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

FM

Poor

Over: ELK CREEK

068271202, Decatur, IA

Built 1900 Load: 13.0 t ADT: 40

LOCAL

Poor

Over: SMALL CREEK

084E61103, Jackson, IA

Built 1920 Load: 13.0 t ADT: 20

LOCAL

Poor

Over: SMALL STREAM

075033104, Louisa, IA

Built 1930 Load: 13.0 t ADT: 11

290TH ST

Poor

Over: DRAINAGE DITCH #2

074160907, Mahaska, IA

Built 1900 Load: 13.0 t ADT: 45

LOCAL

Poor

Over: SMALL STREAM

076211803, Marion, IA

Built 1984 Load: 13.0 t ADT: 91

LOCAL

Poor

Over: SOUTH TIMBER CREEK

082180104, Marshall, IA

Built 1939 Load: 13.0 t ADT: 16

280TH ST

Poor

Over: MUD CREEK

090440601, Plymouth, IA

Built 1900 Load: 13.0 t ADT: 26

FM

Poor

Over: BIG CEDAR CK DD #41

093341502, Pocahontas, IA

Built 1969 Load: 13.0 t ADT: 379

LOCAL

Poor

Over: E BIG CREEK

067282401, Ringgold, IA

Built 1958 Load: 13.0 t ADT: 5

LOCAL

Poor

Over: STREAM

069313304, Ringgold, IA

Built 1954 Load: 13.0 t ADT: 5

LOCAL

Poor

Over: BRANCH WOLF CREEK

086162602, Tama, IA

Built 1945 Load: 13.0 t ADT: 39

LOCAL RD

Poor

Over: SMALL STREAM

084130601, Tama, IA

Built 1930 Load: 13.0 t ADT: 33

LOCAL

Poor

Over: TRIB DESMOINES RIVER

068083004, Van Buren, IA

Built 1966 Load: 13.0 t ADT: 26

LOCAL

Poor

Over: DRAINAGE DITCH

092371202, Buena Vista, IA

Built 1971 Load: 13.1 t ADT: 34

LOCAL - 555TH

Poor

Over: CAMP CREEK

076370504, Cass, IA

Built 1976 Load: 13.1 t ADT: 21

LOCAL

Poor

Over: CROOKED CREEK

079020504, Cedar, IA

Built 1935 Load: 13.1 t ADT: 15

LOCAL

Poor

Over: BIG CREEK

084392205, Crawford, IA

Built 1949 Load: 13.1 t ADT: 30

LOCAL

Poor

Over: FLOOD CREEK

096173001, Floyd, IA

Built 1900 Load: 13.1 t ADT: 49

LOCAL

Poor

Over: SMALL CREEK

078331702, Guthrie, IA

Built 1949 Load: 13.1 t ADT: 40

LOCAL 120TH ST

Poor

Over: LITTLE SIOUX RIVER

081440703, Harrison, IA

Built 1971 Load: 13.1 t ADT: 40

FM

Poor

Over: KANARANZI CREEK

100452202, Lyon, IA

Built 1959 Load: 13.1 t ADT: 369

LOCAL

Poor

Over: S LIZARD CREEK DD#22

091332601, Pocahontas, IA

Built 1917 Load: 13.1 t ADT: 11

HEMLOCK AVE

Poor

Over: GRAYBILL CREEK

075391607, Pottawattamie, IA

Built 1947 Load: 13.1 t ADT: 5

BIRCH AVENUE

Poor

Over: SIN CREEK

073351706, Adams, IA

Built 1964 Load: 13.2 t ADT: 5

LOCAL

Poor

Over: SMALL CREEK

084120201, Benton, IA

Built 1976 Load: 13.2 t ADT: 11

LOCAL - MEMPHIS

Poor

Over: TURKEY CR

075360602, Cass, IA

Built 1900 Load: 13.2 t ADT: 5

LOCAL - NSHNA V

Poor

Over: INDIAN CREEK

075370803, Cass, IA

Built 1920 Load: 13.2 t ADT: 26

LOCAL

Poor

Over: BR E FK WAPSIPINICON RVR

096131301, Chickasaw, IA

Built 1982 Load: 13.2 t ADT: 59

200TH ST

Poor

Over: VOLGA RIVER

094103401, Fayette, IA

Built 1914 Load: 13.2 t ADT: 33

1840 QUAIL AVE

Poor

Over: DD #6

095242302, Hancock, IA

Built 1970 Load: 13.2 t ADT: 21

288TH ST

Poor

Over: MOSQUITO CREEK

078410409, Harrison, IA

Built 1940 Load: 13.2 t ADT: 34

TAYLOR AVE

Poor

Over: PIGEON CREEK

078420102, Harrison, IA

Built 1920 Load: 13.2 t ADT: 40

FM

Poor

Over: BACON CREEK

088410504, Ida, IA

Built 1900 Load: 13.2 t ADT: 199

LOCAL

Poor

Over: MITCHELL CREEK

072100403, Jefferson, IA

Built 1955 Load: 13.2 t ADT: 20

P 64 210TH AVE

Poor

Over: LINDER CREEK

097273302, Kossuth, IA

Built 1947 Load: 13.2 t ADT: 359

LOCAL

Poor

Over: CHARITON RIVER

071233103, Lucas, IA

Built 1970 Load: 13.2 t ADT: 20

LOCAL

Poor

Over: CALHOUN CREEK

077200401, Marion, IA

Built 1953 Load: 13.2 t ADT: 16

TIMBER AVE

Poor

Over: WAPSIPINICON RIVER

100151702, Mitchell, IA

Built 1959 Load: 13.2 t ADT: 29

F AVENUE

Poor

Over: STREAM

068391302, Page, IA

Built 1951 Load: 13.2 t ADT: 50

LOCAL

Poor

Over: N LIZARD CREEK

093332201, Pocahontas, IA

Built 1921 Load: 13.2 t ADT: 20

210TH STREET

Poor

Over: PIGEON CREEK

077432708, Pottawattamie, IA

Built 1952 Load: 13.2 t ADT: 40

LOCAL

Poor

Over: SOUTH ENGLISH RIVER

078143502, Poweshiek, IA

Built 1974 Load: 13.2 t ADT: 40

LOCAL

Poor

Over: NORTH WALNUT CREEK

081140202, Poweshiek, IA

Built 1955 Load: 13.2 t ADT: 30

FM

Poor

Over: BRANCH OTTER CREEK

083141703, Tama, IA

Built 1927 Load: 13.2 t ADT: 79

LOCAL

Poor

Over: SPRING CREEK

073130803, Wapello, IA

Built 1920 Load: 13.2 t ADT: 26

FM

Poor

Over: SOUTH CHARITON RIVER

069223202, Wayne, IA

Built 1918 Load: 13.2 t ADT: 40

LOCAL ROAD

Poor

Over: CREEK

100073303, Winneshiek, IA

Built 1900 Load: 13.2 t ADT: 26

240TH STREET

Poor

Over: STREAM

071351303, Adams, IA

Built 1979 Load: 13.3 t ADT: 79

LOCAL

Poor

Over: STREAM

083090801, Benton, IA

Built 1959 Load: 13.3 t ADT: 50

LOCAL

Poor

Over: TRIB OF DICKENSON BRANCH

067261005, Decatur, IA

Built 1965 Load: 13.3 t ADT: 46

Showing 18,001-18,050 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.