Total bridges
292
Public highway bridges in Hancock County
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.
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
- 1900s 8
1900–1909
8 bridges
- 1910s 13
1910–1919
13 bridges
- 1920s 13
1920–1929
13 bridges
- 1930s 6
1930–1939
6 bridges
- 1940s 1
1940–1949
1 bridges
- 1950s 11
1950–1959
11 bridges
- 1960s
1960–1969
33 bridges
- 1970s
1970–1979
36 bridges
- 1980s
1980–1989
71 bridges
- 1990s
1990–1999
39 bridges
- 2000s
2000–2009
33 bridges
- 2010s 24
2010–2019
24 bridges
- 2020s 4
2020–2029
4 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).
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.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Coles County | 304 | 39.5% | 51.6% | 8.9% | 1981 |
| Knox County | 304 | 49.3% | 39.5% | 11.2% | 1982 |
| Ford County | 302 | 55.6% | 38.1% | 6.3% | 1983 |
| Marion County | 296 | 62.5% | 31.1% | 6.4% | 1973 |
| Logan County | 292 | 29.8% | 62% | 8.2% | 1975 |
| Hancock County (this page) | 292 | 41.8% | 38% | 20.2% | 1977 |
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).
- Canyon County, ID · 292 bridges
- Jackson County, OK · 292 bridges
- Clearfield County, PA · 292 bridges
- Boone County, IN · 293 bridges
Similar average build year
Nearest mean year-built outside IL (1977 here).
- San Diego County, CA · avg 1977 · 1,632 bridges
- King County, WA · avg 1977 · 1,238 bridges
- Riverside County, CA · avg 1977 · 1,117 bridges
- Shelby County, TN · avg 1977 · 1,077 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (111)
TR 302
FairOver: CEDAR CREEK
2.5 MI SW FOUNTAINGR, Hancock, IL
Built 1979 Load: 32.4 t ADT: 50
TR 221
FairOver: E FK OF LAMOINE R.
4.5MI N OF ST. MARY, Hancock, IL
Built 1981 Load: 32.4 t ADT: 50
TR 227
FairOver: LITTLE CREEK
1.25 NE MIDDLE CREEK, Hancock, IL
Built 1987 Load: 32.4 t ADT: 100
TR 295
FairOver: BRONSON CREEK
2.5 NE DENVER, Hancock, IL
Built 1987 Load: 32.4 t ADT: 50
TR 240
FairOver: BRONSON CREEK
3.5 NE DENVER, Hancock, IL
Built 1981 Load: 32.4 t ADT: 50
TR 266
FairOver: SPRING CREEK
0.9 MI S OF DISCO, Hancock, IL
Built 1980 Load: 32.4 t ADT: 100
TR 344
FairOver: LA HARPE CREEK
2.0 MI S LA HARPE, Hancock, IL
Built 1994 Load: 32.4 t ADT: 75
TR 400
FairOver: S BRHN OF CROOKED CR
2.0 MI E LAHARPE, Hancock, IL
Built 1983 Load: 32.4 t ADT: 50
TR 58
FairOver: RAILROAD CREEK
2.0 SE HAMILTON, Hancock, IL
Built 1983 Load: 32.4 t ADT: 150
TR 3A
FairOver: SYCAMORE CREEK
.4 MI N OF NAUVOO, Hancock, IL
Built 1986 Load: 32.4 t ADT: 450
TR 200A
FairOver: SHORT CREEK
2MI S BURNSIDE, Hancock, IL
Built 1993 Load: 32.4 t ADT: 50
TR 91
FairOver: WILDCAT CREEK
1.7 W LACROSSE, Hancock, IL
Built 1982 Load: 32.4 t ADT: 125
TR 214
FairOver: SHORT CREEK
3.0 SE BURNSIDE, Hancock, IL
Built 1981 Load: 32.4 t ADT: 150
TR 225
FairOver: WEST FORK BEAR CR
.1 MI SE ELVASTON, Hancock, IL
Built 1981 Load: 32.4 t ADT: 100
TR 154
FairOver: ROCK CREEK
.5 MI. N OF FERRIS, Hancock, IL
Built 1982 Load: 32.4 t ADT: 100
TR 379
FairOver: THE BLUFF CANAL
5.5 S WARSAW, Hancock, IL
Built 1986 Load: 32.4 t ADT: 125
TR 104
FairOver: TRIB OF PANTHER CR
3.0 W STILLWELL, Hancock, IL
Built 1979 Load: 32.4 t ADT: 50
TR 339
FairOver: BEAR CREEK
3.0 NW WEST POINT, Hancock, IL
Built 1983 Load: 32.4 t ADT: 50
FAS 430
FairOver: LITTLE CREEK
1MI S OF MIDDLECREEK, Hancock, IL
Built 1992 Load: 32.4 t ADT: 25
TR 334
FairOver: PANTHER CREEK
2.0 SW ST MARY, Hancock, IL
Built 1983 Load: 32.4 t ADT: 25
TR 133
FairOver: N FK OF LARRYS CR
5.5 SW NAUVOO, Hancock, IL
Built 1984 Load: 32.4 t ADT: 75
1ST STREET
FairOver: CREEK
DALLAS CITY, Hancock, IL
Built 1993 Load: 32.4 t ADT: 200
IL 96
FairOver: TYSON CREEK
1.7M S IL 9 NIOTA, Hancock, IL
Built 1977 Load: 33.0 t ADT: 1,700
TR 258
FairOver: FLOUR CREEK
1.5 MI SE BOWEN, Hancock, IL
Built 1976 Load: 33.0 t ADT: 125
US 136
FairOver: MISS R/1ST/KEOKUK JCT RR
HAMILTN IL-KEOKUK IA, Hancock, IL
Built 1985 Load: 33.4 t ADT: 10,500
TR 166
FairOver: GROVE CREEK
1.5 NE ADRIAN, Hancock, IL
Built 1961 Load: 33.7 t ADT: 50
TR 84
FairOver: S FK OF LARRYS CR
5.0 W FERRIS, Hancock, IL
Built 1962 Load: 33.7 t ADT: 175
IL 96
FairOver: WAGGONER CREEK
4.2M N US136 HAMILTN, Hancock, IL
Built 1981 Load: 34.0 t ADT: 1,100
WARSAW (IL 96) SPU
FairOver: CEDAR GLEN CREEK
.8M W IL96/E WARSAW, Hancock, IL
Built 1930 Load: 34.3 t ADT: 1,150
IL 96
FairOver: DRAINAGE DITCH
5.8M S NAUVOO CENTER, Hancock, IL
Built 1936 Load: 34.7 t ADT: 1,050
TR 438
FairOver: MUD CREEK
3.5 S WEST POINT, Hancock, IL
Built 1936 Load: 35.0 t ADT: 50
IL 61
FairOver: FLOUR CREEK
2.8M E IL 94 BOWEN, Hancock, IL
Built 1927 Load: 35.6 t ADT: 1,250
IL 9/94
FairOver: LAMOINE RIVER
5.2M E IL 94 S, Hancock, IL
Built 1984 Load: 35.6 t ADT: 1,050
CO HWY 24
FairOver: S BRH OF LARRYS CR
6.5 W FERRIS, Hancock, IL
Built 2005 Load: 35.6 t ADT: 850
TR 3
FairOver: BRANCH OF TYSON CR.
0.9 MI SW OF NIOTA, Hancock, IL
Built 1963 Load: 35.6 t ADT: 225
IL 96
FairOver: GRAY BAY
2.5M N US136 HAMILTN, Hancock, IL
Built 1981 Load: 36.0 t ADT: 1,100
TR 356
FairOver: LITTLE LINDA CREEK
2.8 M N OF ST MARY, Hancock, IL
Built 1978 Load: 36.0 t ADT: 100
TR 180
FairOver: GROVE CREEK
3.4 NW BURNSIDE, Hancock, IL
Built 1979 Load: 36.0 t ADT: 50
TR 99
FairOver: LITTLE CREEK
3.5 MI S LAHARPE, Hancock, IL
Built 1979 Load: 36.6 t ADT: 50
TR 301
FairOver: TRIB LITTLE BEAR CR
3 MI SE WARSAW, Hancock, IL
Built 1963 Load: 37.6 t ADT: 50
IL 96
FairOver: LARRY CREEK
5.3M N US136 HAMILTN, Hancock, IL
Built 1936 Load: 38.2 t ADT: 1,050
IL 96
FairOver: CHANEY CREEK
.5M N US136 HAMILTON, Hancock, IL
Built 1935 Load: 39.5 t ADT: 1,650
IL 61
FairOver: FLOUR CREEK
3.6M N IL101-AUGUSTA, Hancock, IL
Built 2001 Load: 39.5 t ADT: 1,100
TR 73
FairOver: LA HARPE CREEK
2.5 SE LAHARPE, Hancock, IL
Built 1978 Load: 39.5 t ADT: 75
TR 52
FairOver: ROBINSON CREEK
2.0 MI E NAUVOO, Hancock, IL
Built 1984 Load: 39.9 t ADT: 50
IL 94
FairOver: LONG CREEK
1.1M N US136 CARTHAG, Hancock, IL
Built 1932 Load: 40.2 t ADT: 3,750
FAS 422
FairOver: CHANEY CREEK
2.0 MI NE HAMILTON, Hancock, IL
Built 1986 Load: 41.1 t ADT: 850
US 136
FairOver: DRAINAGE DITCH
1.7M W IL 61, Hancock, IL
Built 1991 Load: 42.1 t ADT: 3,400
TR 163
FairOver: SHORT CREEK
3.5 MI NE CARTHAGE, Hancock, IL
Built 1985 Load: 43.1 t ADT: 250
TR 366
FairOver: TRIB OF ROCK CREEK
2.0 E FOUNTAIN GREEN, Hancock, IL
Built 1987 Load: 43.7 t ADT: 50
Read our methodology - how this data is sourced, computed, and verified.
Related
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.