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

N ISETT AVE

Poor

Over: MOSQUITO CREEK

078022602, Muscatine, IA

Built 1956 ADT: 51

LOCAL

Poor

Over: SMALL

078033403, Muscatine, IA

Built 1978 ADT: 15

LOCAL

Poor

Over: OCHEYEDAN RIVER

098390604, Osceola, IA

Built 1900 ADT: 11

LOCAL

Poor

Over: LITTLE OCHEYDAN RIVER

098402301, Osceola, IA

Built 1900 ADT: 5

IVY AVENUE

Poor

Over: LONG BRANCH

067381606, Page, IA

Built 1955 ADT: 11

320TH STREET

Poor

Over: MIDDLE TARKIO CREEK

067392705, Page, IA

Built 1953 ADT: 15

UPLAND AVENUE

Poor

Over: STREAM

068362104, Page, IA

Built 1986 ADT: 15

260TH STREET

Poor

Over: MIDDLE MILL CREEK

068373305, Page, IA

Built 1955 ADT: 15

KIWI AVENUE

Poor

Over: LONG BRANCH

068383506, Page, IA

Built 1950 ADT: 11

FIELD ENTRANCE

Poor

Over: STREAM (SDB)

069382002, Page, IA

Built 1900 ADT: 10

LOCAL

Poor

Over: DD

096330901, Palo Alto, IA

Built 1915 ADT: 41

LOCAL

Poor

Over: NORTH LIZARD CREEK

090310201, Pocahontas, IA

Built 1970 ADT: 60

LOCAL

Poor

Over: LITTLE CEDAR CREEK

090341501, Pocahontas, IA

Built 1953 ADT: 20

LOCAL

Poor

Over: N LIZARD CREEK

091312402, Pocahontas, IA

Built 1900 ADT: 30

FM

Poor

Over: LIZARD CK DD #54

091313101, Pocahontas, IA

Built 1964 ADT: 429

LOCAL

Poor

Over: BR BIG CEDAR CR DD #21

091330701, Pocahontas, IA

Built 1952 ADT: 5

LOCAL

Poor

Over: LITTLE CEDAR CREEK

091340801, Pocahontas, IA

Built 1954 ADT: 11

LOCAL

Poor

Over: LIZARD CREEK

092330501, Pocahontas, IA

Built 1978 ADT: 15

LOCAL

Poor

Over: LIZARD CREEK

092332302, Pocahontas, IA

Built 1955 ADT: 11

LOCAL RD

Poor

Over: LIZARD CK DD #53

092332402, Pocahontas, IA

Built 1975 ADT: 40

LOCAL

Poor

Over: LIZARD CREEK

092332501, Pocahontas, IA

Built 1954 ADT: 30

LOCAL

Poor

Over: BR BIG CEDAR CR DD #21

092333001, Pocahontas, IA

Built 1955 ADT: 11

LOCAL

Poor

Over: LITTLE CEDAR CREEK

092340802, Pocahontas, IA

Built 1952 ADT: 30

LOCAL

Poor

Over: LITTLE CEDAR CREEK

092343201, Pocahontas, IA

Built 1953 ADT: 30

FM SW MCKINLEY

Poor

Over: FRINK CREEK

078252500, Polk, IA

Built 1937 ADT: 245

LOCAL ROAD

Poor

Over: FOUR MILE CREEK

080233005, Polk, IA

Built 1941 ADT: 89

432ND STREET

Poor

Over: JORDAN CREEK

074391704, Pottawattamie, IA

Built 1968 ADT: 15

INCA LANE

Poor

Over: PIGEON CREEK

076443403, Pottawattamie, IA

Built 1924 ADT: 11

F62

Poor

Over: SUGAR CREEK

078160707, Poweshiek, IA

Built 1958 ADT: 1,170

LOCAL

Poor

Over: STREAM

078150803, Poweshiek, IA

Built 1959 ADT: 11

LOCAL

Poor

Over: STREAM

078162706, Poweshiek, IA

Built 1953 ADT: 60

LOCAL

Poor

Over: STREAM

079130701, Poweshiek, IA

Built 1974 ADT: 30

LOCAL

Poor

Over: STREAM

079141604, Poweshiek, IA

Built 1952 ADT: 60

LOCAL

Poor

Over: STREAM

079142601, Poweshiek, IA

Built 1968 ADT: 30

LOCAL

Poor

Over: N ENGLISH RIVER

079151502, Poweshiek, IA

Built 1955 ADT: 45

LOCAL

Poor

Over: SUGAR CREEK

079162003, Poweshiek, IA

Built 1923 ADT: 50

LOCAL

Poor

Over: BUCK CREEK

079162701, Poweshiek, IA

Built 1965 ADT: 60

370TH AVE

Poor

Over: STONY CREEK

080141003, Poweshiek, IA

Built 1967 ADT: 40

LOCAL

Poor

Over: SMALL STREAM

081131202, Poweshiek, IA

Built 1950 ADT: 34

FM

Poor

Over: WALNUT CREEK

081152002, Poweshiek, IA

Built 1928 ADT: 15

LOCAL

Poor

Over: STREAM

067282201, Ringgold, IA

Built 1953 ADT: 5

LOCAL

Poor

Over: LOTTS CREEK

067291204, Ringgold, IA

Built 1961 ADT: 11

LOCAL

Poor

Over: M FK GRAND RIVER

067300903, Ringgold, IA

Built 1963 ADT: 20

LOCAL

Poor

Over: STREAM

067312503, Ringgold, IA

Built 1957 ADT: 11

LOCAL

Poor

Over: LOTTS CREEK

068280601, Ringgold, IA

Built 1940 ADT: 11

LOCAL

Poor

Over: E FK GRAND RIVER

068291501, Ringgold, IA

Built 1962 ADT: 5

LOCAL

Poor

Over: W FK GRAND RIVER

068301903, Ringgold, IA

Built 1940 ADT: 5

FM

Poor

Over: OVER UP RR

068311404, Ringgold, IA

Built 1940 ADT: 379

LOCAL

Poor

Over: LOTTS CREEK

069280401, Ringgold, IA

Built 1952 ADT: 5

LOCAL

Poor

Over: LOTTS CREEK

069280901, Ringgold, IA

Built 1949 ADT: 5

Showing 16,951-17,000 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.