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: SIMPSON CREEK

095111704, Chickasaw, IA

Built 1965 Load: 19.1 t ADT: 62

LOCAL

Poor

Over: CATFISH CREEK

088E20903, Dubuque, IA

Built 1980 Load: 19.1 t ADT: 530

1970 CRANE AVE

Poor

Over: DD #10

095261602, Hancock, IA

Built 1969 Load: 19.1 t ADT: 15

FM

Poor

Over: MAQUOKETA RIVER

084E40803, Jackson, IA

Built 1950 Load: 19.1 t ADT: 330

LOCAL

Poor

Over: NORTH SKUNK RIVER

080182601, Jasper, IA

Built 1918 Load: 19.1 t ADT: 25

FM

Poor

Over: SNIPE CREEK

081191503, Jasper, IA

Built 1927 Load: 19.1 t ADT: 90

EBYS MILL RD

Poor

Over: SMALL CREEK

085020203, Jones, IA

Built 1964 Load: 19.1 t ADT: 44

LOCAL SECONDARY

Poor

Over: SUGAR CREEK

069073201, Lee, IA

Built 1976 Load: 19.1 t ADT: 15

FM

Poor

Over: RIGGS CREEK

100471204, Lyon, IA

Built 1970 Load: 19.1 t ADT: 290

LOCAL

Poor

Over: BRANCH N SKUNK RIVER

082203602, Marshall, IA

Built 1940 Load: 19.1 t ADT: 26

FM

Poor

Over: TIMBER CREEK

083182102, Marshall, IA

Built 1947 Load: 19.1 t ADT: 79

LOCAL

Poor

Over: CREEK

085183106, Marshall, IA

Built 1939 Load: 19.1 t ADT: 62

LOCAL

Poor

Over: WALNUT CREEK

081152302, Poweshiek, IA

Built 1926 Load: 19.1 t ADT: 5

640TH AVE

Poor

Over: CALAMUS CREEK

082222804, Story, IA

Built 1938 Load: 19.1 t ADT: 45

LOCAL

Poor

Over: EAST BRANCH SALT CREEK

085133401, Tama, IA

Built 1969 Load: 19.1 t ADT: 39

BIRCH RD.

Poor

Over: DIBBLE CREEK

095071105, Fayette, IA

Built 1917 Load: 19.2 t ADT: 20

FM

Poor

Over: SOUTH RACCOON

080331210, Guthrie, IA

Built 1957 Load: 19.2 t ADT: 26

LOCAL

Poor

Over: STREAM

081300701, Guthrie, IA

Built 1928 Load: 19.2 t ADT: 15

LOCAL

Poor

Over: SMALL STREAM

080201101, Jasper, IA

Built 1929 Load: 19.2 t ADT: 41

LOCAL

Poor

Over: STREAM

076140602, Mahaska, IA

Built 1953 Load: 19.2 t ADT: 45

LOCAL

Poor

Over: MUD CREEK

077220201, Polk, IA

Built 1920 Load: 19.2 t ADT: 50

LOCAL

Poor

Over: TWELVE MILE CREEK

086151002, Tama, IA

Built 1925 Load: 19.2 t ADT: 39

LOCAL

Poor

Over: DEER CREEK

090290914, Webster, IA

Built 1900 Load: 19.2 t ADT: 35

185TH ST.

Poor

Over: STREAM

092161703, Butler, IA

Built 1900 Load: 19.3 t ADT: 35

LOCAL

Poor

Over: CAMP CR.

087340503, Calhoun, IA

Built 1900 Load: 19.3 t ADT: 20

CEMETARY RD

Poor

Over: CEDAR RIVER

079031206, Cedar, IA

Built 1930 Load: 19.3 t ADT: 72

230TH ST

Poor

Over: STREAM

080011201, Cedar, IA

Built 1950 Load: 19.3 t ADT: 71

LOCAL

Poor

Over: DD

089223101, Hardin, IA

Built 1900 Load: 19.3 t ADT: 41

LOC CRESCENT AV

Poor

Over: BR LITTLE WAPSIPINICON R

098140904, Howard, IA

Built 1970 Load: 19.3 t ADT: 42

LOCAL

Poor

Over: BRANCH OLD MANS CREEK

079093002, Iowa, IA

Built 1930 Load: 19.3 t ADT: 50

WINSLOW RD

Poor

Over: INDIAN CREEK

084063000, Linn, IA

Built 2002 Load: 19.3 t ADT: 1,129

FM

Poor

Over: BURNETT CREEK

084170301, Marshall, IA

Built 1921 Load: 19.3 t ADT: 69

LOCAL

Poor

Over: ROCK CR

084171402, Marshall, IA

Built 1950 Load: 19.3 t ADT: 30

LOCAL

Poor

Over: BR MINERVA CR

084191502, Marshall, IA

Built 1947 Load: 19.3 t ADT: 16

FM-310TH STREET

Poor

Over: IAIS RR

076412002, Pottawattamie, IA

Built 1952 Load: 19.3 t ADT: 110

SUMAC ROAD

Poor

Over: STREAM

077383101, Pottawattamie, IA

Built 1992 Load: 19.3 t ADT: 11

115TH ST

Poor

Over: BEAR CREEK

085231103, Story, IA

Built 1955 Load: 19.3 t ADT: 120

LOCAL

Poor

Over: WOLF CREEK

073282006, Union, IA

Built 1983 Load: 19.3 t ADT: 21

LOCAL ROAD

Poor

Over: PAINTER CREEK

075252205, Warren, IA

Built 1947 Load: 19.3 t ADT: 35

FM

Poor

Over: SMALL STREAM

076082104, Washington, IA

Built 1917 Load: 19.3 t ADT: 50

LOCAL

Poor

Over: BEAVER CREEK

098230101, Winnebago, IA

Built 1985 Load: 19.3 t ADT: 35

LOCAL

Poor

Over: WRIGHT CREEK

088422302, Woodbury, IA

Built 1950 Load: 19.3 t ADT: 11

LOCAL

Poor

Over: SOAP CR

070141604, Davis, IA

Built 1958 Load: 19.4 t ADT: 34

LOCAL

Poor

Over: SMALL

081332004, Guthrie, IA

Built 1980 Load: 19.4 t ADT: 26

LOCAL

Poor

Over: SMALL STREAM

081180302, Jasper, IA

Built 1976 Load: 19.4 t ADT: 5

CENTER PT.RD.

Poor

Over: EAST OTTER CK

084070614, Linn, IA

Built 1956 Load: 19.4 t ADT: 5,401

LOCAL SEC RD

Poor

Over: GINGER CR

094400601, O'Brien, IA

Built 1900 Load: 19.4 t ADT: 15

LOCAL

Poor

Over: STREAM

095310102, Palo Alto, IA

Built 1925 Load: 19.4 t ADT: 46

130TH ST

Poor

Over: DRAINAGE

093451901, Plymouth, IA

Built 1961 Load: 19.4 t ADT: 20

FM

Poor

Over: TRIB DES MOINES R

068081605, Van Buren, IA

Built 1969 Load: 19.4 t ADT: 50

Showing 19,151-19,200 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.