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: INDIAN CREEK

081212706, Jasper, IA

Built 1918 Load: 10.0 t ADT: 35

IRVINGTON RD

Poor

Over: D D # 51

095291303, Kossuth, IA

Built 1966 Load: 10.0 t ADT: 330

FM

Poor

Over: BR TO WHITEBREAST CREEK

072222903, Lucas, IA

Built 1958 Load: 10.0 t ADT: 90

LOCAL

Poor

Over: DOWD CREEK

085190104, Marshall, IA

Built 1916 Load: 10.0 t ADT: 39

LOCAL

Poor

Over: N MINERVA CREEK

085201601, Marshall, IA

Built 1917 Load: 10.0 t ADT: 21

LCL-ELDERBERRY

Poor

Over: MUD CREEK

073412505, Mills, IA

Built 1960 Load: 10.0 t ADT: 60

LOCAL

Poor

Over: SMALL STREAM

088362903, Sac, IA

Built 1949 Load: 10.0 t ADT: 20

270TH ST

Poor

Over: DRAINAGE DITCH 2

083213501, Story, IA

Built 1951 Load: 10.0 t ADT: 20

LOCAL ROAD

Poor

Over: STREAM

071302701, Union, IA

Built 1900 Load: 10.0 t ADT: 26

FM

Poor

Over: DEER CREEK

077081001, Washington, IA

Built 1953 Load: 10.0 t ADT: 50

LOCAL ROAD

Poor

Over: CREEK

099101301, Winneshiek, IA

Built 1900 Load: 10.0 t ADT: 26

JONQUIL

Poor

Over: ELK CREEK

099212202, Worth, IA

Built 1957 Load: 10.0 t ADT: 21

LOCAL

Poor

Over: WELDON RIVER

070251204, Decatur, IA

Built 1955 Load: 10.1 t ADT: 35

LOCAL

Poor

Over: DRAINAGE DITCH #40

100323301, Emmet, IA

Built 1961 Load: 10.1 t ADT: 11

LOCAL

Poor

Over: CREEK

089413102, Ida, IA

Built 1900 Load: 10.1 t ADT: 26

LOCAL

Poor

Over: OLD MANS CREEK

079102703, Iowa, IA

Built 1967 Load: 10.1 t ADT: 26

FM

Poor

Over: MIDDLE RIVER

076262506, Madison, IA

Built 1932 Load: 10.1 t ADT: 450

FM

Poor

Over: DEER CREEK

080231812, Polk, IA

Built 1950 Load: 10.1 t ADT: 2,421

LOCAL

Poor

Over: STREAM

069230602, Wayne, IA

Built 1975 Load: 10.1 t ADT: 5

230TH ST

Poor

Over: CREEK

091260703, Wright, IA

Built 1900 Load: 10.1 t ADT: 46

LOCAL

Poor

Over: LONG CREEK

070261605, Decatur, IA

Built 1930 Load: 10.2 t ADT: 21

RAIL AVE

Poor

Over: SMALL STREAM

091201404, Franklin, IA

Built 1952 Load: 10.2 t ADT: 29

LARK AVE

Poor

Over: MAYNES CR

091212402, Franklin, IA

Built 1956 Load: 10.2 t ADT: 30

LOCAL

Poor

Over: BRANCH BIG CREEK

072063613, Henry, IA

Built 1985 Load: 10.2 t ADT: 11

LOCAL

Poor

Over: CREEK

073113005, Jefferson, IA

Built 1959 Load: 10.2 t ADT: 60

FM

Poor

Over: ENGLISH RIVER

077111904, Keokuk, IA

Built 1960 Load: 10.2 t ADT: 20

LOCAL

Poor

Over: CREEK

085171402, Marshall, IA

Built 1956 Load: 10.2 t ADT: 16

M AVENUE

Poor

Over: STREAM

069370802, Page, IA

Built 1900 Load: 10.2 t ADT: 11

EVERGREEN AVE

Poor

Over: INDIAN CREEK

093470702, Plymouth, IA

Built 1961 Load: 10.2 t ADT: 5

LOCAL ROAD

Poor

Over: INDIAN CREEK

081220203, Polk, IA

Built 1916 Load: 10.2 t ADT: 45

FM

Poor

Over: STREAM

067282801, Ringgold, IA

Built 1955 Load: 10.2 t ADT: 5

LOCAL

Poor

Over: UNNAMED STREAM

069301001, Ringgold, IA

Built 1957 Load: 10.2 t ADT: 20

LOCAL

Poor

Over: RICHLAND CREEK

082152404, Tama, IA

Built 1900 Load: 10.2 t ADT: 5

LOCAL

Poor

Over: COATES CR

069081701, Van Buren, IA

Built 1959 Load: 10.2 t ADT: 11

LOCAL

Poor

Over: PIKE RUN

099252401, Winnebago, IA

Built 1976 Load: 10.2 t ADT: 5

LOCAL

Poor

Over: CREEK

088462901, Woodbury, IA

Built 1950 Load: 10.2 t ADT: 60

CREEK BRANCH LANE

Poor

Over: PRAIRIE CREEK

087E23105, Dubuque, IA

Built 1900 Load: 10.3 t ADT: 11

E 40TH ST S

Poor

Over: REASNOR CREEK

078190102, Jasper, IA

Built 1978 Load: 10.3 t ADT: 41

LOCAL

Poor

Over: CREEK

071191502, Monroe, IA

Built 1959 Load: 10.3 t ADT: 30

LOCAL

Poor

Over: STREAM

070293504, Ringgold, IA

Built 1988 Load: 10.3 t ADT: 20

LOCAL

Poor

Over: CREEK

069340707, Taylor, IA

Built 1978 Load: 10.3 t ADT: 29

LOCAL

Poor

Over: VILLAGE CREEK

071141302, Wapello, IA

Built 2000 Load: 10.3 t ADT: 30

LOCAL

Poor

Over: KNACK CREEK

086270704, Webster, IA

Built 1915 Load: 10.3 t ADT: 46

LOCAL

Poor

Over: ROCK CREEK

086111801, Benton, IA

Built 1982 Load: 10.4 t ADT: 26

7TH ST

Poor

Over: CEDAR RIVER

000000000, Black Hawk, IA

Built 1930 Load: 10.4 t ADT: 1,531

LOCAL

Poor

Over: BR RACCOON RIVER

092362704, Buena Vista, IA

Built 1928 Load: 10.4 t ADT: 11

LOCAL- F AVE

Poor

Over: SMALL CREEK

090423602, Cherokee, IA

Built 1919 Load: 10.4 t ADT: 30

LOCAL

Poor

Over: BURR OAK CREEK

069122203, Davis, IA

Built 1955 Load: 10.4 t ADT: 20

LOCAL

Poor

Over: DM RIVER

093280602, Humboldt, IA

Built 1900 Load: 10.4 t ADT: 11

LOCAL

Poor

Over: PRAIRIE CREEK

084E23602, Jackson, IA

Built 1971 Load: 10.4 t ADT: 130

Showing 17,651-17,700 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.