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)

IL 57

Good

Over: AUSTIN CREEK

.9M N I-172, Adams, IL

Built 1995 Load: 32.7 t ADT: 4,000

MONROE STREET

Good

Over: EMERY CREEK

ON MONROE AT SO 26TH, Adams, IL

Built 1972 Load: 33.4 t ADT: 1,450

TR 114A

Good

Over: FAI 172

1MI S I172/IL96, Adams, IL

Built 1981 Load: 33.7 t ADT: 200

TR 597

Good

Over: FAI 172

.7MI S I172/IL57, Adams, IL

Built 1982 Load: 34.3 t ADT: 75

I-172 & ILL 336 SB

Good

Over: US 24

US 24 & IL 336 JCT, Adams, IL

Built 1994 Load: 34.7 t ADT: 3,675

I-172 & ILL 336 NB

Good

Over: US 24

US 24 & IL 336 JCT, Adams, IL

Built 1994 Load: 34.7 t ADT: 3,675

FAI 172 NB

Good

Over: MILL CREEK

.8MI S I172/IL96, Adams, IL

Built 1981 Load: 35.0 t ADT: 4,875

US 24

Good

Over: WALNUT FORK CREEK

.7MI E CLAYTON, Adams, IL

Built 1994 Load: 35.3 t ADT: 2,800

FAP 733

Good

Over: ILL 336

0.3 MI E MENDON, Adams, IL

Built 2001 Load: 36.0 t ADT: 2,150

IL 61

Good

Over: THURMAN CREEK

.2M E LORAINE RD, Adams, IL

Built 1996 Load: 36.3 t ADT: 750

CH 17

Good

Over: BEAR CREEK

2MI W OF GOLDEN CH17, Adams, IL

Built 1992 Load: 36.6 t ADT: 475

TR 276

Good

Over: BRUSHY CRK

1.6 MI NW COATSBURG, Adams, IL

Built 1983 Load: 36.9 t ADT: 50

FAI 172 SB

Good

Over: MILL CREEK

.8MI S I172/IL96, Adams, IL

Built 1981 Load: 37.3 t ADT: 4,875

FAI 172 SB

Good

Over: ILL 57

I-172/IL57 INT, Adams, IL

Built 1982 Load: 37.6 t ADT: 6,550

CH-4

Good

Over: Tourmeal Creek

3.5 SE BURTON, Adams, IL

Built 2002 Load: 37.6 t ADT: 575

CH 5

Good

Over: FAI 172

.7MI S I172/IL104, Adams, IL

Built 1976 Load: 37.9 t ADT: 3,550

TR 118

Good

Over: SAND BRANCH

2.75 MI S W MENDON, Adams, IL

Built 1979 Load: 37.9 t ADT: 125

CH 4

Good

Over: PIGEON CREEK

2.5 MI E PAYSON, Adams, IL

Built 2000 Load: 37.9 t ADT: 575

IL 96

Good

Over: Cedar Creek

1.6 mi. N IL 104, Adams, IL

Built 2017 Load: 38.6 t ADT: 6,200

FAS 1603 (CH 39)

Good

Over: Grindstone Creek

1.28 mi W of FAS 432B, Adams, IL

Built 2023 Load: 38.9 t ADT: 100

IL 57

Good

Over: GHOST HOLLOW CR

JUST N 12TH ST RD, Adams, IL

Built 1931 Load: 39.2 t ADT: 4,600

FAU 7810 (IL 96)

Good

Over: Emery Creek

.3 mi E 24th St Qcy., Adams, IL

Built 2016 Load: 39.9 t ADT: 11,300

IL 96

Good

Over: WHITE OAK CREEK

1.6M S CH 41 IN LIMA, Adams, IL

Built 1994 Load: 40.5 t ADT: 2,300

US 24

Good

Over: ROCK CREEK

1.2 MI W FOWLER, Adams, IL

Built 1994 Load: 40.5 t ADT: 4,000

FAS 591 CH-5

Good

Over: TOURNEAR CREEK

2 M SE BURTON, Adams, IL

Built 2009 Load: 40.5 t ADT: 400

ILL 96

Good

Over: PIGEON CREEK

2MI SE PAYSON, Adams, IL

Built 1992 Load: 41.1 t ADT: 900

FAS 2597 (CH 41)

Good

Over: BLUFF CANAL

2 MI W OF LIMA, Adams, IL

Built 1976 Load: 41.1 t ADT: 150

ILL 96

Good

Over: PIGEON CREEK

1.7MI SE PAYSON, Adams, IL

Built 1991 Load: 42.1 t ADT: 900

TR 122

Good

Over: CREEK

3.1 MI E MARCELLENE, Adams, IL

Built 1963 Load: 43.1 t ADT: 125

TR 419 (N 900th AV

Good

Over: BR of Tournear Creek

0.8 MI E FAS 594/CH4, Adams, IL

Built 2021 Load: 43.4 t ADT: 175

CH 7

Good

Over: BEAR CREEK

3.2 MI W MARCELLINE, Adams, IL

Built 1969 Load: 45.0 t ADT: 450

CH 48

Good

Over: WALNUT FORK

5.2 M NE LIBERTY, Adams, IL

Built 1959 Load: 45.7 t ADT: 750

IL 96

Good

Over: BRANCH BEAR CREEK

.4M S MARCELLINE, Adams, IL

Built 1994 Load: 46.0 t ADT: 2,600

FAS 432 (CH 14)

Good

Over: Br of South Fork Ck

3.4 MI SE LaPrairie, Adams, IL

Built 2021 Load: 47.3 t ADT: 275

ILL 336 SB

Good

Over: ROCK CREEK

2MI N I172/24 INT, Adams, IL

Built 1994 Load: 48.0 t ADT: 5,800

IL 57

Good

Over: DISTILLERY HOLLOW

.3M N 24TH ST RD, Adams, IL

Built 1993 Load: 48.3 t ADT: 4,000

IL 96

Good

Over: JENKINS CREEK

1.3M N IL 61 IN URSA, Adams, IL

Built 1994 Load: 48.6 t ADT: 3,450

IL 104

Good

Over: GRINDSTONE CR

2 M W BEVERLY RD, Adams, IL

Built 2011 Load: 48.9 t ADT: 775

TR 255

Good

Over: Frazier Creek

2.5 MI N of Quincy, Adams, IL

Built 2021 Load: 50.5 t ADT: 100

TR 366 (E 2200th S

Good

Over: Br. of McCraney Crk

1.3 mi S IL 104, Adams, IL

Built 2021 Load: 50.5 t ADT: 150

FAI 172

Good

Over: FALL CREEK

1.0 M S IL 57, Adams, IL

Built 1982 Load: 52.5 t ADT: 13,100

TR 302

Good

Over: Tributary to McKee Creek

1.0 mi S of Coatsburg, Adams, IL

Built 2022 Load: 54.1 t ADT: 25

CH 48

Good

Over: MCKEE CREEK

4.6 MI NE LIBERTY, Adams, IL

Built 1959 Load: 54.4 t ADT: 950

CH 48

Good

Over: CURL CREEK

4.7 MI NE LIBERTY, Adams, IL

Built 1959 Load: 56.1 t ADT: 850

ILL 94

Good

Over: S FORK BEAR CREEK

1.6 S GOLDEN, Adams, IL

Built 1990 Load: 57.0 t ADT: 800

IL 96

Good

Over: BURTON CREEK

1.4MI SE I 172/IL96, Adams, IL

Built 2003 Load: 58.6 t ADT: 2,400

IL 104

Good

Over: FISHHOOK CREEK

1.6 MI W PIKE CO LIN, Adams, IL

Built 2004 Load: 58.6 t ADT: 775

ILL 104

Good

Over: BRANCH BURTON CREEK

4.4MI E I-172/IL 104, Adams, IL

Built 1987 Load: 88.8 t ADT: 5,100

BAYVIEW DRIVE

Good

Over: CEDAR CREEK

BAYVIEW DRIVE, Adams, IL

Built 1967 Load: 89.1 t ADT: 1,150

33RD ST

Good

Over: .5 BLOCK S RTE 104

CITY OF QUINCY, Adams, IL

Built 1974 Load: 89.1 t ADT: 2,050

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.