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

Structurally Deficient

Over: LITTLE CEDAR CREEK

092343201, Pocahontas, IA

Built 1953 ADT: 30

FM SW MCKINLEY

Structurally Deficient

Over: FRINK CREEK

078252500, Polk, IA

Built 1937 ADT: 245

432ND STREET

Structurally Deficient

Over: JORDAN CREEK

074391704, Pottawattamie, IA

Built 1968 ADT: 15

INCA LANE

Structurally Deficient

Over: PIGEON CREEK

076443403, Pottawattamie, IA

Built 1924 ADT: 11

F62

Structurally Deficient

Over: SUGAR CREEK

078160707, Poweshiek, IA

Built 1958 ADT: 1,170

LOCAL

Structurally Deficient

Over: STREAM

078150803, Poweshiek, IA

Built 1959 ADT: 11

LOCAL

Structurally Deficient

Over: STREAM

078162706, Poweshiek, IA

Built 1953 ADT: 60

LOCAL

Structurally Deficient

Over: STREAM

079130701, Poweshiek, IA

Built 1974 ADT: 30

LOCAL

Structurally Deficient

Over: STREAM

079141604, Poweshiek, IA

Built 1952 ADT: 60

LOCAL

Structurally Deficient

Over: STREAM

079142601, Poweshiek, IA

Built 1968 ADT: 30

LOCAL

Structurally Deficient

Over: N ENGLISH RIVER

079151502, Poweshiek, IA

Built 1955 ADT: 45

LOCAL

Structurally Deficient

Over: BUCK CREEK

079162701, Poweshiek, IA

Built 1965 ADT: 60

370TH AVE

Structurally Deficient

Over: STONY CREEK

080141003, Poweshiek, IA

Built 1967 ADT: 40

LOCAL

Structurally Deficient

Over: SMALL STREAM

081131202, Poweshiek, IA

Built 1950 ADT: 34

FM

Structurally Deficient

Over: WALNUT CREEK

081152002, Poweshiek, IA

Built 1928 ADT: 15

LOCAL

Structurally Deficient

Over: STREAM

067282201, Ringgold, IA

Built 1953 ADT: 5

LOCAL

Structurally Deficient

Over: LOTTS CREEK

067291204, Ringgold, IA

Built 1961 ADT: 11

LOCAL

Structurally Deficient

Over: M FK GRAND RIVER

067300903, Ringgold, IA

Built 1963 ADT: 20

LOCAL

Structurally Deficient

Over: STREAM

067312503, Ringgold, IA

Built 1957 ADT: 11

LOCAL

Structurally Deficient

Over: LOTTS CREEK

068280601, Ringgold, IA

Built 1940 ADT: 11

LOCAL

Structurally Deficient

Over: E FK GRAND RIVER

068291501, Ringgold, IA

Built 1962 ADT: 5

LOCAL

Structurally Deficient

Over: W FK GRAND RIVER

068301903, Ringgold, IA

Built 1940 ADT: 5

FM

Structurally Deficient

Over: OVER UP RR

068311404, Ringgold, IA

Built 1940 ADT: 379

LOCAL

Structurally Deficient

Over: LOTTS CREEK

069280401, Ringgold, IA

Built 1952 ADT: 5

LOCAL

Structurally Deficient

Over: LOTTS CREEK

069280901, Ringgold, IA

Built 1949 ADT: 5

LOCAL

Structurally Deficient

Over: GOOSEBERRY CREEK

069290901, Ringgold, IA

Built 1956 ADT: 5

200TH ST

Structurally Deficient

Over: GOOSEBERRY CREEK

069292701, Ringgold, IA

Built 1940 ADT: 20

FM

Structurally Deficient

Over: E FK GRAND RIVER

069293505, Ringgold, IA

Built 1958 ADT: 15

LOCAL

Structurally Deficient

Over: STREAM

069301201, Ringgold, IA

Built 1930 ADT: 15

LOCAL

Structurally Deficient

Over: STREAM

069301302, Ringgold, IA

Built 1952 ADT: 5

190TH ST

Structurally Deficient

Over: CROOKED CREEK

069302301, Ringgold, IA

Built 1942 ADT: 29

LOCAL

Structurally Deficient

Over: STREAM

069311704, Ringgold, IA

Built 1956 ADT: 5

FM

Structurally Deficient

Over: TURKEY CREEK

069312001, Ringgold, IA

Built 1964 ADT: 26

FM

Structurally Deficient

Over: WOLF CREEK

069312401, Ringgold, IA

Built 1957 ADT: 34

FM

Structurally Deficient

Over: STREAM

070283601, Ringgold, IA

Built 1968 ADT: 349

FM

Structurally Deficient

Over: E FK GRAND RIVER

070290101, Ringgold, IA

Built 1960 ADT: 29

LOCAL

Structurally Deficient

Over: STREAM

070290602, Ringgold, IA

Built 1954 ADT: 5

LOCAL

Structurally Deficient

Over: STREAM

070291501, Ringgold, IA

Built 1943 ADT: 11

LOCAL

Structurally Deficient

Over: STREAM

070311101, Ringgold, IA

Built 1960 ADT: 20

LOCAL

Structurally Deficient

Over: STREAM

070312902, Ringgold, IA

Built 1950 ADT: 5

LOCAL

Structurally Deficient

Over: SMALL STREAM

086372303, Sac, IA

Built 1952 ADT: 15

LOCAL ROAD

Structurally Deficient

Over: DRAINAGE

086382501, Sac, IA

Built 1964 ADT: 30

LOCAL

Structurally Deficient

Over: SMALL STREAM

086383201, Sac, IA

Built 1986 ADT: 26

FM

Structurally Deficient

Over: RACCOON RIVER

087353504, Sac, IA

Built 1921 ADT: 45

LOCAL

Structurally Deficient

Over: STREAM

088372102, Sac, IA

Built 1956 ADT: 20

LOCAL

Structurally Deficient

Over: INDIAN CREEK

088373601, Sac, IA

Built 1962 ADT: 34

LOCAL

Structurally Deficient

Over: SMALL STREAM

088381802, Sac, IA

Built 1951 ADT: 20

LOCAL

Structurally Deficient

Over: STREAM

089352202, Sac, IA

Built 1966 ADT: 11

LOCAL

Structurally Deficient

Over: STREAM

089370602, Sac, IA

Built 1962 ADT: 20

LOCAL

Structurally Deficient

Over: INDIAN CREEK

079373504, Shelby, IA

Built 1926 ADT: 35

Showing 19,701-19,750 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.