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

300TH ST

Good

Over: SMALL STREAM

087381701, Sac, IA

Built 2019 Load: 32.4 t ADT: 30

M43 GARD AVE

Good

Over: STREAM

089372804, Sac, IA

Built 2017 Load: 32.4 t ADT: 559

M43 GARD AVE

Good

Over: STREAM

089372802, Sac, IA

Built 2017 Load: 32.4 t ADT: 559

US 20 WB US 71 NB

Good

Over: NORTH RACCOON RIVER

1.0 mi. W of Jct. SR M54, Sac, IA

Built 2012 Load: 32.4 t ADT: 3,300

US 20 WB

Good

Over: CEDAR CREEK

2.5 mi. E of SR N14, Sac, IA

Built 2012 Load: 32.4 t ADT: 2,950

US 20 WB

Good

Over: BOYER RIVER

1.9 MILES WEST OF US 71, Sac, IA

Built 2017 Load: 32.4 t ADT: 2,425

IA 22

Good

Over: STREAM

0.1 MI. W OF JCT. SR Y40, Scott, IA

Built 2015 Load: 32.4 t ADT: 1,560

1ST AVE

Good

Over: CREEK

079E13002, Scott, IA

Built 2015 Load: 32.4 t ADT: 120

230TH ST

Good

Over: CREEK

079E32001, Scott, IA

Built 2016 Load: 32.4 t ADT: 50

260TH AVE

Good

Over: CREEK

080E52802, Scott, IA

Built 2015 Load: 32.4 t ADT: 100

VETERANS MEM PKWY

Good

Over: CROW CREEK

078040596, Scott, IA

Built 2017 Load: 32.4 t ADT: 2,905

I 280 WB US 61 NB

Good

Over: DUCK CREEK

2.5 MI. S OF US 6, Scott, IA

Built 2015 Load: 32.4 t ADT: 11,750

IA 12

Good

Over: SIX MILE CREEK

2.1 mi. N of SR C12, Sioux, IA

Built 2013 Load: 32.4 t ADT: 1,120

LOCAL

Good

Over: SMALL STREAM

095452903, Sioux, IA

Built 1998 Load: 32.4 t ADT: 45

I 35 NB

Good

Over: SOUTH SKUNK RIVER

2.6 MILES S OF JCT US 30, Story, IA

Built 2018 Load: 32.4 t ADT: 23,300

I 35 SB

Good

Over: SOUTH SKUNK RIVER

2.6 MI. S OF Jct. U.S. 30, Story, IA

Built 2017 Load: 32.4 t ADT: 23,300

I35 NB TO US 30 EB

Good

Over: DRAINAGE DITCH

AT JCT. US 30, Story, IA

Built 2017 Load: 32.4 t ADT: 1,420

290TH ST

Good

Over: DRAINAGE DITCH

0.4 Mi E of US Hwy 69, Story, IA

Built 2019 Load: 32.4 t ADT: 120

US 30 EB

Good

Over: OTTER CREEK

6.0 Mi. E OF US 63, Tama, IA

Built 2019 Load: 32.4 t ADT: 3,250

E44 1ST ST

Good

Over: TROUBLESOME CREEK

083131301, Tama, IA

Built 2015 Load: 32.4 t ADT: 519

380TH ST

Good

Over: IOWA RIVER

082132606, Tama, IA

Built 2017 Load: 32.4 t ADT: 49

280TH ST

Good

Over: BRANCH IOWA RIVER

083150401, Tama, IA

Built 2017 Load: 32.4 t ADT: 15

230TH ST

Good

Over: EAST BRANCH SALT CREEK

084131001, Tama, IA

Built 2014 Load: 32.4 t ADT: 44

M AVE

Good

Over: WOLF CREEK

085140702, Tama, IA

Built 2021 Load: 32.4 t ADT: 26

M AVE

Good

Over: FOUR MILE CREEK

085140702, Tama, IA

Built 2021 Load: 32.4 t ADT: 26

ABBOTT AVE

Good

Over: DEVILS RUN

085160702, Tama, IA

Built 2017 Load: 32.4 t ADT: 26

130TH ST

Good

Over: TWELVE MILE CREEK

086142303, Tama, IA

Built 2017 Load: 32.4 t ADT: 44

380TH ST

Good

Over: POND NEAR IOWA RIVER

08213260303, Tama, IA

Built 2017 Load: 32.4 t ADT: 49

US 30 WB

Good

Over: OTTER CREEK

6.0 MI. E OF US 63, Tama, IA

Built 2019 Load: 32.4 t ADT: 3,250

US 30 WB

Good

Over: SALT CREEK

0.9 Mi. W of IA 21, Tama, IA

Built 2019 Load: 32.4 t ADT: 6,500

US 30 EB

Good

Over: IOWA RIVER EAST OVERFLOW

0.6 MI. W OF CO. RD. T47, Tama, IA

Built 2020 Load: 32.4 t ADT: 5,850

US 30 WB

Good

Over: IOWA RIVER EAST OVERFLOW

0.6 MI. W. OF CO. RD. T47, Tama, IA

Built 2021 Load: 32.4 t ADT: 5,850

FM

Good

Over: SMALL

067330107, Taylor, IA

Built 2010 Load: 32.4 t ADT: 15

H29 168TH ST

Good

Over: FOUR MILE CREEK

072280150, Union, IA

Built 2015 Load: 32.4 t ADT: 40

170TH ST

Good

Over: TWO MILE CREEK

072291103, Union, IA

Built 2021 Load: 32.4 t ADT: 46

IA 2

Good

Over: DES MOINES RIVER

0.2 mi. E of Jct. IA 81, Van Buren, IA

Built 2012 Load: 32.4 t ADT: 1,440

V64

Good

Over: DES MOINES RIVER

1.5 MILES S. OF IA 16, Van Buren, IA

Built 2016 Load: 32.4 t ADT: 1,100

LOCAL

Good

Over: HOLCOMB CREEK

070113504, Van Buren, IA

Built 2001 Load: 32.4 t ADT: 40

US 34

Good

Over: BEAR CREEK

2.1 MI. W of JCT. IA 149, Wapello, IA

Built 2016 Load: 32.4 t ADT: 6,800

IA 149

Good

Over: CEDAR CREEK

2.2 MILES SOUTH OF IA 23, Wapello, IA

Built 2018 Load: 32.4 t ADT: 4,510

118TH AVE

Good

Over: VILLAGE CREEK

071130808, Wapello, IA

Built 2015 Load: 32.4 t ADT: 196

POINT ISABELLE

Good

Over: VILLAGE CREEK

071141404, Wapello, IA

Built 2013 Load: 32.4 t ADT: 110

100TH ST

Good

Over: BUCKEYE CREEK

072122101, Wapello, IA

Built 2014 Load: 32.4 t ADT: 41

H25 DAHLONEGA RD

Good

Over: CEDAR CREEK

072130301, Wapello, IA

Built 2014 Load: 32.4 t ADT: 380

DAHLONEGA RD

Good

Over: BR CEDAR CREEK

072130406, Wapello, IA

Built 2012 Load: 32.4 t ADT: 380

200TH AVE

Good

Over: SOUTH AVERY CREEK

072150102, Wapello, IA

Built 2020 Load: 32.4 t ADT: 62

118TH AVE

Good

Over: CEDAR CREEK

073131704, Wapello, IA

Built 2019 Load: 32.4 t ADT: 35

225TH AVE

Good

Over: NORTH AVERY CREEK

073153304, Wapello, IA

Built 2021 Load: 32.4 t ADT: 73

CHILLICOTHE RD

Good

Over: BNSF RR

000000000, Wapello, IA

Built 2011 Load: 32.4 t ADT: 1,300

CHILLICOTHE RD

Good

Over: DES MOINES RIVER

073152507, Wapello, IA

Built 2011 Load: 32.4 t ADT: 1,300

Showing 10,951-11,000 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.