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

OAKWOOD ST

Poor

Over: WEST CREEK

073262903, Clarke, IA

Built 1952 ADT: 11

LOCAL

Poor

Over: SMALL CREEK

073272301, Clarke, IA

Built 1972 ADT: 15

LOCAL

Poor

Over: STREAM

073273103, Clarke, IA

Built 1900 ADT: 26

LOCAL

Poor

Over: SOUTH WEST CREEK

073253105, Clarke, IA

Built 1900 ADT: 11

LOCAL

Poor

Over: SMALL STREAM

073272903, Clarke, IA

Built 1900 ADT: 11

280TH AVE

Poor

Over: ELK CREEK

095353004, Clay, IA

Built 1917 ADT: 11

210TH AVE

Poor

Over: LITTLE SIOUX RIVER

096370102, Clay, IA

Built 1915 ADT: 62

235TH STREET

Poor

Over: WAPSIPINICON RIVER

081E11105, Clinton, IA

Built 1930 ADT: 100

235TH STREET

Poor

Over: BRANCH OF WAPSIPINICON

081E11203, Clinton, IA

Built 1930 ADT: 100

LOCAL

Poor

Over: MILLER CREEK

084373004, Crawford, IA

Built 1981 ADT: 58

FM

Poor

Over: EAST SOLDIER RIVER

084411302, Crawford, IA

Built 1960 ADT: 499

LOCAL

Poor

Over: NORTH RACCOON RIVER

A21600635, Dallas, IA

Built 1882 ADT: 153

COUNTY ROAD

Poor

Over: MOSQUITO CREEK

079290805, Dallas, IA

Built 1900 ADT: 21

LOCAL

Poor

Over: BEAVER CREEK

081263404, Dallas, IA

Built 1890 ADT: 21

COUNTY ROAD

Poor

Over: FROG CREEK

081281608, Dallas, IA

Built 1937 ADT: 35

LOCAL

Poor

Over: TRIB FOX RIVER

068120901, Davis, IA

Built 1959 ADT: 50

LOCAL

Poor

Over: S CHEQUEST LAKE CREEK

069121212, Davis, IA

Built 1963 ADT: 26

LOCAL

Poor

Over: LICK BRANCH OF WELDON R

067240501, Decatur, IA

Built 1958 ADT: 26

FM

Poor

Over: STREAM

067261004, Decatur, IA

Built 1971 ADT: 79

LOCAL

Poor

Over: DICKENSON BRANCH

067261202, Decatur, IA

Built 1949 ADT: 62

LOCAL

Poor

Over: LITTLE RIVER

068251904, Decatur, IA

Built 1943 ADT: 72

LOCAL

Poor

Over: ELK CREEK

068260703, Decatur, IA

Built 1921 ADT: 15

FM

Poor

Over: STREAM

068261603, Decatur, IA

Built 1968 ADT: 20

LOCAL

Poor

Over: W FORK BIG CREEK

068271901, Decatur, IA

Built 1929 ADT: 15

FM

Poor

Over: JONATHAN CREEK

069250103, Decatur, IA

Built 1920 ADT: 29

LOCAL

Poor

Over: CREEK

069263007, Decatur, IA

Built 1958 ADT: 11

LOCAL

Poor

Over: WELDON CREEK

070240706, Decatur, IA

Built 1916 ADT: 26

FM

Poor

Over: BEE CREEK

070260905, Decatur, IA

Built 1957 ADT: 29

LOCAL RD

Poor

Over: WOLF CREEK

070261104, Decatur, IA

Built 1978 ADT: 35

FM

Poor

Over: STREAM

070262804, Decatur, IA

Built 1962 ADT: 79

LOCAL

Poor

Over: STREAM

070270903, Decatur, IA

Built 1967 ADT: 11

HAWKEYE RD

Poor

Over: HAWKEYE CREEK

0720214, Des Moines, IA

Built 1910 ADT: 11

EXP. DISP. AREA RD

Poor

Over: SPRING CREEK

APPROX 5000' E. OF RD. H, Des Moines, IA

Built 1940 ADT: 5

LOCAL

Poor

Over: STONY CREEK

098381602, Dickinson, IA

Built 1946 ADT: 11

LOCAL

Poor

Over: LITTLE SIOUX

099372001, Dickinson, IA

Built 1920 ADT: 31

LOCAL

Poor

Over: GRANGER CREEK

088E30611, Dubuque, IA

Built 1925 ADT: 45

LOCAL

Poor

Over: JOHN'S CREEK

088023502, Dubuque, IA

Built 1938 ADT: 26

ENTRANCE

Poor

Over: SIDE DITCH BRIDGE

087021601, Dubuque, IA

Built 1912 ADT: 10

473RD AVE

Poor

Over: JACK CREEK

099322904, Emmet, IA

Built 1906 ADT: 11

LOCAL

Poor

Over: E FORK OF DES MOINES

100322404, Emmet, IA

Built 1895 ADT: 5

ROSE RD.

Poor

Over: OTTER CR

091091803, Fayette, IA

Built 1956 ADT: 15

LOCAL

Poor

Over: LITTLE CEDAR

096150503, Floyd, IA

Built 1900 ADT: 26

LOCAL

Poor

Over: LITTLE CEDAR OVERFLOW

096150503, Floyd, IA

Built 1939 ADT: 26

LOCAL OLIVE AVE

Poor

Over: DRAINAGE DITCH NO 13

090202802, Franklin, IA

Built 1950 ADT: 21

INDIGO AVE

Poor

Over: DRAINAGE DITCH NO 6

090210902, Franklin, IA

Built 1957 ADT: 11

WRIGHT AVE

Poor

Over: DRAINAGE DITCH

090223102, Franklin, IA

Built 1967 ADT: 21

175TH STREET

Poor

Over: SMALL STREAM

092201303, Franklin, IA

Built 1968 ADT: 35

310 AVENUE

Poor

Over: BRUSH CREEK

070412004, Fremont, IA

Built 1900 ADT: 41

LOCAL ROAD

Poor

Over: DOWD CREEK

086181601, Grundy, IA

Built 1977 ADT: 15

LOCAL

Poor

Over: BRANCH BLACKHAWK CREEK

087170303, Grundy, IA

Built 1955 ADT: 33

Showing 16,701-16,750 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.