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: WELCH CREEK

082400606, Crawford, IA

Built 1992 Load: 32.7 t ADT: 50

FM

Good

Over: WELCH CREEK

082400709, Crawford, IA

Built 1991 Load: 32.7 t ADT: 219

FM

Good

Over: BOYER RIVER

082401004, Crawford, IA

Built 1972 Load: 32.7 t ADT: 210

FM

Good

Over: SOUTH WILLOW CREEK

082410504, Crawford, IA

Built 2006 Load: 32.7 t ADT: 11

FM

Good

Over: SMALL STREAM

083371302, Crawford, IA

Built 1985 Load: 32.7 t ADT: 180

LOCAL

Good

Over: BEAR CREEK

083391606, Crawford, IA

Built 1974 Load: 32.7 t ADT: 123

LOCAL

Good

Over: NEDDERMEYER CREEK

083402102, Crawford, IA

Built 2010 Load: 32.7 t ADT: 72

LOCAL

Good

Over: BENTON CREEK

084371202, Crawford, IA

Built 1974 Load: 32.7 t ADT: 35

FM

Good

Over: KING CREEK

084371904, Crawford, IA

Built 2007 Load: 32.7 t ADT: 309

FM

Good

Over: KING CREEK

084371904, Crawford, IA

Built 2007 Load: 32.7 t ADT: 309

FM

Good

Over: ROCKY RUN

084382105, Crawford, IA

Built 2004 Load: 32.7 t ADT: 40

M38 ROCKY RUN

Good

Over: ROCKY RUN

084382804, Crawford, IA

Built 2005 Load: 32.7 t ADT: 71

LOCAL

Good

Over: BOYER RIVER

084392603, Crawford, IA

Built 2001 Load: 32.7 t ADT: 89

350TH ST

Good

Over: BEAMAN CREEK

085370502, Crawford, IA

Built 2012 Load: 32.7 t ADT: 15

FM

Good

Over: OTTER CREEK

085391101, Crawford, IA

Built 1989 Load: 32.7 t ADT: 60

250TH ST

Good

Over: BIG CREEK

085393402, Crawford, IA

Built 2011 Load: 32.7 t ADT: 15

LOCAL

Good

Over: TRIB EAST SOLDIER RIVER

084400401, Crawford, IA

Built 2010 Load: 32.7 t ADT: 50

LOCAL

Good

Over: SMALL

078290207, Dallas, IA

Built 2009 Load: 32.7 t ADT: 72

COUNTY ROAD

Good

Over: JIM CREEK

078293204, Dallas, IA

Built 1991 Load: 32.7 t ADT: 60

COUNTY ROAD

Good

Over: BRANCH PANTHER CREEK

079281002, Dallas, IA

Built 1989 Load: 32.7 t ADT: 46

COUNTY ROAD

Good

Over: MOSQUITO CREEK

079292701, Dallas, IA

Built 2008 Load: 32.7 t ADT: 62

250TH ST

Good

Over: WALNUT CREEK

079260801, Dallas, IA

Built 2008 Load: 32.7 t ADT: 79

K AVE

Good

Over: SMALL STREAM

081281401, Dallas, IA

Built 2009 Load: 32.7 t ADT: 229

STATE ST

Good

Over: STREAM

080261202, Dallas, IA

Built 2003 Load: 32.7 t ADT: 1,379

SYCAMORE ST

Good

Over: STREAM

080260101, Dallas, IA

Built 2007 Load: 32.7 t ADT: 182

BROADWAY ST

Good

Over: STREAM

080261202, Dallas, IA

Built 1994 Load: 32.7 t ADT: 289

SOUTH 60TH ST

Good

Over: CREEK

SOUTH 60TH ST, Dallas, IA

Built 2007 Load: 32.7 t ADT: 3,344

WATERFROD ROAD EB

Good

Over: WALNUT CREEK

City of Urbandale. Dallas, Dallas, IA

Built 2018 Load: 32.7 t ADT: 266

EB IA 141

Good

Over: LITTLE BEAVER CREEK

2.2 MILES W OF JCT IA 210, Dallas, IA

Built 1997 Load: 32.7 t ADT: 4,300

FM

Good

Over: SMALL STREAM

067140103, Davis, IA

Built 2001 Load: 32.7 t ADT: 90

EBONY AVE

Good

Over: CARTERS CREEK

068151402, Davis, IA

Built 2000 Load: 32.7 t ADT: 80

FM

Good

Over: SMALL STREAM

069123504, Davis, IA

Built 2006 Load: 32.7 t ADT: 60

QUILL AVE

Good

Over: TRIB S CHEQUEST LAKE CR

069131104, Davis, IA

Built 2015 Load: 32.7 t ADT: 30

NUTHATCH AVE

Good

Over: N CHEQUEST LAKE CREEK

070132006, Davis, IA

Built 2000 Load: 32.7 t ADT: 60

CO RD J40

Good

Over: SMALL STREAM

069133005, Davis, IA

Built 1993 Load: 32.7 t ADT: 1,330

SCARLET AVE

Good

Over: N WYACONDAH CREEK

068123104, Davis, IA

Built 2013 Load: 32.7 t ADT: 15

LOCAL

Good

Over: DICKERSON BRANCH

067260401, Decatur, IA

Built 2000 Load: 32.7 t ADT: 103

FM

Good

Over: WELDON RIVER

068241701, Decatur, IA

Built 2003 Load: 32.7 t ADT: 10

FM GOOSE HILL

Good

Over: SMALL STREAM

087032505, Delaware, IA

Built 2007 Load: 32.7 t ADT: 216

FM 245TH AVE

Good

Over: SMALL STREAM

087043308, Delaware, IA

Built 2008 Load: 32.7 t ADT: 390

FM 110TH AVE

Good

Over: ROBINSON CREEK

087060502, Delaware, IA

Built 2008 Load: 32.7 t ADT: 334

LOC 235TH ST

Good

Over: STREAM

088031103, Delaware, IA

Built 2006 Load: 32.7 t ADT: 20

262ND AVE

Good

Over: SMALL STREAM

088042304, Delaware, IA

Built 2005 Load: 32.7 t ADT: 236

150TH AVE

Good

Over: UNAMED CREEK

000000000, Delaware, IA

Built 2009 Load: 32.7 t ADT: 20

FM 110TH AVE

Good

Over: SMALL STREAM

088062902, Delaware, IA

Built 2006 Load: 32.7 t ADT: 334

180TH ST

Good

Over: HONEY CREEK

089051601, Delaware, IA

Built 2005 Load: 32.7 t ADT: 70

FM 162 AVE

Good

Over: STREAM

089051906, Delaware, IA

Built 2004 Load: 32.7 t ADT: 363

FM 195TH ST

Good

Over: STREAM

089051903, Delaware, IA

Built 2005 Load: 32.7 t ADT: 835

FM 190TH ST

Good

Over: REIGER CREEK

8906249000, Delaware, IA

Built 2009 Load: 32.7 t ADT: 363

X47 300TH AVE

Good

Over: BRANCH OF BEAR CREEK

90 03 33 0019, Delaware, IA

Built 2009 Load: 32.7 t ADT: 470

Showing 11,351-11,400 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.