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 RD

Poor

Over: TARKIO CREEK

071372005, Montgomery, IA

Built 1966 Load: 30.6 t ADT: 11

FM

Poor

Over: LITTLE CEDAR CREEK

090341002, Pocahontas, IA

Built 1968 Load: 30.6 t ADT: 658

FM

Poor

Over: PILOT CREEK

092310407, Pocahontas, IA

Built 1975 Load: 30.6 t ADT: 509

236TH AVE

Poor

Over: SILVER CREEK

100092416, Winneshiek, IA

Built 1928 Load: 30.6 t ADT: 187

FM

Poor

Over: PRATT CREEK

086113602, Benton, IA

Built 1956 Load: 30.7 t ADT: 540

LOCAL

Poor

Over: MILLER CREEK

078092302, Iowa, IA

Built 1900 Load: 30.7 t ADT: 110

FM

Poor

Over: BEAR CREEK

080182401, Jasper, IA

Built 1914 Load: 30.7 t ADT: 45

LOCAL

Poor

Over: CHERRY CREEK

080190703, Jasper, IA

Built 1927 Load: 30.7 t ADT: 30

LOCAL

Poor

Over: SMALL STREAM

080201802, Jasper, IA

Built 1917 Load: 30.7 t ADT: 51

W 130TH ST N

Poor

Over: SMALL STREAM

080210404, Jasper, IA

Built 1925 Load: 30.7 t ADT: 21

LOCAL

Poor

Over: BRANCH SNIPE CREEK

082192702, Marshall, IA

Built 1920 Load: 30.7 t ADT: 11

LOCAL

Poor

Over: LINN CREEK

083190401, Marshall, IA

Built 1916 Load: 30.7 t ADT: 21

LOCAL

Poor

Over: CREEK

083190503, Marshall, IA

Built 1918 Load: 30.7 t ADT: 35

LOCAL

Poor

Over: BRANCH NORTH TIMBER CRK

083202401, Marshall, IA

Built 1924 Load: 30.7 t ADT: 41

FM

Poor

Over: CEDAR RIVER

078033601, Muscatine, IA

Built 1966 Load: 30.7 t ADT: 990

LOCAL SEC RD

Poor

Over: WILLOW CR

094400203, O'Brien, IA

Built 1919 Load: 30.7 t ADT: 26

LOCAL

Poor

Over: SKILLET CREEK

086281104, Webster, IA

Built 1919 Load: 30.7 t ADT: 46

WINSLOW RD

Poor

Over: TRIB W FORK CEDAR RIVER

90-14-08-03-10, Black Hawk, IA

Built 1966 Load: 30.8 t ADT: 255

FM

Poor

Over: SOUTH CHEQUEST CREEK

069120802, Davis, IA

Built 1981 Load: 30.8 t ADT: 310

FM

Poor

Over: CREEK

088023201, Dubuque, IA

Built 1962 Load: 30.8 t ADT: 490

FM

Poor

Over: CREEK

089010204, Dubuque, IA

Built 1950 Load: 30.8 t ADT: 39

DYERSVILLE EAST RD

Poor

Over: CREEK

089022704, Dubuque, IA

Built 1964 Load: 30.8 t ADT: 511

FM

Poor

Over: SOLDIER CREEK

100331303, Emmet, IA

Built 1967 Load: 30.8 t ADT: 190

ABBEY RD.

Poor

Over: BEAVER CREEK

094072401, Fayette, IA

Built 1949 Load: 30.8 t ADT: 128

LOCAL

Poor

Over: LITTLE WOLF CREEK

086170201, Grundy, IA

Built 1976 Load: 30.8 t ADT: 33

FM

Poor

Over: BLACK HAWK CREEK

087152202, Grundy, IA

Built 1973 Load: 30.8 t ADT: 412

LOCAL

Poor

Over: MOSQUITO CREEK

087163302, Grundy, IA

Built 1983 Load: 30.8 t ADT: 33

LOCAL

Poor

Over: STREAM

080100502, Iowa, IA

Built 1976 Load: 30.8 t ADT: 20

FM SW BAYRTWN R

Poor

Over: STREAM

078072303, Johnson, IA

Built 1964 Load: 30.8 t ADT: 240

390TH

Poor

Over: ROCK CREEK

098180701, Mitchell, IA

Built 1973 Load: 30.8 t ADT: 216

RAMPART AVE

Poor

Over: SMALL STREAM

099161202, Mitchell, IA

Built 1974 Load: 30.8 t ADT: 59

FM

Poor

Over: BUCK CREEK

078161203, Poweshiek, IA

Built 1969 Load: 30.8 t ADT: 2,000

FM

Poor

Over: SMALL STREAM

078161205, Poweshiek, IA

Built 1969 Load: 30.8 t ADT: 2,000

FM

Poor

Over: RACCOON RIVER

087361301, Sac, IA

Built 1974 Load: 30.8 t ADT: 110

SPRUCE

Poor

Over: DRAINAGE DITCH

100193104, Worth, IA

Built 1955 Load: 30.8 t ADT: 30

FM

Poor

Over: CREEK

088422402, Woodbury, IA

Built 1978 Load: 30.9 t ADT: 50

FM

Poor

Over: STREAM

070170103, Appanoose, IA

Built 1972 Load: 31.0 t ADT: 100

LOCAL RD

Poor

Over: BRANCH BLACKHAWK CREEK

088172601, Grundy, IA

Built 1956 Load: 31.0 t ADT: 15

LOCAL

Poor

Over: JORDAN CREEK

084152201, Tama, IA

Built 1940 Load: 31.0 t ADT: 39

N 15TH ST

Poor

Over: SOLDIER CREEK

089281700, Webster, IA

Built 1974 Load: 31.0 t ADT: 8,798

FM (LWC)

Poor

Over: SMALL STREAM

085120502, Benton, IA

Built 1980 Load: 31.1 t ADT: 20

LOCAL

Poor

Over: MONTGOMERY CREEK

085253102, Boone, IA

Built 1915 Load: 31.1 t ADT: 5

LOCAL ROAD

Poor

Over: SOLDIER RIVER

086392802, Ida, IA

Built 1900 Load: 31.1 t ADT: 11

FA-GASTON AVE

Poor

Over: KEG CREEK

072420603, Mills, IA

Built 1967 Load: 31.1 t ADT: 1,065

LOCAL

Poor

Over: CRANE CREEK

095110401, Chickasaw, IA

Built 1980 Load: 31.2 t ADT: 41

LOCAL

Poor

Over: STREAM

068171604, Appanoose, IA

Built 1900 Load: 31.3 t ADT: 51

LOCAL

Poor

Over: BR WILDCAT CK

084102702, Benton, IA

Built 1957 Load: 31.3 t ADT: 15

310TH STREET

Poor

Over: MID TARKIO CREEK

067392701, Page, IA

Built 1968 Load: 31.3 t ADT: 329

FM

Poor

Over: BLACK HAWK CREEK

087152002, Grundy, IA

Built 1979 Load: 31.4 t ADT: 687

FM 150TH ST

Poor

Over: LITTLE WAPSIPINICON

098142301, Howard, IA

Built 1967 Load: 31.4 t ADT: 452

Showing 20,351-20,400 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.