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: SMALL STREAM

086370401, Sac, IA

Built 1994 Load: 32.7 t ADT: 30

LOCAL ROAD

Good

Over: SMALL STREAM

086370902, Sac, IA

Built 2001 Load: 32.7 t ADT: 5

380TH ST

Good

Over: SMALL STREAM

086382703, Sac, IA

Built 2012 Load: 32.7 t ADT: 11

LOCAL

Good

Over: WALL LAKE OUTLET

087362601, Sac, IA

Built 1993 Load: 32.7 t ADT: 30

LOCAL

Good

Over: STREAM

087372801, Sac, IA

Built 1997 Load: 32.7 t ADT: 20

LOCAL

Good

Over: STREAM

087381002, Sac, IA

Built 1994 Load: 32.7 t ADT: 20

FM

Good

Over: SMALL CREEK

087381901, Sac, IA

Built 1993 Load: 32.7 t ADT: 20

FM

Good

Over: ODEBOLT CREEK

087382304, Sac, IA

Built 1984 Load: 32.7 t ADT: 1,228

LOCAL

Good

Over: SMALL STREAM

087383602, Sac, IA

Built 1999 Load: 32.7 t ADT: 26

LOCAL

Good

Over: SMALL STREAM

088360802, Sac, IA

Built 1999 Load: 32.7 t ADT: 11

LOCAL

Good

Over: INDIAN CREEK

088372501, Sac, IA

Built 1999 Load: 32.7 t ADT: 20

IRA AVE

Good

Over: STREAM

088373202, Sac, IA

Built 2020 Load: 32.7 t ADT: 11

FM

Good

Over: SO SILVER CREEK

088381702, Sac, IA

Built 1999 Load: 32.7 t ADT: 170

DEAN AVE

Good

Over: SMALL STREAM

088383302, Sac, IA

Built 2017 Load: 32.7 t ADT: 15

ESTHER AVE

Good

Over: SMALL STREAM

088383402, Sac, IA

Built 2019 Load: 32.7 t ADT: 11

FM

Good

Over: DD 38 (BUCK RUN CREEK)

089361002, Sac, IA

Built 2008 Load: 32.7 t ADT: 509

LOCAL

Good

Over: RACCOON RIVER

089361201, Sac, IA

Built 1989 Load: 32.7 t ADT: 11

LOCAL

Good

Over: STREAM

089361501, Sac, IA

Built 2003 Load: 32.7 t ADT: 20

FM

Good

Over: NO NAME CREEK

089362101, Sac, IA

Built 1992 Load: 32.7 t ADT: 290

LOCAL

Good

Over: STREAM

089371501, Sac, IA

Built 1997 Load: 32.7 t ADT: 15

GARD AVE

Good

Over: BOYER RIVER

0893716, Sac, IA

Built 2010 Load: 32.7 t ADT: 848

LOCAL

Good

Over: BOYER RIVER

089372701, Sac, IA

Built 1989 Load: 32.7 t ADT: 26

300TH ST

Good

Over: CREEK

087381601, Sac, IA

Built 2014 Load: 32.7 t ADT: 15

Y40 (70TH AVE)

Good

Over: CREEK

078E20501 OVER MUD CREEK, Scott, IA

Built 2011 Load: 32.7 t ADT: 1,530

LOCAL

Good

Over: CREEK

079E22801, Scott, IA

Built 1988 Load: 32.7 t ADT: 25

E.53RD ST.

Good

Over: PHEASANT CREEK

000000000, Scott, IA

Built 1990 Load: 32.7 t ADT: 15,400

ELMORE AVE

Good

Over: PHEASANT CREEK

000000000, Scott, IA

Built 1994 Load: 32.7 t ADT: 16,900

CROW CREEK RD

Good

Over: WEST PIGEON CREEK

Bettendorf, IA, Scott, IA

Built 1996 Load: 32.7 t ADT: 3,221

1600TH ST

Good

Over: SMALL STREAM

EAST OF BEECH RD & 1600th, Shelby, IA

Built 2012 Load: 32.7 t ADT: 62

LOCAL

Good

Over: SMALL STREAM

802540, Shelby, IA

Built 2002 Load: 32.7 t ADT: 21

LOCAL

Good

Over: KIDDS CREEK

081382901, Shelby, IA

Built 2003 Load: 32.7 t ADT: 46

US 30

Good

Over: DYE CREEK

2.1 MILES W OF JCT US 65, Story, IA

Built 1963 Load: 32.7 t ADT: 9,400

663RD AVE

Good

Over: SMALL STREAM

082222608, Story, IA

Built 2011 Load: 32.7 t ADT: 71

IA 210

Good

Over: ROCK CREEK

1.2 MILE WEST OF SR S28, Story, IA

Built 1974 Load: 32.7 t ADT: 1,400

R70/580TH AVE

Good

Over: BALLARD CREEK

082231604, Story, IA

Built 1989 Load: 32.7 t ADT: 818

210TH ST

Good

Over: DYE CREEK

0.15 mi E. of US Hwy 65, Story, IA

Built 2019 Load: 32.7 t ADT: 26

OLD US 30

Good

Over: MUD CREEK

083152604, Tama, IA

Built 2011 Load: 32.7 t ADT: 2,098

370TH ST

Good

Over: RICHLAND CREEK

082162101, Tama, IA

Built 2013 Load: 32.7 t ADT: 97

P AVE

Good

Over: BRANCH OF OTTER CREEK

083142202, Tama, IA

Built 2010 Load: 32.7 t ADT: 49

LOCAL

Good

Over: BRANCH OTTER CREEK

083150101, Tama, IA

Built 1994 Load: 32.7 t

FM

Good

Over: INDIAN CREEK

083162901, Tama, IA

Built 1984 Load: 32.7 t ADT: 334

FM

Good

Over: BRANCH SALT CREEK

084130502, Tama, IA

Built 1994 Load: 32.7 t ADT: 727

250TH ST

Good

Over: BRANCH JORDAN CREEK

084152001, Tama, IA

Built 2019 Load: 32.7 t ADT: 39

FM

Good

Over: BRANCH IOWA RIVER

084152803, Tama, IA

Built 2003 Load: 32.7 t ADT: 59

260TH ST

Good

Over: BRANCH DEER CREEK

084152901, Tama, IA

Built 2010 Load: 32.7 t ADT: 20

FM

Good

Over: BRANCH WOLF CREEK

085141506, Tama, IA

Built 1991 Load: 32.7 t ADT: 167

LOCAL

Good

Over: CRYSTAL CREEK

085153101, Tama, IA

Built 2006 Load: 32.7 t ADT: 49

C AVE

Good

Over: WOLF CREEK

085160904, Tama, IA

Built 2015 Load: 32.7 t ADT: 97

T AVE

Good

Over: BRANCH WOLF CREEK

086131805, Tama, IA

Built 2019 Load: 32.7 t ADT: 15

140TH ST

Good

Over: BRANCH OF WOLF CREEK

086132405, Tama, IA

Built 2020 Load: 32.7 t ADT: 44

Showing 12,101-12,150 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.