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

FM

Poor

Over: STREAM

096122801, Chickasaw, IA

Built 1981 Load: 17.1 t ADT: 49

LOCAL

Poor

Over: BRANCH BEE CREEK

071262204, Clarke, IA

Built 1955 Load: 17.1 t ADT: 15

LOCAL

Poor

Over: SOUTH RIVER

073271605, Clarke, IA

Built 1979 Load: 17.1 t ADT: 26

LOCAL

Poor

Over: CREEK

069130404, Davis, IA

Built 1940 Load: 17.1 t ADT: 34

FM

Poor

Over: GRAND RIVER

067261305, Decatur, IA

Built 1959 Load: 17.1 t ADT: 329

FM

Poor

Over: POT HOLE CREEK

068271302, Decatur, IA

Built 1957 Load: 17.1 t ADT: 60

LOCAL

Poor

Over: WELDON RIVER

069243303, Decatur, IA

Built 1991 Load: 17.1 t ADT: 5

FM

Poor

Over: WELDON RIVER

070242101, Decatur, IA

Built 1951 Load: 17.1 t ADT: 79

LOCAL

Poor

Over: TRIB. TO TROUBLESOME

079331801, Guthrie, IA

Built 1970 Load: 17.1 t ADT: 11

1760 180TH ST

Poor

Over: EAST IOWA RIVER

095242601, Hancock, IA

Built 1959 Load: 17.1 t ADT: 15

FM

Poor

Over: SUGAR CREEK

073072803, Henry, IA

Built 1959 Load: 17.1 t ADT: 100

FM

Poor

Over: ODEBOLT CREEK

087392204, Ida, IA

Built 1949 Load: 17.1 t ADT: 60

FM

Poor

Over: CREEK

072112202, Jefferson, IA

Built 1949 Load: 17.1 t ADT: 35

LOCAL

Poor

Over: CEDAR CREEK

076133604, Keokuk, IA

Built 1979 Load: 17.1 t ADT: 5

LOC 230TH AVE

Poor

Over: PRAIRIE CREEK

095272602, Kossuth, IA

Built 1986 Load: 17.1 t ADT: 5

FM

Poor

Over: SUGAR CREEK

068071301, Lee, IA

Built 1949 Load: 17.1 t ADT: 30

FM

Poor

Over: STREAM

074182807, Marion, IA

Built 1981 Load: 17.1 t ADT: 120

LOCAL

Poor

Over: BURNETT CR

084170701, Marshall, IA

Built 1957 Load: 17.1 t ADT: 20

320TH

Poor

Over: LITTLE CEDAR RIVER

097161303, Mitchell, IA

Built 1931 Load: 17.1 t ADT: 226

FM

Poor

Over: JORDAN CREEK

082430511, Monona, IA

Built 1958 Load: 17.1 t ADT: 159

FM

Poor

Over: BEAVER CREEK

083430403, Monona, IA

Built 1958 Load: 17.1 t ADT: 11

LOCAL

Poor

Over: MONONA HARRISON DD

084451301, Monona, IA

Built 1959 Load: 17.1 t ADT: 45

FM

Poor

Over: SIOUX RIVER

084452511, Monona, IA

Built 1960 Load: 17.1 t ADT: 45

LOCAL

Poor

Over: WEST FORK DD

085450903, Monona, IA

Built 1961 Load: 17.1 t ADT: 45

FM

Poor

Over: HAITZ DD

085452501, Monona, IA

Built 1961 Load: 17.1 t ADT: 229

LOCAL

Poor

Over: CREEK

078E12102, Muscatine, IA

Built 1960 Load: 17.1 t ADT: 50

FM

Poor

Over: OCHEYEDAN RIVER

099403501, Osceola, IA

Built 1951 Load: 17.1 t ADT: 131

M-32 / C AVE

Poor

Over: STREAM

067390902, Page, IA

Built 1952 Load: 17.1 t ADT: 71

F AVENUE

Poor

Over: WEST TARKIO CREEK

069383002, Page, IA

Built 1977 Load: 17.1 t ADT: 20

J AVENUE

Poor

Over: WEST TARKIO RIVER

070382205, Page, IA

Built 1960 Load: 17.1 t ADT: 60

LOCAL

Poor

Over: STREAM

096310701, Palo Alto, IA

Built 1965 Load: 17.1 t ADT: 26

SHAMROCK AVE

Poor

Over: DEEP CREEK

093431502, Plymouth, IA

Built 1953 Load: 17.1 t ADT: 50

LOCAL

Poor

Over: STREAM

080130501, Poweshiek, IA

Built 1954 Load: 17.1 t ADT: 30

LOCAL

Poor

Over: BIG BEAR CREEK

080141412, Poweshiek, IA

Built 1951 Load: 17.1 t ADT: 161

OLD IA HWY 25

Poor

Over: SMALL STREAM

068313004, Ringgold, IA

Built 1934 Load: 17.1 t ADT: 289

FM

Poor

Over: TRAIL

070303203, Ringgold, IA

Built 1940 Load: 17.1 t ADT: 190

FM

Poor

Over: SMALL STREAM

086363101, Sac, IA

Built 1974 Load: 17.1 t ADT: 20

FM

Poor

Over: RICHLAND CREEK

082142202, Tama, IA

Built 1946 Load: 17.1 t ADT: 25

FM

Poor

Over: BRANCH IOWA RIVER

084162306, Tama, IA

Built 1965 Load: 17.1 t ADT: 678

LOCAL

Poor

Over: DAUGHERTY CREEK

067340903, Taylor, IA

Built 1952 Load: 17.1 t ADT: 29

FM

Poor

Over: WOLF CREEK

087443003, Woodbury, IA

Built 1958 Load: 17.1 t ADT: 330

DOGWOOD

Poor

Over: STREAM

098220302, Worth, IA

Built 1959 Load: 17.1 t ADT: 236

UNION AVENUE

Poor

Over: STREAM

071322702, Adams, IA

Built 1972 Load: 17.2 t ADT: 15

275TH STREET

Poor

Over: LONG BRANCH

071353404, Adams, IA

Built 1958 Load: 17.2 t ADT: 11

120TH STREET

Poor

Over: STREAM

073321701, Adams, IA

Built 1973 Load: 17.2 t ADT: 11

140TH STREET

Poor

Over: EAST NODAWAY RIVER

073322801, Adams, IA

Built 1900 Load: 17.2 t ADT: 11

GROVE AVENUE

Poor

Over: WILLIAMS CREEK

073340502, Adams, IA

Built 1970 Load: 17.2 t ADT: 5

ELM AVENUE

Poor

Over: WILLIAMS CREEK

073351202, Adams, IA

Built 1968 Load: 17.2 t ADT: 5

FM

Poor

Over: WEST CREEK

073263202, Clarke, IA

Built 1966 Load: 17.2 t ADT: 34

LOCAL

Poor

Over: SEVEN MILE CREEK

067272611, Decatur, IA

Built 1980 Load: 17.2 t ADT: 82

Showing 18,751-18,800 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.