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

I-80

Fair

Over: STREAM

2.7 MI. W OF JCT. US 67, Scott, IA

Built 1963 Load: 32.7 t ADT: 33,700

112TH ST

Fair

Over: CREEK

077E21703, Scott, IA

Built 1964 Load: 32.7 t ADT: 1,070

ST ANNES RD

Fair

Over: CREEK

080E31903, Scott, IA

Built 1989 Load: 32.7 t ADT: 510

220TH AVE

Fair

Over: JONES CREEK

080E42708, Scott, IA

Built 1986 Load: 32.7 t ADT: 210

CROW CREEK RD

Fair

Over: EAST PIGEON CREEK

Bettendorf, IA, Scott, IA

Built 1982 Load: 32.7 t ADT: 3,030

ELMORE AVE

Fair

Over: PHEASANT CREEK

000000000, Scott, IA

Built 2002 Load: 32.7 t ADT: 6,100

CROW CREEK RD

Fair

Over: GINGER CREEK

Bettendorf, IA, Scott, IA

Built 1996 Load: 32.7 t ADT: 3,221

LOCAL

Fair

Over: SMALL STREAM

078392904, Shelby, IA

Built 1950 Load: 32.7 t ADT: 72

FM

Fair

Over: DRY CREEK

095470401, Sioux, IA

Built 1964 Load: 32.7 t ADT: 419

FM

Fair

Over: NO NAME CREEK

097463002, Sioux, IA

Built 1964 Load: 32.7 t ADT: 369

6TH ST

Fair

Over: WEST INDIAN CREEK

000000000, Story, IA

Built 1964 Load: 32.7 t ADT: 1,850

I-35

Fair

Over: BALLARD CREEK

1.9 MILES N OF JCT IA 210, Story, IA

Built 1964 Load: 32.7 t ADT: 46,600

I-35

Fair

Over: WALNUT CREEK

4.2 MILES N OF JCT IA 210, Story, IA

Built 1964 Load: 32.7 t ADT: 46,600

E66

Fair

Over: DRAINAGE DITCH

083143603, Tama, IA

Built 1976 Load: 32.7 t ADT: 1,031

FM

Fair

Over: BRANCH OF RICHLAND CREEK

082142004, Tama, IA

Built 1994 Load: 32.7 t ADT: 265

IRR FM

Fair

Over: BRANCH OF RICHLAND CREEK

082153101, Tama, IA

Built 2002 Load: 32.7 t ADT: 304

M AVE

Fair

Over: BRANCH IOWA RIVER

083143102, Tama, IA

Built 1983 Load: 32.7 t ADT: 5

FM

Fair

Over: BRANCH INDIAN CREEK

083162901, Tama, IA

Built 1984 Load: 32.7 t ADT: 334

LOCAL

Fair

Over: DEER CREEK

084153104, Tama, IA

Built 1994 Load: 32.7 t ADT: 26

FM

Fair

Over: BRANCH IOWA RIVER

084161801, Tama, IA

Built 1982 Load: 32.7 t ADT: 962

LOCAL

Fair

Over: BRANCH DEER CREEK

084162201, Tama, IA

Built 1983 Load: 32.7 t ADT: 59

LOCAL

Fair

Over: SMALL STREAM

085131002, Tama, IA

Built 1987 Load: 32.7 t ADT: 11

LOCAL

Fair

Over: SMALL STREAM

085132301, Tama, IA

Built 1986 Load: 32.7 t ADT: 255

LOCAL

Fair

Over: SALT CREEK

085142702, Tama, IA

Built 2009 Load: 32.7 t ADT: 20

LOCAL

Fair

Over: DRAINAGE

086161101, Tama, IA

Built 1990 Load: 32.7 t ADT: 11

LOCAL

Fair

Over: DRAINAGE

086161102, Tama, IA

Built 1990 Load: 32.7 t ADT: 39

LOCAL

Fair

Over: SMALL

086143001, Tama, IA

Built 1994 Load: 32.7 t ADT: 15

FM

Fair

Over: OTTER CREEK

083140604, Tama, IA

Built 1983 Load: 32.7 t ADT: 128

IRR FM

Fair

Over: SMALL

082150504, Tama, IA

Built 1989 Load: 32.7 t ADT: 98

IA 2

Fair

Over: MIDDLE 102 RIVER

2.9 mi. W of Jct. IA 148, Taylor, IA

Built 1977 Load: 32.7 t ADT: 1,350

IA 148

Fair

Over: MIDDLE BRANCH W 102 RVR

2.8 MI. S OF SR J-20, Taylor, IA

Built 1924 Load: 32.7 t ADT: 890

FM

Fair

Over: SMALL STREAM

067323008, Taylor, IA

Built 1989 Load: 32.7 t ADT: 40

LOCAL

Fair

Over: TRIB TO WEST 102 RIVER

067352104, Taylor, IA

Built 1984 Load: 32.7 t ADT: 29

150TH ST

Fair

Over: EAST FORK 102 RIVER

070323101, Taylor, IA

Built 2021 Load: 32.7 t ADT: 50

LOCAL

Fair

Over: NODAWAY RIVER DITCH

070350401, Taylor, IA

Built 1989 Load: 32.7 t ADT: 29

LOCAL ROAD

Fair

Over: SMALL STREAM

071280404, Union, IA

Built 1978 Load: 32.7 t ADT: 15

FM

Fair

Over: SMALL STREAM

071310504, Union, IA

Built 1974 Load: 32.7 t ADT: 131

FM

Fair

Over: THREE MILE CREEK

072290404, Union, IA

Built 1969 Load: 32.7 t ADT: 450

FM

Fair

Over: CREEK

072303202, Union, IA

Built 1994 Load: 32.7 t ADT: 319

LOCAL

Fair

Over: SMALL STREAM

073311805, Union, IA

Built 1990 Load: 32.7 t ADT: 11

LOCAL

Fair

Over: STREAM

067090503, Van Buren, IA

Built 1972 Load: 32.7 t ADT: 30

FM

Fair

Over: CREEK

068080201, Van Buren, IA

Built 1936 Load: 32.7 t ADT: 530

LOCAL

Fair

Over: CREEK

068091602, Van Buren, IA

Built 1970 Load: 32.7 t ADT: 47

FM

Fair

Over: CREEK

069102722, Van Buren, IA

Built 1968 Load: 32.7 t ADT: 770

LAC-KEO ST PARK

Fair

Over: STREAM

2.6 mi. S of Iowa 1, Van Buren, IA

Built 1920 Load: 32.7 t

EDDYVILLE RD

Fair

Over: SMALL STREAM

072140405, Wapello, IA

Built 1987 Load: 32.7 t ADT: 2,600

LOCAL

Fair

Over: CHIPPEWA CREEK

071121706, Wapello, IA

Built 1978 Load: 32.7 t ADT: 30

LOCAL

Fair

Over: UNNAMED CREEK

071131605, Wapello, IA

Built 2000 Load: 32.7 t ADT: 145

LOCAL

Fair

Over: WOLF CREEK

073120703, Wapello, IA

Built 1991 Load: 32.7 t ADT: 21

FM

Fair

Over: COMPETINE CREEK

073121103, Wapello, IA

Built 1981 Load: 32.7 t ADT: 21

Showing 6,951-7,000 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.