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

LOCAL

Poor

Over: STREAM

067181603, Appanoose, IA

Built 1995 Load: 9.1 t ADT: 51

190TH ST

Poor

Over: STREAM

084282102, Boone, IA

Built 1900 Load: 9.1 t ADT: 20

510TH ST

Poor

Over: WEST FORK LITTLE SIOUX

092422401, Cherokee, IA

Built 1917 Load: 9.1 t ADT: 5

LCL MRT.ACC.RD

Poor

Over: STREAM

093391604, Cherokee, IA

Built 1917 Load: 9.1 t ADT: 11

LOCAL

Poor

Over: SMALL STREAM

072273304, Clarke, IA

Built 1900 Load: 9.1 t ADT: 20

GRANNIS RD.

Poor

Over: GRANNIS CR

093083605, Fayette, IA

Built 1951 Load: 9.1 t ADT: 29

175TH ST

Poor

Over: VOLGA RIVER

093101103, Fayette, IA

Built 1955 Load: 9.1 t ADT: 11

315TH ST

Poor

Over: MOSQUITO CREEK

078412003, Harrison, IA

Built 1930 Load: 9.1 t ADT: 20

LOCAL

Poor

Over: CREEK

084E52805, Jackson, IA

Built 1920 Load: 9.1 t ADT: 79

LOCAL

Poor

Over: CREEK

085E53610, Jackson, IA

Built 1930 Load: 9.1 t ADT: 40

FM SW COSGRV RD

Poor

Over: N BR OLD MAN'S CREEK

079082502, Johnson, IA

Built 1960 Load: 9.1 t ADT: 620

DINGLEBERRY RD

Poor

Over: RAPID CR

080052005, Johnson, IA

Built 1960 Load: 9.1 t ADT: 398

LOCAL

Poor

Over: WOLF CREEK

071222510, Lucas, IA

Built 1967 Load: 9.1 t ADT: 26

LOCAL RD

Poor

Over: CEDAR CREEK

076282802, Madison, IA

Built 1966 Load: 9.1 t ADT: 26

FM

Poor

Over: N COAL CREEK

074170406, Mahaska, IA

Built 1953 Load: 9.1 t ADT: 20

FM

Poor

Over: LOCAL CREEK

071163103, Monroe, IA

Built 1958 Load: 9.1 t ADT: 110

FM

Poor

Over: STREAM

073160306, Monroe, IA

Built 1958 Load: 9.1 t ADT: 25

T AVENUE

Poor

Over: STREAM

069361604, Page, IA

Built 1976 Load: 9.1 t ADT: 50

FM

Poor

Over: OLD CHANNEL DES MOINES R

094310803, Palo Alto, IA

Built 1956 Load: 9.1 t ADT: 46

LOCAL

Poor

Over: STREAM

096331802, Palo Alto, IA

Built 1955 Load: 9.1 t ADT: 60

LOCAL

Poor

Over: DRAINAGE DITCH #29

090333102, Pocahontas, IA

Built 1920 Load: 9.1 t ADT: 26

LOCAL

Poor

Over: STREAM

070312302, Ringgold, IA

Built 1948 Load: 9.1 t ADT: 40

LOCAL

Poor

Over: STREAM

087361204, Sac, IA

Built 1924 Load: 9.1 t ADT: 50

580TH AVE

Poor

Over: LONG DICK CREEK

085231602, Story, IA

Built 1964 Load: 9.1 t ADT: 50

LOCAL

Poor

Over: BR SUGAR CREEK

084160602, Tama, IA

Built 1920 Load: 9.1 t ADT: 29

LOCAL

Poor

Over: HONEY CREEK

069323302, Taylor, IA

Built 1958 Load: 9.1 t ADT: 15

LOCAL

Poor

Over: WEST BRANCH 102

069340604, Taylor, IA

Built 1971 Load: 9.1 t ADT: 11

LOCAL

Poor

Over: CREEK

070111406, Van Buren, IA

Built 1968 Load: 9.1 t ADT: 11

LOCAL ROAD

Poor

Over: SMALL STREAM

077060804, Washington, IA

Built 1966 Load: 9.1 t ADT: 80

LOCAL

Poor

Over: DRAINAGE DITCH

099240301, Winnebago, IA

Built 1976 Load: 9.1 t ADT: 72

135TH AVE

Poor

Over: TWISTER BRANCH

089242901, Winnebago, IA

Built 1999 Load: 9.1 t ADT: 11

LOCAL

Poor

Over: STREAM

0874307, Woodbury, IA

Built 1920 Load: 9.1 t ADT: 60

LOCAL

Poor

Over: CREEK

092232602, Wright, IA

Built 1900 Load: 9.1 t ADT: 47

LOCAL

Poor

Over: EAST FORK CROOKED CREEK

073051104, Henry, IA

Built 1914 Load: 9.2 t ADT: 16

E 64TH ST S

Poor

Over: STREAM

078181806, Jasper, IA

Built 1940 Load: 9.2 t ADT: 5

LOCAL

Poor

Over: EAST BIG CREEK

068283601, Ringgold, IA

Built 1951 Load: 9.2 t ADT: 26

210TH STREET

Poor

Over: WEST PLATTE RIVER

072323503, Adams, IA

Built 1966 Load: 9.3 t ADT: 11

FM 260TH ST

Poor

Over: CRAIN CREEK

091122801, Bremer, IA

Built 1965 Load: 9.3 t ADT: 776

LOCAL

Poor

Over: MIDDLE RACCOON RIVER

083343503, Carroll, IA

Built 1914 Load: 9.3 t ADT: 15

LOCAL

Poor

Over: LOCAL CREEK

073260903, Clarke, IA

Built 1968 Load: 9.3 t ADT: 71

LOCAL

Poor

Over: BURR OAK CR

069122102, Davis, IA

Built 1964 Load: 9.3 t ADT: 26

LOCAL

Poor

Over: MIDDLE RIVER

078332302, Guthrie, IA

Built 1981 Load: 9.3 t ADT: 40

FM

Poor

Over: FROST CREEK

080332302, Guthrie, IA

Built 1959 Load: 9.3 t ADT: 20

LOCAL

Poor

Over: MILLER CREEK

078092402, Iowa, IA

Built 1930 Load: 9.3 t ADT: 30

FM

Poor

Over: BUCKLEY CREEK

077170901, Mahaska, IA

Built 1951 Load: 9.3 t ADT: 70

LOCAL

Poor

Over: DD 80

095321203, Palo Alto, IA

Built 1959 Load: 9.3 t ADT: 50

FM

Poor

Over: SOUTH ENGLISH RIVER

078142002, Poweshiek, IA

Built 1990 Load: 9.3 t ADT: 30

LOCAL

Poor

Over: N ENGLISH RIVER

079160102, Poweshiek, IA

Built 1924 Load: 9.3 t ADT: 15

LOCAL

Poor

Over: SMALL STREAM

089351301, Sac, IA

Built 1924 Load: 9.3 t ADT: 11

LOCAL

Poor

Over: SAND CREEK

071281904, Union, IA

Built 1967 Load: 9.3 t ADT: 41

Showing 17,551-17,600 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.