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

CO RD W64

Good

Over: ENGLISH RIVER

077061502, Washington, IA

Built 2006 Load: 32.7 t ADT: 1,230

W38 GINKO AVE

Good

Over: DRAINAGE DITCH

076080702, Washington, IA

Built 2010 Load: 32.7 t ADT: 770

YUCCA AVE

Good

Over: BUFF CREEK

074061105, Washington, IA

Built 1995 Load: 32.7 t ADT: 20

LOCAL ROAD

Good

Over: SMALL CREEK

074061903, Washington, IA

Built 1990 Load: 32.7 t ADT: 30

LOCAL ROAD

Good

Over: SMALL STREAM

074071603, Washington, IA

Built 2004 Load: 32.7 t ADT: 11

FM

Good

Over: S. FORK LONG CREEK

075061904, Washington, IA

Built 1992 Load: 32.7 t ADT: 590

LOCAL ROAD

Good

Over: BUFF CREEK

075063208, Washington, IA

Built 1997 Load: 32.7 t ADT: 40

FM

Good

Over: N.FORK LONG CREEK

075070301, Washington, IA

Built 1985 Load: 32.7 t ADT: 3,370

FM

Good

Over: S. FORK LONG CREEK

075070404, Washington, IA

Built 1996 Load: 32.7 t ADT: 3,520

FM

Good

Over: DUTCH CREEK

075090604, Washington, IA

Built 1997 Load: 32.7 t ADT: 72

FM

Good

Over: DUTCH CREEK

075093006, Washington, IA

Built 1997 Load: 32.7 t ADT: 45

LOCAL

Good

Over: NORTH FORK LONG CREEK

076071804, Washington, IA

Built 1995 Load: 32.7 t ADT: 40

FM

Good

Over: W FORK CROOKED CR

076091904, Washington, IA

Built 1998 Load: 32.7 t ADT: 750

FM

Good

Over: SMALL STREAM

076092101, Washington, IA

Built 2009 Load: 32.7 t ADT: 640

LOCAL ROAD

Good

Over: SMALL STREAM

077062203, Washington, IA

Built 2007 Load: 32.7 t ADT: 80

POPLAR BLVD

Good

Over: SMALL STREAM

077070308, Washington, IA

Built 2006 Load: 32.7 t ADT: 100

LOCAL ROAD

Good

Over: SMALL STREAM

077071705, Washington, IA

Built 2001 Load: 32.7 t ADT: 11

110TH ST

Good

Over: SMALL STREAM

077081201, Washington, IA

Built 2006 Load: 32.7 t ADT: 100

ELM AVE

Good

Over: CREEK

074092306, Washington, IA

Built 2005 Load: 32.7 t ADT: 120

2ND ST

Good

Over: FLINT CREEK

077092400, Washington, IA

Built 2008 Load: 32.7 t ADT: 389

US 218

Good

Over: BIG SLOUGH CREEK

3.8 MI. S OF JCT. IA 92, Washington, IA

Built 1997 Load: 32.7 t ADT: 12,400

FM

Good

Over: FORK CALEB CREEK

067230608, Wayne, IA

Built 2004 Load: 32.7 t ADT: 40

FM

Good

Over: GRAND RIVER

067232203, Wayne, IA

Built 1998 Load: 32.7 t ADT: 80

LOCAL

Good

Over: STREAM

068202501, Wayne, IA

Built 1991 Load: 32.7 t ADT: 30

FM

Good

Over: LOCUST CREEK

068202906, Wayne, IA

Built 2000 Load: 32.7 t ADT: 70

FILLMORE ROAD

Good

Over: LOCUST CREEK

068203303, Wayne, IA

Built 2022 Load: 32.7 t ADT: 30

FM

Good

Over: STREAM

068212303, Wayne, IA

Built 2002 Load: 32.7 t ADT: 480

LOCAL

Good

Over: MEDICINE CR

068212901, Wayne, IA

Built 1985 Load: 32.7 t ADT: 20

S 34 (140TH)

Good

Over: STREAM

068212902, Wayne, IA

Built 2011 Load: 32.7 t ADT: 60

FM

Good

Over: STREAM

068231304, Wayne, IA

Built 2007 Load: 32.7 t ADT: 40

LOCAL

Good

Over: WALNUT CREEK

069203302, Wayne, IA

Built 1986 Load: 32.7 t ADT: 15

LOCAL

Good

Over: STREAM

069222503, Wayne, IA

Built 2000 Load: 32.7 t ADT: 60

LOCAL

Good

Over: SOUTH CHARITON RIVER

069223301, Wayne, IA

Built 1989 Load: 32.7 t ADT: 26

25TH ST

Good

Over: STREAM

070232004, Wayne, IA

Built 2020 Load: 32.7 t ADT: 11

45TH ST

Good

Over: TRIB TO TURKEY CREEK

068232708, Wayne, IA

Built 2019 Load: 32.7 t ADT: 30

150TH ST

Good

Over: TRIB TO W JACKSON CREEK

069212102, Wayne, IA

Built 2019 Load: 32.7 t ADT: 34

DAVIS RD

Good

Over: TRIB TO MEDICINE CREEK

067220701, Wayne, IA

Built 2019 Load: 32.7 t ADT: 26

245TH ST

Good

Over: COOPER CREEK

068200104, Wayne, IA

Built 2020 Load: 32.7 t ADT: 50

JOHNSON AVE

Good

Over: BUTTRICK CREEK

086292202, Webster, IA

Built 2009 Load: 32.7 t ADT: 46

340TH ST

Good

Over: BUTTRICK CREEK

086300201, Webster, IA

Built 2021 Load: 32.7 t ADT: 41

LOCAL

Good

Over: CROOKED CREEK

087281003, Webster, IA

Built 2009 Load: 32.7 t ADT: 30

FM

Good

Over: DD #5

087301302, Webster, IA

Built 1995 Load: 32.7 t ADT: 1,277

FM

Good

Over: PRAIRIE CREEK

088282902, Webster, IA

Built 2009 Load: 32.7 t ADT: 880

240TH ST

Good

Over: DD

088301401, Webster, IA

Built 2013 Load: 32.7 t ADT: 70

FM

Good

Over: NORTH LIZARD CREEK

089291702, Webster, IA

Built 1995 Load: 32.7 t ADT: 60

LOCAL

Good

Over: DEER CREEK

090292103, Webster, IA

Built 1996 Load: 32.7 t ADT: 35

FM

Good

Over: NORTH LIZARD CREEK

090303202, Webster, IA

Built 1998 Load: 32.7 t ADT: 30

PARK ENTRANCE

Good

Over: DRAINAGE

086281401, Webster, IA

Built 2011 Load: 32.7 t ADT: 257

LOCAL

Good

Over: BRUSHY CREEK SPILLWAY

088273403, Webster, IA

Built 1998 Load: 32.7 t ADT: 159

FM

Good

Over: TWISTER BRANCH

098242701, Winnebago, IA

Built 2011 Load: 32.7 t ADT: 45

Showing 12,201-12,250 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.