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: GOOSEBERRY CREEK
069290901, Ringgold, IA
Built 1956 ADT: 5
200TH ST
PoorOver: GOOSEBERRY CREEK
069292701, Ringgold, IA
Built 1940 ADT: 20
FM
PoorOver: E FK GRAND RIVER
069293505, Ringgold, IA
Built 1958 ADT: 15
LOCAL
PoorOver: STREAM
069301201, Ringgold, IA
Built 1930 ADT: 15
LOCAL
PoorOver: STREAM
069301302, Ringgold, IA
Built 1952 ADT: 5
190TH ST
PoorOver: CROOKED CREEK
069302301, Ringgold, IA
Built 1942 ADT: 29
LOCAL
PoorOver: STREAM
069311704, Ringgold, IA
Built 1956 ADT: 5
FM
PoorOver: TURKEY CREEK
069312001, Ringgold, IA
Built 1964 ADT: 26
FM
PoorOver: WOLF CREEK
069312401, Ringgold, IA
Built 1957 ADT: 34
FM
PoorOver: STREAM
070283601, Ringgold, IA
Built 1968 ADT: 349
FM
PoorOver: E FK GRAND RIVER
070290101, Ringgold, IA
Built 1960 ADT: 29
LOCAL
PoorOver: STREAM
070290602, Ringgold, IA
Built 1954 ADT: 5
LOCAL
PoorOver: STREAM
070291501, Ringgold, IA
Built 1943 ADT: 11
LOCAL
PoorOver: STREAM
070311101, Ringgold, IA
Built 1960 ADT: 20
LOCAL
PoorOver: STREAM
070312902, Ringgold, IA
Built 1950 ADT: 5
LOCAL
PoorOver: SMALL STREAM
086372303, Sac, IA
Built 1952 ADT: 15
LOCAL ROAD
PoorOver: DRAINAGE
086382501, Sac, IA
Built 1964 ADT: 30
LOCAL
PoorOver: SMALL STREAM
086383201, Sac, IA
Built 1986 ADT: 26
FM
PoorOver: RACCOON RIVER
087353504, Sac, IA
Built 1921 ADT: 45
LOCAL
PoorOver: STREAM
088372102, Sac, IA
Built 1956 ADT: 20
LOCAL
PoorOver: INDIAN CREEK
088373601, Sac, IA
Built 1962 ADT: 34
LOCAL
PoorOver: SMALL STREAM
088381802, Sac, IA
Built 1951 ADT: 20
LOCAL
PoorOver: STREAM
089352202, Sac, IA
Built 1966 ADT: 11
LOCAL
PoorOver: STREAM
089370602, Sac, IA
Built 1962 ADT: 20
85TH AVE
PoorOver: CREEK
079E20906, Scott, IA
Built 1974 ADT: 102
LOCAL
PoorOver: INDIAN CREEK
079373504, Shelby, IA
Built 1926 ADT: 35
LOCAL
PoorOver: KEG CREEK
079401303, Shelby, IA
Built 1966 ADT: 11
LOCAL
PoorOver: SM STREAM
095461701, Sioux, IA
Built 1943 ADT: 5
675TH AVE
PoorOver: ROCK CREEK
082221304, Story, IA
Built 1911 ADT: 20
325TH ST
PoorOver: SMALL STREAM
082222605, Story, IA
Built 1905 ADT: 34
597TH AVE
PoorOver: SMALL STREAM
082232206, Story, IA
Built 1974 ADT: 30
248TH ST
PoorOver: EAST BR INDIAN CREEK
083221403, Story, IA
Built 1936 ADT: 40
LOCAL-DEAD END
PoorOver: SKUNK RIVER
083242405, Story, IA
Built 1876 ADT: 11
190TH ST
PoorOver: SQUAW CREEK
084242001, Story, IA
Built 1900 ADT: 120
FM
PoorOver: SALT CREEK
082132503, Tama, IA
Built 1920 ADT: 157
FM
PoorOver: IOWA RIVER
082141303, Tama, IA
Built 1914 ADT: 39
LOCAL
PoorOver: RICHLAND CREEK
082142302, Tama, IA
Built 1960 ADT: 44
LOCAL
PoorOver: NORTH WALNUT CREEK
082143304, Tama, IA
Built 1915 ADT: 33
LOCAL
PoorOver: SALT CREEK
083130303, Tama, IA
Built 1955 ADT: 44
LOCAL
PoorOver: SALT CREEK
083130303, Tama, IA
Built 1897 ADT: 44
IRR LOCAL
PoorOver: IOWA RIVER OVERFLOW
083161504, Tama, IA
Built 1947 ADT: 216
IRR-LOCAL
PoorOver: IOWA RIVER OVERFLOW
083162204, Tama, IA
Built 1953 ADT: 216
IRR-LOCAL
PoorOver: IOWA RIVER
083162204, Tama, IA
Built 1938 ADT: 216
LOCAL
PoorOver: SOUTH BRANCH SALT CREEK
084132804, Tama, IA
Built 1907 ADT: 26
FM
PoorOver: BRANCH IOWA RIVER
084160302, Tama, IA
Built 1969 ADT: 579
LOCAL
PoorOver: SALT CREEK
085142802, Tama, IA
Built 2001 ADT: 5
LOCAL
PoorOver: HONEY CREEK
067331701, Taylor, IA
Built 1954 ADT: 11
LOCAL
PoorOver: HONEY CREEK
067331901, Taylor, IA
Built 1962 ADT: 15
FM
PoorOver: HONEY CREEK
067332003, Taylor, IA
Built 1940 ADT: 20
LOCAL
PoorOver: EAST 102 RIVER
067341707, Taylor, IA
Built 1967 ADT: 15
Showing 17,001-17,050 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.