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
W 108TH ST S
FairOver: SQUAW CREEK
079212402, Jasper, IA
Built 1992 Load: 22.1 t ADT: 51
LOCAL
FairOver: POTATO CREEK
081181703, Jasper, IA
Built 1996 Load: 22.1 t ADT: 11
LOC 230TH AVE
FairOver: JDD #100, 131 & 93
094273502, Kossuth, IA
Built 1984 Load: 22.1 t ADT: 11
LOC 70TH AVE
FairOver: HINE CREEK
094290702, Kossuth, IA
Built 1971 Load: 22.1 t ADT: 15
LOC 50TH AVE
FairOver: TRULNER CREEK
094303502, Kossuth, IA
Built 1984 Load: 22.1 t ADT: 21
LOC 210TH ST
FairOver: PRAIRIE CREEK
095271001, Kossuth, IA
Built 1982 Load: 22.1 t ADT: 419
LOC 80TH AVE
FairOver: FOUR MILE CREEK
095292002, Kossuth, IA
Built 1976 Load: 22.1 t ADT: 21
LOC 100TH AVE
FairOver: FOUR MILE CREEK
095292702, Kossuth, IA
Built 1976 Load: 22.1 t ADT: 72
LOC 180TH ST
FairOver: FOUR MILE CREEK
095292901, Kossuth, IA
Built 1977 Load: 22.1 t ADT: 62
LOC 230TH AVE
FairOver: PLUM CREEK
096271102, Kossuth, IA
Built 1979 Load: 22.1 t ADT: 11
LOC 270TH ST
FairOver: LOTTS CREEK
096300901, Kossuth, IA
Built 1978 Load: 22.1 t ADT: 41
LOC 200TH AVE
FairOver: LINDER CREEK
097272902, Kossuth, IA
Built 1984 Load: 22.1 t ADT: 62
LOC 50TH AVE
FairOver: CALAMUS CREEK
097300202, Kossuth, IA
Built 1981 Load: 22.1 t ADT: 26
LOC 350TH ST
FairOver: BLACK CAT CREEK
098303101, Kossuth, IA
Built 1978 Load: 22.1 t ADT: 35
LOC 450TH ST
FairOver: W BR BLUE EARTH RIVER
099291203, Kossuth, IA
Built 1978 Load: 22.1 t ADT: 26
LOC 90TH AVE
FairOver: MUD CREEK
099292802, Kossuth, IA
Built 1975 Load: 22.1 t ADT: 5
LOC 70TH AVE
FairOver: MUD CREEK
099293002, Kossuth, IA
Built 1981 Load: 22.1 t ADT: 50
LOC 50TH AVE
FairOver: MUD CREEK
099301402, Kossuth, IA
Built 1977 Load: 22.1 t ADT: 30
LOC 480TH ST
FairOver: W BR BLUE EARTH RIVER
100282901, Kossuth, IA
Built 1973 Load: 22.1 t ADT: 41
LOC 140TH AVE
FairOver: W BR BLUE EARTH RIVER
100282902, Kossuth, IA
Built 1977 Load: 22.1 t ADT: 50
LOCAL
FairOver: SUTTON CREEK
069050304, Lee, IA
Built 1977 Load: 22.1 t ADT: 30
110TH ST
FairOver: PRAIRIE CREEK
069050505, Lee, IA
Built 1976 Load: 22.1 t ADT: 30
FM
FairOver: SMALL STREAM
076052803, Louisa, IA
Built 1960 Load: 22.1 t ADT: 100
LOCAL ROAD
FairOver: SPRING CREEK
099460902, Lyon, IA
Built 1971 Load: 22.1 t ADT: 30
FM
FairOver: CEDAR CREEK
076272011, Madison, IA
Built 1964 Load: 22.1 t ADT: 259
LOCAL
FairOver: OLIVE BRANCH CREEK
074140104, Mahaska, IA
Built 1971 Load: 22.1 t ADT: 50
LOCAL
FairOver: S COAL CREEK
074171104, Mahaska, IA
Built 1971 Load: 22.1 t ADT: 45
LOCAL
FairOver: BLUFF CREEK
074173303, Mahaska, IA
Built 1971 Load: 22.1 t ADT: 60
LOCAL
FairOver: MUCHAKINOCK CREEK
076172801, Mahaska, IA
Built 1973 Load: 22.1 t ADT: 26
LOCAL
FairOver: MIDDLE CREEK
077162602, Mahaska, IA
Built 1971 Load: 22.1 t ADT: 60
LOCAL
FairOver: MIDDLE CREEK
077162608, Mahaska, IA
Built 1971 Load: 22.1 t ADT: 50
LOCAL
FairOver: COON CREEK
075210801, Marion, IA
Built 1961 Load: 22.1 t ADT: 35
LOCAL
FairOver: LUTES CREEK
082173001, Marshall, IA
Built 1984 Load: 22.1 t ADT: 62
FM
FairOver: SMALL STREAM
083190504, Marshall, IA
Built 1984 Load: 22.1 t ADT: 177
LOCAL
FairOver: NICKOLSON CREEK
084172105, Marshall, IA
Built 1984 Load: 22.1 t ADT: 62
LOCAL
FairOver: DRAINAGE FROM LAKE MIAMI
073172901, Monroe, IA
Built 1965 Load: 22.1 t ADT: 20
LOCAL
FairOver: NISHNABOTNA TRIB
071392401, Montgomery, IA
Built 1965 Load: 22.1 t ADT: 51
FM-PINOAK ROAD
FairOver: WALNUT CREEK
076381001, Pottawattamie, IA
Built 1956 Load: 22.1 t ADT: 278
305TH ST
FairOver: CREEK
080E30907, Scott, IA
Built 1971 Load: 22.1 t ADT: 90
LOCAL
FairOver: TROUBLESOME CREEK
083131106, Tama, IA
Built 1950 Load: 22.1 t ADT: 33
LOCAL
FairOver: DEER CREEK
084153101, Tama, IA
Built 1985 Load: 22.1 t ADT: 20
LOCAL
FairOver: CREEK
069341304, Taylor, IA
Built 1975 Load: 22.1 t ADT: 40
LOCAL ROAD
FairOver: BR OTTER CREEK
075232306, Warren, IA
Built 1977 Load: 22.1 t ADT: 72
LOCAL
FairOver: FELTERS BRANCH
076241901, Warren, IA
Built 1977 Load: 22.1 t ADT: 72
FM
FairOver: STREAM
087420301, Woodbury, IA
Built 2006 Load: 22.1 t ADT: 20
LOCAL
FairOver: WHITE FOX CREEK
090250101, Wright, IA
Built 1982 Load: 22.1 t ADT: 15
LOCAL ROAD
FairOver: OTTER CREEK
093252801, Wright, IA
Built 1985 Load: 22.1 t ADT: 21
LOCAL
FairOver: FIELD STREAM
083340702, Carroll, IA
Built 1900 Load: 22.2 t ADT: 79
LOCAL 560TH ST.
FairOver: WILLOW CREEK
091411801, Cherokee, IA
Built 1989 Load: 22.2 t ADT: 20
LOCAL
FairOver: EAST LONG CK
071273606, Clarke, IA
Built 1975 Load: 22.2 t ADT: 29
Showing 3,201-3,250 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.