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

LOCAL

Poor

Over: SMALL STREAM

073042102, Louisa, IA

Built 1960 Load: 15.1 t ADT: 35

LOCAL RD

Poor

Over: N BR NORTH RIVER

077282204, Madison, IA

Built 1915 Load: 15.1 t ADT: 50

LCL-400TH ST

Poor

Over: INDIAN CREEK

072402602, Mills, IA

Built 1957 Load: 15.1 t ADT: 50

240TH ST

Poor

Over: MUD CREEK

091441801, Plymouth, IA

Built 1900 Load: 15.1 t ADT: 5

LOCAL

Poor

Over: JORDAN CREEK

074390301, Pottawattamie, IA

Built 1948 Load: 15.1 t ADT: 34

FM

Poor

Over: DEEP RIVER

079143207, Poweshiek, IA

Built 1949 Load: 15.1 t ADT: 30

FM

Poor

Over: STREAM

089373502, Sac, IA

Built 1981 Load: 15.1 t ADT: 26

40TH AVE

Poor

Over: CREEK

080E11004, Scott, IA

Built 1972 Load: 15.1 t ADT: 50

LOCAL

Poor

Over: BRANCH SOUTH RIVER

076221008, Warren, IA

Built 1973 Load: 15.1 t ADT: 11

LOCAL

Poor

Over: CREEK

079362201, Audubon, IA

Built 1964 Load: 15.2 t ADT: 30

LOCAL

Poor

Over: CREEK

081351802, Audubon, IA

Built 1933 Load: 15.2 t ADT: 21

LOCAL - WICHITA

Poor

Over: SEVEN MILE CREEK

074362901, Cass, IA

Built 1978 Load: 15.2 t ADT: 11

LOCAL M AVE.

Poor

Over: BR PERRY CREEK

091401802, Cherokee, IA

Built 1928 Load: 15.2 t ADT: 20

FM

Poor

Over: SOAP CREEK

070141904, Davis, IA

Built 1905 Load: 15.2 t ADT: 70

FM-150TH ST

Poor

Over: CRANE CREEK

098132001, Howard, IA

Built 1968 Load: 15.2 t ADT: 579

LOCAL

Poor

Over: CREEK

085E32108, Jackson, IA

Built 1920 Load: 15.2 t ADT: 20

FM

Poor

Over: WATERWAY

077271002, Madison, IA

Built 1955 Load: 15.2 t ADT: 159

LOCAL

Poor

Over: MIDDLE CREEK

076150802, Mahaska, IA

Built 1963 Load: 15.2 t ADT: 40

LOCAL

Poor

Over: ASHER CREEK

084180901, Marshall, IA

Built 1955 Load: 15.2 t ADT: 29

FM

Poor

Over: STREAM

071180203, Monroe, IA

Built 1940 Load: 15.2 t ADT: 70

LOCAL ROAD

Poor

Over: SMALL STREAM

086370801, Sac, IA

Built 1923 Load: 15.2 t ADT: 30

FM

Poor

Over: CREEK

067111601, Van Buren, IA

Built 1966 Load: 15.2 t ADT: 70

LOCAL

Poor

Over: REED'S CR

069083501, Van Buren, IA

Built 1959 Load: 15.2 t ADT: 62

FM

Poor

Over: STREAM

067190501, Appanoose, IA

Built 1953 Load: 15.3 t ADT: 60

LOCAL

Poor

Over: DES MOINES RIVER

082260305, Boone, IA

Built 1930 Load: 15.3 t ADT: 34

LOCAL

Poor

Over: CREEK

089191203, Hardin, IA

Built 1960 Load: 15.3 t ADT: 69

FM-145TH STREET

Poor

Over: DRAINAGE

077440906, Pottawattamie, IA

Built 1959 Load: 15.3 t ADT: 40

LOCAL

Poor

Over: CAVITT CREEK

076241101, Warren, IA

Built 1960 Load: 15.3 t ADT: 26

LOCAL ROAD

Poor

Over: CREEK

099072103, Winneshiek, IA

Built 1900 Load: 15.3 t ADT: 29

LOCAL

Poor

Over: WHITE FOX CREEK

091242902, Wright, IA

Built 1914 Load: 15.3 t ADT: 35

LOCAL

Poor

Over: NORTH WYACONDAH CREEK

067121002, Davis, IA

Built 1914 Load: 15.4 t ADT: 34

130TH ST.

Poor

Over: ALEXANDER CREEK

093083203, Fayette, IA

Built 1950 Load: 15.4 t ADT: 69

GREAT RIVER RD.

Poor

Over: TURKEY RIVER

095073203, Fayette, IA

Built 1953 Load: 15.4 t ADT: 314

322 AVENUE

Poor

Over: MILL CREEK

068413204, Fremont, IA

Built 1957 Load: 15.4 t ADT: 26

FM

Poor

Over: MIDDLE RACOON

079301503, Guthrie, IA

Built 1958 Load: 15.4 t ADT: 45

LOCAL

Poor

Over: BOONE RIVER

089250703, Hamilton, IA

Built 1924 Load: 15.4 t ADT: 26

LOCAL

Poor

Over: BEAVER CREEK

093313301, Pocahontas, IA

Built 1900 Load: 15.4 t ADT: 20

LOCAL

Poor

Over: E FK GRAND RIVER

067292003, Ringgold, IA

Built 1957 Load: 15.4 t ADT: 11

LOCAL

Poor

Over: STREAM

067300401, Ringgold, IA

Built 1949 Load: 15.4 t ADT: 11

578TH AVE

Poor

Over: COON CREEK

082233204, Story, IA

Built 1952 Load: 15.4 t ADT: 50

535TH AVE

Poor

Over: BALLARD CREEK

082241504, Story, IA

Built 1920 Load: 15.4 t ADT: 60

248TH ST

Poor

Over: DYE CREEK

083221303, Story, IA

Built 1939 Load: 15.4 t ADT: 15

LOCAL

Poor

Over: F0UR MILE CREEK

085151201, Tama, IA

Built 1979 Load: 15.4 t ADT: 20

LOCAL

Poor

Over: WALNUT CREEK

069193204, Appanoose, IA

Built 1964 Load: 15.5 t ADT: 21

LOCAL W AVE.

Poor

Over: PITCHER CREEK

091393502, Cherokee, IA

Built 1923 Load: 15.5 t ADT: 11

LOC VICTORY AVE

Poor

Over: UPPER IOWA

100111016, Howard, IA

Built 1950 Load: 15.5 t ADT: 393

LOC 50TH AVE

Poor

Over: DRAINAGE DITCH 79

094301102, Kossuth, IA

Built 1965 Load: 15.5 t ADT: 11

140TH ST

Poor

Over: INDIAN CREEK

093473001, Plymouth, IA

Built 1956 Load: 15.5 t ADT: 20

FM

Poor

Over: E FORK GRAND RIVER

070293601, Ringgold, IA

Built 1957 Load: 15.5 t ADT: 29

240TH ST

Poor

Over: CREEK

091141701, Bremer, IA

Built 1929 Load: 15.6 t ADT: 196

Showing 17,301-17,350 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.