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: STREAM
069170801, Appanoose, IA
Built 1952 Load: 25.4 t ADT: 135
FM
PoorOver: ROCK CREEK
081033503, Cedar, IA
Built 1959 Load: 25.4 t ADT: 1,350
275TH
PoorOver: WILLOW CREEK
096210603, Cerro Gordo, IA
Built 1941 Load: 25.4 t ADT: 91
YARD G ROAD
PoorOver: LONG CREEK
APPROX. 4000' S. OF RD. I, Des Moines, IA
Built 1910 Load: 25.4 t ADT: 10
LOCAL ROAD
PoorOver: MIDDLE FORK OF BEAVER CR
089182802, Grundy, IA
Built 1976 Load: 25.4 t ADT: 20
LOCAL
PoorOver: STREAM
078140301, Poweshiek, IA
Built 1964 Load: 25.4 t ADT: 11
LOCAL
PoorOver: N FORK LONG CR
075070103, Washington, IA
Built 1973 Load: 25.4 t ADT: 60
LOCAL ROAD
PoorOver: WHISKEY CREEK
076063202, Washington, IA
Built 1969 Load: 25.4 t ADT: 71
FM
PoorOver: BRUSHY FORK CREEK
083350804, Carroll, IA
Built 1964 Load: 25.5 t ADT: 650
LOCAL ROAD
PoorOver: BLACK HAWK CREEK
087151403, Grundy, IA
Built 1979 Load: 25.5 t ADT: 20
LOCAL
PoorOver: BR BEAVER CREEK
089171401, Grundy, IA
Built 1978 Load: 25.5 t ADT: 44
LOCAL
PoorOver: S. RACCOON RIVER
079311706, Guthrie, IA
Built 1959 Load: 25.5 t ADT: 20
FM 2030 VAIL
PoorOver: GOLLS CREEK
095231002, Hancock, IA
Built 1969 Load: 25.5 t ADT: 259
LOCAL
PoorOver: CREEK
084173502, Marshall, IA
Built 1944 Load: 25.5 t ADT: 73
LOCAL
PoorOver: DD #13
090332504, Pocahontas, IA
Built 1971 Load: 25.5 t ADT: 60
LOCAL
PoorOver: EAST BRANCH SALT CREEK
084132703, Tama, IA
Built 1987 Load: 25.5 t ADT: 26
LOCAL
PoorOver: RUTT BRANCH
075331202, Adair, IA
Built 1960 Load: 25.6 t ADT: 62
LOCAL
PoorOver: N CHEQUEST LAKE CR
069120206, Davis, IA
Built 1958 Load: 25.6 t ADT: 161
LOCAL
PoorOver: SMALL STREAM
070150403, Davis, IA
Built 1940 Load: 25.6 t ADT: 34
LOC 333 AVE
PoorOver: STREAM
087032404, Delaware, IA
Built 1975 Load: 25.6 t ADT: 29
FM
PoorOver: CREEK
088223202, Hardin, IA
Built 1970 Load: 25.6 t ADT: 177
LOCAL
PoorOver: WEST FORK BATTLE CREEK
088412603, Ida, IA
Built 1963 Load: 25.6 t ADT: 5
LOCAL
PoorOver: SMALL CREEK
078143501, Poweshiek, IA
Built 1985 Load: 25.6 t ADT: 50
LOCAL
PoorOver: LITTLE LICK CREEK
070092903, Van Buren, IA
Built 1972 Load: 25.6 t ADT: 47
LOCAL
PoorOver: VILLAGE CR
071150104, Wapello, IA
Built 1973 Load: 25.6 t ADT: 70
FM - 690TH
PoorOver: NODAWAY RIVER
074351502, Cass, IA
Built 1970 Load: 25.7 t ADT: 190
FM - 690TH
PoorOver: WATERWAY
076350304, Cass, IA
Built 1963 Load: 25.7 t ADT: 450
SPICER AVE
PoorOver: STREAM
080010702, Cedar, IA
Built 1915 Load: 25.7 t ADT: 20
APPLE RD.
PoorOver: SMALL CREEK
095073503, Fayette, IA
Built 1968 Load: 25.7 t ADT: 403
LOCAL
PoorOver: WOLF CREEK
086180201, Grundy, IA
Built 1978 Load: 25.7 t ADT: 49
FM
PoorOver: S COPPER CREEK
084E52804, Jackson, IA
Built 1974 Load: 25.7 t ADT: 1,070
LOCAL
PoorOver: BYERS BRANCH CREEK
081213002, Jasper, IA
Built 1947 Load: 25.7 t
FM
PoorOver: SMALL STREAM
076051101, Louisa, IA
Built 1969 Load: 25.7 t ADT: 840
LOCAL ROAD
PoorOver: ALBERTSON CREEK
098471601, Lyon, IA
Built 1900 Load: 25.7 t ADT: 41
FM
PoorOver: N TIMBER CREEK
083192002, Marshall, IA
Built 1963 Load: 25.7 t ADT: 903
LOCAL
PoorOver: SMALL STREAM
080160602, Poweshiek, IA
Built 1978 Load: 25.7 t ADT: 71
WELLS FERRY RD
PoorOver: CREEK
078E50606, Scott, IA
Built 1964 Load: 25.7 t ADT: 1,010
LOCAL
PoorOver: BR STEIN CK
084123001, Benton, IA
Built 1971 Load: 25.8 t ADT: 5
LOCAL
PoorOver: TURKEY CREEK
077342906, Cass, IA
Built 1981 Load: 25.8 t ADT: 21
222ND ST
PoorOver: WEST BEAVER CREEK
083290303, Greene, IA
Built 1921 Load: 25.8 t ADT: 300
LOCAL RD
PoorOver: SOUTH FORK BEAVER CREEK
088180903, Grundy, IA
Built 1977 Load: 25.8 t ADT: 39
LOCAL
PoorOver: BRANCH S TIMBER CREEK
082180801, Marshall, IA
Built 1951 Load: 25.8 t ADT: 15
LOCAL
PoorOver: DRAINAGE DITCH
098250601, Winnebago, IA
Built 1950 Load: 25.8 t ADT: 35
LOCAL ROAD
PoorOver: CREEK
099091007, Winneshiek, IA
Built 1900 Load: 25.8 t ADT: 108
LOCAL
PoorOver: SPRING CREEK
094112301, Chickasaw, IA
Built 1991 Load: 25.9 t ADT: 47
MESQUITE RD
PoorOver: PECK CREEK
091030103, Clayton, IA
Built 1913 Load: 25.9 t ADT: 113
BIXBY RD
PoorOver: NAGLE CREEK
092060906, Clayton, IA
Built 1960 Load: 25.9 t ADT: 62
LOCAL
PoorOver: FABIUS CREEK
067150505, Davis, IA
Built 1977 Load: 25.9 t ADT: 5
EDGE RD.
PoorOver: BELL CR
094070804, Fayette, IA
Built 1954 Load: 25.9 t ADT: 20
180TH ST
PoorOver: TURKEY RIVER
097110501, Howard, IA
Built 1986 Load: 25.9 t ADT: 30
Showing 19,951-20,000 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.