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

Total Bridges

20,753

Public highway bridges in Iowa

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

Iowa38.5%40.4%21.1%GoodFairPoor
Bridge inventory deck-condition mix - Iowa (FHWA NBI)

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
Structure
Progressive
Burden @ $100K
$7,679

SD

South Dakota

16.24% top marginal rate
Structure
Progressive
Burden @ $100K
$5,905
Selected

IA

Iowa

20.01% top marginal rate
Structure
Progressive
Burden @ $100K
$20,753

VI

Virgin Islands

29.17% top marginal rate
Structure
Progressive
Burden @ $100K
$24

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

Poor

Over: ROSE BRANCH

071343401, Adams, IA

Built 1976 Load: 2.7 t ADT: 79

LOCAL

Poor

Over: CREEK

078342601, Audubon, IA

Built 1935 Load: 2.7 t ADT: 21

KLINE RD

Poor

Over: MUD CREEK

87-12-15-02-10, Black Hawk, IA

Built 1948 Load: 2.7 t ADT: 11

LOCAL - 700TH

Poor

Over: TRIB TROUBLESOME CREEK

077351402, Cass, IA

Built 1983 Load: 2.7 t ADT: 11

LOCAL - DAYTONA

Poor

Over: BUCK CREEK

077361903, Cass, IA

Built 1980 Load: 2.7 t ADT: 35

100TH ST.

Poor

Over: UNION CREEK

083E20101, Clinton, IA

Built 1900 Load: 2.7 t ADT: 78

All Bridges in Iowa

FM

Poor

Over: SHORT CREEK

070263206, Decatur, IA

Built 1929 Load: 12.1 t ADT: 15

320TH ST

Poor

Over: ROCK CREEK

067402604, Fremont, IA

Built 1962 Load: 12.1 t ADT: 15

LOC CANAL ST

Poor

Over: WILLOW RIVER

078442103, Harrison, IA

Built 1916 Load: 12.1 t ADT: 100

302ND STREET

Poor

Over: WEST MILL CREEK

067382405, Page, IA

Built 1930 Load: 12.1 t ADT: 15

LOCAL

Poor

Over: STREAM

078150502, Poweshiek, IA

Built 1957 Load: 12.1 t ADT: 30

LOCAL

Poor

Over: STREAM

079153202, Poweshiek, IA

Built 1965 Load: 12.1 t ADT: 26

LOCAL

Poor

Over: NORTH ENGLISH RIVER

079161201, Poweshiek, IA

Built 1983 Load: 12.1 t ADT: 30

LOCAL ROAD

Poor

Over: CREEK

100092403, Winneshiek, IA

Built 1900 Load: 12.1 t ADT: 39

LOCAL/FAIRVIEW

Poor

Over: STREAM

077373603, Cass, IA

Built 1979 Load: 12.2 t ADT: 15

FM

Poor

Over: WALNUT CREEK

073250408, Clarke, IA

Built 1976 Load: 12.2 t ADT: 459

LOCAL

Poor

Over: PANTHER CREEK

079282201, Dallas, IA

Built 1930 Load: 12.2 t ADT: 60

LOCAL

Poor

Over: KILGORE CREEK

068252607, Decatur, IA

Built 1982 Load: 12.2 t ADT: 21

LOCAL

Poor

Over: LITTLE RIVER

068252905, Decatur, IA

Built 1980 Load: 12.2 t ADT: 30

LOCAL

Poor

Over: STREAM

080311902, Guthrie, IA

Built 1959 Load: 12.2 t ADT: 29

LOCAL

Poor

Over: BRANCH DEVIL'S RUN

079112802, Iowa, IA

Built 1963 Load: 12.2 t ADT: 26

265TH AVE

Poor

Over: CREEK

068052604, Lee, IA

Built 1934 Load: 12.2 t ADT: 90

LOCAL

Poor

Over: OTTER CREEK

073031102, Louisa, IA

Built 1920 Load: 12.2 t ADT: 30

LOCAL

Poor

Over: TRIB MAPLE RIVER

084430102, Monona, IA

Built 1900 Load: 12.2 t ADT: 20

LOCAL

Poor

Over: OCHEYEDAN RIVER

100412501, Osceola, IA

Built 1900 Load: 12.2 t ADT: 26

D AVENUE

Poor

Over: NISHNABOTNA RIVER

070392302, Page, IA

Built 1949 Load: 12.2 t ADT: 477

280TH ST

Poor

Over: DRY BRANCH

090440401, Plymouth, IA

Built 1900 Load: 12.2 t ADT: 11

310TH ST

Poor

Over: CREEK

090442001, Plymouth, IA

Built 1900 Load: 12.2 t ADT: 30

280TH ST

Poor

Over: SKUNK RIVER

082230501, Story, IA

Built 1929 Load: 12.2 t ADT: 60

LOCAL

Poor

Over: HONEY CR

069322202, Taylor, IA

Built 1965 Load: 12.2 t ADT: 29

LOCAL

Poor

Over: CREEK

070321804, Taylor, IA

Built 1959 Load: 12.2 t ADT: 5

LOCAL

Poor

Over: DRAINAGE DITCH

100231602, Winnebago, IA

Built 1966 Load: 12.2 t ADT: 41

CATTLE CREEK RD

Poor

Over: CREEK

099101201, Winneshiek, IA

Built 1900 Load: 12.2 t ADT: 20

LOCAL

Poor

Over: BR RACCOON RIVER

092362902, Buena Vista, IA

Built 1930 Load: 12.3 t ADT: 30

GLACIER RD

Poor

Over: STREAM

091041704, Clayton, IA

Built 1925 Load: 12.3 t ADT: 79

180TH ST

Poor

Over: WILLOW CREEK

080431405, Harrison, IA

Built 1975 Load: 12.3 t ADT: 15

E 116TH ST S

Poor

Over: SMALL STREAM

079172902, Jasper, IA

Built 1926 Load: 12.3 t ADT: 16

S 12TH AVE W

Poor

Over: SMALL STREAM

079210601, Jasper, IA

Built 1926 Load: 12.3 t ADT: 150

LOCAL

Poor

Over: BR NORTH CEDAR CREEK

072201001, Lucas, IA

Built 1951 Load: 12.3 t ADT: 26

LOCAL

Poor

Over: CLEAR CREEK

083203101, Marshall, IA

Built 1941 Load: 12.3 t ADT: 26

LOCAL

Poor

Over: WILDCAT CREEK

069101905, Van Buren, IA

Built 1951 Load: 12.3 t ADT: 30

FM

Poor

Over: WEST FORK LITTLE SIOUX

089441001, Woodbury, IA

Built 1960 Load: 12.3 t ADT: 509

LOCAL

Poor

Over: BIG CREEK

082252701, Boone, IA

Built 1917 Load: 12.4 t ADT: 30

LOCAL

Poor

Over: CREEK

091382801, Buena Vista, IA

Built 1976 Load: 12.4 t ADT: 45

FM-PADDOCK RD

Poor

Over: LOCAL CREEK

071432103, Mills, IA

Built 1970 Load: 12.4 t ADT: 71

LOCAL

Poor

Over: CREEK

071193204, Monroe, IA

Built 1959 Load: 12.4 t ADT: 40

SEC RD

Poor

Over: WATERMAN CR

094390303, O'Brien, IA

Built 1915 Load: 12.4 t

FM

Poor

Over: CLOVERDALE CREEK

099412902, Osceola, IA

Built 1958 Load: 12.4 t ADT: 459

FM

Poor

Over: STREAM

078132801, Poweshiek, IA

Built 1969 Load: 12.4 t ADT: 25

LOCAL

Poor

Over: LITTLE BEAR CREEK

080143004, Poweshiek, IA

Built 1952 Load: 12.4 t ADT: 20

LOCAL

Poor

Over: NO NAME CREEK

086370602, Sac, IA

Built 1926 Load: 12.4 t ADT: 34

LOCAL

Poor

Over: SMALL STREAM

089370501, Sac, IA

Built 1916 Load: 12.4 t ADT: 11

POPLAR AVENUE

Poor

Over: WILLOW CREEK

071332304, Adams, IA

Built 1981 Load: 12.5 t ADT: 11

LOCAL

Poor

Over: BR RACCOON RIVER

091361702, Buena Vista, IA

Built 1977 Load: 12.5 t ADT: 15

LOCAL - 660TH

Poor

Over: STREAM

074353104, Cass, IA

Built 1981 Load: 12.5 t ADT: 5

INDIAN AVE

Poor

Over: W ROCK CR

081030402, Cedar, IA

Built 1918 Load: 12.5 t ADT: 11

Showing 17,901-17,950 of 20,753 bridges

Related

All states → | National rankings → | Understanding conditions → | Retired SD term explained →
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.