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

US 63 NB

Good

Over: JEFFERSON PARK DD

1.0 mi. S of W jct US 34, Wapello, IA

Built 2020 Load: 32.4 t ADT: 2,850

US 65 & 69

Good

Over: SOUTH RIVER

2.0 MILES SOUTH OF IA 92, Warren, IA

Built 2016 Load: 32.4 t ADT: 5,400

US 65 & 69 NB

Good

Over: MIDDLE RIVER

0.4 mi. S of Jct. SR G-24, Warren, IA

Built 2016 Load: 32.4 t ADT: 8,950

US 65 & 69 SB

Good

Over: NORTH RIVER

1.3 mi. S of IA 5, Warren, IA

Built 2013 Load: 32.4 t ADT: 10,050

NB I-35

Good

Over: SOUTH RIVER

1.7 mi. N of Jct. SR G26, Warren, IA

Built 2011 Load: 32.4 t ADT: 9,950

SB I-35

Good

Over: SOUTH RIVER

1.7 mi. N of Jct. SR G-26, Warren, IA

Built 2012 Load: 32.4 t ADT: 9,950

I 35 NB

Good

Over: MIDDLE RIVER

0.4 MILES SOUTH OF IA 92, Warren, IA

Built 2014 Load: 32.4 t ADT: 11,400

I 35 SB

Good

Over: MIDDLE RIVER

0.4 MILES SOUTH OF IA 92, Warren, IA

Built 2017 Load: 32.4 t ADT: 11,400

I 35 NB

Good

Over: NORTH RIVER

3.8 MI N OF IA. 92, Warren, IA

Built 2014 Load: 32.4 t ADT: 12,350

I 35 SB

Good

Over: NORTH RIVER

3.8 MI N OF IA 92, Warren, IA

Built 2014 Load: 32.4 t ADT: 12,350

I 35 NB

Good

Over: BADGER CREEK

1.9 Mi. S of SR G-14, Warren, IA

Built 2016 Load: 32.4 t ADT: 12,350

I 35 SB

Good

Over: BADGER CREEK

1.9 Mi. S of SR G-14, Warren, IA

Built 2014 Load: 32.4 t ADT: 12,350

190TH

Good

Over: NORTH WOLF CREEK

074220702, Warren, IA

Built 2017 Load: 32.4 t ADT: 79

G76

Good

Over: OTTER CREEK

074233003, Warren, IA

Built 2017 Load: 32.4 t ADT: 338

R73 138TH AVE

Good

Over: OTTER CREEK

074233004, Warren, IA

Built 2018 Load: 32.4 t ADT: 46

R45

Good

Over: BROADHORN CREEK

074250302, Warren, IA

Built 2018 Load: 32.4 t ADT: 747

R45

Good

Over: S RIVER

074251004, Warren, IA

Built 2018 Load: 32.4 t ADT: 747

MCKINLEY ST

Good

Over: COAL CREEK

075220801, Warren, IA

Built 2015 Load: 32.4 t ADT: 50

210TH AVE

Good

Over: FLANK CREEK

075222802, Warren, IA

Built 2016 Load: 32.4 t ADT: 40

220TH AVE

Good

Over: BRANCH FLANK CREEK

075223406, Warren, IA

Built 2018 Load: 32.4 t ADT: 30

30TH AVE

Good

Over: PAINTER CREEK

075252102, Warren, IA

Built 2020 Load: 32.4 t ADT: 30

180TH AVE

Good

Over: BR SHORT CREEK

076231302, Warren, IA

Built 2017 Load: 32.4 t ADT: 70

168TH AVE

Good

Over: SOUTH RIVER

076233404, Warren, IA

Built 2014 Load: 32.4 t ADT: 190

R63 98TH AVE

Good

Over: MIDDLE RIVER

076240404, Warren, IA

Built 2015 Load: 32.4 t ADT: 2,641

R 57

Good

Over: MIDDLE RIVER

076240804, Warren, IA

Built 2011 Load: 32.4 t ADT: 1,136

HOOVER ST

Good

Over: CAVITT CREEK

076241403, Warren, IA

Built 2016 Load: 32.4 t ADT: 238

KIRKWOOD ST

Good

Over: BR MIDDLE RIVER

076253303, Warren, IA

Built 2019 Load: 32.4 t ADT: 45

168TH AVE

Good

Over: BUTCHER CREEK

077233404, Warren, IA

Built 2019 Load: 32.4 t ADT: 100

CLOVER HILL DR

Good

Over: MID SOUTH CREEK

077241000, Warren, IA

Built 2017 Load: 32.4 t ADT: 135

115TH AVE

Good

Over: MIDDLE RIVER

077243504, Warren, IA

Built 2017 Load: 32.4 t ADT: 110

R35 10TH AVE

Good

Over: BRANCH BADGER CREEK

077253002, Warren, IA

Built 2021 Load: 32.4 t ADT: 319

DUBUQUE PLACE

Good

Over: BRANCH MIDDLE RIVER

077232103, Warren, IA

Built 2019 Load: 32.4 t ADT: 89

COUNTY LINE ROAD

Good

Over: CREEK

078243200, Warren, IA

Built 2019 Load: 32.4 t ADT: 340

US 218 SB

Good

Over: E FORK CROOKED CREEK

1.1 mi. S of jct. SR G62, Washington, IA

Built 2014 Load: 32.4 t ADT: 6,400

IA 1

Good

Over: WEST FORK CROOKED CREEK

1.2 miles South of IA 92, Washington, IA

Built 2016 Load: 32.4 t ADT: 2,600

IA 1

Good

Over: CAMP CREEK

3.1 MI. S OF JCT. IA 22, Washington, IA

Built 2019 Load: 32.4 t ADT: 4,120

IA 22

Good

Over: SALVESEN CREEK

0.2 MI. E OF JCT. IA 1, Washington, IA

Built 2017 Load: 32.4 t ADT: 6,200

IA 92

Good

Over: W BRANCH CROOKED CREEK

2.6 Mi. W of W Jct. IA 1, Washington, IA

Built 2011 Load: 32.4 t ADT: 2,380

W62 REDWOOD AVE

Good

Over: SMALL STREAM

074073608, Washington, IA

Built 2013 Load: 32.4 t ADT: 380

G 38

Good

Over: W FORK CROOKED CREEK

075082401, Washington, IA

Built 2011 Load: 32.4 t ADT: 970

275TH ST

Good

Over: DUTCH CREEK

075093305, Washington, IA

Built 2018 Load: 32.4 t ADT: 30

130TH STREET

Good

Over: SMITH CREEK

077081905, Washington, IA

Built 2021 Load: 32.4 t ADT: 150

J54

Good

Over: STREAM

067200301, Wayne, IA

Built 2015 Load: 32.4 t ADT: 80

CEDAR

Good

Over: SHANCTON CREEK

067221601, Wayne, IA

Built 2016 Load: 32.4 t ADT: 26

HOWE

Good

Over: EAT FORK MEDICINE

068222403, Wayne, IA

Built 2014 Load: 32.4 t ADT: 20

S16 (80TH ST)

Good

Over: DICK CREEK

069221702, Wayne, IA

Built 2014 Load: 32.4 t ADT: 60

SUMMIT ROAD

Good

Over: WALKER CREEK

070202601, Wayne, IA

Built 2023 Load: 32.4 t ADT: 30

110TH ST

Good

Over: SOUTH CHARITON

070223504, Wayne, IA

Built 2018 Load: 32.4 t ADT: 34

65TH ST

Good

Over: NINE MILE CREEK

070233604, Wayne, IA

Built 2018 Load: 32.4 t ADT: 5

80TH

Good

Over: SMALL STREAM

070221808, Wayne, IA

Built 2018 Load: 32.4 t ADT: 26

Showing 11,001-11,050 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.