County profile · official public datasets

Hancock County, IL

292 public highway bridges tracked in the FHWA National Bridge Inventory: 41.8% rated Good, 38% Fair, 20.2% Poor.

292
Public bridges
41.8%
Good condition
20.2%
Poor condition

The verdict

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

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

98th
of 102 on Poor share
20.2%
Poor-condition share
292
public highway bridges
1977
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.

Hancock County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Hancock County ranks #98 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 20.2%). Hancock County, Illinois contains 292 public highway bridges. Roughly 41.8% are rated “Good,” 38% “Fair,” and 20.2% “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

292

Public highway bridges in Hancock County

Good condition

41.8%

122 of 292 rated 7-9

Fair condition

38%

111 of 292 rated 5-6

Poor condition

20.2%

59 of 292 rated 4 or below

In-state Poor-share rank

#98 of 102

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

Condition distribution

Share of 292 NBI-tracked bridges by lowest applicable component rating.

Good
41.8% (122)
Fair
38% (111)
Poor
20.2% (59)

Hancock County's Poor-condition bridges carry 10,840 vehicle crossings a day

That is 6.7% of the county's reported daily bridge traffic on 20.2% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 184 crossings a day against 728 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 292 of 292 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

34.9% of Hancock County's bridges have passed the 50-year mark

102 of the 292 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 41.8% 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 23.1% of the county's Poor-condition bridge traffic

FAP 685 ILL 9 over MISSISSIPPI RIVER, built 1927, carries 2,500 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 59-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 10,840 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Hancock County's bridges were built

292 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1980s, when 71 of the county's bridges still in the inventory were built, which is 24.3% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1977) matches the Illinois average (1979).

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

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

The 5 Illinois counties nearest Hancock County in number of bridges, with their condition splits. Its 20.2% Poor share is the 6th-lowest of these 6. Its average build year of 1977 against a peer-group mean of 1979 is in line with the group.

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

Bridge inventory size and condition shares for Hancock County and the 5 Illinois counties closest to it in inventory size
County Bridges Poor
Coles County 304 8.9%
Knox County 304 11.2%
Ford County 302 6.3%
Marion County 296 6.4%
Logan County 292 8.2%
Hancock County (this page) 292 20.2%

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

Similar inventory size

Nearest county inventories outside IL (292 bridges here).

Similar average build year

Nearest mean year-built outside IL (1977 here).

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

All 292 Good 122 Fair 111 Poor 59

Good-condition bridges (122)

TR 413

Good

Over: PETIT CREEK

7 MI SE OF WARSAW, Hancock, IL

Built 1996 Load: 32.4 t ADT: 25

TR 411

Good

Over: TAYLOR SLOUGH

7.5 S WARSAW, Hancock, IL

Built 2006 Load: 32.4 t ADT: 75

TR 411

Good

Over: THE BLUFF CANAL

3.5 W TIOGA, Hancock, IL

Built 1983 Load: 32.4 t ADT: 75

TR 445

Good

Over: CO. LINE BRANCH

3.0 SW TIOGA, Hancock, IL

Built 1988 Load: 32.4 t ADT: 100

TR 90

Good

Over: TRIB OF N FK BEAR CR

3.5 W WEST POINT, Hancock, IL

Built 1984 Load: 32.4 t ADT: 50

TR 339

Good

Over: BEAR CREEK

2.0 NW WEST POINT, Hancock, IL

Built 1985 Load: 32.4 t ADT: 50

FAS 430

Good

Over: BRONSON CREEK

4.5 MI SE BENTLEY, Hancock, IL

Built 1991 Load: 32.4 t ADT: 25

TR 292

Good

Over: BRONSON CREEK

3.5 SW ST MARY, Hancock, IL

Built 1987 Load: 32.4 t ADT: 100

TR 334

Good

Over: BRONSON CREEK

2.0 SW ST MARY, Hancock, IL

Built 1981 Load: 32.4 t ADT: 25

TR 414

Good

Over: BRONSON CREEK

1.8MI N PLYMOUTH, Hancock, IL

Built 1997 Load: 32.4 t ADT: 50

TR 46

Good

Over: N FK OF RILEY CREEK

2.0 E NAUVOO, Hancock, IL

Built 1981 Load: 32.4 t ADT: 50

TR 68

Good

Over: RILEY CREEK

1.5 MI E NAUVOO, Hancock, IL

Built 1981 Load: 32.4 t ADT: 25

TR 123

Good

Over: N FK OF LARRYS CRK

4MI E SE NAUVOO, Hancock, IL

Built 1990 Load: 32.4 t ADT: 50

TR 145A

Good

Over: S Fk Larrys Creek

0.47 Mi E TR 84, Hancock, IL

Built 2016 Load: 32.4 t ADT: 50

TR 72

Good

Over: S. FK. OF LARRYS CR

6.0 MI W FERRIS, Hancock, IL

Built 1978 Load: 32.4 t ADT: 25

TR 54

Good

Over: Little Creek

1.27 mi S FAS 429, Hancock, IL

Built 2014 Load: 32.4 t ADT: 50

TR 415

Good

Over: LITTLE CREEK

2.5 E TIOGA, Hancock, IL

Built 1989 Load: 32.4 t ADT: 50

TR 369A

Good

Over: TRIB ROCKY RUN CREEK

3.5 N TIOGA, Hancock, IL

Built 1984 Load: 32.4 t ADT: 25

TR 28

Good

Over: CRYSTAL GLEN CREEK

1.5 S HAMILTON, Hancock, IL

Built 1981 Load: 32.4 t ADT: 150

TR 40

Good

Over: TRIB LITTLE BEAR CRK

3.5 SE WARSAW, Hancock, IL

Built 1990 Load: 32.4 t ADT: 200

TR 40

Good

Over: LITTLE BEAR CREEK

3.5 SE WARSAW, Hancock, IL

Built 1989 Load: 32.4 t ADT: 200

4TH STREET

Good

Over: UNNAMED CREEK

0.06 E IL 9, Hancock, IL

Built 2010 Load: 32.4 t ADT: 150

TR NO 360

Good

Over: FLOUR CREEK

1.75 MI N OF AUGUSTA, Hancock, IL

Built 1977 Load: 33.0 t ADT: 150

TR 164

Good

Over: CAMP CREEK

.5 M N COLUSA, Hancock, IL

Built 2009 Load: 33.4 t ADT: 125

IL 96

Good

Over: SONORA CREEK

4.9M S NAUVOO CENTER, Hancock, IL

Built 1981 Load: 34.0 t ADT: 1,050

IL 96

Good

Over: DRAINAGE DITCH

2.2 M E IL 9 NIOTA, Hancock, IL

Built 2013 Load: 34.0 t ADT: 1,550

IL 9/IL 96

Good

Over: OPPOSUM CR

.20 M W PONTOOSUC, Hancock, IL

Built 2008 Load: 35.3 t ADT: 1,550

IL 96

Good

Over: SIDE ROAD DITCH

1.4 MI E NIOTA, Hancock, IL

Built 2008 Load: 35.6 t ADT: 1,550

FAS 423 / CH 15

Good

Over: RILEYS CREEK

.5MI S POWELLTON, Hancock, IL

Built 1994 Load: 36.3 t ADT: 300

C.H. 33

Good

Over: SLATER CREEK

1 M W BOWEN, Hancock, IL

Built 2003 Load: 36.3 t ADT: 850

FAS 434 (CH 6)

Good

Over: La Moine River

1.04 mi W of IL 61, Hancock, IL

Built 1968 Load: 36.6 t ADT: 150

TR 71

Good

Over: WILDCAT CREEK

4.5 MI SW LAHARPE, Hancock, IL

Built 1980 Load: 37.6 t ADT: 50

TR 396

Good

Over: BAPTIST CREEK

3.1 NE FOUNTAINGREEN, Hancock, IL

Built 1985 Load: 37.6 t ADT: 50

IL 96

Good

Over: GLEN CREEK

.3M S WARSAW SPUR, Hancock, IL

Built 1994 Load: 37.9 t ADT: 2,000

FAP 685 (IL 9/IL 9

Good

Over: Branch Camp Creek

.4 mi E IL 94, Hancock, IL

Built 2015 Load: 37.9 t ADT: 1,000

CH 22

Good

Over: WHITE OAK CREEK

.75 M W TIOGA, Hancock, IL

Built 2008 Load: 37.9 t ADT: 100

FAS 1423

Good

Over: GROVE CREEK

2.75 M N BURNSIDE, Hancock, IL

Built 2003 Load: 38.2 t ADT: 125

FAS 426 / CH 17

Good

Over: LA HARPE CREEK

.2 MI W OF WEBSTER, Hancock, IL

Built 1994 Load: 38.2 t ADT: 225

CH 12

Good

Over: BLUFF CANAL

9.0 MI S WARSAW, Hancock, IL

Built 1999 Load: 38.6 t ADT: 350

IL 94

Good

Over: DEER CREEK

6.3M N US136 CARTHAG, Hancock, IL

Built 1994 Load: 38.9 t ADT: 2,000

TR 0311

Good

Over: LONG CREEK

0.5MI NO. CARTHAGE, Hancock, IL

Built 1989 Load: 38.9 t ADT: 75

TR 225

Good

Over: BEAR CREEK

1.5 SW CARTHAGE, Hancock, IL

Built 1985 Load: 39.2 t ADT: 100

ILL 94

Good

Over: LAMOINE RIVER

1.4 MI N JCT 9 & 94, Hancock, IL

Built 1992 Load: 40.5 t ADT: 1,250

TR 261

Good

Over: CRYSTAL CREEK

2.6 SE HAMILTON, Hancock, IL

Built 1984 Load: 40.5 t ADT: 50

IL 96

Good

Over: CRYSTAL CREEK

3.1M S US136 HAMILTN, Hancock, IL

Built 1994 Load: 40.8 t ADT: 1,900

IL 94

Good

Over: CAMP CREEK

150 ft. S IL 9/94, Hancock, IL

Built 1982 Load: 41.1 t ADT: 1,250

TR 175

Good

Over: Lamoine River

0.18 mi E TR 232, Hancock, IL

Built 2020 Load: 41.8 t ADT: 50

IL 9/96

Good

Over: SPILLMAN CREEK

.5M W MERCER PONTOOS, Hancock, IL

Built 1999 Load: 42.1 t ADT: 1,550

IL 96

Good

Over: DRAINAGE

1.4 M N OF US 136, Hancock, IL

Built 2013 Load: 42.1 t ADT: 1,100

FAS 431 (CH 30)

Good

Over: PANTHER CREEK

0.95 mi S FAS 429, Hancock, IL

Built 2013 Load: 42.1 t ADT: 225

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.