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

110TH ST

Fair

Over: UNAMED CREEK

092101501, Fayette, IA

Built 1997 Load: 32.7 t ADT: 33

78TH ST

Fair

Over: UNAMED CREEK

092103203, Fayette, IA

Built 1995 Load: 32.7 t ADT: 15

78TH ST

Fair

Over: CREEK

092103303, Fayette, IA

Built 1988 Load: 32.7 t ADT: 15

V AVE

Fair

Over: UNAMED CREEK

092103404, Fayette, IA

Built 2008 Load: 32.7 t ADT: 20

FOX RD.

Fair

Over: UNNAMED CREEK

093071803, Fayette, IA

Built 1990 Load: 32.7 t ADT: 44

BEAR RD.

Fair

Over: MINK CREEK

093072303, Fayette, IA

Built 1917 Load: 32.7 t ADT: 33

W14

Fair

Over: VOLGA RIVER

093090502, Fayette, IA

Built 1956 Load: 32.7 t ADT: 491

180TH ST

Fair

Over: UNNAMED CREEK

093090801, Fayette, IA

Built 1994 Load: 32.7 t ADT: 39

180TH ST

Fair

Over: COULEE

093091103, Fayette, IA

Built 1991 Load: 32.7 t ADT: 20

180TH ST

Fair

Over: UNAMED CREEK

093091201, Fayette, IA

Built 1998 Load: 32.7 t ADT: 20

S AVE

Fair

Over: UNAMED CREEK

093091802, Fayette, IA

Built 1926 Load: 32.7 t ADT: 26

X AVE

Fair

Over: UNAMED CREEK

093100502, Fayette, IA

Built 1928 Load: 32.7 t ADT: 33

180TH ST

Fair

Over: UNNAMED CREEK

093100701, Fayette, IA

Built 1995 Load: 32.7 t ADT: 39

160TH ST

Fair

Over: VOLGA RIVER

093102401, Fayette, IA

Built 1928 Load: 32.7 t ADT: 29

140TH ST

Fair

Over: UNAMED CREEK

093103101, Fayette, IA

Built 1998 Load: 32.7 t ADT: 49

F AVE.

Fair

Over: BELL CREEK

094070802, Fayette, IA

Built 1916 Load: 32.7 t ADT: 15

GOLDEN RD.

Fair

Over: UNNAMED CR

094071503, Fayette, IA

Built 1932 Load: 32.7 t ADT: 913

ECHO VALLEY RD.

Fair

Over: UNAMED CREEK

094071504, Fayette, IA

Built 1990 Load: 32.7 t ADT: 78

HORNET RD.

Fair

Over: UNAMED CR

094081403, Fayette, IA

Built 1989 Load: 32.7 t ADT: 29

ROSE RD

Fair

Over: CREEK

094090704, Fayette, IA

Built 1963 Load: 32.7 t ADT: 432

QUARTZ RD

Fair

Over: UNNAMED CREEK

094090804, Fayette, IA

Built 1923 Load: 32.7 t ADT: 59

Q AVE

Fair

Over: N BR VOLGA RIVER

094092102, Fayette, IA

Built 1998 Load: 32.7 t ADT: 29

Q AVE

Fair

Over: UNAMED CREEK

094092802, Fayette, IA

Built 1926 Load: 32.7 t ADT: 15

210TH ST

Fair

Over: VOLGA RIVER NORTH BRANCH

094092903, Fayette, IA

Built 1997 Load: 32.7 t ADT: 157

200TH ST

Fair

Over: UNAMED CREEK

094093101, Fayette, IA

Built 1997 Load: 32.7 t ADT: 44

247TH ST

Fair

Over: DRY RUN TO CRANE CREEK

094100403, Fayette, IA

Built 1998 Load: 32.7 t ADT: 49

240TH ST

Fair

Over: UNAMED CREEK

094100901, Fayette, IA

Built 2000 Load: 32.7 t ADT: 15

V AVE

Fair

Over: UNAMED CREEK

094101002, Fayette, IA

Built 1997 Load: 32.7 t ADT: 26

Y AVE

Fair

Over: SMALL STREAM

094103002, Fayette, IA

Built 1989 Load: 32.7 t ADT: 11

BIRCH RD.

Fair

Over: CREEK

095071003, Fayette, IA

Built 1998 Load: 32.7 t ADT: 25

275TH ST.

Fair

Over: UNAMED CR

095082109, Fayette, IA

Built 1996 Load: 32.7 t ADT: 44

MAJOR RD

Fair

Over: UNNAMED CREEK

095090211, Fayette, IA

Built 1998 Load: 32.7 t ADT: 44

S AVE

Fair

Over: CREEK

095091902, Fayette, IA

Built 1998 Load: 32.7 t ADT: 59

FM

Fair

Over: CREEK

095091903, Fayette, IA

Built 1995 Load: 32.7 t ADT: 34

OTTER RD

Fair

Over: SMALL STREAM

095093404, Fayette, IA

Built 1990 Load: 32.7 t ADT: 29

NEST RD

Fair

Over: UNAMED CREEK

095093510, Fayette, IA

Built 1998 Load: 32.7 t ADT: 15

300TH ST

Fair

Over: DRY RUN CREEK

095100701, Fayette, IA

Built 1990 Load: 32.7 t ADT: 33

UNICORN RD

Fair

Over: UNAMED CREEK

095101004, Fayette, IA

Built 2003 Load: 32.7 t ADT: 26

W AVE

Fair

Over: DRY RUN CREEK

095103301, Fayette, IA

Built 1996 Load: 32.7 t ADT: 26

50TH ST

Fair

Over: SMALL

091101301, Fayette, IA

Built 1984 Load: 32.7 t ADT: 26

C AVE.

Fair

Over: SMALL

092072602, Fayette, IA

Built 1988 Load: 32.7 t ADT: 88

BASSWOOD RD

Fair

Over: QUINN CREEK

095070206, Fayette, IA

Built 1985 Load: 32.7 t ADT: 33

MAPLE RD

Fair

Over: SMALL STREAM

095092404, Fayette, IA

Built 1997 Load: 32.7 t ADT: 49

S AVE

Fair

Over: SMALL STREAM

095091802, Fayette, IA

Built 1998 Load: 32.7 t ADT: 59

XRAY RD

Fair

Over: SMALL STREAM

095103103, Fayette, IA

Built 2000 Load: 32.7 t ADT: 29

UNICORN RD

Fair

Over: SMALL STREAM

091102704, Fayette, IA

Built 2001 Load: 32.7 t ADT: 20

BEAR RD

Fair

Over: MINK CREEK

093071104, Fayette, IA

Built 2002 Load: 32.7 t ADT: 33

200TH STREET

Fair

Over: COULEE CREEK

094083501, Fayette, IA

Built 2021 Load: 32.7 t ADT: 15

XAVIER RD

Fair

Over: UNNAMED CREEK

095103101, Fayette, IA

Built 2021 Load: 32.7 t ADT: 11

I AVE

Fair

Over: SMALL STREAM

091082602, Fayette, IA

Built 2022 Load: 32.7 t ADT: 44

Showing 6,501-6,550 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.