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: CHARITON RIVER

069210504, Wayne, IA

Built 1958 Load: 9.3 t ADT: 90

COLDWATER CREEK RD

Poor

Over: CREEK

100093205, Winneshiek, IA

Built 1978 Load: 9.3 t ADT: 59

LOCAL/KEYSTONE

Poor

Over: TURKEY CREEK

076362701, Cass, IA

Built 1900 Load: 9.4 t ADT: 35

B60-IVORY RD

Poor

Over: NORTH CEDAR CREEK

094031704, Clayton, IA

Built 1913 Load: 9.4 t ADT: 5

LOC 128 TRAIL

Poor

Over: BOYER RIVER

081411705, Harrison, IA

Built 1940 Load: 9.4 t ADT: 89

LOCAL

Poor

Over: STREAM

072292504, Union, IA

Built 1988 Load: 9.4 t ADT: 46

LOCAL

Poor

Over: REEDS CREEK

068081103, Van Buren, IA

Built 1967 Load: 9.4 t ADT: 35

LOCAL

Poor

Over: WOLF CREEK

087441603, Woodbury, IA

Built 1938 Load: 9.4 t ADT: 11

LOCAL

Poor

Over: LUICKS CREEK

092230401, Wright, IA

Built 1979 Load: 9.4 t ADT: 51

FM

Poor

Over: SM STREAM

090382101, Buena Vista, IA

Built 1974 Load: 9.5 t ADT: 569

LOCAL

Poor

Over: WOLF CREEK

070260207, Decatur, IA

Built 1964 Load: 9.5 t ADT: 11

DOGWOOD AVE

Poor

Over: DRAINAGE

092482602, Plymouth, IA

Built 1970 Load: 9.5 t ADT: 15

LOCAL

Poor

Over: SMALL STREAM

073282101, Union, IA

Built 1900 Load: 9.5 t ADT: 30

FM

Poor

Over: SMALL STREAM

092181201, Butler, IA

Built 1953 Load: 9.6 t ADT: 35

LOCAL/KEYSTONE

Poor

Over: SPRING CREEK

076372701, Cass, IA

Built 1900 Load: 9.6 t ADT: 15

LOCAL

Poor

Over: LONG CREEK

070262803, Decatur, IA

Built 1915 Load: 9.6 t ADT: 15

2990 BIRCH AVE

Poor

Over: LINDSEY CREEK

097262902, Hancock, IA

Built 1963 Load: 9.6 t ADT: 35

LOCAL

Poor

Over: LITTLE ROCK RIVER

100423001, Osceola, IA

Built 1941 Load: 9.6 t ADT: 15

LOCAL

Poor

Over: N LIZARD CREEK

092322302, Pocahontas, IA

Built 1914 Load: 9.6 t ADT: 11

A AVE

Poor

Over: STREAM

092060604, Clayton, IA

Built 1900 Load: 9.7 t ADT: 11

LOCAL

Poor

Over: STREAM

066052403, Lee, IA

Built 1900 Load: 9.7 t ADT: 11

FM

Poor

Over: TARKIO CREEK

071370405, Montgomery, IA

Built 1949 Load: 9.7 t ADT: 159

FM

Poor

Over: BRANCH WOLF CREEK

085130602, Tama, IA

Built 1916 Load: 9.7 t ADT: 34

FM - HIGHLAND

Poor

Over: INDIAN CREEK

076370801, Cass, IA

Built 1959 Load: 9.8 t ADT: 278

YANKEE AVE

Poor

Over: PLUM CREEK

082012404, Cedar, IA

Built 1976 Load: 9.8 t ADT: 15

LOCAL

Poor

Over: BOYER RIVER

085370601, Crawford, IA

Built 1971 Load: 9.8 t ADT: 11

MIDDLE ROAD

Poor

Over: SPRING CREEK

APPROX. 7000' E. OF RD. H, Des Moines, IA

Built 1910 Load: 9.8 t ADT: 5

LOCAL

Poor

Over: SMALL STREAM

081330901, Guthrie, IA

Built 1987 Load: 9.8 t ADT: 15

FM

Poor

Over: SMALL STREAM

081333101, Guthrie, IA

Built 1984 Load: 9.8 t ADT: 26

FM 190TH AVE

Poor

Over: PLUM CREEK

096271802, Kossuth, IA

Built 1960 Load: 9.8 t ADT: 133

FM 380TH ST

Poor

Over: UNION SLOUGH DITCH

098281401, Kossuth, IA

Built 1964 Load: 9.8 t ADT: 180

LCL-INGRAHAM AV

Poor

Over: STREAM

072401501, Mills, IA

Built 1954 Load: 9.8 t ADT: 5

LOCAL

Poor

Over: SMALL STREAM

073362601, Montgomery, IA

Built 1985 Load: 9.8 t ADT: 5

LOCAL

Poor

Over: LITTLE BEAVER CREEK

080253504, Polk, IA

Built 1926 Load: 9.8 t ADT: 199

LOCAL

Poor

Over: STREAM

070300703, Ringgold, IA

Built 1940 Load: 9.8 t ADT: 29

FM

Poor

Over: CREEK

079343003, Audubon, IA

Built 1956 Load: 9.9 t ADT: 34

LOCAL - 740TH

Poor

Over: WEST NODAWAY RIVER

075343302, Cass, IA

Built 1978 Load: 9.9 t ADT: 51

LOCAL- 600TH ST

Poor

Over: ROCK CREEK

090410401, Cherokee, IA

Built 1900 Load: 9.9 t ADT: 20

LOCAL 460TH ST

Poor

Over: SIOUX RIVER

093422501, Cherokee, IA

Built 1931 Load: 9.9 t ADT: 11

LOCAL

Poor

Over: BOYER RIVER

084380504, Crawford, IA

Built 1971 Load: 9.9 t ADT: 30

LOCAL

Poor

Over: BR OF OLD MANS CREEK

079101005, Iowa, IA

Built 1976 Load: 9.9 t ADT: 150

LOCAL

Poor

Over: SMALL STREAM

080120203, Iowa, IA

Built 1969 Load: 9.9 t ADT: 5

LOCAL

Poor

Over: COAL CREEK

074170107, Mahaska, IA

Built 1900 Load: 9.9 t ADT: 71

LOCAL

Poor

Over: BRUSH CREEK

082172202, Marshall, IA

Built 1917 Load: 9.9 t ADT: 47

FM

Poor

Over: NORTH RIVER

077253308, Warren, IA

Built 1949 Load: 9.9 t ADT: 89

LOCAL (LWC)

Poor

Over: WEASEL CREEK

082110101, Benton, IA

Built 1979 Load: 10.0 t ADT: 45

GREEN RD

Poor

Over: ROCK RUN CR

080030803, Cedar, IA

Built 1920 Load: 10.0 t ADT: 50

300TH ST

Poor

Over: MINERS CREEK

092031205, Clayton, IA

Built 1916 Load: 10.0 t ADT: 39

LOCAL

Poor

Over: SMALL STREAM

084413201, Crawford, IA

Built 1965 Load: 10.0 t ADT: 21

LOCAL ROAD

Poor

Over: BRANCH BLACK HAWK CREEK

088151802, Grundy, IA

Built 1971 Load: 10.0 t ADT: 29

Showing 17,601-17,650 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.