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

FM

Good

Over: SMALL

080101802, Iowa, IA

Built 1994 Load: 32.7 t ADT: 1,790

LOCAL

Good

Over: SMALL STREAM

080102501, Iowa, IA

Built 2005 Load: 32.7 t ADT: 15

HH AVE

Good

Over: BIG BEAR CREEK

080110806, Iowa, IA

Built 2004 Load: 32.7 t ADT: 90

LOCAL LEGNO

Good

Over: SMALL STREAM

080113106, Iowa, IA

Built 2002 Load: 32.7 t ADT: 30

FM

Good

Over: SMALL

081101803, Iowa, IA

Built 1998 Load: 32.7 t ADT: 1,230

FM

Good

Over: SMALL

078103104, Iowa, IA

Built 1987 Load: 32.7 t ADT: 160

210TH ST

Good

Over: LITTLE BEAR CREEK

080123301, Iowa, IA

Built 2001 Load: 32.7 t ADT: 71

HWY F-70 W

Good

Over: PRARIE CREEK

078203101, Jasper, IA

Built 2007 Load: 32.7 t ADT: 530

FM

Good

Over: CALHOUN CREEK

078203207, Jasper, IA

Built 2007 Load: 32.7 t ADT: 530

FM

Good

Over: UNION VALLEY CREEK

078203301, Jasper, IA

Built 2007 Load: 32.7 t ADT: 530

HIGHWAY S6G

Good

Over: PRAIRIE CREEK

078211202, Jasper, IA

Built 2012 Load: 32.7 t ADT: 540

S 96TH AVE W

Good

Over: PRAIRIE CREEK

078211301, Jasper, IA

Built 1991 Load: 32.7 t ADT: 70

HIGHWAY T-22 S

Good

Over: SLATER CREEK

079181302, Jasper, IA

Built 2007 Load: 32.7 t ADT: 1,160

HIGHWAY T-22 S

Good

Over: SLATER CREEK

079181302, Jasper, IA

Built 2007 Load: 32.7 t ADT: 1,160

W 66TH ST S

Good

Over: SMALL STREAM

079201404, Jasper, IA

Built 2019 Load: 32.7 t ADT: 30

W 92ND ST S

Good

Over: RED ROCK CREEK

079203202, Jasper, IA

Built 2018 Load: 32.7 t ADT: 51

S 44TH AVE W

Good

Over: SMALL STREAM

079211501, Jasper, IA

Built 2019 Load: 32.7 t ADT: 73

N 67TH AVE E

Good

Over: SUGAR CREEK

080170101, Jasper, IA

Built 2016 Load: 32.7 t ADT: 15

N 51ST AVE EAST

Good

Over: BURR OAK CREEK

080181503, Jasper, IA

Built 2020 Load: 32.7 t ADT: 30

N 59TH AVE WEST

Good

Over: CHERRY CREEK

080190701, Jasper, IA

Built 2021 Load: 32.7 t ADT: 51

W 28TH ST NORTH

Good

Over: CHERRY CREEK

080192008, Jasper, IA

Built 2020 Load: 32.7 t ADT: 91

LOCAL

Good

Over: TURKEY CREEK

080200701, Jasper, IA

Built 2016 Load: 32.7 t ADT: 30

W 108TH NORTH

Good

Over: INDIAN CREEK

080211202, Jasper, IA

Built 2003 Load: 32.7 t ADT: 135

N 115TH AVE E

Good

Over: BRUSH CREEK

081170301, Jasper, IA

Built 2018 Load: 32.7 t ADT: 51

E 124TH ST N

Good

Over: SMALL STREAM

081171602, Jasper, IA

Built 2014 Load: 32.7 t ADT: 11

N 75TH AVE E

Good

Over: ROCK CREEK

081173301, Jasper, IA

Built 2012 Load: 32.7 t ADT: 35

FM

Good

Over: CLEAR CREEK

081201901, Jasper, IA

Built 1987 Load: 32.7 t ADT: 1,470

HWY F17 W

Good

Over: MUD CREEK

081212401, Jasper, IA

Built 1987 Load: 32.7 t ADT: 1,470

N 75TH AVE E

Good

Over: SMALL STREAM

081183103, Jasper, IA

Built 2019 Load: 32.7 t ADT: 21

IA 904

Good

Over: BNSF RR

072103000, Jefferson, IA

Built 2011 Load: 32.7 t ADT: 460

PEPPERMINT BLVD

Good

Over: BRANCH TROY CREEK

071090305, Jefferson, IA

Built 2016 Load: 32.7 t ADT: 15

220TH ST

Good

Over: BR TROY CREEK

071090403, Jefferson, IA

Built 2018 Load: 32.7 t ADT: 80

FM

Good

Over: BRANCH CEDAR CREEK

071101004, Jefferson, IA

Built 1990 Load: 32.7 t ADT: 360

265TH ST

Good

Over: CREEK

071102605, Jefferson, IA

Built 2020 Load: 32.7 t ADT: 30

IVY AVE

Good

Over: CREEK

071102806, Jefferson, IA

Built 2016 Load: 32.7 t ADT: 20

EPISCIA AVE

Good

Over: CREEK

071111104, Jefferson, IA

Built 2019 Load: 32.7 t ADT: 15

ELM AVE

Good

Over: LICK CREEK

071112302, Jefferson, IA

Built 2019 Load: 32.7 t ADT: 11

FM

Good

Over: BRUSH CREEK

072090804, Jefferson, IA

Built 2000 Load: 32.7 t ADT: 1,270

PINE AVE

Good

Over: BRANCH OF BRUSH CREEK

072091506, Jefferson, IA

Built 2012 Load: 32.7 t ADT: 30

FM

Good

Over: CROW CREEK

072093105, Jefferson, IA

Built 1994 Load: 32.7 t ADT: 1,400

171ST BLVD

Good

Over: CREEK

072100703, Jefferson, IA

Built 2018 Load: 32.7 t ADT: 26

SPRUCE AVE

Good

Over: BURR OAK CREEK

073080602, Jefferson, IA

Built 1990 Load: 32.7 t ADT: 120

136TH ST

Good

Over: BR WALNUT CREEK

73081903, Jefferson, IA

Built 2018 Load: 32.7 t ADT: 40

REDWOOD AVE

Good

Over: BRANCH WALNUT CREEK

073091304, Jefferson, IA

Built 2020 Load: 32.7 t ADT: 26

OLIVE AVE

Good

Over: BR SOUTH WALNUT CREEK

073093307, Jefferson, IA

Built 2016 Load: 32.7 t ADT: 15

FM

Good

Over: SOUTH WALNUT CREEK

073093306, Jefferson, IA

Built 2006 Load: 32.7 t ADT: 1,030

JASMINE AVE

Good

Over: MIDDLE WALNUT CREEK

073101004, Jefferson, IA

Built 2011 Load: 32.7 t ADT: 170

105TH ST

Good

Over: CREEK

073110303, Jefferson, IA

Built 2018 Load: 32.7 t ADT: 11

ELM AVE

Good

Over: CREEK

073112302, Jefferson, IA

Built 2017 Load: 32.7 t ADT: 80

230TH ST

Good

Over: CREEK

071110202, Jefferson, IA

Built 2019 Load: 32.7 t ADT: 45

Showing 11,701-11,750 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.