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

230TH ST

Good

Over: CREEK

071110402, Jefferson, IA

Built 2019 Load: 32.7 t ADT: 30

560TH ST

Good

Over: BR DEER CREEK

078083401, Johnson, IA

Built 1999 Load: 32.7 t ADT: 70

SW 360TH ST

Good

Over: N BR OLD MANS CR

079080903, Johnson, IA

Built 1998 Load: 32.7 t ADT: 35

LOCAL

Good

Over: SMALL STREAM

077052101, Johnson, IA

Built 1999 Load: 32.7 t ADT: 60

MORMAN TREK BLV

Good

Over: WILLOW CREEK

079062100, Johnson, IA

Built 2005 Load: 32.7 t ADT: 5,200

OAKDALE BLVD

Good

Over: MUDDY CREEK

080063304, Johnson, IA

Built 2009 Load: 32.7 t ADT: 4,020

SWISHERVIEW DR.

Good

Over: SMALL STREAM

000000000, Johnson, IA

Built 1900 Load: 32.7 t ADT: 1,168

LIBERTY DRIVE

Good

Over: SNYDER CREEK

079051900, Johnson, IA

Built 1998 Load: 32.7 t ADT: 40

MORMON TRK BLVD

Good

Over: WILLOW CREEK

079061700, Johnson, IA

Built 2000 Load: 32.7 t ADT: 10,001

SCOTT BLVD

Good

Over: RALSTON CREEK N. BRANCH

079060100, Johnson, IA

Built 2003 Load: 32.7 t ADT: 4,858

RIVERSIDE DR

Good

Over: 218 RR AND RIVERSIDE DR

079062100, Johnson, IA

Built 2006 Load: 32.7 t ADT: 2,410

OAKDALE BLVD

Good

Over: MUDDY CREEK

000000000, Johnson, IA

Built 2012 Load: 32.7 t ADT: 4,020

NORTHGATE DR

Good

Over: TRIB. TO RAPID CREEK

080063600, Johnson, IA

Built 2003 Load: 32.7 t ADT: 66

US 218

Good

Over: DEER CREEK

0.9 mi. S of Jct. I-80, Johnson, IA

Built 1970 Load: 32.7 t ADT: 32,400

88TH AVE

Good

Over: MINERAL CREEK

085022604, Jones, IA

Built 1995 Load: 32.7 t ADT: 16

US 151

Good

Over: UNNAMED CREEK

2.0 mi. S of Jct. SR X44, Jones, IA

Built 2001 Load: 32.7 t ADT: 12,200

FM

Good

Over: RICHLAND CREEK

074102803, Keokuk, IA

Built 2007 Load: 32.7 t ADT: 200

290TH AVE

Good

Over: RICHLAND CREEK

074103202, Keokuk, IA

Built 1992 Load: 32.7 t ADT: 60

FM

Good

Over: CREEK

074111706, Keokuk, IA

Built 1990 Load: 32.7 t ADT: 35

FM

Good

Over: STREAM

075120705, Keokuk, IA

Built 2006 Load: 32.7 t ADT: 50

LOCAL ROAD

Good

Over: SOUTH FORK ENGLISH RIVER

077101802, Keokuk, IA

Built 2001 Load: 32.7 t ADT: 60

120TH STREET

Good

Over: TRIB S FORK ENGLISH RVR

077121801, Keokuk, IA

Built 2002 Load: 32.7 t ADT: 20

LOCAL

Good

Over: STREAM

077133301, Keokuk, IA

Built 2004 Load: 32.7 t ADT: 34

LOCAL

Good

Over: STREAM

077133301, Keokuk, IA

Built 2003 Load: 32.7 t ADT: 34

FM

Good

Over: NORTH SKUNK RIVER

075122104, Keokuk, IA

Built 1986 Load: 32.7 t ADT: 45

160TH ST

Good

Over: DRAINAGE DITCH 177

094270501, Kossuth, IA

Built 1999 Load: 32.7 t ADT: 5

B 63 130TH ST

Good

Over: DD 182

094281901, Kossuth, IA

Built 2019 Load: 32.7 t ADT: 46

LOC 240TH AVE

Good

Over: PRAIRIE CREEK

095272604, Kossuth, IA

Built 1996 Load: 32.7 t ADT: 143

LOC IRVINGTON R

Good

Over: PURCELL CREEK

095281904, Kossuth, IA

Built 2002 Load: 32.7 t ADT: 81

FM 210TH ST

Good

Over: FOUR MILE CREEK

095290803, Kossuth, IA

Built 2003 Load: 32.7 t ADT: 1,287

LOC 270TH AVE

Good

Over: PLUM CREEK

096271201, Kossuth, IA

Built 2001 Load: 32.7 t ADT: 15

FM 240TH AVE

Good

Over: PLUM CREEK

096271202, Kossuth, IA

Built 2002 Load: 32.7 t ADT: 638

260TH ST

Good

Over: LOTTS CREEK

096301601, Kossuth, IA

Built 2012 Load: 32.7 t ADT: 15

40TH AVE

Good

Over: LOTTS CREEK

096302702, Kossuth, IA

Built 2005 Load: 32.7 t ADT: 30

B 14 330TH ST

Good

Over: BUFFALO CREEK

097271201, Kossuth, IA

Built 2022 Load: 32.7 t ADT: 509

LOC 130TH AVE

Good

Over: DD #63

097281802, Kossuth, IA

Built 2003 Load: 32.7 t ADT: 267

LOC 115TH AVE

Good

Over: DD #69

097290204, Kossuth, IA

Built 2005 Load: 32.7 t ADT: 11

B19 310TH ST

Good

Over: CALAMUS CREEK

097292001, Kossuth, IA

Built 2020 Load: 32.7 t ADT: 679

LOCAL 350TH ST

Good

Over: LITTLE BUFFALO CREEK

098273401, Kossuth, IA

Built 1995 Load: 32.7 t ADT: 15

FM 220TH AVE

Good

Over: DD #7

099271502, Kossuth, IA

Built 1998 Load: 32.7 t ADT: 159

FM 80TH AVE

Good

Over: MUD CREEK

099292904, Kossuth, IA

Built 2000 Load: 32.7 t ADT: 549

FM 500TH ST

Good

Over: DD #121

100301601, Kossuth, IA

Built 1998 Load: 32.7 t ADT: 330

LOC 30TH AVE

Good

Over: DD #121

100301602, Kossuth, IA

Built 2000 Load: 32.7 t ADT: 21

LOCAL RD

Good

Over: UNNAMED CREEK

096291103, Kossuth, IA

Built 2004 Load: 32.7 t ADT: 62

SB US 61

Good

Over: DEVIL'S CREEK

2.5 mi. S of jct. IA 2, Lee, IA

Built 2000 Load: 32.7 t ADT: 3,850

WIRTZ LANE

Good

Over: PRICES CREEK

065051004, Lee, IA

Built 2007 Load: 32.7 t ADT: 80

FM

Good

Over: HOG THIEF HOLLOW

065052803, Lee, IA

Built 1991 Load: 32.7 t ADT: 130

FM

Good

Over: CREEK

065060301, Lee, IA

Built 2003 Load: 32.7 t ADT: 170

LOCAL

Good

Over: LAMALEES CREEK

066053504, Lee, IA

Built 1996 Load: 32.7 t ADT: 150

FM

Good

Over: LAMALEES CREEK

066053610, Lee, IA

Built 1996 Load: 32.7 t ADT: 370

Showing 11,751-11,800 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.