State profile · Above national median SD

Iowa bridge safety

Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in Iowa — drawn straight from the FHWA National Bridge Inventory.

20,753
Public bridges
36.5%
Good condition
20.0%
Poor condition
20.0%
Structurally deficient

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 rated 0-4

Structurally Deficient

20.0%

4,153 bridges flagged for repair priority

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 — Structurally deficient share 66.7%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.

Condition Distribution

Bridge inventory deck-condition mix — Iowa (FHWA NBI)

Iowa36.534476943092564%38.39444899532597%20.011564593070883%20.011564593070883%GoodFairPoorStructurally Deficient
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 on the structurally deficient leaderboard (lower share = better)

States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below Iowa on the same metric.

54

West Virginia

16.02% top marginal rate
Structure
Progressive
Burden @ $100K
$7,679

46

South Dakota

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

19

Iowa

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

78

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 composite NBI rating. Each is inspected at least every 24 months.

270TH STREET

Structurally Deficient

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

Structurally Deficient

Over: MUD CREEK

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

Built 1948 Load: 2.7 t ADT: 11

LOCAL - 700TH

Structurally Deficient

Over: TRIB TROUBLESOME CREEK

077351402, Cass, IA

Built 1983 Load: 2.7 t ADT: 11

LOCAL - DAYTONA

Structurally Deficient

Over: BUCK CREEK

077361903, Cass, IA

Built 1980 Load: 2.7 t ADT: 35

100TH ST.

Structurally Deficient

Over: UNION CREEK

083E20101, Clinton, IA

Built 1900 Load: 2.7 t ADT: 78

All Bridges in Iowa

IA 31

Good

Over: FOUR MILE CREEK

1.1 mi. S of Jct. SR L51, Cherokee, IA

Built 2015 Load: 32.4 t ADT: 1,350

C66 650TH ST

Good

Over: SILVER CREEK

90403401, Cherokee, IA

Built 2017 Load: 32.4 t ADT: 240

U AVE

Good

Over: SMALL CREEK

091391602, Cherokee, IA

Built 2015 Load: 32.4 t ADT: 30

C44 570TH ST

Good

Over: ROCK CREEK

091412201, Cherokee, IA

Built 2019 Load: 32.4 t ADT: 120

C44 570TH ST

Good

Over: FIDDLE CREEK

091421901, Cherokee, IA

Built 2017 Load: 32.4 t ADT: 139

C44 570TH ST

Good

Over: W FORK LITTLE SIOUX

91422101, Cherokee, IA

Built 2017 Load: 32.4 t ADT: 139

A AVE

Good

Over: WEST FORK LITTLE SIOUX

091423102, Cherokee, IA

Built 2014 Load: 32.4 t ADT: 30

C25 480TH

Good

Over: BRANCH MAPLE RIVER

092390201, Cherokee, IA

Built 2015 Load: 32.4 t ADT: 90

M21 W AVE

Good

Over: BRANCH MAPLE RIVER

092390202, Cherokee, IA

Built 2019 Load: 32.4 t ADT: 190

L40 H AVE

Good

Over: WILLOW CREEK

092412002, Cherokee, IA

Built 2015 Load: 32.4 t ADT: 199

C16 450TH ST

Good

Over: MILL CREEK

093412403, Cherokee, IA

Built 2019 Load: 32.4 t ADT: 319

V62 WINDSOR AVE

Good

Over: SPRING CREEK

94112402, Chickasaw, IA

Built 2014 Load: 32.4 t ADT: 62

CHEYENNE

Good

Over: UNNAMED CREEK

094140906, Chickasaw, IA

Built 2021 Load: 32.4 t ADT: 88

EXETER AVE

Good

Over: CREEK

094141302, Chickasaw, IA

Built 2013 Load: 32.4 t ADT: 98

VANDERBILT

Good

Over: SMALL STREAM

095111402, Chickasaw, IA

Built 2023 Load: 32.4 t ADT: 41

190TH ST

Good

Over: PLUM CREEK

095120201, Chickasaw, IA

Built 2020 Load: 32.4 t ADT: 41

ODESSA AVE

Good

Over: EAST WAPSIPINICON RIVER

095121604, Chickasaw, IA

Built 2023 Load: 32.4 t ADT: 39

B54 240TH ST

Good

Over: E FORK WAPSIPINICON

095123603, Chickasaw, IA

Built 2017 Load: 32.4 t ADT: 511

B57 (220TH ST)

Good

Over: WAPSIPINICON

095131903, Chickasaw, IA

Built 2014 Load: 32.4 t ADT: 786

B33 170TH ST

Good

Over: CREEK

96132501, Chickasaw, IA

Built 2015 Load: 32.4 t ADT: 59

170TH ST

Good

Over: SMALL STREAM

096132801, Chickasaw, IA

Built 2021 Load: 32.4 t ADT: 88

T 76 CHEYENNE

Good

Over: WAPSIPINICON RIVER

096142202, Chickasaw, IA

Built 2019 Load: 32.4 t ADT: 98

EXETER

Good

Over: CREEK

096143602, Chickasaw, IA

Built 2018 Load: 32.4 t ADT: 73

NOLAN

Good

Over: CREEK

097122804, Chickasaw, IA

Built 2020 Load: 32.4 t ADT: 41

V 28 JASPER

Good

Over: BR E FK WAPSIPINICON

097132602, Chickasaw, IA

Built 2018 Load: 32.4 t ADT: 35

BEAUMONT AVE

Good

Over: BRANCH WAPSIPINICON RVR

97142802, Chickasaw, IA

Built 2016 Load: 32.4 t ADT: 47

115TH ST

Good

Over: BRANCH WAPSIPINICON RVR

097142903, Chickasaw, IA

Built 2017 Load: 32.4 t ADT: 29

ADDISON AVE

Good

Over: CREEK

097143102, Chickasaw, IA

Built 2019 Load: 32.4 t ADT: 29

T76 CHEYENNE

Good

Over: UNNAMED STREAM

096140302, Chickasaw, IA

Built 2019 Load: 32.4 t ADT: 255

NB I-35

Good

Over: SOUTH WEST CREEK

0.7 MI. N of IA 152, Clarke, IA

Built 2012 Load: 32.4 t ADT: 9,400

H45 ELK ST

Good

Over: NORTH HOOSIER CREEK

071251005, Clarke, IA

Built 2021 Load: 32.4 t ADT: 79

160TH AVE

Good

Over: BEE CREEK

071260602, Clarke, IA

Built 2018 Load: 32.4 t ADT: 26

H45 ELK ST

Good

Over: BRANCH LONG CREEK

071271703, Clarke, IA

Built 2015 Load: 32.4 t ADT: 40

R15 130TH AVE

Good

Over: WEST LONG CREEK

071272202, Clarke, IA

Built 2021 Load: 32.4 t ADT: 219

R69 330TH AVE

Good

Over: OTTER CREEK

072240204, Clarke, IA

Built 2014 Load: 32.4 t ADT: 120

H20 PACIFIC ST

Good

Over: BRANCH OTTER CREEK

073242203, Clarke, IA

Built 2015 Load: 32.4 t ADT: 71

H28 MEADOW ST

Good

Over: NORTH OTTER CREEK

073253405, Clarke, IA

Built 2021 Load: 32.4 t ADT: 60

MILL ST

Good

Over: TRIB TO BRUSH CREEK

072242602, Clarke, IA

Built 2020 Load: 32.4 t ADT: 372

US 18

Good

Over: OCHEYEDAN RIVER

2.3 mi W of SR M-27, Clay, IA

Built 2014 Load: 32.4 t ADT: 2,990

US 71

Good

Over: PRAIRIE CREEK

1.4 MI. N OF JCT. SR B40, Clay, IA

Built 2017 Load: 32.4 t ADT: 4,770

420TH ST

Good

Over: STREAM

095362201, Clay, IA

Built 2005 Load: 32.4 t ADT: 46

FAWN HOLLOW RD

Good

Over: STREAM

0.5 MI. S OF JCT. IA 128, Clayton, IA

Built 1979 Load: 32.4 t ADT: 10

SEVEN DAY RD

Good

Over: SILVER CREEK(WEST)

082031501, Clinton, IA

Built 2017 Load: 32.4 t ADT: 80

120TH AVENUE

Good

Over: DD #23

083E13204, Clinton, IA

Built 2002 Load: 32.4 t ADT: 51

28TH AVE NORTH

Good

Over: TURTLE CREEK

082071902, Clinton, IA

Built 2019 Load: 32.4 t ADT: 109

E46 200TH ST

Good

Over: PARADISE CREEK

083401507, Crawford, IA

Built 2017 Load: 32.4 t ADT: 21

120TH ST

Good

Over: EAST SOLDIER RIVER

084412804, Crawford, IA

Built 2016 Load: 32.4 t ADT: 30

UTE AVENUE

Good

Over: JOHNSON CREEK

078261704, Dallas, IA

Built 2013 Load: 32.4 t ADT: 2,071

156TH ST SB

Good

Over: WALNUT CREEK

200 ft North of Brookview, Dallas, IA

Built 2015 Load: 32.4 t ADT: 222

SPORTSMAN CLUB RD

Good

Over: CREEK

079271804, Dallas, IA

Built 2014 Load: 32.4 t ADT: 51

Showing 10,501-10,550 of 20,753 bridges

Related

All states → | National rankings → | Understanding conditions → | SD bridges explained →
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges Editorial.

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). A "structurally deficient" rating is a repair-priority signal, not a closure or unsafe-to-cross designation. Consult a qualified civil engineer before making decisions based on this data.

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.