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

BOONEVILLE RD

Good

Over: SUGAR CREEK

City of West Des Moines, Dallas, IA

Built 2018 Load: 33.7 t ADT: 70

ICE AVE

Good

Over: TRIB TO CARTERS CREEK

068142912, Davis, IA

Built 2013 Load: 33.7 t ADT: 30

DRY HOLLOW RD

Good

Over: CREEK

089013305, Dubuque, IA

Built 2013 Load: 33.7 t ADT: 20

LOCAL

Good

Over: STREAM

094151801, Floyd, IA

Built 1981 Load: 33.7 t ADT: 168

D55 (290TH ST)

Good

Over: BRANCH WOLF CREEK

86171101, Grundy, IA

Built 2013 Load: 33.7 t ADT: 44

120TH ST

Good

Over: N FORK BEAVER CREEK

089181501, Grundy, IA

Built 2016 Load: 33.7 t ADT: 29

REDWOOD AVE

Good

Over: STREAM

080310102, Guthrie, IA

Built 2018 Load: 33.7 t ADT: 34

E17 150TH ST

Good

Over: JESSIE BRANCH

085E32407, Jackson, IA

Built 2018 Load: 33.7 t ADT: 540

US 52

Good

Over: CP RR/MILL CREEK

0.3 mi. S of Jct. IA 62, Jackson, IA

Built 2009 Load: 33.7 t ADT: 2,640

IA 14

Good

Over: BENJAMAN CREEK

0.5 MILE N OF JCT SR F36, Jasper, IA

Built 1988 Load: 33.7 t ADT: 2,100

S 12TH AVE E

Good

Over: TURNER CREEK

079170401, Jasper, IA

Built 2014 Load: 33.7 t ADT: 35

W 60TH ST S

Good

Over: WARREN GROVE CREEK

079203302, Jasper, IA

Built 2014 Load: 33.7 t ADT: 20

N 107TH AVE E

Good

Over: ALLOWAY CREEK

081181001, Jasper, IA

Built 2014 Load: 33.7 t ADT: 30

CAMP CARDINAL R

Good

Over: CLEAR CREEK

000000000, Johnson, IA

Built 1984 Load: 33.7 t ADT: 9,800

LOC 150TH ST

Good

Over: E FORK DES MOINES RIVER

094291105, Kossuth, IA

Built 1992 Load: 33.7 t ADT: 26

140TH AVE

Good

Over: FIVE MILE CREEK

071233502, Lucas, IA

Built 2014 Load: 33.7 t ADT: 45

FM

Good

Over: KANARANZI CREEK

100452201, Lyon, IA

Built 1980 Load: 33.7 t ADT: 100

STORY DR

Good

Over: STREAM

074191003, Marion, IA

Built 2014 Load: 33.7 t ADT: 15

LOCAL

Good

Over: SOLDIER RIVER

082433003, Monona, IA

Built 1992 Load: 33.7 t ADT: 45

LOCAL

Good

Over: CRAPABLE TREE

073393502, Montgomery, IA

Built 2000 Load: 33.7 t ADT: 5

150TH ST

Good

Over: LITTLE MOSQUITO CREEK

078013101, Muscatine, IA

Built 2023 Load: 33.7 t ADT: 30

IA 60 NB

Good

Over: WAGNER CREEK

0.3 mi. N of Jct. SR A34, Osceola, IA

Built 2003 Load: 33.7 t ADT: 5,400

290TH STREET

Good

Over: MIDDLE TARKIO RIVER

067381701, Page, IA

Built 2002 Load: 33.7 t ADT: 40

320TH STREET

Good

Over: TARKIO RIVER

067383201, Page, IA

Built 2001 Load: 33.7 t ADT: 29

280TH STREET

Good

Over: WEST TARKIO CREEK

067390901, Page, IA

Built 2000 Load: 33.7 t ADT: 15

300TH STREET

Good

Over: WEST TARKIO CREEK

067392001, Page, IA

Built 1992 Load: 33.7 t ADT: 20

230TH STREET

Good

Over: WEST TARKIO RIVER

068391401, Page, IA

Built 1993 Load: 33.7 t ADT: 34

J-35 / 210 ST

Good

Over: EAST NODAWAY RIVER

069363501, Page, IA

Built 1993 Load: 33.7 t ADT: 100

190TH ST

Good

Over: CLEAR CREEK

9243200110, Plymouth, IA

Built 2018 Load: 33.7 t ADT: 60

FM K-64

Good

Over: DEEP CREEK

092440406, Plymouth, IA

Built 1982 Load: 33.7 t ADT: 938

IA 415

Good

Over: DRAINAGE DITCH

0.5 MI. S OF JCT. IA 160, Polk, IA

Built 1983 Load: 33.7 t ADT: 27,000

TEAKWOOD ROAD

Good

Over: PIGEON CREEK

077421901, Pottawattamie, IA

Built 1982 Load: 33.7 t ADT: 50

LOCAL

Good

Over: STREAM

080163001, Poweshiek, IA

Built 2006 Load: 33.7 t ADT: 100

I 74 WB

Good

Over: MISSISSIPPI RIVER

IN BETTENDORF, Scott, IA

Built 2020 Load: 33.7 t ADT: 37,650

60TH AVE

Good

Over: CREEK

078E20704, Scott, IA

Built 2022 Load: 33.7 t ADT: 100

370TH ST

Good

Over: NO NAME CREEK

096452701, Sioux, IA

Built 1965 Load: 33.7 t ADT: 988

FM

Good

Over: STREAM

096471101, Sioux, IA

Built 1960 Load: 33.7 t ADT: 210

L 22

Good

Over: SMALL

097433402, Sioux, IA

Built 2004 Load: 33.7 t ADT: 270

590TH AVE

Good

Over: OVRFLW OF MILFORD 13

0.33 Mi. S of NW Co., Story, IA

Built 2017 Load: 33.7 t ADT: 45

E29/190TH ST

Good

Over: WEST BR INDIAN CREEK

084232301, Story, IA

Built 2005 Load: 33.7 t ADT: 1,217

690TH AVE

Good

Over: MIDDLE MINERVA CREEK

0.3 Mi S E18, Story, IA

Built 2020 Load: 33.7 t ADT: 11

550TH AVE

Good

Over: HAMILTON-STORY 1 OPEN DD

1.5 miles S of E18, Story, IA

Built 2015 Load: 33.7 t ADT: 80

I 35

Good

Over: SOUTH SKUNK RVR OVERFLOW

1.9 mi. S of US 30, Story, IA

Built 2017 Load: 33.7 t ADT: 46,600

IA 14

Good

Over: WILDCAT CREEK

2.0 MI. N OF IA #2, Wayne, IA

Built 1989 Load: 33.7 t ADT: 2,110

LOCAL

Good

Over: SMALL CREEK

097081603, Winneshiek, IA

Built 1981 Load: 33.7 t ADT: 39

LOCAL RD

Good

Over: CREEK

097100904, Winneshiek, IA

Built 1996 Load: 33.7 t ADT: 20

CATTLE CREEK RD

Good

Over: UPPER IOWA RIVER

0.7 Mi E of 290 Av, Winneshiek, IA

Built 2019 Load: 33.7 t ADT: 29

275TH ST

Good

Over: UNNAMED CREEK

0.1 MI W of 310th Ave, Winneshiek, IA

Built 2019 Load: 33.7 t ADT: 26

200TH ST

Good

Over: STREAM

088422501, Woodbury, IA

Built 2018 Load: 33.7 t ADT: 15

LOCAL ROAD

Good

Over: IOWA RIVER

092233310, Wright, IA

Built 1995 Load: 33.7 t ADT: 46

Showing 12,501-12,550 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.