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

FINCH AVE

Good

Over: WATERWAY

092222603, Franklin, IA

Built 1973 Load: 39.5 t ADT: 62

B62

Good

Over: WEST IOWA RIVER

094242101, Hancock, IA

Built 2013 Load: 39.5 t ADT: 50

1020 QUAIL AVE

Good

Over: WEST BRANCH IA RIVER

094243502, Hancock, IA

Built 2010 Load: 39.5 t ADT: 41

FM 220 290TH ST

Good

Over: PLUM CREEK

097263201, Hancock, IA

Built 2007 Load: 39.5 t ADT: 131

162ND ST

Good

Over: SMALL CREEK

085E21703, Jackson, IA

Built 2017 Load: 39.5 t ADT: 44

E 132ND ST S

Good

Over: SLATER CREEK

078170404, Jasper, IA

Built 2018 Load: 39.5 t ADT: 41

S 88TH AVE E

Good

Over: SMALL STREAM

078170205, Jasper, IA

Built 2017 Load: 39.5 t ADT: 104

E 122ND ST S

Good

Over: BUCKLEY CREEK

078173204, Jasper, IA

Built 2020 Load: 39.5 t ADT: 47

W 4TH ST S

Good

Over: BUCK CREEK

078192802, Jasper, IA

Built 2018 Load: 39.5 t ADT: 35

S 112TH AVE W

Good

Over: WALNUT CREEK

078212703, Jasper, IA

Built 2019 Load: 39.5 t ADT: 26

W 4TH ST S

Good

Over: SEWER CREEK

079191002, Jasper, IA

Built 2018 Load: 39.5 t ADT: 187

N 4TH AVE W

Good

Over: SUGAR CREEK

080213501, Jasper, IA

Built 2019 Load: 39.5 t ADT: 100

N 115TH AVE W

Good

Over: WOLF CREEK

081210301, Jasper, IA

Built 2019 Load: 39.5 t ADT: 40

W 124TH ST N

Good

Over: WOLF CREEK

081211002, Jasper, IA

Built 2019 Load: 39.5 t ADT: 26

IA 22

Good

Over: CEDAR RIVER

2.7 mi. E of E Jct. IA 70, Muscatine, IA

Built 1987 Load: 39.5 t ADT: 3,650

FM

Good

Over: DES MOINES RIVER

095312908, Palo Alto, IA

Built 1996 Load: 39.5 t ADT: 290

BEECHNUT RD

Good

Over: FARM CREEK

074392301, Pottawattamie, IA

Built 2017 Load: 39.5 t ADT: 11

BASSWOOD ROAD

Good

Over: INDIAN CREEK

074392601, Pottawattamie, IA

Built 2013 Load: 39.5 t ADT: 11

HICKORY ROAD

Good

Over: JORDAN CREEK

075391401, Pottawattamie, IA

Built 2020 Load: 39.5 t ADT: 26

PINOAK ROAD

Good

Over: SECOND CREEK

076391201, Pottawattamie, IA

Built 2020 Load: 39.5 t ADT: 5

TEAKWOOD ROAD

Good

Over: SILVER CREEK

0774020001, Pottawattamie, IA

Built 2016 Load: 39.5 t ADT: 26

FM

Good

Over: SILVER CREEK

802739, Shelby, IA

Built 2013 Load: 39.5 t ADT: 1,155

LOCAL

Good

Over: W BR FLOYD RIVER

095452701, Sioux, IA

Built 1990 Load: 39.5 t ADT: 50

FM

Good

Over: BRANCH IOWA RIVER

083140703, Tama, IA

Built 1999 Load: 39.5 t ADT: 550

LOCAL

Good

Over: WEST 102 RIVER

068351503, Taylor, IA

Built 2001 Load: 39.5 t ADT: 20

J40

Good

Over: HONEY CREEK

068080803, Van Buren, IA

Built 1992 Load: 39.5 t ADT: 540

IA 5 NB

Good

Over: NORTH RIVER

0.9 MI. S of Jct. U.S. 65, Warren, IA

Built 1983 Load: 39.5 t ADT: 8,200

CO RD

Good

Over: CROOKED CREEK

087271800, Webster, IA

Built 2007 Load: 39.5 t ADT: 640

LOCAL

Good

Over: WINNEBAGO RIVER

099230501, Winnebago, IA

Built 2011 Load: 39.5 t ADT: 35

LITTLE CHURCH RD

Good

Over: TURKEY RIVER

Little Church Rd., Winneshiek, IA

Built 2010 Load: 39.5 t ADT: 39

335TH AVE

Good

Over: BOHEMIAN CREEK

097101704, Winneshiek, IA

Built 2013 Load: 39.5 t ADT: 33

5TH ST

Good

Over: UPPER IOWA RIVER

000000000, Winneshiek, IA

Built 1983 Load: 39.5 t ADT: 830

LOCAL

Good

Over: MILLER CREEK

086430406, Woodbury, IA

Built 1991 Load: 39.5 t ADT: 45

LOCAL

Good

Over: SMALL STREAM

074322801, Adair, IA

Built 2002 Load: 39.6 t ADT: 15

LOCAL

Good

Over: SMALL STREAM

074323207, Adair, IA

Built 2002 Load: 39.6 t ADT: 11

FM

Good

Over: STREAM

077330501, Adair, IA

Built 2005 Load: 39.6 t ADT: 71

FM

Good

Over: STREAM

077330501, Adair, IA

Built 2003 Load: 39.6 t ADT: 71

LOCAL

Good

Over: ROCK CREEK

086110801, Benton, IA

Built 1992 Load: 39.6 t ADT: 20

FM

Good

Over: ROCK CREEK

086110802, Benton, IA

Built 1988 Load: 39.6 t ADT: 70

LOCAL

Good

Over: PRATT CK

086112602, Benton, IA

Built 1988 Load: 39.6 t ADT: 20

FM

Good

Over: SMALL STREAM

091182902, Butler, IA

Built 1997 Load: 39.6 t ADT: 29

FM-530TH ST.

Good

Over: FIDDLE CREEK

092423203, Cherokee, IA

Built 1985 Load: 39.6 t ADT: 778

302ND AVENUE

Good

Over: SMALL STREAM

082E40403, Clinton, IA

Built 2005 Load: 39.6 t ADT: 660

220TH ST

Good

Over: MOSQUITO CREEK

080292901, Dallas, IA

Built 1991 Load: 39.6 t ADT: 41

GRANT AVE

Good

Over: LONE GROVE CREEK

080323104, Guthrie, IA

Built 2021 Load: 39.6 t ADT: 11

FM

Good

Over: BNSF RR

071070501, Henry, IA

Built 2003 Load: 39.6 t ADT: 270

PINION AVE

Good

Over: PLEASANT RUN

078212007, Jasper, IA

Built 2018 Load: 39.6 t ADT: 51

320TH ST

Good

Over: MUDDY CREEK

9045280110, Plymouth, IA

Built 2017 Load: 39.6 t ADT: 11

FM

Good

Over: BROKEN KETTLE CREEK

9347330110, Plymouth, IA

Built 2010 Load: 39.6 t ADT: 199

LOCAL

Good

Over: BIG CEDAR CREEK

090340102, Pocahontas, IA

Built 1989 Load: 39.6 t ADT: 26

Showing 14,051-14,100 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.