State profile · Above national median SD

Iowa bridge safety

Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in Iowa — drawn straight from the FHWA National Bridge Inventory.

20,753
Public bridges
36.5%
Good condition
20.0%
Poor condition
20.0%
Structurally deficient

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 rated 0-4

Structurally Deficient

20.0%

4,153 bridges flagged for repair priority

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 — Structurally deficient share 66.7%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.

Condition Distribution

Bridge inventory deck-condition mix — Iowa (FHWA NBI)

Iowa36.534476943092564%38.39444899532597%20.011564593070883%20.011564593070883%GoodFairPoorStructurally Deficient
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 on the structurally deficient leaderboard (lower share = better)

States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below Iowa on the same metric.

54

West Virginia

16.02% top marginal rate
Structure
Progressive
Burden @ $100K
$7,679

46

South Dakota

16.24% top marginal rate
Structure
Progressive
Burden @ $100K
$5,905
Selected

19

Iowa

20.01% top marginal rate
Structure
Progressive
Burden @ $100K
$20,753

78

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 composite NBI rating. Each is inspected at least every 24 months.

270TH STREET

Structurally Deficient

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

Structurally Deficient

Over: MUD CREEK

87-12-15-02-10, Black Hawk, IA

Built 1948 Load: 2.7 t ADT: 11

LOCAL - 700TH

Structurally Deficient

Over: TRIB TROUBLESOME CREEK

077351402, Cass, IA

Built 1983 Load: 2.7 t ADT: 11

LOCAL - DAYTONA

Structurally Deficient

Over: BUCK CREEK

077361903, Cass, IA

Built 1980 Load: 2.7 t ADT: 35

100TH ST.

Structurally Deficient

Over: UNION CREEK

083E20101, Clinton, IA

Built 1900 Load: 2.7 t ADT: 78

All Bridges in Iowa

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

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

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: EAST WAPSIPINICON

094110702, Chickasaw, IA

Built 1900 Load: 17.7 t ADT: 98

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

LOCAL

Poor

Over: DRAINAGE DITCH NO. 3

090303401, Webster, IA

Built 1913 Load: 17.7 t ADT: 30

LOCAL

Poor

Over: SQUAW CREEK

085252501, Boone, IA

Built 1900 Load: 17.8 t ADT: 15

PINE CREEK AVE

Poor

Over: SMALL STREAM

089081502, Buchanan, IA

Built 2012 Load: 17.8 t ADT: 30

LOCAL - 540TH

Poor

Over: LONE TREE BRANCH

074371902, Cass, IA

Built 1987 Load: 17.8 t ADT: 50

LOCAL - PELLA

Poor

Over: FOX CREEK

075362103, Cass, IA

Built 1987 Load: 17.8 t ADT: 21

LOCAL - 640TH

Poor

Over: LONE TREE BRANCH

076363504, Cass, IA

Built 1987 Load: 17.8 t ADT: 11

LOCAL

Poor

Over: EAST WAPSIPINICON RIVER

096132303, Chickasaw, IA

Built 1963 Load: 17.8 t ADT: 51

LOCAL

Poor

Over: EAST LONG CREEK

071270103, Clarke, IA

Built 1900 Load: 17.8 t ADT: 5

LOCAL

Poor

Over: CARTERS CREEK

068151502, Davis, IA

Built 1958 Load: 17.8 t ADT: 5

IA 9

Poor

Over: W FORK LITTLE SIOUX RVR

4.9 mi. W of IA 86, Dickinson, IA

Built 1929 Load: 17.8 t ADT: 4,310

18TH ST.

Poor

Over: UNNAMED CREEK

091093405, Fayette, IA

Built 1962 Load: 17.8 t ADT: 69

LOCAL

Poor

Over: SEELEY CREEK

079320302, Guthrie, IA

Built 1968 Load: 17.8 t ADT: 199

FM

Poor

Over: BOONE RIVER

089251701, Hamilton, IA

Built 1955 Load: 17.8 t ADT: 60

LOCAL

Poor

Over: SNIPE CREEK

082191502, Marshall, IA

Built 1950 Load: 17.8 t ADT: 16

LOCAL

Poor

Over: CREEK

083171003, Marshall, IA

Built 1953 Load: 17.8 t ADT: 104

LOCAL

Poor

Over: MINERVA CR

084201702, Marshall, IA

Built 1950 Load: 17.8 t ADT: 26

QUEST AVE

Poor

Over: RATHBURN CREEK

091431902, Plymouth, IA

Built 1950 Load: 17.8 t ADT: 26

FM

Poor

Over: NORTH SKUNK RIVER

078162704, Poweshiek, IA

Built 1958 Load: 17.8 t ADT: 70

LOCAL

Poor

Over: STREAM

069280101, Ringgold, IA

Built 1993 Load: 17.8 t ADT: 29

LOCAL RD

Poor

Over: STREAM

071293002, Union, IA

Built 1973 Load: 17.8 t ADT: 5

Showing 17,701-17,750 of 20,753 bridges

Related

All states → | National rankings → | Understanding conditions → | SD bridges explained →
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges Editorial.

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). A "structurally deficient" rating is a repair-priority signal, not a closure or unsafe-to-cross designation. Consult a qualified civil engineer before making decisions based on this data.

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.