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
FM
PoorOver: CEDAR CREEK
087311704, Calhoun, IA
Built 1972 Load: 30.4 t ADT: 60
FM
PoorOver: LITTLE CEDAR
095140904, Chickasaw, IA
Built 1965 Load: 30.4 t ADT: 196
FM
PoorOver: DUGOUT CREEK
099381002, Dickinson, IA
Built 1970 Load: 30.4 t ADT: 843
FM
PoorOver: BEAVER CREEK
095182202, Floyd, IA
Built 1965 Load: 30.4 t ADT: 206
FM
PoorOver: SOUTH RACCOON RIVER
078301203, Guthrie, IA
Built 1975 Load: 30.4 t ADT: 329
FM 1870 330TH
PoorOver: WINNEBAGO RIVER
097241203, Hancock, IA
Built 1963 Load: 30.4 t ADT: 2,192
LOCAL
PoorOver: SOUTH FORK IOWA RIVER
088212906, Hardin, IA
Built 1939 Load: 30.4 t ADT: 39
FM
PoorOver: SOUTH FORK IOWA RIVER
088213403, Hardin, IA
Built 1964 Load: 30.4 t ADT: 373
HIGHWAY S-74 S
PoorOver: CARSON CREEK
078190303, Jasper, IA
Built 1964 Load: 30.4 t ADT: 810
FM
PoorOver: BR OF ENGLISH CREEK
073211102, Lucas, IA
Built 1963 Load: 30.4 t ADT: 880
FM
PoorOver: RAT CREEK
098432202, Lyon, IA
Built 1966 Load: 30.4 t ADT: 199
FM
PoorOver: LITTLE OTTER CREEK
098433402, Lyon, IA
Built 1968 Load: 30.4 t ADT: 199
FM
PoorOver: KLONDIKE CREEK
099481502, Lyon, IA
Built 1966 Load: 30.4 t ADT: 309
FM
PoorOver: MUD CREEK
100471301, Lyon, IA
Built 1970 Load: 30.4 t ADT: 290
FM
PoorOver: JIM CREEK
077290306, Madison, IA
Built 1972 Load: 30.4 t ADT: 597
OLD IA 102
PoorOver: BUCKLEY CREEK
077172703, Mahaska, IA
Built 1967 Load: 30.4 t ADT: 2,340
FM
PoorOver: ROCK CREEK
084172813, Marshall, IA
Built 1965 Load: 30.4 t ADT: 2,838
FM
PoorOver: LITTLE FLOYD RIVER
096420802, O'Brien, IA
Built 1968 Load: 30.4 t ADT: 50
FM
PoorOver: DD # 77 NO LIZARD CK
091310502, Pocahontas, IA
Built 1973 Load: 30.4 t ADT: 698
FM
PoorOver: BEAVER CREEK
093321301, Pocahontas, IA
Built 1973 Load: 30.4 t ADT: 369
FM
PoorOver: DRAINAGE
075380404, Pottawattamie, IA
Built 1964 Load: 30.4 t ADT: 270
FM
PoorOver: BOYER RIVER
0893722, Sac, IA
Built 1964 Load: 30.4 t ADT: 249
240TH AVE
PoorOver: CREEK
079E50702, Scott, IA
Built 1967 Load: 30.4 t ADT: 2,180
FM
PoorOver: BRANCH SALT CREEK
083132004, Tama, IA
Built 1970 Load: 30.4 t ADT: 432
FM
PoorOver: SO BRANCH SALT CREEK
084133202, Tama, IA
Built 1969 Load: 30.4 t ADT: 363
FM
PoorOver: VILLAGE CREEK
071130904, Wapello, IA
Built 1968 Load: 30.4 t ADT: 250
LOCAL
PoorOver: MIDDLE AVERY CREEK
073153306, Wapello, IA
Built 1968 Load: 30.4 t ADT: 62
FM
PoorOver: WOLF CREEK
087442103, Woodbury, IA
Built 1968 Load: 30.4 t ADT: 71
FM
PoorOver: MUD CREEK
089440701, Woodbury, IA
Built 1969 Load: 30.4 t ADT: 709
FM
PoorOver: WHISKEY CREEK
089461201, Woodbury, IA
Built 1967 Load: 30.4 t ADT: 628
FISH POND RD
PoorOver: CREEK
088010304, Dubuque, IA
Built 1997 Load: 30.5 t ADT: 128
FM
PoorOver: LITTLE CEDAR
096151603, Floyd, IA
Built 1967 Load: 30.5 t ADT: 167
FM
PoorOver: LITTLE CEDAR CREEK
070072603, Henry, IA
Built 1972 Load: 30.5 t ADT: 650
LOCAL
PoorOver: SPRING BRANCH
086E22903, Jackson, IA
Built 1993 Load: 30.5 t ADT: 40
LOCAL
PoorOver: BR OF CARRUTHERS CREEK
073200301, Lucas, IA
Built 1900 Load: 30.5 t ADT: 11
FM
PoorOver: MOSQUITO CK
078022804, Muscatine, IA
Built 1978 Load: 30.5 t ADT: 1,260
LOCAL (LWC)
PoorOver: STREAM
083112902, Benton, IA
Built 1977 Load: 30.6 t ADT: 34
MARQUIS RD
PoorOver: SHELL ROCK RIV OVERFLOW
90-14-04-07-10, Black Hawk, IA
Built 1992 Load: 30.6 t ADT: 207
FM
PoorOver: MC CLURE CREEK
091150802, Butler, IA
Built 1970 Load: 30.6 t ADT: 470
FM
PoorOver: SMALL STREAM
091171702, Butler, IA
Built 1970 Load: 30.6 t ADT: 373
CAMP COMFORT
PoorOver: SMALL STREAM
093161906, Butler, IA
Built 1936 Load: 30.6 t ADT: 42
FM-530TH ST
PoorOver: W FORK LITTLE SIOUX
092423501, Cherokee, IA
Built 1968 Load: 30.6 t ADT: 898
LOCAL
PoorOver: CHARITON CR
071242804, Clarke, IA
Built 1986 Load: 30.6 t ADT: 20
FM
PoorOver: OTTER CREEK
073242002, Clarke, IA
Built 1969 Load: 30.6 t ADT: 319
LOCAL
PoorOver: CREEK
094151302, Floyd, IA
Built 1970 Load: 30.6 t ADT: 39
LOCAL ROAD
PoorOver: BRANCH OF WOLF CREEK
086172901, Grundy, IA
Built 1976 Load: 30.6 t ADT: 11
FM
PoorOver: BEAVER CREEK
088203403, Hardin, IA
Built 1967 Load: 30.6 t ADT: 334
FM
PoorOver: SILVER CREEK
088391702, Ida, IA
Built 1969 Load: 30.6 t ADT: 589
FM
PoorOver: BATTLE CREEK
088412504, Ida, IA
Built 1969 Load: 30.6 t ADT: 499
FM
PoorOver: ENGLISH CREEK
075180406, Marion, IA
Built 1975 Load: 30.6 t ADT: 2,640
Showing 20,301-20,350 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.