Total Bridges
20,753
Public highway bridges in Iowa
State profile · Above median Poor share
Iowa bridge safety
Condition ratings, load ratings, and Poor-condition data for every public highway bridge in Iowa, based on the FHWA National Bridge Inventory.
- 20,753
- Public bridges
- 36.5%
- Good condition
- 20.0%
- Poor condition
Data updated May 2026
Good Condition
36.5%
7,582 bridges rated 7-9
-13.5pp vs 50% benchmark
Poor Condition
20.0%
4,153 bridges whose lowest applicable component is rated 0-4
13.0pp vs national avg 7.0%
Iowa vs national bridge condition
Iowa - Good condition share 36.5%
National avg
Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).
Iowa - Poor-condition share 66.7%
National avg
Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.
Condition Distribution
Counties (99)
Adair 208 Adams 147 Allamakee 170 Appanoose 159 Audubon 161 Benton 327 Black Hawk 411 Boone 119 Bremer 220 Buchanan 281 Buena Vista 140 Butler 261 Calhoun 171 Carroll 223 Cass 237 Cedar 265 Cerro Gordo 210 Cherokee 223 Chickasaw 268 Clarke 150 Clay 138 Clayton 214 Clinton 325 Crawford 242 Dallas 154 Davis 156 Decatur 178 Delaware 254 Des Moines 156 Dickinson 73 Dubuque 304 Emmet 70 Fayette 288 Floyd 195 Franklin 214 Fremont 133 Greene 150 Grundy 270 Guthrie 236 Hamilton 134 Hancock 128 Hardin 211 Harrison 162 Henry 144 Howard 193 Humboldt 70 Ida 164 Iowa 189 Jackson 209 Jasper 321 Jefferson 142 Johnson 317 Jones 215 Keokuk 152 Kossuth 256 Lee 185 Linn 428 Louisa 134 Lucas 186 Lyon 241 Madison 221 Mahaska 219 Marion 204 Marshall 283 Mills 170 Mitchell 160 Monona 125 Monroe 126 Montgomery 184 Muscatine 127 O'Brien 229 Osceola 176 Page 185 Palo Alto 114 Plymouth 407 Pocahontas 186 Polk 415 Pottawattamie 469 Poweshiek 221 Ringgold 206 Sac 188 Scott 212 Shelby 194 Sioux 429 Story 262 Tama 307 Taylor 220 Union 153 Van Buren 142 Wapello 160 Warren 231 Washington 203 Wayne 163 Webster 179 Winnebago 48 Winneshiek 317 Woodbury 379 Worth 89 Wright 168
Iowa vs nearby ranks
Adjacent states by Poor-condition share (lower share = better)
States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below Iowa on the same metric.
WV
West Virginia
16.02% top marginal rate
SD
South Dakota
16.24% top marginal rate
IA
Iowa
20.01% top marginal rate
VI
Virgin Islands
29.17% top marginal rate
Bridges Needing Most Attention in Iowa
Six lowest-condition bridges in Iowa, ranked by the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.
270TH STREET
PoorOver: ROSE BRANCH
071343401, Adams, IA
Built 1976 Load: 2.7 t ADT: 79
LOCAL
PoorOver: CREEK
078342601, Audubon, IA
Built 1935 Load: 2.7 t ADT: 21
KLINE RD
PoorOver: MUD CREEK
87-12-15-02-10, Black Hawk, IA
Built 1948 Load: 2.7 t ADT: 11
LOCAL - 700TH
PoorOver: TRIB TROUBLESOME CREEK
077351402, Cass, IA
Built 1983 Load: 2.7 t ADT: 11
LOCAL - DAYTONA
PoorOver: BUCK CREEK
077361903, Cass, IA
Built 1980 Load: 2.7 t ADT: 35
100TH ST.
PoorOver: UNION CREEK
083E20101, Clinton, IA
Built 1900 Load: 2.7 t ADT: 78
All Bridges in Iowa
DEER CREEK RD
FairOver: STREAM
000000000, Johnson, IA
Built 1972 Load: 32.8 t ADT: 1,267
FM SUTLIFF RD
FairOver: CLEAR CREEK
081050102, Johnson, IA
Built 1974 Load: 32.8 t ADT: 610
FM
FairOver: CEDAR CREEK
071180403, Monroe, IA
Built 1975 Load: 32.8 t ADT: 90
FM
FairOver: CREEK
076041308, Muscatine, IA
Built 1954 Load: 32.8 t ADT: 180
FM RT C 56
FairOver: LIZARD CREEK
090311201, Pocahontas, IA
Built 1978 Load: 32.8 t ADT: 50
SB US 65
FairOver: SOUTH SKUNK RIVER
7.6 MILES N OF JCT I-80, Polk, IA
Built 2000 Load: 32.8 t ADT: 4,800
FM-COUGAR AVE
FairOver: PIGEON CREEK
076430503, Pottawattamie, IA
Built 1976 Load: 32.8 t ADT: 150
FM
FairOver: CEDAR CR
073132606, Wapello, IA
Built 1975 Load: 32.8 t ADT: 35
FM
FairOver: SOUTH FORK LONG CREEK
075070501, Washington, IA
Built 1979 Load: 32.8 t ADT: 2,280
FM
FairOver: DAVIS CREEK
076060105, Washington, IA
Built 1980 Load: 32.8 t ADT: 70
FM
FairOver: VILLAGE CREEK
099033305, Allamakee, IA
Built 1981 Load: 32.9 t ADT: 707
LOCAL
FairOver: BR CHARITON CREEK
071242503, Clarke, IA
Built 1985 Load: 32.9 t ADT: 40
FM 320TH ST
FairOver: BIG MEADOW CREEK
097363501, Clay, IA
Built 1978 Load: 32.9 t ADT: 80
FM
FairOver: BOONE RIVER
087263010, Hamilton, IA
Built 1939 Load: 32.9 t ADT: 478
I 380 SB
FairOver: EAST BLUE CREEK
2.3 mi. N of Jct. SR W35, Linn, IA
Built 1982 Load: 32.9 t ADT: 10,750
FM
FairOver: HICKORY CREEK
074202401, Marion, IA
Built 1945 Load: 32.9 t ADT: 400
US 34
FairOver: FOUR MILE CREEK
2 MI. E OF E JCT. US 169, Union, IA
Built 1971 Load: 32.9 t ADT: 3,040
LOCAL ROAD
FairOver: CREEK
098091402, Winneshiek, IA
Built 1900 Load: 32.9 t ADT: 59
LOCAL
FairOver: SMALL
099083106, Winneshiek, IA
Built 1978 Load: 32.9 t ADT: 39
FM
FairOver: PLUNGER CREEK
077302101, Adair, IA
Built 1963 Load: 33.0 t ADT: 79
LOCAL
FairOver: FORK PRAIRIE CREEK
083111902, Benton, IA
Built 1976 Load: 33.0 t ADT: 15
FM
FairOver: W BLUE CK
086092302, Benton, IA
Built 1974 Load: 33.0 t ADT: 69
E BIG ROCK RD
FairOver: ELK RUN CREEK
89-12-03-01-10, Black Hawk, IA
Built 1963 Load: 33.0 t ADT: 49
FM 252ND ST
FairOver: STREAM
091112403, Bremer, IA
Built 1972 Load: 33.0 t ADT: 334
212TH ST
FairOver: STREAM
092133105, Bremer, IA
Built 1966 Load: 33.0 t ADT: 638
FM
FairOver: BROOKS CREEK
091370701, Buena Vista, IA
Built 1977 Load: 33.0 t ADT: 34
LOCAL
FairOver: HARDING CREEK
086312601, Calhoun, IA
Built 1984 Load: 33.0 t ADT: 11
LOCAL
FairOver: W.CEDAR CR.
087313001, Calhoun, IA
Built 1978 Load: 33.0 t ADT: 26
FM
FairOver: W.CEDAR CR.
087313101, Calhoun, IA
Built 1979 Load: 33.0 t ADT: 15
FM
FairOver: D.D. 95
087313501, Calhoun, IA
Built 1976 Load: 33.0 t ADT: 26
FM
FairOver: D.D. 95
087313501, Calhoun, IA
Built 1974 Load: 33.0 t ADT: 26
LOCAL
FairOver: DRAINAGE DITCH
088310101, Calhoun, IA
Built 1974 Load: 33.0 t ADT: 15
LOCAL
FairOver: D.D. NO 12
088310301, Calhoun, IA
Built 1972 Load: 33.0 t ADT: 50
LOCAL
FairOver: COUNTY DRAIN #31
088311301, Calhoun, IA
Built 1984 Load: 33.0 t ADT: 11
LOCAL
FairOver: D.D. NO 31
088311302, Calhoun, IA
Built 1974 Load: 33.0 t ADT: 34
LOCAL
FairOver: WELSH SLOUGH
088312301, Calhoun, IA
Built 1974 Load: 33.0 t ADT: 20
LOCAL
FairOver: DD #31
088312304, Calhoun, IA
Built 1983 Load: 33.0 t ADT: 20
LOCAL RD
FairOver: D.D. NO 31
088312602, Calhoun, IA
Built 1974 Load: 33.0 t ADT: 34
LOCAL
FairOver: DD 12&22
088313402, Calhoun, IA
Built 1983 Load: 33.0 t ADT: 50
LOCAL
FairOver: DRAINAGE DITCH 9-13
088321701, Calhoun, IA
Built 1983 Load: 33.0 t ADT: 11
LOCAL
FairOver: LAKE CREEK
088321702, Calhoun, IA
Built 1985 Load: 33.0 t ADT: 34
LOCAL
FairOver: DD 9-13
088321702, Calhoun, IA
Built 1979 Load: 33.0 t ADT: 34
LOCAL
FairOver: DRAINAGE DITCH #67
088331001, Calhoun, IA
Built 1983 Load: 33.0 t ADT: 15
LOCAL
FairOver: DD 67
088331502, Calhoun, IA
Built 1976 Load: 33.0 t ADT: 45
LOCAL
FairOver: DD 67
088331602, Calhoun, IA
Built 1976 Load: 33.0 t ADT: 26
FM
FairOver: DD 67
088331702, Calhoun, IA
Built 1976 Load: 33.0 t ADT: 26
FM
FairOver: DD 67
088331901, Calhoun, IA
Built 1972 Load: 33.0 t ADT: 5
LOCAL
FairOver: CO DRAIN #1-54
088340901, Calhoun, IA
Built 1984 Load: 33.0 t ADT: 30
FM - 690TH
FairOver: WATERWAY
076351502, Cass, IA
Built 1970 Load: 33.0 t ADT: 450
220TH ST
FairOver: ROCK RUN CREEK
080030505, Cedar, IA
Built 1975 Load: 33.0 t ADT: 71
Showing 7,101-7,150 of 20,753 bridges
Related
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.
Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the FHWA National Bridge Inventory (NBI). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.
Understanding Bridge Conditions
How FHWA rates bridge condition on a 0-9 scale.
Check Your Daily Bridges
How to look up bridge condition data for bridges on your route.
Read our methodology — how this data is sourced, computed, and verified.
Every figure on PlainBridge 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.