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: KILGORE CREEK

068251503, Decatur, IA

Built 1979 Load: 17.2 t ADT: 46

300TH ST

Poor

Over: SMALL STREAM

087051805, Delaware, IA

Built 1930 Load: 17.2 t ADT: 59

LOCAL

Poor

Over: CREEK

087E22904, Dubuque, IA

Built 1940 Load: 17.2 t ADT: 20

LOCAL

Poor

Over: LITTLE MAQUOKETA RIVER

088010304, Dubuque, IA

Built 1952 Load: 17.2 t ADT: 128

RIVERVIEW DRIVE

Poor

Over: LITTLE TURKEY RIVER

000000000, Fayette, IA

Built 1954 Load: 17.2 t ADT: 1,344

LOCAL

Poor

Over: WINNEBAGO RIVER

095180801, Floyd, IA

Built 1900 Load: 17.2 t ADT: 59

BEEDS LAKE DR

Poor

Over: SPRING CR

092202001, Franklin, IA

Built 1967 Load: 17.2 t ADT: 227

LOCAL

Poor

Over: IOWAY CREEK

086253002, Hamilton, IA

Built 1952 Load: 17.2 t ADT: 15

LOCAL

Poor

Over: ODEBOLT CREEK

087392004, Ida, IA

Built 1957 Load: 17.2 t ADT: 50

FM

Poor

Over: OLD MANS CREEK

079093104, Iowa, IA

Built 1949 Load: 17.2 t ADT: 30

S 12TH AVE E

Poor

Over: ROCK CREEK

079170501, Jasper, IA

Built 1948 Load: 17.2 t ADT: 35

LOCAL

Poor

Over: CREEK

072113302, Jefferson, IA

Built 1900 Load: 17.2 t ADT: 110

LOCAL

Poor

Over: SPRING CREEK

075151703, Mahaska, IA

Built 1964 Load: 17.2 t ADT: 90

LOCAL

Poor

Over: BRUSH CREEK

082171603, Marshall, IA

Built 1917 Load: 17.2 t ADT: 16

FM

Poor

Over: LINN CR

083180902, Marshall, IA

Built 1956 Load: 17.2 t ADT: 369

230TH ST

Poor

Over: RATHBURN CREEK

091430801, Plymouth, IA

Built 1900 Load: 17.2 t ADT: 30

270TH ST

Poor

Over: CARTER CREEK

091463503, Plymouth, IA

Built 1900 Load: 17.2 t ADT: 11

OTTER AVE

Poor

Over: WILLOW CREEK

093442902, Plymouth, IA

Built 1949 Load: 17.2 t ADT: 15

LOCAL

Poor

Over: WALNUT CREEK

081130104, Poweshiek, IA

Built 1951 Load: 17.2 t ADT: 40

FM

Poor

Over: W FORK GRAND RIVER

067311501, Ringgold, IA

Built 1956 Load: 17.2 t ADT: 219

FM

Poor

Over: CREEK

067341002, Taylor, IA

Built 1960 Load: 17.2 t ADT: 5

FM

Poor

Over: N. FORK LONG CREEK

076072802, Washington, IA

Built 1925 Load: 17.2 t ADT: 160

LOCAL

Poor

Over: STREAM

087420602, Woodbury, IA

Built 1942 Load: 17.2 t ADT: 5

FM

Poor

Over: ROCK CREEK

088430603, Woodbury, IA

Built 1900 Load: 17.2 t ADT: 199

LOCAL

Poor

Over: BEAVER CREEK

084282802, Boone, IA

Built 1900 Load: 17.3 t ADT: 11

FM

Poor

Over: SMALL STREAM

091171704, Butler, IA

Built 1969 Load: 17.3 t ADT: 373

FM

Poor

Over: LONG CREEK

070260903, Decatur, IA

Built 1957 Load: 17.3 t ADT: 26

MIDDLE ROAD

Poor

Over: BRUSH CREEK

APPROX. 600' E. OF RD. H, Des Moines, IA

Built 1946 Load: 17.3 t ADT: 10

270TH ST

Poor

Over: CREEK

097350301, Dickinson, IA

Built 1926 Load: 17.3 t ADT: 41

NEPTUNE ST

Poor

Over: S. SKUNK RIVER

079201405, Jasper, IA

Built 1948 Load: 17.3 t ADT: 60

LOCAL

Poor

Over: SMALL STREAM

081191404, Jasper, IA

Built 1939 Load: 17.3 t ADT: 30

FM

Poor

Over: DRAINAGE

074271004, Madison, IA

Built 1940 Load: 17.3 t ADT: 89

FM

Poor

Over: HOWERDON CREEK

076292202, Madison, IA

Built 1972 Load: 17.3 t ADT: 597

BANCROFT AVE

Poor

Over: BIG SLOUGH CREEK

077041706, Muscatine, IA

Built 1937 Load: 17.3 t ADT: 45

C AVENUE

Poor

Over: WEST TARKIO RIVER

067391602, Page, IA

Built 1957 Load: 17.3 t ADT: 60

J-28 / 170TH ST

Poor

Over: TARKIO CREEK

069381101, Page, IA

Built 1956 Load: 17.3 t ADT: 60

G AVENUE

Poor

Over: W TARKIO RIVER

069382002, Page, IA

Built 1972 Load: 17.3 t ADT: 20

190TH STREET

Poor

Over: MIDDLE TARKIO CREEK

069382303, Page, IA

Built 1956 Load: 17.3 t ADT: 139

190TH ST

Poor

Over: MINK CREEK

092462201, Plymouth, IA

Built 1947 Load: 17.3 t ADT: 15

FM

Poor

Over: CAMP CREEK

079222604, Polk, IA

Built 1950 Load: 17.3 t ADT: 459

FM

Poor

Over: LOTTS CREEK

067292501, Ringgold, IA

Built 1957 Load: 17.3 t ADT: 11

LOCAL

Poor

Over: PLATTE RIVER

069313401, Ringgold, IA

Built 1955 Load: 17.3 t ADT: 29

LOCAL

Poor

Over: ODEBOLT CREEK

087382804, Sac, IA

Built 1981 Load: 17.3 t ADT: 15

LOCAL

Poor

Over: DRY CK

083091401, Benton, IA

Built 1973 Load: 17.4 t ADT: 50

LOCAL

Poor

Over: N FORK CAMP CR

088341102, Calhoun, IA

Built 1900 Load: 17.4 t ADT: 26

LOCAL

Poor

Over: ROCK CREEK

081031104, Cedar, IA

Built 1915 Load: 17.4 t ADT: 30

FM

Poor

Over: BRUSHY CREEK

081333606, Guthrie, IA

Built 1952 Load: 17.4 t ADT: 71

LOCAL

Poor

Over: S BR BIG CREEK

071050205, Henry, IA

Built 1996 Load: 17.4 t ADT: 5

LOCAL 90TH ST

Poor

Over: BR CRANE CREEK

099132101, Howard, IA

Built 1970 Load: 17.4 t ADT: 16

LOCAL

Poor

Over: BRANCH N SKUNK RIVER

082191902, Marshall, IA

Built 1954 Load: 17.4 t ADT: 15

Showing 18,801-18,850 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.