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

POLK AVE

Poor

Over: DEEP CREEK

092440202, Plymouth, IA

Built 1958 Load: 24.5 t ADT: 60

235TH ST

Poor

Over: BROKEN KETTLE CK

091481107, Plymouth, IA

Built 1900 Load: 24.5 t ADT: 15

LOCAL

Poor

Over: STREAM

081150701, Poweshiek, IA

Built 1977 Load: 24.5 t ADT: 30

FM

Poor

Over: OVERFLOW ON BOYER RIVER

089372201, Sac, IA

Built 1964 Load: 24.5 t ADT: 249

NORTH MAIN ST

Poor

Over: SMALL STREAM

083162107, Tama, IA

Built 1962 Load: 24.5 t ADT: 869

FM

Poor

Over: PLAQUE MINE CREEK

082130504, Tama, IA

Built 1970 Load: 24.5 t ADT: 481

LOCAL

Poor

Over: BRANCH OF SALT CREEK

083133406, Tama, IA

Built 1987 Load: 24.5 t ADT: 26

LOCAL

Poor

Over: EAST BRANCH SALT CREEK

084131302, Tama, IA

Built 1940 Load: 24.5 t ADT: 35

LOCAL

Poor

Over: WOLF CREEK

085140906, Tama, IA

Built 1975 Load: 24.5 t ADT: 15

LOCAL

Poor

Over: FOUR MILE CREEK

086153002, Tama, IA

Built 1988 Load: 24.5 t ADT: 11

FM

Poor

Over: PLATTE BRANCH

068321201, Taylor, IA

Built 1950 Load: 24.5 t ADT: 45

FM

Poor

Over: CREEK

070111906, Van Buren, IA

Built 1955 Load: 24.5 t ADT: 50

FM

Poor

Over: WILLIAMS CREEK

074073404, Washington, IA

Built 1936 Load: 24.5 t ADT: 1,650

LOCAL

Poor

Over: GOOSE CREEK

076062401, Washington, IA

Built 1975 Load: 24.5 t ADT: 26

FM

Poor

Over: TROUT RIVER

098072109, Winneshiek, IA

Built 1956 Load: 24.5 t ADT: 953

FM

Poor

Over: CREEK

0884232, Woodbury, IA

Built 1962 Load: 24.5 t ADT: 219

FOX RD

Poor

Over: SPRING CREEK

88-11-24-01, Black Hawk, IA

Built 1949 Load: 24.6 t ADT: 49

LOCAL

Poor

Over: BRANCH HORTON CREEK

094133102, Chickasaw, IA

Built 1952 Load: 24.6 t ADT: 25

110TH AVE

Poor

Over: WILLOW CREEK

095380502, Clay, IA

Built 1928 Load: 24.6 t ADT: 30

LOC 320 AVE

Poor

Over: SMALL STREAM

087031402, Delaware, IA

Built 1971 Load: 24.6 t ADT: 20

LOCAL ROAD

Poor

Over: BRANCH OF WOLF CREEK

086171803, Grundy, IA

Built 1977 Load: 24.6 t ADT: 44

LOCAL

Poor

Over: CREEK

086200102, Hardin, IA

Built 1977 Load: 24.6 t ADT: 16

LOCAL

Poor

Over: SMALL CREEK

086E13401, Jackson, IA

Built 1940 Load: 24.6 t ADT: 34

FM

Poor

Over: CREEK

073102704, Jefferson, IA

Built 1952 Load: 24.6 t ADT: 50

LOCAL

Poor

Over: SMALL STREAM

068291603, Ringgold, IA

Built 1951 Load: 24.6 t ADT: 11

LOCAL

Poor

Over: STREAM

070303310, Ringgold, IA

Built 1975 Load: 24.6 t ADT: 34

10TH AVE

Poor

Over: CREEK

080E10502, Scott, IA

Built 1951 Load: 24.6 t ADT: 90

LOCAL

Poor

Over: PAINT CREEK

E72000500, Allamakee, IA

Built 1900 Load: 24.7 t ADT: 120

LOCAL

Poor

Over: STREAM

067170702, Appanoose, IA

Built 1969 Load: 24.7 t ADT: 11

105TH AVE

Poor

Over: HENRY CREEK

094381804, Clay, IA

Built 1965 Load: 24.7 t ADT: 41

JUNIPER RD.

Poor

Over: DRY BRANCH CREEK

095081002, Fayette, IA

Built 1964 Load: 24.7 t ADT: 403

W SOUTH ST

Poor

Over: MIDDLE RACCOON RIVER

079300504, Guthrie, IA

Built 1965 Load: 24.7 t ADT: 358

LOC 2030 210TH

Poor

Over: GOLLS CREEK

095230801, Hancock, IA

Built 1955 Load: 24.7 t ADT: 62

LOCAL

Poor

Over: SILVER CREEK

088391602, Ida, IA

Built 1983 Load: 24.7 t ADT: 5

FM

Poor

Over: CROOKED CREEK

076102402, Keokuk, IA

Built 1964 Load: 24.7 t ADT: 500

FM

Poor

Over: NELSON CREEK

098483204, Lyon, IA

Built 1966 Load: 24.7 t ADT: 789

FM

Poor

Over: KLONDIKE CREEK

099482105, Lyon, IA

Built 1962 Load: 24.7 t ADT: 1,017

L14

Poor

Over: TURNER CREEK

100441418, Lyon, IA

Built 1964 Load: 24.7 t ADT: 509

216TH STREET

Poor

Over: SNAKE CREEK

069373103, Page, IA

Built 1961 Load: 24.7 t ADT: 71

FM

Poor

Over: STREAM

095322402, Palo Alto, IA

Built 1972 Load: 24.7 t ADT: 60

FM

Poor

Over: PLUM CREEK

070302902, Ringgold, IA

Built 1954 Load: 24.7 t ADT: 120

LOCAL

Poor

Over: BEAVER CREEK

099233501, Winnebago, IA

Built 1976 Load: 24.7 t ADT: 41

LOCAL/KEYSTONE

Poor

Over: CREEK

076342801, Cass, IA

Built 1981 Load: 24.8 t ADT: 26

FM

Poor

Over: LITTLE FLINT RIVER

070031608, Des Moines, IA

Built 1968 Load: 24.8 t ADT: 2,000

LOCAL

Poor

Over: STREAM

076131701, Keokuk, IA

Built 1967 Load: 24.8 t ADT: 50

FM

Poor

Over: CREEK

072170703, Monroe, IA

Built 1963 Load: 24.8 t ADT: 310

LOCAL

Poor

Over: STONY CREEK

080140301, Poweshiek, IA

Built 1971 Load: 24.8 t ADT: 15

E CEDAR-WAPSI RD

Poor

Over: CRANE CREEK

90-12-15-01, Black Hawk, IA

Built 1966 Load: 24.9 t ADT: 2,600

300 ST

Poor

Over: SMALL

090151601, Butler, IA

Built 1979 Load: 24.9 t ADT: 73

LOCAL

Poor

Over: BRUSHY FORK CREEK

082340602, Carroll, IA

Built 1925 Load: 24.9 t ADT: 60

Showing 19,851-19,900 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.