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

US 30 WB

Good

Over: IOWA RIVER

0.9 MI. E OF W JCT SR T47, Tama, IA

Built 2002 Load: 41.0 t ADT: 5,850

W38 GINKO AVE

Good

Over: CROOKED CREEK

076083002, Washington, IA

Built 2000 Load: 41.0 t ADT: 430

LOCAL

Good

Over: EAST FORK CROOKED CREEK

074062901, Washington, IA

Built 2004 Load: 41.0 t ADT: 80

290TH ST

Good

Over: BRUSHY CREEK

087271001, Webster, IA

Built 2000 Load: 41.0 t ADT: 409

FM

Good

Over: BR YELLOW RIVER

096050603, Allamakee, IA

Built 2001 Load: 41.1 t ADT: 98

ENGLISH BENCH ROAD

Good

Over: BR UPPER IOWA RIVER

100053213, Allamakee, IA

Built 2020 Load: 41.1 t ADT: 39

SOUTH ROAD

Good

Over: CLEAR CREEK

097051904, Allamakee, IA

Built 2017 Load: 41.1 t ADT: 121

V66 22ND AVE

Good

Over: PRATT CREEK

086113600, Benton, IA

Built 2021 Load: 41.1 t ADT: 206

V 27 KIMBALL AVE

Good

Over: MILLER CREEK

87-13-27-02-10, Black Hawk, IA

Built 2021 Load: 41.1 t ADT: 26

E WASHBURN RD

Good

Over: TRIB TO MILLER CREEK

88-12-28-01-10, Black Hawk, IA

Built 2014 Load: 41.1 t ADT: 1,571

E CEDAR-WAPSI RD

Good

Over: TRIB TO CRANE CREEK

90-12-17-01-10, Black Hawk, IA

Built 2022 Load: 41.1 t ADT: 2,600

W DUNKERTON RD

Good

Over: TRIB TO CEDAR RIVER

90-13-34-01-10, Black Hawk, IA

Built 2015 Load: 41.1 t ADT: 1,100

US 20

Good

Over: DRAINAGE DITCH

0.4 mi. W of jct. SR V65, Buchanan, IA

Built 1980 Load: 41.1 t ADT: 10,700

240TH AVE

Good

Over: DRAINAGE DITCH

090352502, Buena Vista, IA

Built 2013 Load: 41.1 t ADT: 50

180TH AVE

Good

Over: BR RACCOON RIVER

091361202, Buena Vista, IA

Built 2012 Load: 41.1 t ADT: 40

M50 160TH AVE

Good

Over: CREEK

093363402, Buena Vista, IA

Built 2016 Load: 41.1 t ADT: 249

WILLOW AVE

Good

Over: FIELD STREAM

082332304, Carroll, IA

Built 2014 Load: 41.1 t ADT: 29

290TH ST

Good

Over: FIELD STREAM

082360801, Carroll, IA

Built 2013 Load: 41.1 t ADT: 71

320TH ST

Good

Over: FIELD STREAM

082362701, Carroll, IA

Built 2020 Load: 41.1 t ADT: 29

FM

Good

Over: HALBUR CR TRIB TO BRUSHY

083 35 18 13, Carroll, IA

Built 2010 Load: 41.1 t ADT: 477

E46 240TH ST

Good

Over: WEST NISHNABOTNA RIVER

083361601, Carroll, IA

Built 2016 Load: 41.1 t ADT: 34

KITTYHAWK AVE

Good

Over: STORM CREEK DD #23

085352302, Carroll, IA

Built 2013 Load: 41.1 t ADT: 79

430TH ST

Good

Over: WILLOW CREEK

095382601, Clay, IA

Built 2020 Load: 41.1 t ADT: 15

FILMORE CT

Good

Over: BEAR CREEK

078292704, Dallas, IA

Built 2015 Load: 41.1 t ADT: 91

360TH STREET

Good

Over: JOHNSON CREEK

RRD over Johnson Creek, Dallas, IA

Built 2022 Load: 41.1 t ADT: 2,628

182ND ST

Good

Over: BEAR CREEK

089 03 14 03, Delaware, IA

Built 2016 Load: 41.1 t ADT: 59

WORTHINGTON RD

Good

Over: CREEK

088021704, Dubuque, IA

Built 2019 Load: 41.1 t ADT: 44

HANNAH RD

Good

Over: CREEK

089010209, Dubuque, IA

Built 2017 Load: 41.1 t ADT: 33

BOCKENSTEDT

Good

Over: MAQUOKETA RIVER

089020704, Dubuque, IA

Built 2019 Load: 41.1 t ADT: 49

FLANNAGAN RD

Good

Over: CREEK

090011303, Dubuque, IA

Built 2016 Load: 41.1 t ADT: 118

X71 CLEAR CREEK RD

Good

Over: CREEK

090021303, Dubuque, IA

Built 2018 Load: 41.1 t ADT: 167

HOSCH RD

Good

Over: CREEK

090023102, Dubuque, IA

Built 2020 Load: 41.1 t ADT: 59

190TH ST

Good

Over: VOLGA RIVER

093090601, Fayette, IA

Built 2023 Load: 41.1 t ADT: 39

245TH ST

Good

Over: CREEK

094100203, Fayette, IA

Built 2018 Load: 41.1 t ADT: 29

CRYSTAL RD.

Good

Over: DIBBLE CR

095072112, Fayette, IA

Built 2012 Load: 41.1 t ADT: 44

GREAT RIVER RD.

Good

Over: TURKEY RIVER

095082508, Fayette, IA

Built 1987 Load: 41.1 t ADT: 314

280TH ST

Good

Over: DRY RUN CREEK

095102003, Fayette, IA

Built 2019 Load: 41.1 t ADT: 39

GREAT RIVER RD.

Good

Over: TURKEY RIVER

095081505, Fayette, IA

Built 1982 Load: 41.1 t ADT: 226

E39 210TH ST

Good

Over: DRAINAGE DITCH 150-86

0.15 Mi E US30, Greene, IA

Built 2017 Load: 41.1 t ADT: 303

I-35

Good

Over: DRAINAGE DITCH 23 & 31

1.0 MILE N OF JCT SR D20, Hamilton, IA

Built 1972 Load: 41.1 t ADT: 16,400

225TH ST

Good

Over: BRANCH OLD MANS CREEK

079100607, Iowa, IA

Built 2020 Load: 41.1 t ADT: 50

218TH WAY

Good

Over: CREEK

072113203, Jefferson, IA

Built 2016 Load: 41.1 t ADT: 40

80TH ST.

Good

Over: SMALL CREEK

084032809, Jones, IA

Built 2011 Load: 41.1 t ADT: 59

190TH ST

Good

Over: FOUR MILE CREEK

095292001, Kossuth, IA

Built 2019 Load: 41.1 t ADT: 30

240TH AVE

Good

Over: MIDDLE BRANCH BLUE EARTH

099271202, Kossuth, IA

Built 2013 Load: 41.1 t ADT: 134

IA 13

Good

Over: BUFFALO CREEK

0.1 mi. N of S Jct SR D62, Linn, IA

Built 1976 Load: 41.1 t ADT: 4,970

LARCH AVE

Good

Over: OVERFLOW OTTER CREEK

098433302, Lyon, IA

Built 2022 Load: 41.1 t ADT: 30

S70 BALSAM AVE

Good

Over: ROCK CREEK

Balsam and 390th, Mitchell, IA

Built 2022 Load: 41.1 t ADT: 354

235TH ST

Good

Over: MCCANDLESS-CLEGHORN

083450803, Monona, IA

Built 2021 Load: 41.1 t ADT: 150

OLIVE AVE

Good

Over: POLLY CREEK

Olive Ave ov Polly Creek, Osceola, IA

Built 2022 Load: 41.1 t ADT: 153

Showing 14,501-14,550 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.