State profile · Above median Poor share

Iowa bridge safety

Condition ratings, load ratings, and Poor-condition data for every public highway bridge in Iowa, based on the FHWA National Bridge Inventory.

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

Data updated May 2026

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 whose lowest applicable component is rated 0-4

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 - Poor-condition share 66.7%
National avg

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

Condition Distribution

Iowa38.5%40.4%21.1%GoodFairPoor
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 by Poor-condition share (lower share = better)

States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below Iowa on the same metric.

WV

West Virginia

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

SD

South Dakota

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

IA

Iowa

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

VI

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 the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.

270TH STREET

Poor

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

Poor

Over: MUD CREEK

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

Built 1948 Load: 2.7 t ADT: 11

LOCAL - 700TH

Poor

Over: TRIB TROUBLESOME CREEK

077351402, Cass, IA

Built 1983 Load: 2.7 t ADT: 11

LOCAL - DAYTONA

Poor

Over: BUCK CREEK

077361903, Cass, IA

Built 1980 Load: 2.7 t ADT: 35

100TH ST.

Poor

Over: UNION CREEK

083E20101, Clinton, IA

Built 1900 Load: 2.7 t ADT: 78

All Bridges in Iowa

LOCAL

Fair

Over: SILVER CREEK

095331802, Palo Alto, IA

Built 1981 Load: 31.8 t ADT: 30

LOCAL

Fair

Over: SOUTH LIZARD CREEK DD#22

090320902, Pocahontas, IA

Built 1982 Load: 31.8 t ADT: 20

FM

Fair

Over: LIZARD CREEK

091313202, Pocahontas, IA

Built 1985 Load: 31.8 t ADT: 589

LOCAL

Fair

Over: DD #181 BIG CEDAR CK

091331801, Pocahontas, IA

Built 1984 Load: 31.8 t ADT: 11

LOCAL

Fair

Over: PILOT CREEK

093323601, Pocahontas, IA

Built 1982 Load: 31.8 t ADT: 30

LOCAL

Fair

Over: BOYER RIVER

089370502, Sac, IA

Built 1981 Load: 31.8 t ADT: 15

FM

Fair

Over: TRIBUTARY TO MIDDLE 102

070332001, Taylor, IA

Built 1984 Load: 31.8 t ADT: 390

ELM ST

Fair

Over: PIERSON CREEK

089431204, Woodbury, IA

Built 1982 Load: 31.8 t ADT: 96

LOCAL

Fair

Over: MCELHANEY CREEK

089441302, Woodbury, IA

Built 1982 Load: 31.8 t ADT: 34

N PILOT GROVE RD

Fair

Over: POYNER CREEK

89-11-20-02-10, Black Hawk, IA

Built 1984 Load: 31.9 t ADT: 59

FM 210TH ST

Fair

Over: OTTER CREEK

093203103, Franklin, IA

Built 1974 Load: 31.9 t ADT: 137

LOCAL ROAD

Fair

Over: BRANCH BEAR CREEK

087183001, Grundy, IA

Built 1955 Load: 31.9 t ADT: 49

IA 92

Fair

Over: MONKEY RUN CREEK

0.6 mi. W of IA 70, Louisa, IA

Built 1984 Load: 31.9 t ADT: 2,790

IA 2

Fair

Over: EAST FORK GRAND RIVER

2.9 MI. E OF E JCT. US169, Ringgold, IA

Built 1985 Load: 31.9 t ADT: 1,750

LOCAL

Fair

Over: CREEK

079E22101, Scott, IA

Built 1998 Load: 31.9 t ADT: 11

IRR-FM

Fair

Over: IOWA RIVER OVERFLOW

083152909, Tama, IA

Built 1972 Load: 31.9 t ADT: 619

US 6 & IA 38

Fair

Over: OTTER CREEK

2.2 mi. S of Jct. I-80, Cedar, IA

Built 1959 Load: 32.0 t ADT: 3,450

LOCAL

Fair

Over: ELK CREEK

088192601, Hardin, IA

Built 1981 Load: 32.0 t ADT: 30

LOCAL 80TH ST

Fair

Over: DRAINAGE DITCH

099121403, Howard, IA

Built 1988 Load: 32.0 t ADT: 20

FM

Fair

Over: BRUSH CREEK

077201401, Marion, IA

Built 1968 Load: 32.0 t ADT: 120

LOCAL

Fair

Over: CREEK

076040104, Muscatine, IA

Built 1970 Load: 32.0 t ADT: 40

MCPHERSON AVE

Fair

Over: MOSQUITO CREEK

000000000, Pottawattamie, IA

Built 1993 Load: 32.0 t ADT: 3,786

LOCAL

Fair

Over: SMALL STREAM

072303401, Union, IA

Built 1988 Load: 32.0 t ADT: 15

FM

Fair

Over: UPPER IOWA RIVER

100100705, Winneshiek, IA

Built 1961 Load: 32.0 t ADT: 79

FM

Fair

Over: SMITH CREEK

088083506, Buchanan, IA

Built 2003 Load: 32.1 t ADT: 324

LOCAL

Fair

Over: STREAM

090E13505, Dubuque, IA

Built 1981 Load: 32.1 t ADT: 80

LAKE ELEANOR RD

Fair

Over: SMALL STREAM

00000, Dubuque, IA

Built 1980 Load: 32.1 t ADT: 480

I 35 SB OFF RAMP

Fair

Over: DRAINAGE DITCH

0.1 MILES NORTH OF JCT. 3, Franklin, IA

Built 1974 Load: 32.1 t ADT: 680

LOCAL

Fair

Over: STREAM

081311401, Guthrie, IA

Built 1961 Load: 32.1 t ADT: 40

LOCAL

Fair

Over: IOWA RIVER

089220104, Hardin, IA

Built 1978 Load: 32.1 t ADT: 88

FM

Fair

Over: TRIB S FK ENGLISH RIVER

077131201, Keokuk, IA

Built 2004 Load: 32.1 t ADT: 35

MT VERNON RD

Fair

Over: INDIAN CREEK

083062901, Linn, IA

Built 1969 Load: 32.1 t ADT: 7,169

SB I-380

Fair

Over: CC RR

2.6 MI. S OF JCT.100, Linn, IA

Built 1980 Load: 32.1 t ADT: 38,800

US 218

Fair

Over: SPRING CREEK

0.2 mi. S of S Jct. IA 9, Mitchell, IA

Built 1975 Load: 32.1 t ADT: 2,030

NB I-35,EB I-80

Fair

Over: DRAINAGE DITCH

0.8 MI. W OF JCT. IA 415, Polk, IA

Built 1958 Load: 32.1 t ADT: 48,000

PRAIRIE VIEW RD

Fair

Over: JORDON CREEK

000000000, Polk, IA

Built 1990 Load: 32.1 t ADT: 2,477

IRR-FM

Fair

Over: IOWA RIVER OVERFLOW

083152907, Tama, IA

Built 1972 Load: 32.1 t ADT: 619

FM

Fair

Over: COPPERS CREEK

069092207, Van Buren, IA

Built 1970 Load: 32.1 t ADT: 35

IA 22

Fair

Over: SMITH CREEK

3.6 mi. W of jct. IA 1, Washington, IA

Built 1990 Load: 32.1 t ADT: 3,330

LOCAL

Fair

Over: STREAM

067200903, Wayne, IA

Built 1991 Load: 32.1 t ADT: 11

LOCAL (LWC)

Fair

Over: STREAM

082123604, Benton, IA

Built 1977 Load: 32.2 t ADT: 45

LOCAL

Fair

Over: POWELL CREEK

091382401, Buena Vista, IA

Built 1972 Load: 32.2 t ADT: 40

FM

Fair

Over: DRAINAGE

090151102, Butler, IA

Built 1900 Load: 32.2 t ADT: 79

120 STREET

Fair

Over: WEST NISHNABOTNA RIVER

070411703, Fremont, IA

Built 1974 Load: 32.2 t ADT: 1,085

LOCAL

Fair

Over: DD

093302501, Humboldt, IA

Built 1900 Load: 32.2 t ADT: 15

FM

Fair

Over: STREAM

073111705, Jefferson, IA

Built 1956 Load: 32.2 t ADT: 260

SW 400TH ST

Fair

Over: OLD MANS CREEK

079082301, Johnson, IA

Built 1975 Load: 32.2 t ADT: 51

NW 160TH ST

Fair

Over: STREAM

081082401, Johnson, IA

Built 1993 Load: 32.2 t ADT: 20

FM CO.RT V67

Fair

Over: SMALL STREAM

075103004, Keokuk, IA

Built 1974 Load: 32.2 t ADT: 220

IA 5

Fair

Over: WALNUT CREEK

0.9 MILES NORTH OF SR G76, Marion, IA

Built 1925 Load: 32.2 t ADT: 3,570

Showing 6,151-6,200 of 20,753 bridges

Related

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

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). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.

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.

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.