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

FM

Good

Over: BEAR CREEK

088091608, Buchanan, IA

Built 2006 Load: 36.3 t ADT: 177

IA 110

Good

Over: STORM LAKE INLET

1.3 mi. S of jct. IA 7, Buena Vista, IA

Built 1978 Load: 36.3 t ADT: 4,890

FM

Good

Over: BRANCH BEAVER CREEK

090183104, Butler, IA

Built 1997 Load: 36.3 t ADT: 187

E-60

Good

Over: DEDHAM CREEK

000000000, Carroll, IA

Built 1977 Load: 36.3 t ADT: 311

FM

Good

Over: MIDDLE RACCOON RIVER

084342802, Carroll, IA

Built 2005 Load: 36.3 t ADT: 1,623

N28 690TH ST

Good

Over: WHISTLERS BRANCH

074350302, Cass, IA

Built 2016 Load: 36.3 t ADT: 190

SPRUCE AVE

Good

Over: ROSE CREEK

0.4 Mi N of B15, Cerro Gordo, IA

Built 2014 Load: 36.3 t ADT: 79

CARDINAL

Good

Over: WINNEBAGO RIVER

097220904, Cerro Gordo, IA

Built 1998 Load: 36.3 t ADT: 26

LOCAL

Good

Over: EAST WAPSIPINICON RIVER

095120902, Chickasaw, IA

Built 1990 Load: 36.3 t ADT: 118

290TH ST

Good

Over: MEADOW CREEK

097361301, Clay, IA

Built 2002 Load: 36.3 t ADT: 35

FM

Good

Over: SOLDIER RIVER

085410102, Crawford, IA

Built 1971 Load: 36.3 t ADT: 219

S GRAND PRAIRIE

Good

Over: RACCOON RIVER

West Des Moines, Dallas, IA

Built 2018 Load: 36.3 t ADT: 5

LILAC AVE

Good

Over: STREAM

069140104, Davis, IA

Built 2011 Load: 36.3 t ADT: 70

FM 220 AVE

Good

Over: LIME CREEK

087041908, Delaware, IA

Built 1989 Load: 36.3 t ADT: 88

LOCAL 280 AVE

Good

Over: SMALL STREAM

088031802, Delaware, IA

Built 1991 Load: 36.3 t ADT: 33

LOCAL FLOYD RD

Good

Over: BEAR CREEK

089032608, Delaware, IA

Built 1987 Load: 36.3 t ADT: 501

FM 110 AVE

Good

Over: SPRING BRANCH

089062002, Delaware, IA

Built 1992 Load: 36.3 t ADT: 206

RAINBOW RD

Good

Over: O'DELL BRANCH

090041006, Delaware, IA

Built 1990 Load: 36.3 t ADT: 59

LOCAL

Good

Over: DRAINAGE DITCH

094171201, Floyd, IA

Built 1997 Load: 36.3 t ADT: 11

LOCAL

Good

Over: CREEK

095152601, Floyd, IA

Built 1991 Load: 36.3 t ADT: 29

LOCAL

Good

Over: DRAINAGE

096163105, Floyd, IA

Built 1992 Load: 36.3 t ADT: 59

FOOTHILL

Good

Over: FLOOD CREEK

096181302, Floyd, IA

Built 2005 Load: 36.3 t ADT: 49

LOCAL ROAD

Good

Over: BRANCH OF HAMMERS CREEK

089150201, Grundy, IA

Built 1999 Load: 36.3 t ADT: 29

1270 200TH ST

Good

Over: WEST BRANCH IA RIVER

095251301, Hancock, IA

Built 2011 Load: 36.3 t ADT: 26

295TH ST

Good

Over: CREEK

086211203, Hardin, IA

Built 2000 Load: 36.3 t ADT: 21

LOCAL

Good

Over: CREEK

087200105, Hardin, IA

Built 2002 Load: 36.3 t ADT: 147

LOCAL

Good

Over: CREEK

087221201, Hardin, IA

Built 2002 Load: 36.3 t ADT: 5

LOCAL

Good

Over: CREEK

088202902, Hardin, IA

Built 1999 Load: 36.3 t ADT: 5

FM

Good

Over: BEAVER CREEK

089213604, Hardin, IA

Built 1996 Load: 36.3 t ADT: 39

280TH ST

Good

Over: WILLOW RIVER

078440401, Harrison, IA

Built 2021 Load: 36.3 t ADT: 60

E 112TH ST S

Good

Over: ELK CREEK

078173106, Jasper, IA

Built 1976 Load: 36.3 t ADT: 60

I80 EB TO US218 SB

Good

Over: LAND

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

Built 2020 Load: 36.3 t ADT: 3,910

NEWPORT RD

Good

Over: CATFISH CREEK

083031204, Jones, IA

Built 2015 Load: 36.3 t ADT: 206

HARD SCRABBLE

Good

Over: SILVER CREEK

086041204, Jones, IA

Built 1992 Load: 36.3 t ADT: 39

I 380 NB

Good

Over: EAST OTTER CREEK

1.3 MI. N of Jct. SR E34, Linn, IA

Built 1983 Load: 36.3 t ADT: 12,850

IA 100 WB

Good

Over: INDIAN CREEK

3.2 MI W OFJCT US151/IA13, Linn, IA

Built 1995 Load: 36.3 t ADT: 11,050

CHERRY AVE

Good

Over: PLUM CREEK

98470602, Lyon, IA

Built 2018 Load: 36.3 t ADT: 90

210TH ST

Good

Over: PLUM CREEK

098480101, Lyon, IA

Built 2018 Load: 36.3 t ADT: 11

210TH ST

Good

Over: PLUM CREEK

098480101, Lyon, IA

Built 2018 Load: 36.3 t ADT: 11

FM

Good

Over: MIDDLE CREEK

076143306, Mahaska, IA

Built 1991 Load: 36.3 t ADT: 320

G62 PIERCE DR

Good

Over: WALNUT CREEK

075182803, Marion, IA

Built 2021 Load: 36.3 t ADT: 70

E18 MARBLE RD

Good

Over: STREAM

085180905, Marshall, IA

Built 2015 Load: 36.3 t ADT: 530

245TH ST

Good

Over: JORDAN CREEK

083431503, Monona, IA

Built 2016 Load: 36.3 t ADT: 11

DOUGLAS AVE

Good

Over: PIKE DRAINAGE DITCH

077040306, Muscatine, IA

Built 2021 Load: 36.3 t ADT: 91

LOCAL

Good

Over: JT DD#3

098390102, Osceola, IA

Built 2003 Load: 36.3 t ADT: 46

LOCAL

Good

Over: RAT CREEK

098420402, Osceola, IA

Built 2005 Load: 36.3 t ADT: 26

LOCAL

Good

Over: STREAM RUSH LAKE OUTLET

099402301, Osceola, IA

Built 2004 Load: 36.3 t ADT: 164

LOCAL

Good

Over: STREAM

100403401, Osceola, IA

Built 2005 Load: 36.3 t ADT: 11

200TH ST

Good

Over: SMALL STREAM

092452703, Plymouth, IA

Built 1985 Load: 36.3 t ADT: 159

YORK ROAD

Good

Over: POTATO CREEK

077430101, Pottawattamie, IA

Built 2005 Load: 36.3 t ADT: 51

Showing 13,151-13,200 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.