over: MUD CRK

1.0 N LORIANE, Adams, IL

Built 1983 Load: 24.3 t ADT: 75

SOUTH 8TH STREET

Good

Over: CURTIS CREEK

QUINCY, Adams, IL

Built 1899 Load: 24.3 t ADT: 3,000

TR-287

Good

Over: FIGLEY CRK

2.6 MI NE COLUMBUS, Adams, IL

Built 1902 Load: 24.9 t ADT: 50

CH 14

Good

Over: MCKEE CREEK

1.0 SW SILOAM SPRING, Adams, IL

Built 1964 Load: 25.9 t ADT: 150

TR 531A

Good

Over: FAI 172

3.6MI N I172/IL57, Adams, IL

Built 1981 Load: 29.8 t ADT: 125

US 24

Good

Over: FRAZIER CREEK

1.2 MI E JCT24+96, Adams, IL

Built 2001 Load: 32.4 t ADT: 3,950

CH 7

Good

Over: URSA CREEK

4.0 MI W URSA, Adams, IL

Built 1967 Load: 32.4 t ADT: 650

CH 7

Good

Over: DRAINAGE DITCH

1.2 MI W URSA ON CH, Adams, IL

Built 1969 Load: 32.4 t ADT: 500

TR 0135

Good

Over: BEAR CREEK

3.1 MI N CAMP POINT, Adams, IL

Built 1977 Load: 32.4 t ADT: 100

TR 0019

Good

Over: WILLIAMS BRANCH

2.0 MI N LAPRAIRIE, Adams, IL

Built 1978 Load: 32.4 t ADT: 50

TR 228

Good

Over: MUD CREEK

1.3 MI N LORAINE, Adams, IL

Built 1980 Load: 32.4 t ADT: 100

TR 194

Good

Over: MUD CREEK

2.5 MI NW LORAINE, Adams, IL

Built 1980 Load: 32.4 t ADT: 75

TR 309

Good

Over: MCKEE CREEK

1 MI E COLUMBUS, Adams, IL

Built 1981 Load: 32.4 t ADT: 125

TR 20

Good

Over: ROCKY RUN DIVERSION

2.6 MI NW MARCELINE, Adams, IL

Built 1984 Load: 32.4 t ADT: 100

TR 354

Good

Over: MC KEE CREEK

3.7 MI N LIBERTY, Adams, IL

Built 1985 Load: 32.4 t ADT: 75

CH 12

Good

Over: CROOKED NECK CREEK

1.6 MI SO BIG NECK, Adams, IL

Built 1987 Load: 32.4 t ADT: 200

CH 10

Good

Over: BR. MC CRANEY CR.

4 MI. E PLAINVILLE, Adams, IL

Built 1989 Load: 32.4 t ADT: 150

CH 14

Good

Over: MISSOURI CREEK

2.7 MI N CLAYTON, Adams, IL

Built 1992 Load: 32.4 t ADT: 500

CH 1

Good

Over: BEAR CR OVERFLOW

3.8 MI W LORAINE, Adams, IL

Built 2000 Load: 32.4 t ADT: 100

30TH STREET

Good

Over: CEDAR CREEK

0.5 MI N E QUINCY, Adams, IL

Built 2001 Load: 32.4 t ADT: 1,050

CH 3

Good

Over: MILL CREEK

2.0 MI S FOWLER, Adams, IL

Built 2000 Load: 32.4 t ADT: 425

CH 14

Good

Over: WALNUT FORK CR

2.5 M S CLAYTON, Adams, IL

Built 2004 Load: 32.4 t ADT: 425

FAS 1598 (CH 27)

Good

Over: BNSF RAILROAD

0.41 mi S FAS 2596, Adams, IL

Built 2014 Load: 32.4 t ADT: 1,100

FAS 1600 (CH 7)

Good

Over: Frazier Creek

2.5 mi SW Ursa, Adams, IL

Built 2013 Load: 32.4 t ADT: 625

CH 22

Good

Over: Pigeon Creek

1.5 MI E of PAYSON, Adams, IL

Built 1954 Load: 32.4 t ADT: 575

FAS-2599

Good

Over: Possum Hollow Creek

Near Pike Co Line, Adams, IL

Built 2018 Load: 32.4 t ADT: 450

TR 380

Good

Over: MCKEE CREEK

1.0 MI E COLUMBUS, Adams, IL

Built 1986 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.