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

J-31/185TH ST

Poor

Over: EAST NODAWAY RIVER

069361307, Page, IA

Built 1960 Load: 17.4 t ADT: 190

LOCAL

Poor

Over: STREAM

067200502, Wayne, IA

Built 1980 Load: 17.4 t ADT: 11

FM

Poor

Over: CHARITON RIVER

068172404, Appanoose, IA

Built 1956 Load: 17.5 t ADT: 40

LOCAL

Poor

Over: SMALL STREAM

090180702, Butler, IA

Built 1965 Load: 17.5 t ADT: 41

160TH ST

Poor

Over: STREAM

092150301, Butler, IA

Built 1990 Load: 17.5 t ADT: 41

FM - BOSTON

Poor

Over: NISHNABOTNA RIVER

077361205, Cass, IA

Built 1951 Load: 17.5 t ADT: 131

LOCAL

Poor

Over: SMALL

094143301, Chickasaw, IA

Built 1983 Load: 17.5 t ADT: 47

FM

Poor

Over: JONATHON CREEK

069241805, Decatur, IA

Built 1961 Load: 17.5 t ADT: 40

LOCAL

Poor

Over: CREEK

087E12704, Dubuque, IA

Built 1936 Load: 17.5 t ADT: 110

LOCAL

Poor

Over: CREEK

084E63504, Jackson, IA

Built 1938 Load: 17.5 t ADT: 110

SW 520TH ST

Poor

Over: DEER CREEK

078082001, Johnson, IA

Built 1900 Load: 17.5 t ADT: 35

FM

Poor

Over: OTTER CR

073030304, Louisa, IA

Built 1959 Load: 17.5 t ADT: 80

LOCAL RD

Poor

Over: S FORK CLANTON CREEK

074283606, Madison, IA

Built 1978 Load: 17.5 t ADT: 34

LOCAL

Poor

Over: STREAM

087361302, Sac, IA

Built 1924 Load: 17.5 t ADT: 26

LOCAL

Poor

Over: SALT CREEK

083132307, Tama, IA

Built 1927 Load: 17.5 t ADT: 59

LOCAL ROAD

Poor

Over: WEST BRANCH IOWA RIVER

093241106, Wright, IA

Built 1919 Load: 17.5 t ADT: 11

FM

Poor

Over: N BRANCH SOAP CREEK

070160304, Appanoose, IA

Built 1951 Load: 17.6 t ADT: 45

T47

Poor

Over: SHELL ROCK RIVER

093162702, Butler, IA

Built 1963 Load: 17.6 t ADT: 285

FM - YANKTON

Poor

Over: NODAWAY RIVER

074353101, Cass, IA

Built 1949 Load: 17.6 t ADT: 34

LOCAL - 700TH

Poor

Over: TURKEY CREEK

076350204, Cass, IA

Built 1978 Load: 17.6 t ADT: 21

LOCAL

Poor

Over: SPRING BRANCH CREEK

094132203, Chickasaw, IA

Built 1980 Load: 17.6 t ADT: 5

DONNA REED DR

Poor

Over: OVER UP RR

083391204, Crawford, IA

Built 1935 Load: 17.6 t ADT: 1,846

115TH ST

Poor

Over: WOLF CREEK

070261001, Decatur, IA

Built 1957 Load: 17.6 t ADT: 34

LOCAL

Poor

Over: MUD CREEK

070051503, Henry, IA

Built 1959 Load: 17.6 t ADT: 73

S12TH AVE E

Poor

Over: SMALL STREAM

079180501, Jasper, IA

Built 1921 Load: 17.6 t ADT: 104

LOC 110TH ST

Poor

Over: DD 100 131 93

094273501, Kossuth, IA

Built 1967 Load: 17.6 t ADT: 63

FM

Poor

Over: SOLDIER RIVER

082431501, Monona, IA

Built 1955 Load: 17.6 t ADT: 349

110TH STREET

Poor

Over: MIDDLE TARKIO RIVER

070370701, Page, IA

Built 1949 Load: 17.6 t ADT: 60

FM

Poor

Over: BR BIG CEDAR CK DD #29

090343406, Pocahontas, IA

Built 1966 Load: 17.6 t ADT: 120

MISSOURI AVENUE

Poor

Over: WALNUT CREEK

076381501, Pottawattamie, IA

Built 1953 Load: 17.6 t ADT: 26

LOCAL

Poor

Over: STREAM

068292801, Ringgold, IA

Built 1967 Load: 17.6 t ADT: 11

60TH AVE

Poor

Over: MUD CREEK

079E20602, Scott, IA

Built 1940 Load: 17.6 t ADT: 1,280

110TH ST

Poor

Over: EAST BR INDIAN CREEK

085220701, Story, IA

Built 1968 Load: 17.6 t ADT: 30

LOCAL

Poor

Over: TWELVE MILE CREEK

071282003, Union, IA

Built 1930 Load: 17.6 t ADT: 35

FM

Poor

Over: S RIVER

074251603, Warren, IA

Built 1950 Load: 17.6 t ADT: 100

LOCAL ROAD

Poor

Over: CREEK

098091302, Winneshiek, IA

Built 1962 Load: 17.6 t ADT: 78

LOCAL

Poor

Over: MUD CREEK

084111304, Benton, IA

Built 1945 Load: 17.7 t ADT: 34

LOCAL

Poor

Over: STEIN CK

084120502, Benton, IA

Built 1948 Load: 17.7 t ADT: 15

LOCAL

Poor

Over: COLDWATER CREEK

093180505, Butler, IA

Built 1951 Load: 17.7 t ADT: 11

LOCAL

Poor

Over: EAST WAPSIPINICON

094110702, Chickasaw, IA

Built 1900 Load: 17.7 t ADT: 98

LOCAL

Poor

Over: SMALL CREEK

072251103, Clarke, IA

Built 1900 Load: 17.7 t ADT: 40

LOCAL

Poor

Over: MIDDLE RIVER

078321602, Guthrie, IA

Built 1962 Load: 17.7 t ADT: 50

FM

Poor

Over: DRAINAGE DITCH

088232502, Hamilton, IA

Built 1949 Load: 17.7 t ADT: 15

FM 170TH ST

Poor

Over: BOHEMIAN CREEK

098113401, Howard, IA

Built 1959 Load: 17.7 t ADT: 80

LOCAL

Poor

Over: CREEK

073112703, Jefferson, IA

Built 1957 Load: 17.7 t ADT: 30

240TH AVE

Poor

Over: LINDNER CREEK

097273602, Kossuth, IA

Built 1972 Load: 17.7 t ADT: 620

LOCAL

Poor

Over: CARRUTHERS CREEK

073201202, Lucas, IA

Built 1981 Load: 17.7 t ADT: 30

FIELD ENT.

Poor

Over: DRAINAGE (SDB)

070390604, Page, IA

Built 1900 Load: 17.7 t ADT: 10

TEAKWOOD ROAD

Poor

Over: NEOLA CREEK

077422401, Pottawattamie, IA

Built 1978 Load: 17.7 t ADT: 60

LOCAL

Poor

Over: FOUR MILE CRK

086152802, Tama, IA

Built 1981 Load: 17.7 t ADT: 26

Showing 18,851-18,900 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.