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: BOYLAN CREEK

092181001, Butler, IA

Built 1967 Load: 18.5 t ADT: 29

LOCAL

Poor

Over: D.D.

087333102, Calhoun, IA

Built 1957 Load: 18.5 t ADT: 15

LOCAL

Poor

Over: DD 20

088322402, Calhoun, IA

Built 1948 Load: 18.5 t ADT: 26

FM - 690TH

Poor

Over: TROUBLESOME CREEK

077351502, Cass, IA

Built 1960 Load: 18.5 t ADT: 210

HAYES AVE

Poor

Over: BR ROCK RUN CR

081031704, Cedar, IA

Built 1900 Load: 18.5 t ADT: 26

QUINCY AVE

Poor

Over: BR MILL CR

082021104, Cedar, IA

Built 1925 Load: 18.5 t ADT: 50

FM

Poor

Over: SOUTH WEST CREEK

072261004, Clarke, IA

Built 1978 Load: 18.5 t ADT: 89

JASPER RD.

Poor

Over: FROG HOLLOW CR

094083404, Fayette, IA

Built 1958 Load: 18.5 t ADT: 44

FM

Poor

Over: MIDDLE RIVER

078320802, Guthrie, IA

Built 1959 Load: 18.5 t ADT: 50

LOCAL RD

Poor

Over: SMALL

078330202, Guthrie, IA

Built 1978 Load: 18.5 t ADT: 20

260TH TRAIL

Poor

Over: MASON CREEK

079322205, Guthrie, IA

Built 1987 Load: 18.5 t ADT: 45

125TH ST

Poor

Over: SMALL STREAM

081431603, Harrison, IA

Built 1960 Load: 18.5 t ADT: 5

FM

Poor

Over: N FORK MAQUOKETA RIVER

085E22107, Jackson, IA

Built 1952 Load: 18.5 t ADT: 400

FM

Poor

Over: CLEAR CREEK

081200801, Jasper, IA

Built 1914 Load: 18.5 t ADT: 40

FM

Poor

Over: DRAINAGE

072080203, Jefferson, IA

Built 1954 Load: 18.5 t ADT: 60

FM

Poor

Over: WEST BRANCH

074293402, Madison, IA

Built 1957 Load: 18.5 t ADT: 131

FM

Poor

Over: BADGER CREEK

077261504, Madison, IA

Built 1956 Load: 18.5 t ADT: 1,404

FM

Poor

Over: TOM CREEK

077283004, Madison, IA

Built 1954 Load: 18.5 t ADT: 477

LOCAL

Poor

Over: CREEK

085182704, Marshall, IA

Built 1918 Load: 18.5 t ADT: 47

FIELD ENTRANCE

Poor

Over: DRAINAGE (SDB)

070391402, Page, IA

Built 1900 Load: 18.5 t ADT: 10

LOCAL

Poor

Over: DD 175

096333401, Palo Alto, IA

Built 1926 Load: 18.5 t ADT: 21

250TH STREET

Poor

Over: STREAM

074421704, Pottawattamie, IA

Built 1940 Load: 18.5 t ADT: 11

LOCAL

Poor

Over: RICHLAND CREEK

082152104, Tama, IA

Built 1925 Load: 18.5 t ADT: 26

LOCAL

Poor

Over: STREAM

071303603, Union, IA

Built 2000 Load: 18.5 t ADT: 15

MAIN ST

Poor

Over: TRIB DES MOINES RIVER

070110803, Van Buren, IA

Built 1965 Load: 18.5 t ADT: 5

LOCAL ROAD

Poor

Over: CREEK

099081105, Winneshiek, IA

Built 1900 Load: 18.5 t ADT: 11

LOCAL RD

Poor

Over: BR MUD CK

082100203, Benton, IA

Built 1900 Load: 18.6 t ADT: 20

LOCAL

Poor

Over: EAST BOYER RIVER

083380806, Crawford, IA

Built 1967 Load: 18.6 t ADT: 125

LOCAL

Poor

Over: S CHEQUEST LAKE CREEK

069121504, Davis, IA

Built 1953 Load: 18.6 t ADT: 45

240 TH

Poor

Over: BUTTRICKS CREEK

083301403, Greene, IA

Built 1957 Load: 18.6 t ADT: 26

LOCAL

Poor

Over: BLACK HAWK CREEK

087152102, Grundy, IA

Built 1946 Load: 18.6 t ADT: 59

S 52ND AVE E

Poor

Over: SLATER CREEK

079182401, Jasper, IA

Built 1999 Load: 18.6 t ADT: 62

IRIS AVE

Poor

Over: MINK CREEK

093462102, Plymouth, IA

Built 1900 Load: 18.6 t ADT: 34

FM

Poor

Over: BRUSHY CREEK

088272302, Webster, IA

Built 1900 Load: 18.6 t ADT: 30

270TH ST

Poor

Over: DRAINAGE DITCH

097350201, Dickinson, IA

Built 1926 Load: 18.7 t ADT: 5

LOC 120TH ST

Poor

Over: TRULNER CREEK

094302903, Kossuth, IA

Built 1979 Load: 18.7 t ADT: 21

FM 150TH AVE

Poor

Over: LINDNER CREEK

096280902, Kossuth, IA

Built 1969 Load: 18.7 t ADT: 376

FM

Poor

Over: PITMAN CREEK

068050309, Lee, IA

Built 1975 Load: 18.7 t ADT: 120

FM

Poor

Over: SMALL STREAM

074052801, Louisa, IA

Built 1960 Load: 18.7 t ADT: 660

LOCAL

Poor

Over: DRAINAGE

071373202, Montgomery, IA

Built 1952 Load: 18.7 t ADT: 15

LOCAL

Poor

Over: OTTER CREEK

099413102, Osceola, IA

Built 1949 Load: 18.7 t ADT: 30

LOCAL

Poor

Over: SUGAR CREEK

079163103, Poweshiek, IA

Built 1958 Load: 18.7 t ADT: 34

LOCAL

Poor

Over: DAUGHERTY CREEK

068343303, Taylor, IA

Built 1977 Load: 18.7 t ADT: 15

LOCAL

Poor

Over: CREEK

068092903, Van Buren, IA

Built 1967 Load: 18.7 t ADT: 11

LOCAL

Poor

Over: TRIB CHEQUEST CREEK

069111303, Van Buren, IA

Built 1955 Load: 18.7 t ADT: 5

G-58

Poor

Over: OTTER CREEK

075232209, Warren, IA

Built 1951 Load: 18.7 t ADT: 996

LOCAL

Poor

Over: COOPER CREEK

068180902, Appanoose, IA

Built 1956 Load: 18.8 t ADT: 104

LOCAL

Poor

Over: D.D.

087340803, Calhoun, IA

Built 1900 Load: 18.8 t ADT: 20

FM

Poor

Over: BEAVER CREEK

096143001, Chickasaw, IA

Built 1961 Load: 18.8 t ADT: 44

LOCAL

Poor

Over: BROWN CR

100330803, Emmet, IA

Built 1961 Load: 18.8 t ADT: 60

Showing 19,051-19,100 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.