Total bridges
199
Public highway bridges in Warren County
County profile · official public datasets
Warren County, IL
199 public highway bridges tracked in the FHWA National Bridge Inventory: 69.3% rated Good, 23.1% Fair, 7.5% Poor.
- 199
- Public bridges
- 69.3%
- Good condition
- 7.5%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Warren County pairs a better-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.
- Top 50%
- lowest Poor share in state
- 7.5%
- Poor-condition share
- 199
- public highway bridges
- 1985
- 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.
Warren County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Warren County ranks #51 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 7.5%). Warren County, Illinois contains 199 public highway bridges. Roughly 69.3% are rated “Good,” 23.1% “Fair,” and 7.5% “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
69.3%
138 of 199 rated 7-9
Fair condition
23.1%
46 of 199 rated 5-6
Poor condition
7.5%
15 of 199 rated 4 or below
In-state Poor-share rank
#51 of 102
Among Illinois counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 199 NBI-tracked bridges by lowest applicable component rating.
Good 69.3% (138)
Fair 23.1% (46)
Poor 7.5% (15)
Warren County's Poor-condition bridges carry 38,045 vehicle crossings a day
That is 19% of the county's reported daily bridge traffic on 7.5% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 2,536 crossings a day against 414 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 199 of 199 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
17.6% of Warren County's bridges have passed the 50-year mark
35 of the 199 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 69.3% 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 24.8% of the county's Poor-condition bridge traffic
US 34 IL 164 IL 1 over CEDAR CR TRIB, built 1964, carries 9,450 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 15-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 38,045 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Warren County's bridges were built
199 bridges with a recorded construction year, grouped by decade
- 1900s 7
1900–1909
7 bridges
- 1910s 1
1910–1919
1 bridges
- 1930s 5
1930–1939
5 bridges
- 1940s 2
1940–1949
2 bridges
- 1950s 3
1950–1959
3 bridges
- 1960s 7
1960–1969
7 bridges
- 1970s
1970–1979
33 bridges
- 1980s
1980–1989
53 bridges
- 1990s
1990–1999
43 bridges
- 2000s
2000–2009
28 bridges
- 2010s 10
2010–2019
10 bridges
- 2020s 7
2020–2029
7 bridges
What this shows Construction peaked in the 1980s, when 53 of the county's bridges still in the inventory were built, which is 26.6% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year is 1985, 6 years newer than the Illinois average of 1979.
How Warren County compares with Illinois's closest counties by inventory size
The 5 Illinois counties nearest Warren County in number of bridges, with their condition splits. Its 7.5% Poor share is the 5th-lowest of these 6. Its average build year of 1985 against a peer-group mean of 1980 is 5 years newer.
Showing the 5 closest of 101 Illinois counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Williamson County | 201 | 67.2% | 29.4% | 3.5% | 1985 |
| Warren County (this page) | 199 | 69.3% | 23.1% | 7.5% | 1985 |
| Crawford County | 197 | 33% | 60.9% | 6.1% | 1983 |
| Jo Daviess County | 193 | 46.1% | 44% | 9.8% | 1973 |
| De Witt County | 192 | 57.3% | 37% | 5.7% | 1980 |
| Union County | 192 | 54.7% | 41.7% | 3.6% | 1981 |
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 Warren 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 Warren County, both outside Illinois so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside IL (199 bridges here).
- Montgomery County, AR · 199 bridges
- Dallas County, IA · 199 bridges
- Leake County, MS · 199 bridges
- Neshoba County, MS · 199 bridges
Similar average build year
Nearest mean year-built outside IL (1985 here).
- Hillsborough County, FL · avg 1985 · 840 bridges
- Lancaster County, NE · avg 1985 · 661 bridges
- Nueces County, TX · avg 1985 · 528 bridges
- Grayson County, TX · avg 1985 · 513 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (46)
TR 152
FairOver: CEDAR CR
NW-24-T11NR2W, Warren, IL
Built 1900 Load: 6.5 t ADT: 25
TR 252
FairOver: MID HEND CR
NW-1-T12NR1W, Warren, IL
Built 1900 Load: 12.0 t ADT: 75
TR 108
FairOver: BR CROOKED CR
SE-33-T8NR2W, Warren, IL
Built 1916 Load: 17.5 t ADT: 25
TR 18
FairOver: SO HEND CR
NE-30-T10NR3W, Warren, IL
Built 1973 Load: 20.4 t ADT: 25
FAS 413 - CH 11
FairOver: S HENDERSON CR
SW-21-T10NR3W, Warren, IL
Built 1949 Load: 21.4 t ADT: 450
CH 13
FairOver: DAVIDS CR
N.CTR-34-T12NR3W, Warren, IL
Built 1939 Load: 21.4 t ADT: 175
TR 7
FairOver: DUCK CR
SE-6-T12NR3W, Warren, IL
Built 1956 Load: 21.7 t ADT: 50
TR 58
FairOver: CEDAR CR
N.CTR-26-T12NR3W, Warren, IL
Built 1974 Load: 22.4 t ADT: 50
TR 181
FairOver: PICAYUNE CREEK TRIB
N.CTR-1-T9NR2W, Warren, IL
Built 1977 Load: 24.3 t ADT: 100
TR 104A
FairOver: BR OF CEDAR CR
CTR-9-T11NR2W, Warren, IL
Built 1975 Load: 24.3 t ADT: 50
TR 48
FairOver: SOUTH FORK CR
W1/2-2-T9NR3W, Warren, IL
Built 1971 Load: 24.3 t ADT: 25
TR 139
FairOver: OLD TOM CR
SE-32-T11NR3W, Warren, IL
Built 1900 Load: 24.3 t ADT: 75
TR 20
FairOver: DAVIDS CR
NW-29-T12NR3W, Warren, IL
Built 1978 Load: 24.3 t ADT: 50
TR 101
FairOver: BR CEDAR CR
SW-16-T11NR2W, Warren, IL
Built 1970 Load: 24.6 t ADT: 650
TR 152
FairOver: TALBOT CREEK
SW 1/4 SEC 1 T11NR2W, Warren, IL
Built 1973 Load: 28.5 t ADT: 25
CH 19
FairOver: SWAN CREEK
NE-26-T8NR3W, Warren, IL
Built 1961 Load: 30.8 t ADT: 200
FAS 1405
FairOver: HENDERSON CREEK
SW-24-T12NR1W, Warren, IL
Built 1985 Load: 32.4 t ADT: 50
FAS 1405-CH 2
FairOver: MIDDLE HENDERSON CR
NW-2-T12NR1W, Warren, IL
Built 1939 Load: 33.0 t ADT: 100
TR 122
FairOver: HENDERSON CREEK
SE-15-T12NR2W, Warren, IL
Built 1977 Load: 33.4 t ADT: 25
US 34 & 67 (SB)
FairOver: BNSF RR (079039A)
0.8MI N JCT US 34&67, Warren, IL
Built 1992 Load: 34.0 t ADT: 8,100
ILL 135
FairOver: DAVIDS CR
.5 MI S LITTLE YORK, Warren, IL
Built 1930 Load: 36.3 t ADT: 1,150
NB US 67
FairOver: S. HENDERSON CREEK
2.8 MI S OF US 34, Warren, IL
Built 1992 Load: 37.3 t ADT: 4,500
SB US 67
FairOver: S. HENDERSON CREEK
2.8 MI S OF US 34, Warren, IL
Built 1992 Load: 37.3 t ADT: 4,500
NB US 67
FairOver: SWAN CREEK
4.5 MI S ROSEVILLE, Warren, IL
Built 1996 Load: 37.9 t ADT: 4,900
SB US 67
FairOver: SWAN CREEK
4.5 MI S ROSEVILLE, Warren, IL
Built 1996 Load: 37.9 t ADT: 4,900
NB US 67
FairOver: BIG NEGRO CREEK
3 MI S ILL 116, Warren, IL
Built 1996 Load: 38.2 t ADT: 4,900
US 34
FairOver: US 67
SW EDGE OF MONMOUTH, Warren, IL
Built 1992 Load: 38.9 t ADT: 2,800
ILL. 164
FairOver: CEDAR CREEK TRIB.
.1MI W of Knox Co Ln, Warren, IL
Built 1991 Load: 39.2 t ADT: 3,150
ILL 135
FairOver: CEDAR CREEK
N EDGE LITTLE YORK, Warren, IL
Built 1987 Load: 39.5 t ADT: 1,200
SB US 67
FairOver: CEDAR CREEK
4 MI N OF ROSEVILLE, Warren, IL
Built 1995 Load: 40.5 t ADT: 4,000
OLD US 67
FairOver: TRIB TOWN BRANCH CR
0.5 MI N OF ILL 116, Warren, IL
Built 2002 Load: 40.5 t ADT: 800
US 67
FairOver: HENDERSON CREEK
2.4 MI S OF ILL 135, Warren, IL
Built 2001 Load: 42.1 t ADT: 2,250
SB US 67
FairOver: BIG NEGRO CREEK
3 MI S OF IL116, Warren, IL
Built 1996 Load: 42.4 t ADT: 4,900
NB US 67
FairOver: CEDAR CREEK
4 MI N OF ROSEVILLE, Warren, IL
Built 1995 Load: 43.1 t ADT: 4,000
ILL 116
FairOver: NEGRO CREEK
6 MI E OF ROSEVILLE, Warren, IL
Built 1987 Load: 45.4 t ADT: 1,050
US 67
FairOver: TOMS CREEK
0.1 MI W OF ILL 135, Warren, IL
Built 2007 Load: 46.0 t ADT: 2,050
ILL 135
FairOver: CEDAR CR OVERFLOW
.5 MI N LITTLE YORK, Warren, IL
Built 1987 Load: 47.3 t ADT: 1,200
IL 164
FairOver: Cedar Creek
1.51 mi NE of US 34, Warren, IL
Built 2017 Load: 48.0 t ADT: 1,500
ILL 94 & 135
FairOver: HENDERSON CR
2 MI N LITTLE YORK, Warren, IL
Built 1931 Load: 54.4 t ADT: 1,300
IL 135
FairOver: JOHNS CREEK
1.5 MI S.LITTLE YORK, Warren, IL
Built 1999 Load: 54.8 t ADT: 1,150
US 67
FairOver: CEDAR CR
4 MI N OF MONMOUTH, Warren, IL
Built 2011 Load: 56.1 t ADT: 2,600
ILL 116
FairOver: ELLISON CREEK
4 MI W OF ROSEVILLE, Warren, IL
Built 1991 Load: 64.8 t ADT: 850
US 34
FairOver: TRIB TO CEDAR CR
4 MI E OF MONMOUTH, Warren, IL
Built 1979 Load: 97.2 t ADT: 8,050
US 34
FairOver: TR 206 (150TH ST)
NW 1/4 SEC27 T11NR1W, Warren, IL
Built 1985 Load: 97.2 t ADT: 8,950
US 34
FairOver: TRIB TO CEDAR CR
0.4M E OF CAMERON RD, Warren, IL
Built 1986 Load: 99.9 t ADT: 8,950
US 34
FairOver: TRIB TO CEDAR CR
1.6M W OF KNOX CO LN, Warren, IL
Built 1986 Load: 99.9 t ADT: 8,950
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.