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

175TH ST

Fair

Over: BR LITTLE WAPSIPIOICON

098143507, Howard, IA

Built 2003 Load: 32.7 t ADT: 11

LOCAL

Fair

Over: UPPER IOWA RIVER

100130806, Howard, IA

Built 1996 Load: 32.7 t ADT: 30

LOCAL-LWC 40TH

Fair

Over: BR STAFF CREEK

100142305, Howard, IA

Built 1988 Load: 32.7 t ADT: 73

130TH STREET

Fair

Over: CREEK

098110701, Howard, IA

Built 2002 Load: 32.7 t ADT: 69

LOCAL ROAD

Fair

Over: CREEK

086391702, Ida, IA

Built 1990 Load: 32.7 t ADT: 41

FM

Fair

Over: UNNAMED CREEK

086412002, Ida, IA

Built 1988 Load: 32.7 t ADT: 20

FM

Fair

Over: SMALL STREAM

087393402, Ida, IA

Built 2003 Load: 32.7 t ADT: 30

LOCAL

Fair

Over: ALDRICH CREEK

087412801, Ida, IA

Built 1997 Load: 32.7 t ADT: 30

FM

Fair

Over: ALDRICH CREEK

087413307, Ida, IA

Built 1987 Load: 32.7 t ADT: 429

FM

Fair

Over: SMALL STREAM

088393201, Ida, IA

Built 1985 Load: 32.7 t ADT: 60

FM

Fair

Over: SMALL STREAM

088393201, Ida, IA

Built 1985 Load: 32.7 t ADT: 60

LOCAL

Fair

Over: BRANCH BACON CREEK

088410801, Ida, IA

Built 2000 Load: 32.7 t ADT: 26

FM

Fair

Over: CREEK

088412301, Ida, IA

Built 1991 Load: 32.7 t ADT: 100

FM

Fair

Over: DRAINAGE DEER CREEK

078091002, Iowa, IA

Built 1976 Load: 32.7 t ADT: 120

FM

Fair

Over: MIDDLE ENGLISH RIVER

078112202, Iowa, IA

Built 1975 Load: 32.7 t ADT: 130

LOCAL

Fair

Over: MIDDLE FK ENGLISH RIVER

078121702, Iowa, IA

Built 1992 Load: 32.7 t ADT: 40

LOCAL

Fair

Over: STREAM

078122001, Iowa, IA

Built 1975 Load: 32.7 t ADT: 50

LOCAL

Fair

Over: MIDDLE ENGLISH RIVER

078122102, Iowa, IA

Built 1983 Load: 32.7 t ADT: 34

FM

Fair

Over: GRITTER CREEK

078123402, Iowa, IA

Built 1981 Load: 32.7 t ADT: 310

FM

Fair

Over: BR OLD MAN'S CREEK

079093004, Iowa, IA

Built 1977 Load: 32.7 t ADT: 15

LOCAL

Fair

Over: DRAINAGE DITCH

079102802, Iowa, IA

Built 1974 Load: 32.7 t ADT: 11

FM

Fair

Over: COON CREEK

081111202, Iowa, IA

Built 1986 Load: 32.7 t ADT: 1,230

LOCAL

Fair

Over: SMALL STREAM

081121906, Iowa, IA

Built 2001 Load: 32.7 t ADT: 26

LOCAL

Fair

Over: SMALL STREAM

079092202, Iowa, IA

Built 1991 Load: 32.7 t ADT: 15

INDUSTRIAL PARK

Fair

Over: GAILS CREEK

Industrial Park Dr., Iowa, IA

Built 1998 Load: 32.7 t ADT: 201

I-80

Fair

Over: NO NAME CREEK

2.4 mi. W of Jct. IA 149, Iowa, IA

Built 1963 Load: 32.7 t ADT: 30,800

FM

Fair

Over: CREEK

085E41006, Jackson, IA

Built 1971 Load: 32.7 t ADT: 500

FM

Fair

Over: OTTER CREEK

086E20201, Jackson, IA

Built 1993 Load: 32.7 t ADT: 370

FM

Fair

Over: CREEK

086E20305, Jackson, IA

Built 1993 Load: 32.7 t ADT: 370

FM

Fair

Over: CREEK

086E32103, Jackson, IA

Built 1991 Load: 32.7 t ADT: 570

FM

Fair

Over: FARMERS CREEK

087E33306, Jackson, IA

Built 1990 Load: 32.7 t ADT: 380

283RD ST

Fair

Over: CREEK

863E0710, Jackson, IA

Built 1910 Load: 32.7 t ADT: 39

I-80

Fair

Over: DRAINAGE DITCH

3.7 MI. W OF JCT. IA 224, Jasper, IA

Built 1961 Load: 32.7 t ADT: 30,000

HIGHWAY T-38 S

Fair

Over: SMALL STREAM

078171108, Jasper, IA

Built 1977 Load: 32.7 t ADT: 330

E 142ND ST S

Fair

Over: EAST BRANCH BUCKLEY CR

078173404, Jasper, IA

Built 1991 Load: 32.7 t ADT: 30

E 132ND ST S

Fair

Over: TURNER CREEK

079171002, Jasper, IA

Built 1991 Load: 32.7 t ADT: 62

HIGHWAY T-22 S

Fair

Over: SLATER CREEK

079181302, Jasper, IA

Built 2007 Load: 32.7 t ADT: 1,160

S 44TH AVE W

Fair

Over: SEWER CREEK

079191603, Jasper, IA

Built 1987 Load: 32.7 t ADT: 440

W 76TH ST S

Fair

Over: SMALL STREAM

079201502, Jasper, IA

Built 1994 Load: 32.7 t ADT: 50

LOCAL

Fair

Over: SMALL STREAM

080190904, Jasper, IA

Built 1972 Load: 32.7 t ADT: 91

FM

Fair

Over: SMALL STREAM

080200601, Jasper, IA

Built 1988 Load: 32.7 t ADT: 300

FM

Fair

Over: SMALL STREAM

080210403, Jasper, IA

Built 1975 Load: 32.7 t ADT: 80

FM

Fair

Over: ABPLANALP CREEK

081172804, Jasper, IA

Built 1987 Load: 32.7 t ADT: 40

FM

Fair

Over: DRAINAGE

071081108, Jefferson, IA

Built 1992 Load: 32.7 t ADT: 390

LOCAL

Fair

Over: BRANCH OF WOLF CREEK

071081201, Jefferson, IA

Built 1972 Load: 32.7 t ADT: 45

LOCAL

Fair

Over: BRANCH BRUSH CREEK

072090906, Jefferson, IA

Built 1986 Load: 32.7 t ADT: 15

LOCAL

Fair

Over: BRUSH CREEK

072091006, Jefferson, IA

Built 1986 Load: 32.7 t ADT: 60

LOCAL

Fair

Over: BR BIG BEAR CREEK

072103004, Jefferson, IA

Built 1987 Load: 32.7 t ADT: 20

FM

Fair

Over: STREAM

072111205, Jefferson, IA

Built 1973 Load: 32.7 t ADT: 810

LOCAL

Fair

Over: SOUTH WALNUT CREEK

073093204, Jefferson, IA

Built 1986 Load: 32.7 t ADT: 30

Showing 6,651-6,700 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.