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: CREEK

073260303, Clarke, IA

Built 1980 Load: 26.5 t ADT: 60

95TH ST

Poor

Over: SMALL STREAM

091193003, Franklin, IA

Built 1952 Load: 26.5 t ADT: 51

180TH ST

Poor

Over: DRAINAGE DITCH #10

095262903, Hancock, IA

Built 1994 Load: 26.5 t ADT: 21

SIOUX AVE

Poor

Over: STREAM

079053102, Johnson, IA

Built 1966 Load: 26.5 t ADT: 234

FM

Poor

Over: DRAINAGE

074270803, Madison, IA

Built 1930 Load: 26.5 t ADT: 40

FM

Poor

Over: DD #123

094310502, Palo Alto, IA

Built 1966 Load: 26.5 t ADT: 20

LOCAL

Poor

Over: BRANCH SUGAR CREEK

084160602, Tama, IA

Built 1920 Load: 26.5 t ADT: 29

LOCAL

Poor

Over: BEAVER CREEK

084282901, Boone, IA

Built 1915 Load: 26.6 t ADT: 11

LOC FINLEY AVE

Poor

Over: LIME CR

087102710, Buchanan, IA

Built 1925 Load: 26.6 t ADT: 11

FM

Poor

Over: MAPLE RIVER

090382002, Buena Vista, IA

Built 1964 Load: 26.6 t ADT: 450

T64

Poor

Over: SMALL STREAM

093150602, Butler, IA

Built 1968 Load: 26.6 t ADT: 776

LOCAL-520TH ST

Poor

Over: WILLOW CR

092413001, Cherokee, IA

Built 1973 Load: 26.6 t ADT: 26

FM 450TH ST

Poor

Over: GREY CREEK

093402201, Cherokee, IA

Built 1970 Load: 26.6 t ADT: 319

FM 310TH AVE

Poor

Over: DITCH NO.60

096352202, Clay, IA

Built 1967 Load: 26.6 t ADT: 259

FM 350TH ST

Poor

Over: SPRING CREEK

096381403, Clay, IA

Built 1963 Load: 26.6 t ADT: 1,806

KAHLE AVE

Poor

Over: CARLAN CR

091030304, Clayton, IA

Built 1900 Load: 26.6 t ADT: 21

FM

Poor

Over: SMALL STREAM

085412101, Crawford, IA

Built 1967 Load: 26.6 t ADT: 627

285 STREET

Poor

Over: #6 DITCH

067420703, Fremont, IA

Built 1976 Load: 26.6 t ADT: 26

FM 250TH ST

Poor

Over: UNNAMED CREEK

096282401, Kossuth, IA

Built 1966 Load: 26.6 t ADT: 40

FM

Poor

Over: OVER-FLOW-NORTH RIVER

077263102, Madison, IA

Built 1970 Load: 26.6 t ADT: 880

LOCAL

Poor

Over: LITTLE MUCHAKINOCK

075153104, Mahaska, IA

Built 1965 Load: 26.6 t ADT: 290

FM

Poor

Over: DRAINAGE DITCH 2

076040701, Muscatine, IA

Built 1969 Load: 26.6 t ADT: 840

FM

Poor

Over: PILOT CREEK

092310502, Pocahontas, IA

Built 1970 Load: 26.6 t ADT: 439

FM

Poor

Over: CROOKED CK DD #60

092321101, Pocahontas, IA

Built 1966 Load: 26.6 t ADT: 11

FM

Poor

Over: SOUTH ENGLISH RIVER

078142802, Poweshiek, IA

Built 1964 Load: 26.6 t ADT: 480

LOCAL

Poor

Over: STREAM

081130905, Poweshiek, IA

Built 1981 Load: 26.6 t ADT: 11

FM

Poor

Over: PLATTE RIVER

069312201, Ringgold, IA

Built 1962 Load: 26.6 t ADT: 40

FM

Poor

Over: INDIAN CREEK

094472602, Sioux, IA

Built 1967 Load: 26.6 t ADT: 649

IRR FM

Poor

Over: BRANCH OF RICHLAND CREEK

082153303, Tama, IA

Built 1967 Load: 26.6 t ADT: 304

LOCAL

Poor

Over: TRIB DES MOINES RIVER

070110703, Van Buren, IA

Built 1950 Load: 26.6 t ADT: 60

LOCAL

Poor

Over: BR TO DES MOINES RIVER

072133107, Wapello, IA

Built 1968 Load: 26.6 t ADT: 590

FM

Poor

Over: CEDAR RIVER

081042803, Cedar, IA

Built 1971 Load: 26.7 t ADT: 950

S 68TH AVE E

Poor

Over: SMALL STREAM

079183303, Jasper, IA

Built 1997 Load: 26.7 t ADT: 50

LOCAL

Poor

Over: BRUSH CREEK

077202303, Marion, IA

Built 1910 Load: 26.7 t ADT: 41

LCL-MERRILL RD

Poor

Over: DRAINAGE

071410104, Mills, IA

Built 1964 Load: 26.7 t ADT: 50

FM

Poor

Over: PRATT CREEK

085122702, Benton, IA

Built 1971 Load: 26.8 t ADT: 15

OXLEY RD

Poor

Over: INDIAN CREEK

88-11-09-02-10, Black Hawk, IA

Built 1900 Load: 26.8 t ADT: 26

LOCAL

Poor

Over: CREEK

094142401, Chickasaw, IA

Built 1953 Load: 26.8 t ADT: 47

FM

Poor

Over: BRANCH BEAVER CREEK

089171502, Grundy, IA

Built 1966 Load: 26.8 t ADT: 393

175TH ST

Poor

Over: BR MEAD CREEK

098133103, Howard, IA

Built 1989 Load: 26.8 t ADT: 31

LOC HOWARD AVE

Poor

Over: CRANE CREEK

099132908, Howard, IA

Built 1942 Load: 26.8 t ADT: 82

HIGHWAY F-62 E

Poor

Over: ELK CREEK

078181003, Jasper, IA

Built 1962 Load: 26.8 t ADT: 1,370

FM

Poor

Over: ROCK CREEK

081172001, Jasper, IA

Built 1963 Load: 26.8 t ADT: 530

LOCAL

Poor

Over: DRAINAGE

077143204, Mahaska, IA

Built 1950 Load: 26.8 t ADT: 45

FM

Poor

Over: BUCK CREEK

077150805, Mahaska, IA

Built 1957 Load: 26.8 t ADT: 30

LOCAL

Poor

Over: BR MINERVA CR

085200903, Marshall, IA

Built 1984 Load: 26.8 t ADT: 26

LOCAL

Poor

Over: TRIB TO SOLDIER RIVER

084421103, Monona, IA

Built 1990 Load: 26.8 t ADT: 20

190TH ST

Poor

Over: WESTFIELD CREEK

092481901, Plymouth, IA

Built 1951 Load: 26.8 t ADT: 26

LOCAL

Poor

Over: SMALL

081130909, Poweshiek, IA

Built 1978 Load: 26.8 t ADT: 15

WALNUT AVENUE

Poor

Over: STREAM

073322604, Adams, IA

Built 1967 Load: 26.9 t ADT: 71

Showing 20,051-20,100 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.