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

180TH ST

Poor

Over: DD 88

089321601, Calhoun, IA

Built 1900 Load: 14.0 t ADT: 26

FM - 710TH

Poor

Over: WATERWAY

076350106, Cass, IA

Built 1955 Load: 14.0 t ADT: 50

FM- Y AVE

Poor

Over: LITTLE MAPLE RIVER

090392502, Cherokee, IA

Built 1971 Load: 14.0 t ADT: 439

LOCAL

Poor

Over: SOAP CREEK

070140204, Davis, IA

Built 1920 Load: 14.0 t ADT: 110

LOCAL

Poor

Over: SMALL STREAM

081202707, Jasper, IA

Built 1970 Load: 14.0 t ADT: 51

FM

Poor

Over: DRAINAGE

075282203, Madison, IA

Built 1930 Load: 14.0 t ADT: 180

LOCAL

Poor

Over: DRAINAGE

076161903, Mahaska, IA

Built 1956 Load: 14.0 t ADT: 15

PRIVATE (SDB)

Poor

Over: STREAM (SDB)

079222604, Polk, IA

Built 1950 Load: 14.0 t ADT: 10

LOCAL

Poor

Over: BEAR CREEK

080132302, Poweshiek, IA

Built 1946 Load: 14.0 t ADT: 140

LOCAL

Poor

Over: STREAM

067282203, Ringgold, IA

Built 1949 Load: 14.0 t ADT: 5

LOCAL

Poor

Over: STREAM

089372801, Sac, IA

Built 1961 Load: 14.0 t ADT: 45

LOCAL

Poor

Over: STREAM

070221302, Wayne, IA

Built 1975 Load: 14.0 t ADT: 11

LOCAL

Poor

Over: STREAM

068171102, Appanoose, IA

Built 1954 Load: 14.1 t ADT: 35

LOCAL

Poor

Over: CREEK

090373002, Buena Vista, IA

Built 1972 Load: 14.1 t ADT: 15

LOCAL

Poor

Over: BR LITTLE SIOUX RIVER

093382302, Buena Vista, IA

Built 1921 Load: 14.1 t ADT: 11

FM

Poor

Over: E.CEDAR CR.

087313202, Calhoun, IA

Built 1938 Load: 14.1 t ADT: 20

LOCAL

Poor

Over: DD NO 83

088311801, Calhoun, IA

Built 1900 Load: 14.1 t ADT: 30

295 AVENUE

Poor

Over: SLIPPERY ELM HOLLOW

068421404, Fremont, IA

Built 1966 Load: 14.1 t ADT: 21

LOCAL

Poor

Over: STREAM

079320902, Guthrie, IA

Built 1959 Load: 14.1 t ADT: 20

LOCAL

Poor

Over: STREAM

080310901, Guthrie, IA

Built 1977 Load: 14.1 t ADT: 50

LOCAL

Poor

Over: TIPTON CREEK

087220401, Hardin, IA

Built 1985 Load: 14.1 t ADT: 20

LOC 335TH ST

Poor

Over: ALLEN CREEK

078443203, Harrison, IA

Built 1959 Load: 14.1 t ADT: 20

AUSTIN AVE

Poor

Over: STREAM

080451306, Harrison, IA

Built 1936 Load: 14.1 t ADT: 488

E 84TH ST S

Poor

Over: PRAIRIE CREEK

079181502, Jasper, IA

Built 1948 Load: 14.1 t ADT: 73

LOC 140TH AVE

Poor

Over: PURCELL CREEK

095281704, Kossuth, IA

Built 1980 Load: 14.1 t ADT: 81

LOCAL SECONDARY

Poor

Over: WEST BRANCH SUGAR CREEK

069062903, Lee, IA

Built 1934 Load: 14.1 t ADT: 30

FM

Poor

Over: JIM CREEK

077281802, Madison, IA

Built 1948 Load: 14.1 t ADT: 668

LOCAL

Poor

Over: DRAINAGE

077171604, Mahaska, IA

Built 1950 Load: 14.1 t ADT: 34

LOCAL

Poor

Over: LUTES CREEK

082170702, Marshall, IA

Built 1938 Load: 14.1 t ADT: 82

LOCAL

Poor

Over: MINERVA CR

084201801, Marshall, IA

Built 1945 Load: 14.1 t ADT: 5

LOCAL

Poor

Over: LITTLE ASHER CREEK

085183301, Marshall, IA

Built 1944 Load: 14.1 t ADT: 21

LCL-RIST AVE

Poor

Over: DRAINAGE

071433403, Mills, IA

Built 1961 Load: 14.1 t ADT: 15

LOCAL ROAD

Poor

Over: LOCAL STREAM

071383202, Montgomery, IA

Built 1985 Load: 14.1 t ADT: 20

200TH ST

Poor

Over: MINK CREEK

092462701, Plymouth, IA

Built 1953 Load: 14.1 t ADT: 34

LOCAL

Poor

Over: BEAVER CK

093311802, Pocahontas, IA

Built 1973 Load: 14.1 t ADT: 5

LOCAL ROAD

Poor

Over: CAMP CREEK

078221403, Polk, IA

Built 1914 Load: 14.1 t ADT: 26

142ND ST

Poor

Over: BEAR CREEK

085232803, Story, IA

Built 1900 Load: 14.1 t ADT: 30

IRR LOCAL

Poor

Over: BRANCH OF RICHLAND CREEK

082152001, Tama, IA

Built 1941 Load: 14.1 t ADT: 29

LOCAL

Poor

Over: WOLF CREEK

083132101, Tama, IA

Built 1940 Load: 14.1 t ADT: 20

FM

Poor

Over: WEST 102 RIVER

070341201, Taylor, IA

Built 1952 Load: 14.1 t ADT: 34

LOCAL

Poor

Over: STREAM

073280202, Union, IA

Built 1900 Load: 14.1 t ADT: 51

LOCAL ROAD

Poor

Over: CREEK

098073205, Winneshiek, IA

Built 1915 Load: 14.1 t ADT: 29

130TH ST

Poor

Over: DRAINAGE DITCH 107

093252001, Wright, IA

Built 1936 Load: 14.1 t ADT: 26

LOCAL

Poor

Over: STREAM

074333101, Adair, IA

Built 1954 Load: 14.2 t ADT: 15

N77 UNION AVE

Poor

Over: CIPRA BRANCH

072321002, Adams, IA

Built 1900 Load: 14.2 t ADT: 71

FM-GINKO AVENUE

Poor

Over: KEMP CREEK

072343104, Adams, IA

Built 1976 Load: 14.2 t ADT: 60

FM

Poor

Over: CREEK

080351001, Audubon, IA

Built 1946 Load: 14.2 t ADT: 34

LOCAL

Poor

Over: WEST CREEK

073262207, Clarke, IA

Built 1976 Load: 14.2 t ADT: 11

LOCAL

Poor

Over: PICAYNE CREEK

083381101, Crawford, IA

Built 1960 Load: 14.2 t ADT: 15

FM

Poor

Over: SEVEN MILE CREEK

067271302, Decatur, IA

Built 1969 Load: 14.2 t ADT: 190

Showing 18,151-18,200 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.