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

160TH ST

Good

Over: SOUTH FORK BEAVER CREEK

088170601, Grundy, IA

Built 2022 Load: 41.8 t ADT: 44

LOCAL

Good

Over: SILVER CREEK

088391802, Ida, IA

Built 1992 Load: 41.8 t ADT: 15

287TH ST

Good

Over: LYTLE CREEK

086E20603, Jackson, IA

Built 2017 Load: 41.8 t ADT: 39

BLACKHAWK AVE

Good

Over: BR CLEAR CR

080082003, Johnson, IA

Built 2021 Load: 41.8 t ADT: 275

A42 370TH ST

Good

Over: E FORK DES MOINES RIVER

098291901, Kossuth, IA

Built 2021 Load: 41.8 t ADT: 489

HENRY LEE STREET

Good

Over: LITTLE CEDAR CREEK

0.77 mi W. of 130th Ave, Lee, IA

Built 2021 Load: 41.8 t ADT: 71

CO HOME RD

Good

Over: CRAPAPPLE CREEK

084061401, Linn, IA

Built 2006 Load: 41.8 t ADT: 1,935

NORTH CENTER ST

Good

Over: IOWA RIVER OVERFLOW

084182604, Marshall, IA

Built 2020 Load: 41.8 t ADT: 737

LCL-APPLEWOOD

Good

Over: MUD CREEK

073410201, Mills, IA

Built 1990 Load: 41.8 t ADT: 15

A19 UNDERWOOD AVE

Good

Over: WAPSIPINICON RIVER

At 480th & Underwood, Mitchell, IA

Built 2021 Load: 41.8 t ADT: 33

LOCAL SEC RD

Good

Over: BARRY CREEK

095391701, O'Brien, IA

Built 1976 Load: 41.8 t ADT: 15

FM

Good

Over: LAMKIN CREEK

096422202, O'Brien, IA

Built 1976 Load: 41.8 t ADT: 1,337

LOCAL

Good

Over: ENGELS CREEK

097422202, O'Brien, IA

Built 1981 Load: 41.8 t ADT: 21

C 38

Good

Over: MINK CREEK

92-46-35-01-10, Plymouth, IA

Built 2012 Load: 41.8 t ADT: 1,347

120TH ST

Good

Over: INDIAN CREEK

93471701104200, Plymouth, IA

Built 2021 Load: 41.8 t ADT: 5

HONEYSUCKLE RD

Good

Over: STREAM

075410801, Pottawattamie, IA

Built 2011 Load: 41.8 t ADT: 20

290TH ST

Good

Over: MASON CREEK

080E32101, Scott, IA

Built 2009 Load: 41.8 t ADT: 510

P64 PRIMROSE DR

Good

Over: TWELVE MILE CREEK

071283403, Union, IA

Built 2017 Load: 41.8 t ADT: 71

LOCAL

Good

Over: MIDDLE AVERY CREEK

073153204, Wapello, IA

Built 1985 Load: 41.8 t ADT: 41

QUEBEC ST

Good

Over: FLANK CREEK

074220301, Warren, IA

Built 2019 Load: 41.8 t ADT: 26

IDAHO STREET

Good

Over: BRANCH MIDDLE RIVER

076251503, Warren, IA

Built 2021 Load: 41.8 t ADT: 113

FM

Good

Over: NORTH CHARITON

070231901, Wayne, IA

Built 2008 Load: 41.8 t ADT: 520

160TH ST

Good

Over: LIZARD CREEK

089300301, Webster, IA

Built 2011 Load: 41.8 t ADT: 34

440TH ST

Good

Over: WINNEBAGO RIVER

099231701, Winnebago, IA

Built 2012 Load: 41.8 t ADT: 41

D38 (220TH ST)

Good

Over: BIG CREEK

088433405, Woodbury, IA

Built 2011 Load: 41.8 t ADT: 369

200TH ST

Good

Over: WEST FORK LITTLE SIOUX

088452803, Woodbury, IA

Built 2021 Load: 41.8 t ADT: 50

LOCAL

Good

Over: BRUSHY FORK CREEK

084353102, Carroll, IA

Built 1994 Load: 41.9 t ADT: 11

230TH ST

Good

Over: ROCK CREEK

080011103, Cedar, IA

Built 2006 Load: 41.9 t ADT: 71

US 151 SB

Good

Over: W BRANCH OF KITTY CREEK

0.5 MI. S OF JCT. IA 38, Jones, IA

Built 2003 Load: 41.9 t ADT: 4,400

LOCAL

Good

Over: SWEENEY CREEK

097423602, O'Brien, IA

Built 1995 Load: 41.9 t ADT: 30

IA 7

Good

Over: PRARIE CREEK DD

1.5 mi. E of SR M54, Buena Vista, IA

Built 2000 Load: 42.0 t ADT: 1,230

FM

Good

Over: WEST CREEK

074242705, Warren, IA

Built 1987 Load: 42.0 t ADT: 499

LOC GRANT AVE

Good

Over: SMALL STREAM

090093004, Buchanan, IA

Built 2005 Load: 42.1 t ADT: 91

FM

Good

Over: BEAVER CREEK

090162504, Butler, IA

Built 1987 Load: 42.1 t ADT: 137

295TH ST

Good

Over: MIDDLE RACCOON RIVER

082341203, Carroll, IA

Built 2012 Load: 42.1 t ADT: 20

FM

Good

Over: WEST NISHNABOTNA RIVER

082 36 20 04, Carroll, IA

Built 2010 Load: 42.1 t ADT: 1,693

570TH ST

Good

Over: SMALL CREEK

077371502, Cass, IA

Built 2014 Load: 42.1 t ADT: 51

300TH ST

Good

Over: OCHEYDAN RIVER

097381901, Clay, IA

Built 2015 Load: 42.1 t ADT: 21

145TH ST

Good

Over: SMALL STREAM

083E32603, Clinton, IA

Built 2005 Load: 42.1 t ADT: 25

E35 L AVE

Good

Over: MILLER CREEK

.57 E NW Cor 32-84-37, Crawford, IA

Built 2015 Load: 42.1 t ADT: 89

CEDAR AVE

Good

Over: CARTERS CREEK

068151602, Davis, IA

Built 2017 Load: 42.1 t ADT: 20

160TH ST

Good

Over: SPRING CREEK

92212501, Franklin, IA

Built 2015 Load: 42.1 t ADT: 47

FM

Good

Over: BIG CEDAR CREEK

071070806, Henry, IA

Built 1983 Load: 42.1 t ADT: 80

US 34 EB

Good

Over: BNSF RR

0.9 mi. W of Jct. SR W55, Henry, IA

Built 2002 Load: 42.1 t ADT: 2,700

US 34 WB

Good

Over: BNSF RR

0.9 mi. W of Jct. SR W55, Henry, IA

Built 2002 Load: 42.1 t ADT: 2,700

LOCAL

Good

Over: BUFFALO CREEK

088393102, Ida, IA

Built 1992 Load: 42.1 t ADT: 30

CENTERVILLE RD

Good

Over: TETE DES MORTS CREEK

087E31603, Jackson, IA

Built 2012 Load: 42.1 t ADT: 190

FM

Good

Over: SKUNK RIVER

073083605, Jefferson, IA

Built 1981 Load: 42.1 t ADT: 80

SHAW RD

Good

Over: FAWN CREEK

084041104, Jones, IA

Built 2020 Load: 42.1 t ADT: 671

P 44 (130TH AVE

Good

Over: E FORK DES MOINES RIVER

097280702, Kossuth, IA

Built 2012 Load: 42.1 t ADT: 267

Showing 14,701-14,750 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.