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
PoorOver: BR LITTLE SIOUX RIVER
093371802, Buena Vista, IA
Built 1971 ADT: 30
LOCAL
PoorOver: STREAM
093373201, Buena Vista, IA
Built 1973 ADT: 5
FM
PoorOver: BR LITTLE SIOUX RIVER
093381005, Buena Vista, IA
Built 1960 ADT: 26
FM
PoorOver: OVFLW W FORK CEDAR RIVER
090150504, Butler, IA
Built 1953 ADT: 874
LOCAL
PoorOver: BEAVER CREEK
090181402, Butler, IA
Built 1910 ADT: 21
LOCAL
PoorOver: SMALL STREAM
092181403, Butler, IA
Built 1951 ADT: 21
QUAIL AVE
PoorOver: FLOOD CREEK
093162604, Butler, IA
Built 1910 ADT: 26
BLUE BIRD DR.
PoorOver: COLD WATER CREEK
093171304, Butler, IA
Built 1905 ADT: 5
LOCAL
PoorOver: D.D. NO.198
086340101, Calhoun, IA
Built 1900 ADT: 20
LOCAL
PoorOver: DD. NO 31
087310601, Calhoun, IA
Built 1971 ADT: 15
LOCAL
PoorOver: SOUTH BRANCH LIZARD
089310301, Calhoun, IA
Built 1957 ADT: 20
LOCAL
PoorOver: BIG CEDAR CR DD 181
089340401, Calhoun, IA
Built 1900 ADT: 15
LOCAL - 680TH
PoorOver: W NODAWAY RIVER
074351604, Cass, IA
Built 1970 ADT: 62
LOCAL - WICHITA
PoorOver: THREE MILE CREEK
074362603, Cass, IA
Built 1972 ADT: 30
LOCAL - 620TH
PoorOver: WATERWAY
074363302, Cass, IA
Built 1977 ADT: 15
LOCAL - 740TH
PoorOver: WATERWAY
075341602, Cass, IA
Built 1985 ADT: 11
LOCAL - QUINCY
PoorOver: WEST NODAWAY RIVER
075342603, Cass, IA
Built 1982 ADT: 41
FM - 710TH
PoorOver: WATERWAY
076351302, Cass, IA
Built 1955 ADT: 26
LOCAL - 675TH
PoorOver: CREEK
076351704, Cass, IA
Built 1961 ADT: 5
FM - 660TH
PoorOver: JIM CREEK
076351902, Cass, IA
Built 1956 ADT: 34
LOCAL
PoorOver: WATERWAY
076371901, Cass, IA
Built 1955 ADT: 26
LOCAL/EASTLAND
PoorOver: BUCK CREEK
077363001, Cass, IA
Built 1974 ADT: 26
LOCAL/BUCK CRK
PoorOver: EAST NISHNABOTNA RIVER
077363206, Cass, IA
Built 1900 ADT: 123
LOCAL/FAIRVIEW
PoorOver: CREEK
077373601, Cass, IA
Built 1959 ADT: 21
ROSE AVE
PoorOver: SMALL
080021302, Cedar, IA
Built 1979 ADT: 15
270TH ST
PoorOver: CROOKED CR
080023203, Cedar, IA
Built 1930 ADT: 20
LOCAL-640TH ST
PoorOver: MAPLE RIVER
090392801, Cherokee, IA
Built 1954 ADT: 11
Q AVE
PoorOver: BR SILVER CR
090401104, Cherokee, IA
Built 1919 ADT: 11
LOCAL- 630TH ST
PoorOver: WILLOW CREEK
090411901, Cherokee, IA
Built 1917 ADT: 15
LOCAL 540TH ST.
PoorOver: PERRY CREEK
091400501, Cherokee, IA
Built 1982 ADT: 26
LOCAL 550TH ST.
PoorOver: WILLOW CREEK
091410701, Cherokee, IA
Built 1918 ADT: 34
FM J AVE.
PoorOver: ROCK CREEK
091412202, Cherokee, IA
Built 1938 ADT: 11
LOCAL 540TH ST
PoorOver: FIDDLE CREEK
091420501, Cherokee, IA
Built 1900 ADT: 11
LOCAL 440TH ST
PoorOver: CREEK
093411205, Cherokee, IA
Built 1900 ADT: 15
FM J AVE
PoorOver: BEAR CREEK
093411502, Cherokee, IA
Built 1940 ADT: 538
570TH ST
PoorOver: PITCHER 153
091392001, Cherokee, IA
Built 1900 ADT: 11
LOCAL
PoorOver: PLUM CREEK
095120301, Chickasaw, IA
Built 1962 ADT: 62
LOCAL
PoorOver: PLUM CREEK
095121101, Chickasaw, IA
Built 1948 ADT: 16
LOCAL
PoorOver: CRANE CREEK RIVER
096113208, Chickasaw, IA
Built 1951 ADT: 16
LOCAL
PoorOver: LITTLE WAPSIPINICON RVR
096131803, Chickasaw, IA
Built 1952 ADT: 30
LOCAL
PoorOver: WAPSIPINICON RIVER
097142001, Chickasaw, IA
Built 1957 ADT: 21
LOCAL
PoorOver: CHARITON CR
071242406, Clarke, IA
Built 1960 ADT: 15
LOCAL
PoorOver: BR WHITE BREAST CREEK
071251404, Clarke, IA
Built 1969 ADT: 5
LOCAL
PoorOver: WHITE BREAST CREEK
072253503, Clarke, IA
Built 1969 ADT: 11
FM
PoorOver: SOUTH WEST CREEK
072261503, Clarke, IA
Built 1960 ADT: 141
FM
PoorOver: WHITE BREAST CREEK
072262605, Clarke, IA
Built 1975 ADT: 45
LOCAL
PoorOver: CREEK
073240603, Clarke, IA
Built 1954 ADT: 40
FM
PoorOver: OTTER CREEK
073241703, Clarke, IA
Built 1968 ADT: 60
LEG NOT OPEN
PoorOver: SMALL
073260203, Clarke, IA
Built 1975 ADT: 11
LOCAL
PoorOver: SOUTH RIVER
073260508, Clarke, IA
Built 1900 ADT: 11
Showing 16,651-16,700 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.