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

LOCAL

Poor

Over: SMALL STREAM

069102103, Van Buren, IA

Built 1975 Load: 15.9 t ADT: 30

FM

Poor

Over: UPPER IOWA RIVER

099083104, Winneshiek, IA

Built 1937 Load: 15.9 t ADT: 324

LOCAL

Poor

Over: WHITE FOX CREEK

090251201, Wright, IA

Built 1968 Load: 15.9 t ADT: 26

LOCAL

Poor

Over: BR BLUE GRASS CREEK

079351008, Audubon, IA

Built 1925 Load: 16.0 t ADT: 21

PARRISH AVE

Poor

Over: PINE CR

088082804, Buchanan, IA

Built 1960 Load: 16.0 t ADT: 82

LOCAL

Poor

Over: DD 13

088323304, Calhoun, IA

Built 1974 Load: 16.0 t ADT: 20

FM

Poor

Over: PEDEE CREEK

079031304, Cedar, IA

Built 1965 Load: 16.0 t ADT: 110

295 AVENUE

Poor

Over: RELIEF

068421404, Fremont, IA

Built 1961 Load: 16.0 t ADT: 21

FM

Poor

Over: HONEY CREEK

086193004, Hardin, IA

Built 1900 Load: 16.0 t ADT: 29

LOCAL

Poor

Over: CREEK

089220801, Hardin, IA

Built 1978 Load: 16.0 t ADT: 15

VICTORY AVE

Poor

Over: UPPER IOWA

100112206, Howard, IA

Built 1949 Load: 16.0 t ADT: 393

S 24TH AVE W

Poor

Over: CHERRY CREEK

079190605, Jasper, IA

Built 1979 Load: 16.0 t ADT: 62

FM

Poor

Over: LICK CREEK

071112305, Jefferson, IA

Built 1951 Load: 16.0 t ADT: 120

FM

Poor

Over: STREAM

076121802, Keokuk, IA

Built 1956 Load: 16.0 t ADT: 35

FM

Poor

Over: NORTH RIVER

076281006, Madison, IA

Built 1960 Load: 16.0 t ADT: 100

FM

Poor

Over: IOWA RIVER

083170104, Marshall, IA

Built 1953 Load: 16.0 t ADT: 1,365

LOCAL

Poor

Over: DRAINAGE

072173305, Monroe, IA

Built 1968 Load: 16.0 t ADT: 110

PARK AVE W

Poor

Over: MAD CREEK

000000000, Muscatine, IA

Built 1924 Load: 16.0 t ADT: 184

LOCAL

Poor

Over: LIZARD CREEK

090310302, Pocahontas, IA

Built 1957 Load: 16.0 t ADT: 26

LOCAL

Poor

Over: GRAYBILL CREEK

074390601, Pottawattamie, IA

Built 1950 Load: 16.0 t ADT: 29

MAGNOLIA ROAD

Poor

Over: STREAM

076432003, Pottawattamie, IA

Built 1982 Load: 16.0 t ADT: 11

LOCAL RD

Poor

Over: SMALL

089370801, Sac, IA

Built 1977 Load: 16.0 t ADT: 30

LOCAL

Poor

Over: CREEK

067331603, Taylor, IA

Built 1949 Load: 16.0 t ADT: 5

LOCAL

Poor

Over: SMALL STREAM

071290606, Union, IA

Built 1990 Load: 16.0 t ADT: 11

100TH ST

Poor

Over: SUGAR CREEK

072132105, Wapello, IA

Built 1950 Load: 16.0 t ADT: 270

LOCAL RD

Poor

Over: SKILLET CREEK

086271606, Webster, IA

Built 1982 Load: 16.0 t ADT: 50

LOCAL

Poor

Over: MCELHANEY CREEK

089441301, Woodbury, IA

Built 1981 Load: 16.0 t ADT: 20

UNION AVENUE

Poor

Over: SAYLINGS CREEK

071321002, Adams, IA

Built 1965 Load: 16.1 t ADT: 26

LOCAL

Poor

Over: SMALL STREAM

070173107, Appanoose, IA

Built 1954 Load: 16.1 t ADT: 91

LOCAL

Poor

Over: LITTLE BEAVER CREEK

082273308, Boone, IA

Built 1939 Load: 16.1 t ADT: 26

LOCAL

Poor

Over: DRAINAGE DITCH

092353202, Buena Vista, IA

Built 1977 Load: 16.1 t ADT: 50

LOCAL-V AVE.

Poor

Over: MAPLE RIVER

092392202, Cherokee, IA

Built 1957 Load: 16.1 t ADT: 34

FM

Poor

Over: SPRING BRANCH

095133501, Chickasaw, IA

Built 1951 Load: 16.1 t ADT: 118

FARM DRIVE

Poor

Over: BRANCH ELK CREEK

097132904, Chickasaw, IA

Built 1974 Load: 16.1 t ADT: 10

FM

Poor

Over: BR WAPSIPINICON RIVER

097142903, Chickasaw, IA

Built 1960 Load: 16.1 t ADT: 29

LOCAL

Poor

Over: STREAM

069123608, Davis, IA

Built 1988 Load: 16.1 t ADT: 11

LOCAL

Poor

Over: CREEK

096182003, Floyd, IA

Built 1958 Load: 16.1 t ADT: 78

LOCAL

Poor

Over: MIDDLE RACOON RIVER

079302505, Guthrie, IA

Built 1959 Load: 16.1 t ADT: 71

FM

Poor

Over: SOUTH RACOON RIVER

079302908, Guthrie, IA

Built 1957 Load: 16.1 t ADT: 50

LOCAL

Poor

Over: CREEK

087203503, Hardin, IA

Built 1983 Load: 16.1 t ADT: 41

LOC 210TH ST

Poor

Over: LITTLE PIGEON

080413501, Harrison, IA

Built 1930 Load: 16.1 t ADT: 11

LOCAL

Poor

Over: DICKEY CREEK

071063602, Henry, IA

Built 1956 Load: 16.1 t ADT: 73

LOCAL

Poor

Over: SUGAR CREEK

073072802, Henry, IA

Built 1976 Load: 16.1 t ADT: 41

FM

Poor

Over: COMPETINE CREEK

072110510, Jefferson, IA

Built 1954 Load: 16.1 t ADT: 45

LOCAL ROAD

Poor

Over: STREAM

074103103, Keokuk, IA

Built 1968 Load: 16.1 t ADT: 20

LOC 200TH ST

Poor

Over: DRAINAGE DITCH 25

095271301, Kossuth, IA

Built 1969 Load: 16.1 t ADT: 11

LOCAL RD

Poor

Over: DRAINAGE

074293505, Madison, IA

Built 1978 Load: 16.1 t ADT: 40

LOCAL

Poor

Over: TURKEY RUN

074172402, Mahaska, IA

Built 1948 Load: 16.1 t ADT: 50

LOCAL

Poor

Over: MIDDLE TIMBER CREEK

083183402, Marshall, IA

Built 1938 Load: 16.1 t ADT: 16

FM

Poor

Over: IOWA RIVER

084172907, Marshall, IA

Built 1955 Load: 16.1 t ADT: 2,838

Showing 18,501-18,550 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.