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

78TH ST

Good

Over: SILVER CREEK

099111103, Howard, IA

Built 2013 Load: 32.4 t ADT: 30

FIR AVE

Good

Over: CRANE CREEK

099140102, Howard, IA

Built 2012 Load: 32.4 t ADT: 29

V36 OAK AVE

Good

Over: UPPER IOWA

100122102, Howard, IA

Built 2014 Load: 32.4 t ADT: 393

RIVER RD

Good

Over: BRANCH UPPER IOWA RIVER

100130703, Howard, IA

Built 2015 Load: 32.4 t ADT: 59

40TH ST

Good

Over: BEAVER CREEK

100132701, Howard, IA

Built 2020 Load: 32.4 t ADT: 73

40TH ST

Good

Over: BEAVER CREEK

100132803, Howard, IA

Built 2020 Load: 32.4 t ADT: 73

V10 DALE AVE

Good

Over: STAFF CREEK

100142702, Howard, IA

Built 2022 Load: 32.4 t ADT: 707

ROBIN AVE

Good

Over: N BRANCH TURKEY RIVER

099121302, Howard, IA

Built 2012 Load: 32.4 t ADT: 135

180TH ST

Good

Over: WAPSIPINICON RIVER

097140601, Howard, IA

Built 2019 Load: 32.4 t ADT: 21

M15 JASPER AVE

Good

Over: SOLDIER RIVER

086402302, Ida, IA

Built 2015 Load: 32.4 t ADT: 439

220TH AVE

Good

Over: ELK CREEK

087390201, Ida, IA

Built 2014 Load: 32.4 t ADT: 21

D15 125TH ST

Good

Over: BITTER CREEK

089411805, Ida, IA

Built 2020 Load: 32.4 t ADT: 100

US 20 WB

Good

Over: FRITZ CREEK

3.4 mi E of jct US 59, Ida, IA

Built 2017 Load: 32.4 t ADT: 2,550

US 20 WB

Good

Over: MAPLE RIVER

4.1 MI. E. OF E. JCT. 59, Ida, IA

Built 2017 Load: 32.4 t ADT: 2,550

US 151

Good

Over: MILL RACE CREEK

0.4 mi. S of Jct. 220, Iowa, IA

Built 2011 Load: 32.4 t ADT: 5,500

S AVE

Good

Over: BR ENGLISH RIVER

078093102, Iowa, IA

Built 2018 Load: 32.4 t ADT: 50

FM

Good

Over: DEEP RIVER

078120504, Iowa, IA

Built 2009 Load: 32.4 t ADT: 250

POWESHIEK IOWA

Good

Over: NORTH ENGLISH RIVER

079121902, Iowa, IA

Built 2019 Load: 32.4 t ADT: 26

LOCAL

Good

Over: STREAM

080092202, Iowa, IA

Built 2017 Load: 32.4 t ADT: 50

200TH ST

Good

Over: SMALL STREAM

080092500, Iowa, IA

Built 2020 Load: 32.4 t ADT: 60

F35 210TH ST

Good

Over: OLD MAN'S CREEK

080112600, Iowa, IA

Built 2016 Load: 32.4 t ADT: 90

W 22 U AVE

Good

Over: SMALL STREAM

081090904, Iowa, IA

Built 2015 Load: 32.4 t ADT: 140

BENTON AND IOWA

Good

Over: UNNAMED CREEK

081110503, Iowa, IA

Built 2012 Load: 32.4 t ADT: 60

140TH ST

Good

Over: HONEY CREEK

081122701, Iowa, IA

Built 2015 Load: 32.4 t ADT: 45

F 34 190TH ST

Good

Over: SMALL STREAM

080092301, Iowa, IA

Built 2018 Load: 32.4 t ADT: 20

US 6

Good

Over: UNNAMED STREAM

0.36 MI. W of SR V52, Iowa, IA

Built 2016 Load: 32.4 t ADT: 1,650

US 52 & IA 64

Good

Over: MISSISSIPPI R OVERFLOW

1.8 mi. E US 67, Jackson, IA

Built 2018 Load: 32.4 t ADT: 2,150

100TH AVE

Good

Over: PUMPKIN CREEK

084E23104, Jackson, IA

Built 2021 Load: 32.4 t ADT: 45

525TH AVE

Good

Over: SMALL CREEK

084E63204, Jackson, IA

Built 2021 Load: 32.4 t ADT: 70

I 80 EB

Good

Over: NORTH SKUNK RIVER

2.1 Miles East of IA 224, Jasper, IA

Built 2021 Load: 32.4 t ADT: 14,600

I 80 WB

Good

Over: NORTH SKUNK RIVER

2.1 MI. E. OF IA 224, Jasper, IA

Built 2022 Load: 32.4 t ADT: 14,600

S 126TH AVE E

Good

Over: S SKUNK RIVER

078183203, Jasper, IA

Built 2015 Load: 32.4 t ADT: 51

MEADOW AVE

Good

Over: CHERRY CREEK

079190705, Jasper, IA

Built 2014 Load: 32.4 t ADT: 82

F24

Good

Over: INDIAN CREEK

080210303, Jasper, IA

Built 2020 Load: 32.4 t ADT: 300

N 91ST AVE W

Good

Over: WOLF CREEK

081212001, Jasper, IA

Built 2018 Load: 32.4 t ADT: 11

ASH AVE

Good

Over: CEDAR CREEK

072111804, Jefferson, IA

Built 2014 Load: 32.4 t ADT: 90

ASH AVE

Good

Over: CREEK

072111906, Jefferson, IA

Built 2014 Load: 32.4 t ADT: 90

PEACH AVE

Good

Over: WALNUT CREEK

073092206, Jefferson, IA

Built 2019 Load: 32.4 t ADT: 71

IA 1 NB

Good

Over: RALSTON CREEK

2.3 MI. S. OF I-80, Johnson, IA

Built 2019 Load: 32.4 t ADT: 2,850

I 80 EB

Good

Over: CLEAR CREEK

I-80 / I-380 INTERCHANGE, Johnson, IA

Built 2023 Load: 32.4 t ADT: 13,450

I 80 WB

Good

Over: CLEAR CREEK

I-80 / I-380 INTERCHANGE, Johnson, IA

Built 2022 Load: 32.4 t ADT: 13,450

F46 IWV RD

Good

Over: OLD WOMANS CR

079081401, Johnson, IA

Built 2005 Load: 32.4 t ADT: 480

PRENTISS ST

Good

Over: RALSTON CREEK

079061500, Johnson, IA

Built 2020 Load: 32.4 t ADT: 1,664

I80 WB TO I380 NB

Good

Over: CLEAR CREEK

I-80/I-380/US 218 INTERCH, Johnson, IA

Built 2021 Load: 32.4 t ADT: 13,800

I 380 NB

Good

Over: CLEAR CREEK

0.5 MI. N OF JCT. 80, Johnson, IA

Built 2021 Load: 32.4 t ADT: 18,000

I 380 SB

Good

Over: CLEAR CREEK

I-80 / I-380 INTERCHANGE, Johnson, IA

Built 2022 Load: 32.4 t ADT: 18,000

I 380 NB

Good

Over: IAIS RR

0.7 MI. N OF JCT. I-80, Johnson, IA

Built 2021 Load: 32.4 t ADT: 26,550

I 380 SB

Good

Over: IAIS RR

I-80 / I-380 INTERCHANGE, Johnson, IA

Built 2022 Load: 32.4 t ADT: 26,550

US218 NB TO I80 EB

Good

Over: CLEAR CREEK

I-80/I-380/US 218 INTERCH, Johnson, IA

Built 2021 Load: 32.4 t ADT: 4,830

I380 SB TO I80 EB

Good

Over: CLEAR CREEK

I80/I380 INTERCHANGE, Johnson, IA

Built 2022 Load: 32.4 t ADT: 14,400

Showing 10,701-10,750 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.