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

40TH ST

Poor

Over: HUNTER CREEK

091102401, Fayette, IA

Built 1950 Load: 24.9 t ADT: 471

FM

Poor

Over: HONEY CREEK

086202405, Hardin, IA

Built 1967 Load: 24.9 t ADT: 373

LOCAL

Poor

Over: CONVEY CREEK

079092602, Iowa, IA

Built 1920 Load: 24.9 t ADT: 100

FM

Poor

Over: LITTLE SNIPE CREEK

081191401, Jasper, IA

Built 1927 Load: 24.9 t ADT: 40

LOCAL

Poor

Over: M BR BUCKLEY CREEK

077170301, Mahaska, IA

Built 1950 Load: 24.9 t ADT: 45

FM-TRUMAN AVE

Poor

Over: WALNUT CREEK

077381403, Pottawattamie, IA

Built 1963 Load: 24.9 t ADT: 34

LOCAL

Poor

Over: SOUTH ENGLISH RIVER

078142907, Poweshiek, IA

Built 1984 Load: 24.9 t ADT: 15

LOCAL

Poor

Over: SOUTH BRANCH SALT CREEK

084151303, Tama, IA

Built 1940 Load: 24.9 t ADT: 29

LOCAL ROAD

Poor

Over: TROUT CREEK

097091301, Winneshiek, IA

Built 1915 Load: 24.9 t ADT: 33

LOCAL

Poor

Over: PURGATORY CR.

088322601, Calhoun, IA

Built 1971 Load: 25.0 t ADT: 11

LOCAL

Poor

Over: FIELD STREAM

082333001, Carroll, IA

Built 1957 Load: 25.0 t ADT: 29

EUREKA AVE

Poor

Over: MIDDLE BR WAPSINONOC CR

079041402, Cedar, IA

Built 1895 Load: 25.0 t ADT: 20

LOCAL

Poor

Over: CREEK

085170402, Marshall, IA

Built 1945 Load: 25.0 t ADT: 20

FM K-42

Poor

Over: CARTER CREEK

090460202, Plymouth, IA

Built 1966 Load: 25.0 t ADT: 190

LOCAL

Poor

Over: SUGAR CREEK

079161702, Poweshiek, IA

Built 1980 Load: 25.0 t ADT: 45

LOCAL

Poor

Over: BRANCH SALT CREEK

084142801, Tama, IA

Built 1940 Load: 25.0 t ADT: 39

BRYAN RD

Poor

Over: TRIB TO CEDAR RIVER

87-11-18-01-10, Black Hawk, IA

Built 1951 Load: 25.1 t ADT: 49

FM

Poor

Over: SMALL STREAM

089102201, Buchanan, IA

Built 1957 Load: 25.1 t ADT: 79

FM

Poor

Over: WEST FORK CEDAR RIVER

090150504, Butler, IA

Built 1964 Load: 25.1 t ADT: 874

LOCAL

Poor

Over: CRAB APPLE CREEK

093170202, Butler, IA

Built 1987 Load: 25.1 t ADT: 21

LOCAL

Poor

Over: WAPSIPINICON RIVER

096143501, Chickasaw, IA

Built 1955 Load: 25.1 t ADT: 29

KILLDEER AVE

Poor

Over: DRAINAGE DITCH NO 6

090211102, Franklin, IA

Built 1956 Load: 25.1 t ADT: 16

FM TIMBER AVE

Poor

Over: MAYNES CREEK

091191602, Franklin, IA

Built 1955 Load: 25.1 t ADT: 49

220 STREET

Poor

Over: HORSE CREEK

068431103, Fremont, IA

Built 1957 Load: 25.1 t ADT: 214

300 210TH ST

Poor

Over: DD #10

095260901, Hancock, IA

Built 1958 Load: 25.1 t ADT: 11

FM 830 260 ST

Poor

Over: WEST IOWA RIVER

096251701, Hancock, IA

Built 1956 Load: 25.1 t ADT: 26

LOCAL

Poor

Over: DEER CREEK

078090902, Iowa, IA

Built 1976 Load: 25.1 t ADT: 71

L14

Poor

Over: DRY RUN CREEK

100442606, Lyon, IA

Built 1964 Load: 25.1 t ADT: 509

LOCAL

Poor

Over: CREEK

083171103, Marshall, IA

Built 1956 Load: 25.1 t ADT: 49

FM

Poor

Over: MINERVA CREEK

084200203, Marshall, IA

Built 1957 Load: 25.1 t ADT: 59

LOCAL

Poor

Over: INDIAN CREEK

083162902, Tama, IA

Built 1940 Load: 25.1 t ADT: 49

FM

Poor

Over: STREAM

090260901, Wright, IA

Built 1981 Load: 25.1 t ADT: 71

FM

Poor

Over: IOWA RIVER

092241405, Wright, IA

Built 1961 Load: 25.1 t ADT: 450

LOCAL ROAD

Poor

Over: BRANCH OF WOLF CREEK

086171803, Grundy, IA

Built 1977 Load: 25.2 t ADT: 44

LOCAL

Poor

Over: MINERVA CR

084201502, Marshall, IA

Built 1919 Load: 25.2 t ADT: 30

SUMAC RD

Poor

Over: STREAM

077423401, Pottawattamie, IA

Built 1949 Load: 25.2 t ADT: 45

FM

Poor

Over: STREAM

079163607, Poweshiek, IA

Built 1948 Load: 25.2 t ADT: 20

LOCAL

Poor

Over: STREAM

080161202, Poweshiek, IA

Built 1968 Load: 25.2 t ADT: 26

LOCAL

Poor

Over: SILVER CREEK

099053103, Allamakee, IA

Built 1958 Load: 25.3 t ADT: 59

FM

Poor

Over: NORTH SOAP CREEK

070161204, Appanoose, IA

Built 1968 Load: 25.3 t ADT: 850

LOCAL

Poor

Over: DAVIDS CREEK

079341704, Audubon, IA

Built 1970 Load: 25.3 t ADT: 30

LOC 130TH AVE

Poor

Over: STREAM

089061502, Delaware, IA

Built 1970 Load: 25.3 t ADT: 42

LOCAL

Poor

Over: BEAVER CREEK

095181902, Floyd, IA

Built 1937 Load: 25.3 t ADT: 20

LOCAL

Poor

Over: LONG DICK CR

086230401, Hamilton, IA

Built 1924 Load: 25.3 t ADT: 20

FM

Poor

Over: DD

089210201, Hardin, IA

Built 1971 Load: 25.3 t ADT: 776

LOCAL

Poor

Over: CREEK

085E50703, Jackson, IA

Built 1940 Load: 25.3 t ADT: 11

LOCAL

Poor

Over: UNNAMED STREAM

076120201, Keokuk, IA

Built 1971 Load: 25.3 t ADT: 11

FM

Poor

Over: MOSQUITO CREEK

078022806, Muscatine, IA

Built 1978 Load: 25.3 t ADT: 1,260

FM

Poor

Over: WOLF CREEK

0884408, Woodbury, IA

Built 1956 Load: 25.3 t ADT: 40

FM

Poor

Over: STREAM

068173504, Appanoose, IA

Built 1955 Load: 25.4 t ADT: 35

Showing 19,901-19,950 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.