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

E SCHROCK RD

Good

Over: TRIB TO MILLER CREEK

88-12-31-01-10, Black Hawk, IA

Built 1938 Load: 22.5 t ADT: 412

160TH

Good

Over: BEEMIS CREEK

094190101, Cerro Gordo, IA

Built 1978 Load: 22.5 t ADT: 15

140TH

Good

Over: CREEK

094191701, Cerro Gordo, IA

Built 1978 Load: 22.5 t ADT: 59

NETTLE AVE

Good

Over: CREEK

094202901, Cerro Gordo, IA

Built 1955 Load: 22.5 t ADT: 41

ULMUS

Good

Over: BEAVER CREEK

095192102, Cerro Gordo, IA

Built 1970 Load: 22.5 t ADT: 44

190TH

Good

Over: BEAVER DAM CREEK

095212201, Cerro Gordo, IA

Built 1972 Load: 22.5 t ADT: 26

YARROW

Good

Over: LITTLE LIME CREEK

096192502, Cerro Gordo, IA

Built 1979 Load: 22.5 t ADT: 15

NETTLE

Good

Over: CHESALEA CREEK

096202002, Cerro Gordo, IA

Built 1972 Load: 22.5 t ADT: 1,394

E53

Good

Over: BUTTRICKS CREEK

083301205, Greene, IA

Built 1958 Load: 22.5 t ADT: 1,196

SP 510TH (693)

Good

Over: POSSUM HOLLOW CREEK

1.0 mi. E of 300 Trail Rd, Lucas, IA

Built 2002 Load: 22.5 t ADT: 26

LOCAL

Good

Over: PACKARD CREEK

067170104, Appanoose, IA

Built 2006 Load: 22.6 t ADT: 16

LOCAL

Good

Over: STREAM

069191102, Appanoose, IA

Built 2002 Load: 22.6 t ADT: 26

LOCAL

Good

Over: SMALL

070161803, Appanoose, IA

Built 2000 Load: 22.6 t ADT: 60

LOCAL

Good

Over: SMALL STREAM

067170906, Appanoose, IA

Built 1999 Load: 22.6 t ADT: 11

US 218

Good

Over: DRAINAGE DITCH

1.6 MI. N OF JCT. SR E44, Benton, IA

Built 1960 Load: 22.6 t ADT: 2,690

LOCAL

Good

Over: BRUSHY FORK CREEK

083350601, Carroll, IA

Built 1976 Load: 22.6 t ADT: 45

LOCAL

Good

Over: MIDDLE RACCOON RIVER

084350601, Carroll, IA

Built 1973 Load: 22.6 t ADT: 15

LOCAL

Good

Over: ELK RUN CREEK

085340402, Carroll, IA

Built 1969 Load: 22.6 t ADT: 15

US 218

Good

Over: STREAM

3.3 mi. N of N Jct. IA 9, Mitchell, IA

Built 1979 Load: 22.6 t ADT: 2,260

FM-YORK ROAD

Good

Over: DRAINAGE

000000000, Pottawattamie, IA

Built 2009 Load: 22.6 t ADT: 15

J13 RINNGOLDUNION

Good

Over: STREAM

070310101, Ringgold, IA

Built 2018 Load: 22.6 t ADT: 100

BRYAN RD

Good

Over: TRIB TO CEDAR RIVER

87-11-17-01-10, Black Hawk, IA

Built 2008 Load: 22.7 t ADT: 29

ANSBOROUGH AVE

Good

Over: MILLER CREEK

87-13-21-02-10, Black Hawk, IA

Built 2005 Load: 22.7 t ADT: 59

E MARQUIS RD

Good

Over: CRANE CREEK OVERFLOW

90-12-03-01-20, Black Hawk, IA

Built 2007 Load: 22.7 t ADT: 49

LOCAL

Good

Over: CALAMUS CREEK

082331705, Carroll, IA

Built 1986 Load: 22.7 t ADT: 26

LOCAL

Good

Over: SMALL CREEK

082351001, Carroll, IA

Built 1983 Load: 22.7 t ADT: 40

LOCAL

Good

Over: BRUSHY CREEK

084362602, Carroll, IA

Built 1986 Load: 22.7 t ADT: 45

LOCAL

Good

Over: BRUSHY FORK CREEK

084363601, Carroll, IA

Built 1976 Load: 22.7 t ADT: 34

JASPER RD

Good

Over: SPRING CREEK

076372201, Cass, IA

Built 2011 Load: 22.7 t ADT: 15

HAZEL RD

Good

Over: STREAM

092041703, Clayton, IA

Built 1978 Load: 22.7 t ADT: 30

215TH ST

Good

Over: SMALL STREAM

094043303, Clayton, IA

Built 1986 Load: 22.7 t ADT: 49

145TH ST

Good

Over: SILVER CREEK

095052903, Clayton, IA

Built 1986 Load: 22.7 t ADT: 69

CORAL AVE

Good

Over: SILVER CREEK

095062404, Clayton, IA

Built 2021 Load: 22.7 t ADT: 30

190TH STREET

Good

Over: DRAINAGE

082E22301, Clinton, IA

Built 1958 Load: 22.7 t ADT: 490

IA 2

Good

Over: STREAM

1.0 MI E OF E JCT US 69, Decatur, IA

Built 1927 Load: 22.7 t ADT: 1,720

210 ST

Good

Over: DRAINAGE DITCH

089053505, Delaware, IA

Built 1978 Load: 22.7 t ADT: 1,463

FM - 180TH AVE

Good

Over: SMALL STREAM

088050506, Delaware, IA

Built 1973 Load: 22.7 t ADT: 960

FM

Good

Over: LYTLE CREEK

087E20403, Dubuque, IA

Built 1982 Load: 22.7 t ADT: 1,270

FM

Good

Over: CREEK

087013104, Dubuque, IA

Built 1977 Load: 22.7 t ADT: 510

FARLEY RD

Good

Over: STREAM

000000000, Dubuque, IA

Built 2009 Load: 22.7 t ADT: 680

FM

Good

Over: CREEK

000000000, Dubuque, IA

Built 2009 Load: 22.7 t ADT: 680

LOCAL

Good

Over: CREEK

089E10204, Dubuque, IA

Built 1973 Load: 22.7 t ADT: 25

LOCAL

Good

Over: CREEK

089E12905, Dubuque, IA

Built 1972 Load: 22.7 t ADT: 59

180TH ST

Good

Over: BR WAPSIPINICON RIVER

097140401, Howard, IA

Built 1974 Load: 22.7 t ADT: 21

VALLEY ST

Good

Over: BRANCH TURKEY RIVER

098110304, Howard, IA

Built 1980 Load: 22.7 t ADT: 145

LOCAL SEC RD

Good

Over: DRAINAGE WAY

094421901, O'Brien, IA

Built 2008 Load: 22.7 t ADT: 30

LOCAL SEC RD

Good

Over: SMALL UN-NAMED CREEK

094421902, O'Brien, IA

Built 2006 Load: 22.7 t ADT: 30

LOCAL SEC RD

Good

Over: MCCREATH CR

095391602, O'Brien, IA

Built 2001 Load: 22.7 t ADT: 15

440TH ST

Good

Over: DRY RUN

095403301, O'Brien, IA

Built 2012 Load: 22.7 t ADT: 30

LOCAL

Good

Over: WILLOW CREEK

096393601, O'Brien, IA

Built 2004 Load: 22.7 t ADT: 11

Showing 9,351-9,400 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.