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

FM

Poor

Over: PINE CREEK

077E11710, Muscatine, IA

Built 1955 Load: 15.7 t ADT: 60

190TH STREET

Poor

Over: WEST TARKIO CREEK

069382001, Page, IA

Built 1958 Load: 15.7 t ADT: 71

LOCAL

Poor

Over: LITTLE CEDAR CREEK

091341801, Pocahontas, IA

Built 1964 Load: 15.7 t ADT: 30

LOCAL

Poor

Over: DRAINAGE

074381206, Pottawattamie, IA

Built 1952 Load: 15.7 t ADT: 29

LOCAL

Poor

Over: SMALL STREAM

081131202, Poweshiek, IA

Built 1950 Load: 15.7 t ADT: 34

FM

Poor

Over: PLATTE RIVER

070310601, Ringgold, IA

Built 1955 Load: 15.7 t ADT: 79

LOCAL RD

Poor

Over: OTTER CREEK

086382901, Sac, IA

Built 1968 Load: 15.7 t ADT: 45

FM

Poor

Over: SMALL STREAM

067332102, Taylor, IA

Built 1951 Load: 15.7 t ADT: 40

LOCAL ROAD

Poor

Over: LIME STONE CREEK

074252904, Warren, IA

Built 1965 Load: 15.7 t ADT: 20

FM

Poor

Over: GARRETSON DITCH

087460501, Woodbury, IA

Built 1955 Load: 15.7 t ADT: 71

EMMETT AVE

Poor

Over: OTTER CREEK

092261102, Wright, IA

Built 1969 Load: 15.7 t ADT: 11

LOCAL - 100TH

Poor

Over: CREEK

077370601, Cass, IA

Built 1900 Load: 15.8 t ADT: 11

LOCAL

Poor

Over: SPRING BRANCH CREEK

094132101, Chickasaw, IA

Built 1972 Load: 15.8 t ADT: 21

S 120TH AVE E

Poor

Over: SMALL STREAM

078183401, Jasper, IA

Built 1980 Load: 15.8 t ADT: 11

FM

Poor

Over: OVER UP RR

076150703, Mahaska, IA

Built 1961 Load: 15.8 t ADT: 370

LOCAL

Poor

Over: DRAINAGE

071181008, Monroe, IA

Built 1965 Load: 15.8 t ADT: 20

SYCAMORE AVE

Poor

Over: STREAM

070360504, Page, IA

Built 1961 Load: 15.8 t ADT: 45

260TH ST

Poor

Over: DRY BRANCH

091442801, Plymouth, IA

Built 1956 Load: 15.8 t ADT: 34

LOCAL

Poor

Over: STREAM

067301204, Ringgold, IA

Built 1993 Load: 15.8 t ADT: 15

LOCAL

Poor

Over: CHARITON RIVER

069220501, Wayne, IA

Built 1983 Load: 15.8 t ADT: 20

LOCAL

Poor

Over: BRUSH CREEK

070210601, Wayne, IA

Built 1993 Load: 15.8 t ADT: 40

LOCAL

Poor

Over: DD

088291501, Webster, IA

Built 1960 Load: 15.8 t ADT: 15

LOCAL

Poor

Over: BR STEIN CK

084121602, Benton, IA

Built 1969 Load: 15.9 t ADT: 34

FM

Poor

Over: CREEK

092363402, Buena Vista, IA

Built 1964 Load: 15.9 t ADT: 339

LOCAL/ROCKPORT

Poor

Over: WATERWAY

075343203, Cass, IA

Built 1900 Load: 15.9 t ADT: 89

KING AVE

Poor

Over: ROCK CR

080032308, Cedar, IA

Built 1946 Load: 15.9 t ADT: 50

FM

Poor

Over: SMALL STREAM

070152511, Davis, IA

Built 1940 Load: 15.9 t ADT: 70

FM

Poor

Over: WELDON RIVER

069240903, Decatur, IA

Built 1957 Load: 15.9 t ADT: 15

FM

Poor

Over: BIG HOLLOW CREEK

071033002, Des Moines, IA

Built 1956 Load: 15.9 t ADT: 90

FM

Poor

Over: CREEK

090021404, Dubuque, IA

Built 1959 Load: 15.9 t ADT: 170

300TH ST

Poor

Over: NUTTING CR

095080207, Fayette, IA

Built 1917 Load: 15.9 t ADT: 20

HAMLET RD.

Poor

Over: NUTTING CR

095080205, Fayette, IA

Built 1917 Load: 15.9 t ADT: 59

LOCAL GROVE AVE

Poor

Over: BRANCH CRANE CREEK

099133004, Howard, IA

Built 1983 Load: 15.9 t ADT: 31

LOCAL

Poor

Over: BRANCH OLD MAN'S CREEK

079110102, Iowa, IA

Built 1925 Load: 15.9 t ADT: 71

LOCAL

Poor

Over: TETE DE MORTS CREEK

087E31606, Jackson, IA

Built 1984 Load: 15.9 t ADT: 20

W 80TH ST S

Poor

Over: SEVERS CREEK

079200410, Jasper, IA

Built 1951 Load: 15.9 t ADT: 123

LOCAL

Poor

Over: ROCK CREEK

081171702, Jasper, IA

Built 1954 Load: 15.9 t ADT: 26

LOCAL

Poor

Over: STREAM

071090103, Jefferson, IA

Built 1953 Load: 15.9 t ADT: 45

FM

Poor

Over: DRAINAGE

072080301, Jefferson, IA

Built 1954 Load: 15.9 t ADT: 50

LOCAL

Poor

Over: BR OF WHITEBREAST CREEK

072222906, Lucas, IA

Built 1951 Load: 15.9 t ADT: 47

LOCAL

Poor

Over: N COAL CREEK

074170204, Mahaska, IA

Built 1955 Load: 15.9 t ADT: 11

LOCAL

Poor

Over: DRAINAGE

075142208, Mahaska, IA

Built 1957 Load: 15.9 t ADT: 30

LOCAL

Poor

Over: SPRING CREEK

075150807, Mahaska, IA

Built 1965 Load: 15.9 t ADT: 120

LOCAL

Poor

Over: ST JOSEPH CREEK

075172507, Mahaska, IA

Built 1959 Load: 15.9 t ADT: 71

FM

Poor

Over: BUCKLEY CREEK

077172707, Mahaska, IA

Built 1956 Load: 15.9 t ADT: 140

LOCAL

Poor

Over: BR WOLF CREEK

085170401, Marshall, IA

Built 1953 Load: 15.9 t ADT: 33

LOCAL

Poor

Over: BR RAVEN CREEK

082171304, Marshall, IA

Built 1986 Load: 15.9 t ADT: 26

FM

Poor

Over: W NODAWAY

071362103, Montgomery, IA

Built 1939 Load: 15.9 t ADT: 300

LOCAL RD

Poor

Over: BRANCH TARKIO CREEK

073372604, Montgomery, IA

Built 1959 Load: 15.9 t ADT: 15

LOCAL

Poor

Over: CRYSTAL CREEK

084160102, Tama, IA

Built 1951 Load: 15.9 t ADT: 49

Showing 18,451-18,500 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.