Total bridges
239
Public highway bridges in Warren County
County profile · official public datasets
Warren County, IA
239 public highway bridges tracked in the FHWA National Bridge Inventory: 42.7% rated Good, 36.8% Fair, 20.5% Poor.
- 239
- Public bridges
- 42.7%
- Good condition
- 20.5%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Warren County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 56th
- of 99 on Poor share
- 20.5%
- Poor-condition share
- 239
- public highway bridges
- 1983
- 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 #56 of 99 Iowa counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 20.5%). Warren County, Iowa contains 239 public highway bridges. Roughly 42.7% are rated “Good,” 36.8% “Fair,” and 20.5% “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
42.7%
102 of 239 rated 7-9
Fair condition
36.8%
88 of 239 rated 5-6
Poor condition
20.5%
49 of 239 rated 4 or below
In-state Poor-share rank
#56 of 99
Among Iowa counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 239 NBI-tracked bridges by lowest applicable component rating.
Good 42.7% (102)
Fair 36.8% (88)
Poor 20.5% (49)
Warren County's Poor-condition bridges carry 8,666 vehicle crossings a day
That is 1.9% of the county's reported daily bridge traffic on 20.5% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 177 crossings a day against 2,840 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 239 of 239 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
41% of Warren County's bridges have passed the 50-year mark
98 of the 239 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 42.7% 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 19.8% of the county's Poor-condition bridge traffic
FM over NORTH RIVER, built 1960, carries 1,714 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 49-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 8,666 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
239 bridges with a recorded construction year, grouped by decade
- 1900s 1
1900–1909
1 bridges
- 1910s 1
1910–1919
1 bridges
- 1920s 4
1920–1929
4 bridges
- 1940s 17
1940–1949
17 bridges
- 1950s
1950–1959
30 bridges
- 1960s
1960–1969
23 bridges
- 1970s
1970–1979
34 bridges
- 1980s
1980–1989
29 bridges
- 1990s
1990–1999
24 bridges
- 2000s
2000–2009
25 bridges
- 2010s
2010–2019
43 bridges
- 2020s 8
2020–2029
8 bridges
What this shows Construction peaked in the 2010s, when 43 of the county's bridges still in the inventory were built, which is 18% of those with a recorded year. That cohort is now 5 to 14 years old in the 2024 inventory. Its average build year (1983) matches the Iowa average (1979).
How Warren County compares with Iowa's closest counties by inventory size
The 5 Iowa counties nearest Warren County in number of bridges, with their condition splits. Its 20.5% Poor share is the 4th-lowest of these 6. Its average build year of 1983 against a peer-group mean of 1979 is in line with the group.
Showing the 5 closest of 98 Iowa counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Cherokee County | 248 | 34.3% | 36.7% | 29% | 1968 |
| Jackson County | 246 | 26.4% | 56.5% | 17.1% | 1983 |
| Hardin County | 241 | 36.1% | 36.1% | 27.8% | 1981 |
| Iowa County | 241 | 37.3% | 43.6% | 19.1% | 1980 |
| Warren County (this page) | 239 | 42.7% | 36.8% | 20.5% | 1983 |
| Jones County | 231 | 36.8% | 58.9% | 4.3% | 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 Iowa so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside IA (239 bridges here).
- Greene County, IN · 239 bridges
- Wood County, WI · 239 bridges
- Jefferson Davis County, LA · 240 bridges
- St. Louis city County, MO · 240 bridges
Similar average build year
Nearest mean year-built outside IA (1983 here).
- Dallas County, TX · avg 1983 · 3,230 bridges
- Bexar County, TX · avg 1983 · 2,342 bridges
- Sedgwick County, KS · avg 1983 · 1,333 bridges
- Will County, IL · avg 1983 · 649 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (239)
US 65
FairOver: OTTER CREEK
1.6 MI. S OF JCT. SR G-58, Warren, IA
Built 1958 Load: 28.8 t ADT: 2,380
FM
FairOver: COAL CREEK
076222306, Warren, IA
Built 1984 Load: 29.0 t ADT: 439
LOCAL ROAD
FairOver: BRANCH OTTER CREEK
074233002, Warren, IA
Built 1970 Load: 29.2 t ADT: 41
FM
FairOver: WOLF CREEK
074220906, Warren, IA
Built 1975 Load: 29.9 t ADT: 887
FM
FairOver: COTTON CREEK
074222704, Warren, IA
Built 1969 Load: 30.4 t ADT: 400
NB US 65 & 69
FairOver: STREAM
0.2 mi. N of jct. SR G-24, Warren, IA
Built 1922 Load: 30.7 t ADT: 9,550
FM
FairOver: WHITE BREAST CREEK
074222705, Warren, IA
Built 1976 Load: 30.8 t ADT: 100
FM
FairOver: SOUTH RIVER
076233504, Warren, IA
Built 1979 Load: 30.8 t ADT: 1,330
FM
FairOver: DEER CREEK
077233111, Warren, IA
Built 1985 Load: 30.8 t ADT: 937
FM
FairOver: NORTH RIVER
077241606, Warren, IA
Built 1986 Load: 30.8 t ADT: 2,998
SB US 65 & 69
FairOver: MIDDLE RIVER
0.4 MI. S OF S.R. G-24, Warren, IA
Built 1970 Load: 32.7 t ADT: 9,000
I 35
FairOver: BROAD HORN CREEK
1.0 MI. N OF SR G-64, Warren, IA
Built 1957 Load: 32.7 t ADT: 21,000
I-35
FairOver: DRAINAGE DITCH
5.7 MI. S OF JCT. IA 92, Warren, IA
Built 1958 Load: 32.7 t ADT: 21,000
LOCAL ROAD
FairOver: WOLF CREEK
074221304, Warren, IA
Built 1994 Load: 32.7 t ADT: 15
FM
FairOver: WINN BRANCH WB CREEK
074222407, Warren, IA
Built 2003 Load: 32.7 t ADT: 500
LOCAL ROAD
FairOver: TURKEY CREEK
074230805, Warren, IA
Built 1975 Load: 32.7 t ADT: 11
FM
FairOver: INDIAN CREEK
074231810, Warren, IA
Built 1983 Load: 32.7 t ADT: 50
FM
FairOver: SKINAWAY CREEK
074242705, Warren, IA
Built 1986 Load: 32.7 t ADT: 499
FM
FairOver: MIDDLE RIVER
075250501, Warren, IA
Built 1976 Load: 32.7 t ADT: 34
LOCAL ROAD
FairOver: BRANCH SOUTH RIVER
075251204, Warren, IA
Built 1977 Load: 32.7 t ADT: 103
LOCAL ROAD
FairOver: BRANCH SOUTH RIVER
076233603, Warren, IA
Built 1975 Load: 32.7 t ADT: 134
LOCAL
FairOver: BRANCH MIDDLE RIVER
077242503, Warren, IA
Built 1988 Load: 32.7 t ADT: 103
G24
FairOver: BRANCH NORTH RIVER
077243101, Warren, IA
Built 1973 Load: 32.7 t ADT: 1,783
40TH AVE
FairOver: MID SOUTH CREEK
077251002, Warren, IA
Built 1983 Load: 32.7 t ADT: 932
LOCAL
FairOver: BUTCHER CREEK
077232604, Warren, IA
Built 1985 Load: 33.6 t ADT: 26
IA 92
FairOver: SOUTH RIVER
0.4 MI E OF E JCT SR S23, Warren, IA
Built 1983 Load: 34.7 t ADT: 2,190
SB IA 5
FairOver: NORTH RIVER
0.9 MI. S OF JCT US 65, Warren, IA
Built 1996 Load: 36.6 t ADT: 8,250
FM
FairOver: SOUTH RIVER
074251704, Warren, IA
Built 1986 Load: 37.1 t ADT: 100
BEARDSLEY STREET
FairOver: SM STREAM
077251200, Warren, IA
Built 1989 Load: 37.1 t ADT: 616
FM
FairOver: WHITE BREAST
074222403, Warren, IA
Built 1988 Load: 37.2 t ADT: 500
FM
FairOver: SOUTH RIVER
075240304, Warren, IA
Built 1990 Load: 37.7 t ADT: 780
FM
FairOver: OVER UP RR
077222906, Warren, IA
Built 1994 Load: 37.9 t ADT: 270
NB US 65 & 69
FairOver: NORTH RIVER
1.3 MI. S OF State Hwy 5, Warren, IA
Built 1970 Load: 38.5 t ADT: 10,050
SB IA 5
FairOver: SR R63 (SW 9TH)
2.9 mi. N of Jct. US 69, Warren, IA
Built 2000 Load: 38.8 t ADT: 10,550
NB IA 5
FairOver: SR R63 (SW 9TH)
2.9 mi. N of Jct. US 69, Warren, IA
Built 2000 Load: 38.8 t ADT: 10,550
FM
FairOver: MIDDLE RIVER
077231505, Warren, IA
Built 1994 Load: 41.5 t ADT: 409
FM
FairOver: CLANTON CREEK
076253206, Warren, IA
Built 1985 Load: 42.1 t ADT: 100
FM
FairOver: NORTH R OVERFLOW CHANNEL
077242104, Warren, IA
Built 1986 Load: 42.1 t ADT: 2,998
QUAKER ST
GoodOver: I-35
1.8 MI. N OF JCT. SR G-64, Warren, IA
Built 1958 Load: 15.6 t ADT: 45
US 65 & 69
GoodOver: SOUTH RIVER OVERFLOW
1.7 mi. S of IA 92, Warren, IA
Built 2011 Load: 23.3 t ADT: 5,400
FM
GoodOver: NORTH RIVER
077241104, Warren, IA
Built 1985 Load: 25.4 t ADT: 278
US 69
GoodOver: SKINAWAY CREEK
0.3 mi. S of SR G76, Warren, IA
Built 1987 Load: 28.2 t ADT: 1,210
IA 92
GoodOver: MIDDLE RIVER
0.3 MILE EAST OF IA 28, Warren, IA
Built 1982 Load: 29.9 t ADT: 4,160
IA 5
GoodOver: BUTCHER CREEK
0.7 MI. N OF SR G24, Warren, IA
Built 2001 Load: 29.9 t ADT: 9,100
IA 5 SB
GoodOver: SOUTH RIVER
0.2 mi. N of Jct. SR S31, Warren, IA
Built 2000 Load: 31.7 t ADT: 4,300
SB I 35
GoodOver: CLANTON CREEK
2.3 MILES S OF JCT IA 92, Warren, IA
Built 2007 Load: 31.8 t ADT: 11,400
US 65 & 69
GoodOver: SOUTH RIVER
2.0 MILES SOUTH OF IA 92, Warren, IA
Built 2016 Load: 32.4 t ADT: 5,400
US 65 & 69 NB
GoodOver: MIDDLE RIVER
0.4 mi. S of Jct. SR G-24, Warren, IA
Built 2016 Load: 32.4 t ADT: 8,950
US 65 & 69 SB
GoodOver: NORTH RIVER
1.3 mi. S of IA 5, Warren, IA
Built 2013 Load: 32.4 t ADT: 10,050
IA 92
GoodOver: I 35
At Jct I-35, Warren, IA
Built 2015 Load: 32.4 t ADT: 4,940
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.