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

LOCAL

Good

Over: BR PRATT CREEK

085122701, Benton, IA

Built 1988 Load: 32.7 t ADT: 26

LOCAL

Good

Over: SMALL

085113001, Benton, IA

Built 1988 Load: 32.7 t ADT: 45

LOCAL

Good

Over: SMALL

082121201, Benton, IA

Built 1988 Load: 32.7 t ADT: 15

LOCAL

Good

Over: SMALL STREAM

085103501, Benton, IA

Built 1991 Load: 32.7 t ADT: 33

LOCAL

Good

Over: SMALL STREAM

086122302, Benton, IA

Built 1991 Load: 32.7 t ADT: 15

FM

Good

Over: BR PRATT CREEK

085121002, Benton, IA

Built 1995 Load: 32.7 t ADT: 15

FM

Good

Over: BRANCH OF PRAIRIE CREEK

083112502, Benton, IA

Built 1999 Load: 32.7 t ADT: 1,220

30 AVE

Good

Over: BR OF DRY CREEK

083092102, Benton, IA

Built 1997 Load: 32.7 t ADT: 70

25 AVE

Good

Over: SMALL STREAM

086102202, Benton, IA

Built 1998 Load: 32.7 t ADT: 70

18TH AVE

Good

Over: STREAM

084113302, Benton, IA

Built 2003 Load: 32.7 t ADT: 30

2ND AVENUE

Good

Over: DRAINAGE

085102100, Benton, IA

Built 1995 Load: 32.7 t ADT: 890

US 218

Good

Over: BRANCH OF WILD CAT CREEK

2.0 MI. N OF SR E-44, Benton, IA

Built 1997 Load: 32.7 t ADT: 2,690

BRANDON RD

Good

Over: TRIB TO CEDAR RIVER

87-11-20-09-10, Black Hawk, IA

Built 2009 Load: 32.7 t ADT: 707

HOLMES RD

Good

Over: TRIB TO ROCK CREEK

87-14-36-02-05, Black Hawk, IA

Built 2001 Load: 32.7 t ADT: 25

GILBERTVILLE RD

Good

Over: POYNER CREEK

88-12-10-04-10, Black Hawk, IA

Built 1975 Load: 32.7 t ADT: 815

ZANETA RD

Good

Over: TRIB TO BLACK HAWK CREEK

88-14-32-03-10, Black Hawk, IA

Built 1986 Load: 32.7 t ADT: 982

HESS RD

Good

Over: SINK CREEK

CITY CULVERT NO. 39C, Black Hawk, IA

Built 1997 Load: 32.7 t ADT: 4,016

BURTON AVE

Good

Over: STREAM

CITY CULVERT NO. 42C, Black Hawk, IA

Built 1988 Load: 32.7 t ADT: 66

ALEXANDRA DRIVE

Good

Over: DRAINAGE

CITY CULVERT NO. 56C, Black Hawk, IA

Built 1996 Load: 32.7 t ADT: 2,520

IA 27 & RAMPS

Good

Over: DRY RUN CREEK

2.1 mi. S of Jct. US 218, Black Hawk, IA

Built 1993 Load: 32.7 t ADT: 13,800

IA 27/58

Good

Over: DRY RUN CREEK

0.4 mi. N Jct. University, Black Hawk, IA

Built 1994 Load: 32.7 t ADT: 15,100

SB IA 27

Good

Over: CEDAR RIVER & RR

0.8 Mi. S OF JCT. US 218, Black Hawk, IA

Built 1995 Load: 32.7 t ADT: 8,300

A AVE

Good

Over: STREAM

084280702, Boone, IA

Built 2019 Load: 32.7 t ADT: 5

270TH ST

Good

Over: STREAM

091113601, Bremer, IA

Built 2014 Load: 32.7 t ADT: 49

LOCAL

Good

Over: CRANE CREEK

091120501, Bremer, IA

Built 2004 Load: 32.7 t ADT: 70

BUTLER RD

Good

Over: CREEK

091143004, Bremer, IA

Built 2002 Load: 32.7 t ADT: 39

VIKING AVE

Good

Over: STREAM

092111502, Bremer, IA

Built 2001 Load: 32.7 t ADT: 1,090

VIKING AV

Good

Over: CREEK

092113402, Bremer, IA

Built 2005 Load: 32.7 t ADT: 854

LOCAL

Good

Over: BASKINS CREEK

092130701, Bremer, IA

Built 2005 Load: 32.7 t ADT: 49

BISHOP AV

Good

Over: STREAM

092140804, Bremer, IA

Built 2005 Load: 32.7 t ADT: 44

180TH ST

Good

Over: STREAM

092141109, Bremer, IA

Built 2002 Load: 32.7 t ADT: 766

212TH ST

Good

Over: STREAM

092143603, Bremer, IA

Built 1998 Load: 32.7 t ADT: 638

PIEDMONT AVE

Good

Over: STREAM

093121002, Bremer, IA

Built 2006 Load: 32.7 t ADT: 20

EASTON AV

Good

Over: STREAM

093143502, Bremer, IA

Built 2006 Load: 32.7 t ADT: 766

GARDEN AVE

Good

Over: SMALL STREAM

091130704, Bremer, IA

Built 2000 Load: 32.7 t ADT: 275

GARDEN AVE

Good

Over: CREEK

091133102, Bremer, IA

Built 2011 Load: 32.7 t ADT: 235

WAPSIE ST

Good

Over: SMALL STREAM

093112600, Bremer, IA

Built 1997 Load: 32.7 t ADT: 142

5TH AVE NW

Good

Over: SMALL STREAM

AT INT W/ 6TH ST NW, Bremer, IA

Built 2016 Load: 32.7 t ADT: 2,918

US 218

Good

Over: DRAINAGE DITCH

0.1 NORTH OF JCT. SR C13, Bremer, IA

Built 2001 Load: 32.7 t ADT: 10,900

LOCAL 280TH ST.

Good

Over: SMALL STREAM

000087090601, Buchanan, IA

Built 2010 Load: 32.7 t ADT: 16

305TH ST

Good

Over: BEAR CREEK

S17 T87N R09W, Buchanan, IA

Built 2017 Load: 32.7 t ADT: 26

240TH ST

Good

Over: SMALL STREAM

8807152100, Buchanan, IA

Built 2016 Load: 32.7 t ADT: 29

FM YORK AVE

Good

Over: SMALL STREAM

088072502, Buchanan, IA

Built 2008 Load: 32.7 t ADT: 69

252ND ST

Good

Over: BEAR CREEK

088092103, Buchanan, IA

Built 2000 Load: 32.7 t ADT: 73

200TH ST

Good

Over: SMALL STREAM

089102701, Buchanan, IA

Built 2015 Load: 32.7 t ADT: 15

FM 115TH ST

Good

Over: SMALL STREAM

090070803, Buchanan, IA

Built 2005 Load: 32.7 t ADT: 49

POSTEL AVENUE

Good

Over: CREEK

090082204, Buchanan, IA

Built 2005 Load: 32.7 t ADT: 10

LOCAL

Good

Over: DRAINAGE DITCH

090360401, Buena Vista, IA

Built 2005 Load: 32.7 t ADT: 60

FM

Good

Over: BOYER CREEK

090373401, Buena Vista, IA

Built 1998 Load: 32.7 t ADT: 20

30TH AVE

Good

Over: BR MAPLE RIVER

090382102, Buena Vista, IA

Built 2005 Load: 32.7 t ADT: 30

Showing 11,151-11,200 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.