Total Bridges
20,753
Public highway bridges in Iowa
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
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
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
SD
South Dakota
16.24% top marginal rate
IA
Iowa
20.01% top marginal rate
VI
Virgin Islands
29.17% top marginal rate
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
PoorOver: ROSE BRANCH
071343401, Adams, IA
Built 1976 Load: 2.7 t ADT: 79
LOCAL
PoorOver: CREEK
078342601, Audubon, IA
Built 1935 Load: 2.7 t ADT: 21
KLINE RD
PoorOver: MUD CREEK
87-12-15-02-10, Black Hawk, IA
Built 1948 Load: 2.7 t ADT: 11
LOCAL - 700TH
PoorOver: TRIB TROUBLESOME CREEK
077351402, Cass, IA
Built 1983 Load: 2.7 t ADT: 11
LOCAL - DAYTONA
PoorOver: BUCK CREEK
077361903, Cass, IA
Built 1980 Load: 2.7 t ADT: 35
100TH ST.
PoorOver: UNION CREEK
083E20101, Clinton, IA
Built 1900 Load: 2.7 t ADT: 78
All Bridges in Iowa
LOCAL
FairOver: SOUTH FORK IOWA RIVER
088212004, Hardin, IA
Built 1980 Load: 30.2 t ADT: 47
FM TOLEDO AVE
FairOver: MILL CREEK
081412206, Harrison, IA
Built 1977 Load: 30.2 t ADT: 139
LOCAL
FairOver: GRITTER CREEK
078123502, Iowa, IA
Built 1977 Load: 30.2 t ADT: 26
FM
FairOver: SMALL CREEK
084E11502, Jackson, IA
Built 1979 Load: 30.2 t ADT: 226
FM
FairOver: ROCK BRANCH CREEK
072080302, Jefferson, IA
Built 1974 Load: 30.2 t ADT: 360
LOC 150TH ST
FairOver: PRAIRIE CREEK
094270801, Kossuth, IA
Built 1972 Load: 30.2 t ADT: 30
FM 130TH ST
FairOver: PRAIRIE CREEK
094271901, Kossuth, IA
Built 1972 Load: 30.2 t ADT: 249
FM 190TH AVE
FairOver: PRAIRIE CREEK
094271902, Kossuth, IA
Built 1971 Load: 30.2 t ADT: 489
LOC 140TH ST
FairOver: LOTTS CREEK
094301601, Kossuth, IA
Built 1971 Load: 30.2 t ADT: 400
FM 250TH ST
FairOver: BLACK CAT CREEK
096292401, Kossuth, IA
Built 1979 Load: 30.2 t ADT: 210
IA 16
FairOver: LITTLE CEDAR CREEK
1.7 mi. E of Jct. SR W46, Lee, IA
Built 1966 Load: 30.2 t ADT: 830
FM
FairOver: INDIAN CREEK
075033103, Louisa, IA
Built 1977 Load: 30.2 t ADT: 80
LOCAL
FairOver: BURNETT CREEK
084170702, Marshall, IA
Built 1979 Load: 30.2 t ADT: 82
FM
FairOver: LINN CREEK
084193202, Marshall, IA
Built 1987 Load: 30.2 t ADT: 147
FM
FairOver: CREEK
071181605, Monroe, IA
Built 1975 Load: 30.2 t ADT: 50
FM
FairOver: BEE BR,TRIB TO CEDAR CR
072181001, Monroe, IA
Built 1983 Load: 30.2 t ADT: 80
FM
FairOver: TARKIO CREEK
072372801, Montgomery, IA
Built 1978 Load: 30.2 t ADT: 509
LOCAL
FairOver: MUD CREEK
078010104, Muscatine, IA
Built 1983 Load: 30.2 t ADT: 383
LOCAL
FairOver: STREAM
098393401, Osceola, IA
Built 1934 Load: 30.2 t ADT: 35
SB US 75
FairOver: DRY CREEK
3.4 mi. N of jct. SR C60, Plymouth, IA
Built 1948 Load: 30.2 t ADT: 7,000
FM K-49
FairOver: PLYMOUTH CR
091450302, Plymouth, IA
Built 1974 Load: 30.2 t ADT: 1,236
FM
FairOver: JOHN'S CREEK
092443601, Plymouth, IA
Built 1976 Load: 30.2 t ADT: 1,157
FM
FairOver: INDIAN CREEK
093481202, Plymouth, IA
Built 1971 Load: 30.2 t ADT: 219
LOCAL
FairOver: NO LIZARD CK DD #77
092321702, Pocahontas, IA
Built 1976 Load: 30.2 t ADT: 60
FM-440TH STREET
FairOver: GRAYBILL CREEK
075391604, Pottawattamie, IA
Built 1972 Load: 30.2 t ADT: 50
FM-DOGWOOD RD
FairOver: GRAYBILL CREEK
075393101, Pottawattamie, IA
Built 1982 Load: 30.2 t ADT: 71
ROSEWOOD ROAD
FairOver: STREAM
076380301, Pottawattamie, IA
Built 1942 Load: 30.2 t ADT: 5
JUNIPER ROAD
FairOver: GRAYBILL CREEK
076393401, Pottawattamie, IA
Built 1982 Load: 30.2 t ADT: 20
FM
FairOver: N ENGLISH RIVER
079141804, Poweshiek, IA
Built 1979 Load: 30.2 t ADT: 70
FM
FairOver: LOTTS CREEK
067291203, Ringgold, IA
Built 1973 Load: 30.2 t ADT: 270
650TH AVE
FairOver: EAST BR INDIAN CREEK
083223404, Story, IA
Built 1976 Load: 30.2 t ADT: 1,228
FM
FairOver: SUGAR CREEK
083160904, Tama, IA
Built 1984 Load: 30.2 t ADT: 157
IRR-FM
FairOver: RAVEN CREEK
083162605, Tama, IA
Built 1981 Load: 30.2 t ADT: 432
FM
FairOver: HONEY CREEK
068332104, Taylor, IA
Built 1976 Load: 30.2 t ADT: 29
LOCAL
FairOver: PLATTE RIVER
071310301, Union, IA
Built 1979 Load: 30.2 t ADT: 15
FM
FairOver: THREE MILE CREEK
073300408, Union, IA
Built 1985 Load: 30.2 t ADT: 60
LOCAL
FairOver: LITTLE FOX
068113402, Van Buren, IA
Built 1978 Load: 30.2 t ADT: 26
FM
FairOver: S. AVERY CREEK
073143104, Wapello, IA
Built 1975 Load: 30.2 t ADT: 670
FM
FairOver: S AVERY CREEK
072151007, Wapello, IA
Built 1975 Load: 30.2 t ADT: 50
FM
FairOver: WINNEBAGO RIVER
098242301, Winnebago, IA
Built 1974 Load: 30.2 t ADT: 330
LOCAL
FairOver: BIG WHISKEY
088461801, Woodbury, IA
Built 1978 Load: 30.2 t ADT: 40
LOCAL
FairOver: ELLIOTT CREEK
088462201, Woodbury, IA
Built 1979 Load: 30.2 t ADT: 71
LOCAL
FairOver: ELLIOTT CREEK
088462803, Woodbury, IA
Built 1979 Load: 30.2 t ADT: 40
LOCAL
FairOver: BR PATTERSON CREEK
099063208, Allamakee, IA
Built 1915 Load: 30.3 t ADT: 29
LOCAL
FairOver: BRANCH MUD CREEK
083102702, Benton, IA
Built 1984 Load: 30.3 t ADT: 11
FM 260TH AVE
FairOver: OVERFLOW LITTLE SIOUX
094360202, Clay, IA
Built 1966 Load: 30.3 t ADT: 71
210TH AVENUE
FairOver: DRAINAGE DITCH 5
080E20104, Clinton, IA
Built 1965 Load: 30.3 t ADT: 750
220TH STREET
FairOver: BROPHY CREEK
081E50403, Clinton, IA
Built 1964 Load: 30.3 t ADT: 1,010
350TH AVE
FairOver: BROPHY CREEK
081E52002, Clinton, IA
Built 1964 Load: 30.3 t ADT: 460
190TH STREET
FairOver: DRAINAGE DITCH 12
082E21901, Clinton, IA
Built 1967 Load: 30.3 t ADT: 320
Showing 5,551-5,600 of 20,753 bridges
Related
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.