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
LOCAL 145 ST
FairOver: BEAR CREEK
090032803, Delaware, IA
Built 1976 Load: 24.6 t ADT: 78
LOC 120TH AVE
FairOver: STREAM
090062804, Delaware, IA
Built 1977 Load: 24.6 t ADT: 26
LOC 150TH ST
FairOver: SANDHAGEN CREEK
090063201, Delaware, IA
Built 1976 Load: 24.6 t ADT: 44
M AVE.
FairOver: COULEE CREEK
093081804, Fayette, IA
Built 1949 Load: 24.6 t ADT: 97
FM
FairOver: BRANCH BEAR CREEK
087183101, Grundy, IA
Built 1964 Load: 24.6 t ADT: 98
LOCAL
FairOver: SMALL CREEK
085E43405, Jackson, IA
Built 1992 Load: 24.6 t ADT: 29
SW BLACKHAWK AV
FairOver: MILLER CREEK
078081904, Johnson, IA
Built 2004 Load: 24.6 t ADT: 11
BUNKER HILL RD
FairOver: BEERS CREEK
084011303, Jones, IA
Built 1981 Load: 24.6 t ADT: 11
BUNKER HILL RD.
FairOver: BEERS CREEK
084011305, Jones, IA
Built 1977 Load: 24.6 t ADT: 11
LINN-JONES RD.
FairOver: SILVER CREEK
086041802, Jones, IA
Built 1990 Load: 24.6 t ADT: 44
PARIS RD
FairOver: WAPSIPINICON RIVER
086062901, Linn, IA
Built 1954 Load: 24.6 t ADT: 344
FM
FairOver: ALBERTSON CREEK
0984715, Lyon, IA
Built 1973 Load: 24.6 t ADT: 100
LOCAL
FairOver: DRAINAGE
076293301, Madison, IA
Built 1938 Load: 24.6 t ADT: 29
LOCAL
FairOver: MUD CREEK
078E10408, Muscatine, IA
Built 1967 Load: 24.6 t ADT: 155
VALLEY WEST DRIVE
FairOver: JORDAN CREEK
000000000, Polk, IA
Built 1984 Load: 24.6 t ADT: 11,678
LOCAL
FairOver: FLOYD RIV
096431401, Sioux, IA
Built 1954 Load: 24.6 t ADT: 50
FM
FairOver: OTTER CREEK 2ND CHANNEL
097441201, Sioux, IA
Built 1962 Load: 24.6 t ADT: 619
LOCAL
FairOver: STREAM
086431403, Woodbury, IA
Built 2006 Load: 24.6 t ADT: 50
LOCAL
FairOver: SMALL STREAM
091152803, Butler, IA
Built 1967 Load: 24.7 t ADT: 16
LOCAL
FairOver: STREAM
082360602, Carroll, IA
Built 1999 Load: 24.7 t ADT: 5
545TH ST
FairOver: CLARKS BRANCH
074373104, Cass, IA
Built 2016 Load: 24.7 t ADT: 11
LOCAL
FairOver: JACK CREEK
098320901, Emmet, IA
Built 1973 Load: 24.7 t ADT: 20
LOCAL
FairOver: DD #40
099320601, Emmet, IA
Built 1973 Load: 24.7 t ADT: 10
FM 210TH ST
FairOver: W FORK CEDAR RIVER
093193401, Franklin, IA
Built 1987 Load: 24.7 t ADT: 422
NB I-380
FairOver: IOWA RIVER
7.9 MI. N OF JCT I-80, Johnson, IA
Built 1972 Load: 24.7 t ADT: 27,200
LOCAL
FairOver: HOWERDON CREEK
076292502, Madison, IA
Built 1992 Load: 24.7 t ADT: 11
FM
FairOver: LIZARD CK DD #53
091322301, Pocahontas, IA
Built 1951 Load: 24.7 t ADT: 20
LOCAL
FairOver: BIG CEDAR CREEK
092341101, Pocahontas, IA
Built 1956 Load: 24.7 t ADT: 20
LOCAL
FairOver: BRANCH IOWA RIVER
081140301, Poweshiek, IA
Built 1951 Load: 24.7 t ADT: 50
LOCAL
FairOver: SMALL STREAM
067280105, Ringgold, IA
Built 1990 Load: 24.7 t ADT: 15
LOCAL
FairOver: CREEK
082132703, Tama, IA
Built 1950 Load: 24.7 t ADT: 10
FM
FairOver: BRANCH IOWA RIVER
083141702, Tama, IA
Built 1990 Load: 24.7 t ADT: 98
FM
FairOver: HONEY CREEK
074091707, Washington, IA
Built 1969 Load: 24.7 t ADT: 50
FM
FairOver: CAMP CREEK
077072905, Washington, IA
Built 1968 Load: 24.7 t ADT: 120
MARION AVE
FairOver: STREAM
074310602, Adair, IA
Built 1992 Load: 24.8 t ADT: 26
NAVAHO AVE
FairOver: CRANE CREEK
092121702, Bremer, IA
Built 1994 Load: 24.8 t ADT: 59
MONROE AVE.
FairOver: SIBLES CREEK
082020702, Cedar, IA
Built 2003 Load: 24.8 t ADT: 60
310TH
FairOver: WINNEBAGO RIVER
097222001, Cerro Gordo, IA
Built 1960 Load: 24.8 t ADT: 992
FM
FairOver: BRANCH BEAR CREEK
087183102, Grundy, IA
Built 1966 Load: 24.8 t ADT: 520
FM
FairOver: BEAR CREEK ,BRANCH
087183201, Grundy, IA
Built 1964 Load: 24.8 t ADT: 98
LOCAL
FairOver: SMALL
078330202, Guthrie, IA
Built 1979 Load: 24.8 t ADT: 20
LOCAL
FairOver: SMALL STREAM
078333602, Guthrie, IA
Built 1982 Load: 24.8 t ADT: 11
LOCAL
FairOver: LONE GROVE CREEK
079320504, Guthrie, IA
Built 1983 Load: 24.8 t ADT: 20
LOCAL
FairOver: TRIB. TO TROUBLESOME
079332102, Guthrie, IA
Built 1977 Load: 24.8 t ADT: 5
LOCAL
FairOver: TRIB. TO TROUBLESOME
079332801, Guthrie, IA
Built 1977 Load: 24.8 t ADT: 20
LOCAL
FairOver: HONEY CREEK
087222301, Hardin, IA
Built 1980 Load: 24.8 t ADT: 26
FM 335TH ST
FairOver: BOYER RIVER
078442301, Harrison, IA
Built 1959 Load: 24.8 t ADT: 788
LOCAL
FairOver: ODEBOLT CREEK
087392104, Ida, IA
Built 1981 Load: 24.8 t ADT: 62
LOCAL RD
FairOver: STREAM
076120301, Keokuk, IA
Built 1939 Load: 24.8 t ADT: 15
US 59
FairOver: STREAM
1.5 mi. N of Jct. IA 48, Page, IA
Built 1930 Load: 24.8 t ADT: 1,780
Showing 4,051-4,100 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.