State profile · Above median Poor share

Iowa bridge safety

Condition ratings, load ratings, and Poor-condition data for every public highway bridge in Iowa, based on the FHWA National Bridge Inventory.

20,753
Public bridges
36.5%
Good condition
20.0%
Poor condition

Data updated May 2026

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 whose lowest applicable component is rated 0-4

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 - Poor-condition share 66.7%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.

Condition Distribution

Iowa38.5%40.4%21.1%GoodFairPoor
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 by Poor-condition share (lower share = better)

States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below Iowa on the same metric.

WV

West Virginia

16.02% top marginal rate
Structure
Progressive
Burden @ $100K
$7,679

SD

South Dakota

16.24% top marginal rate
Structure
Progressive
Burden @ $100K
$5,905
Selected

IA

Iowa

20.01% top marginal rate
Structure
Progressive
Burden @ $100K
$20,753

VI

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 the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.

270TH STREET

Poor

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

Poor

Over: MUD CREEK

87-12-15-02-10, Black Hawk, IA

Built 1948 Load: 2.7 t ADT: 11

LOCAL - 700TH

Poor

Over: TRIB TROUBLESOME CREEK

077351402, Cass, IA

Built 1983 Load: 2.7 t ADT: 11

LOCAL - DAYTONA

Poor

Over: BUCK CREEK

077361903, Cass, IA

Built 1980 Load: 2.7 t ADT: 35

100TH ST.

Poor

Over: UNION CREEK

083E20101, Clinton, IA

Built 1900 Load: 2.7 t ADT: 78

All Bridges in Iowa

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

LOCAL

Poor

Over: BRANCH WOLF CREEK

086171201, Grundy, IA

Built 1956 Load: 15.4 t ADT: 30

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

FM

Poor

Over: PLUM CREEK

070301702, Ringgold, IA

Built 1954 Load: 15.4 t ADT: 120

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

K AVENUE

Poor

Over: STREAM

070380104, Page, IA

Built 1999 Load: 15.5 t ADT: 5

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

FM

Poor

Over: PLATTE RIVER

070310401, Ringgold, IA

Built 1955 Load: 15.5 t ADT: 60

240TH ST

Poor

Over: CREEK

091141701, Bremer, IA

Built 1929 Load: 15.6 t ADT: 196

LOCAL - QUEBEC

Poor

Over: SEVEN MILE CREEK

075352903, Cass, IA

Built 1981 Load: 15.6 t ADT: 26

GRANT AVE

Poor

Over: SMALL

080033006, Cedar, IA

Built 1976 Load: 15.6 t ADT: 15

290TH ST

Poor

Over: STREAM

097351505, Clay, IA

Built 1913 Load: 15.6 t ADT: 5

FM

Poor

Over: SOUTH WYACONDAH DITCH

068132010, Davis, IA

Built 1974 Load: 15.6 t ADT: 420

LOCAL

Poor

Over: CREEK

070143404, Davis, IA

Built 1959 Load: 15.6 t ADT: 100

LOCAL

Poor

Over: STREAM

078330505, Guthrie, IA

Built 1957 Load: 15.6 t ADT: 20

FM

Poor

Over: SOUTH RACCOON

080323301, Guthrie, IA

Built 1959 Load: 15.6 t ADT: 50

FM

Poor

Over: SMALL CREEK

086E30802, Jackson, IA

Built 1967 Load: 15.6 t ADT: 60

LOCAL

Poor

Over: PICAYUNE CREEK

069053006, Lee, IA

Built 1934 Load: 15.6 t ADT: 30

110TH STREET

Poor

Over: WEST TARKIO RIVER

070381101, Page, IA

Built 1953 Load: 15.6 t ADT: 20

GRANITE AVE

Poor

Over: PERRY CREEK

091472202, Plymouth, IA

Built 1952 Load: 15.6 t ADT: 5

FM

Poor

Over: WALNUT CREEK

069181402, Appanoose, IA

Built 1955 Load: 15.7 t ADT: 160

ATLAS RD

Poor

Over: SHELL ROCK RIVER

091141806, Bremer, IA

Built 1959 Load: 15.7 t ADT: 226

YUKON AV

Poor

Over: RIVER

092110102, Bremer, IA

Built 1956 Load: 15.7 t ADT: 39

200TH

Poor

Over: E BR BEAVER DAM CREEK

095201701, Cerro Gordo, IA

Built 1965 Load: 15.7 t ADT: 16

FM

Poor

Over: STREAM

070121704, Davis, IA

Built 1957 Load: 15.7 t ADT: 60

FM

Poor

Over: BEAVER CREEK ,BRANCH

089182001, Grundy, IA

Built 1954 Load: 15.7 t ADT: 79

FM

Poor

Over: CREEK

086402401, Ida, IA

Built 1900 Load: 15.7 t ADT: 26

LOCAL

Poor

Over: BRUSH CREEK

085E42906, Jackson, IA

Built 1960 Load: 15.7 t ADT: 30

S 104TH AVE E

Poor

Over: LITTLE ELK CREEK

078182303, Jasper, IA

Built 1932 Load: 15.7 t ADT: 25

FM

Poor

Over: STREAM

076112402, Keokuk, IA

Built 1950 Load: 15.7 t ADT: 30

LOC 200TH ST

Poor

Over: FOUR MILE CREEK

095291701, Kossuth, IA

Built 1974 Load: 15.7 t ADT: 26

LOCAL

Poor

Over: DRAINAGE

075142605, Mahaska, IA

Built 1951 Load: 15.7 t ADT: 45

LOCAL

Poor

Over: DRAINAGE

075162206, Mahaska, IA

Built 1973 Load: 15.7 t ADT: 80

LOCAL

Poor

Over: DRAINAGE

077140804, Mahaska, IA

Built 1957 Load: 15.7 t ADT: 20

FM

Poor

Over: WILLOW CREEK

082421202, Monona, IA

Built 1952 Load: 15.7 t ADT: 40

FM

Poor

Over: TARKIO CREEK

071373201, Montgomery, IA

Built 1955 Load: 15.7 t ADT: 219

Showing 18,401-18,450 of 20,753 bridges

Related

All states → | National rankings → | Understanding conditions → | Retired SD term explained →
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.

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). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.

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.

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.