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
FM
FairOver: MIDDLE RIVER
075291006, Madison, IA
Built 1983 Load: 30.5 t ADT: 329
FM
FairOver: BIG SLOUGH DRAINAGE DIT.
077040302, Muscatine, IA
Built 1968 Load: 30.5 t ADT: 150
ELMTREE ROAD
FairOver: GRAYBILL CREEK
075392901, Pottawattamie, IA
Built 1940 Load: 30.5 t ADT: 20
L14
FairOver: FLOYD RIVER
095433004, Sioux, IA
Built 1969 Load: 30.5 t ADT: 578
FM
FairOver: FLOYD RIVER
096430103, Sioux, IA
Built 1968 Load: 30.5 t ADT: 679
HWY 20
FairOver: DRAINAGE DITCH
088301401, Webster, IA
Built 1984 Load: 30.5 t ADT: 1,482
260TH STREET
FairOver: WEST FORK 102 RIVER
071342901, Adams, IA
Built 1970 Load: 30.6 t ADT: 20
LOCAL
FairOver: COOPER CREEK
068191202, Appanoose, IA
Built 1972 Load: 30.6 t ADT: 21
LOCAL
FairOver: STEIN CREEK
084120801, Benton, IA
Built 1977 Load: 30.6 t ADT: 34
LOCAL
FairOver: PRAIRIE CREEK
086103603, Benton, IA
Built 1978 Load: 30.6 t ADT: 88
FM 155TH ST
FairOver: PINE CREEK
090083105, Buchanan, IA
Built 1969 Load: 30.6 t ADT: 59
FM
FairOver: LIZARD CREEK SO BRANCH
089311202, Calhoun, IA
Built 1969 Load: 30.6 t ADT: 240
FM
FairOver: PURGATORY CREEK
085332401, Carroll, IA
Built 1969 Load: 30.6 t ADT: 180
LOCAL - TUCSON
FairOver: WEST NODAWAY RIVER
074340701, Cass, IA
Built 1972 Load: 30.6 t ADT: 35
LOCAL - 720TH
FairOver: SEVEN MILE CREEK
075340602, Cass, IA
Built 1978 Load: 30.6 t ADT: 30
FM L AVE
FairOver: BEAR CREEK
093412402, Cherokee, IA
Built 1979 Load: 30.6 t ADT: 219
FM
FairOver: STREAM
094140301, Chickasaw, IA
Built 1981 Load: 30.6 t ADT: 29
LOCAL
FairOver: WHITE BREAST CREEK
072253006, Clarke, IA
Built 1969 Load: 30.6 t ADT: 50
340TH ST
FairOver: BIG MEADOW CREEK
096361001, Clay, IA
Built 1981 Load: 30.6 t ADT: 105
230TH AVE
FairOver: DD #28
097362902, Clay, IA
Built 1979 Load: 30.6 t ADT: 123
GREAT RIVER RD
FairOver: PANTHER CR
091012604, Clayton, IA
Built 1968 Load: 30.6 t ADT: 344
FM
FairOver: GRIFFIN CREEK
082391701, Crawford, IA
Built 1962 Load: 30.6 t ADT: 349
FM
FairOver: BUCK CREEK
082391701, Crawford, IA
Built 1962 Load: 30.6 t ADT: 349
NATURE RD
FairOver: SMALL STREAM
090040904, Delaware, IA
Built 1940 Load: 30.6 t ADT: 26
LOCAL
FairOver: FLINT RIVER
071042107, Des Moines, IA
Built 1972 Load: 30.6 t ADT: 21
LOCAL
FairOver: CREEK
098352901, Dickinson, IA
Built 1974 Load: 30.6 t ADT: 26
FM
FairOver: LITTLE SIOUX RIVER
100371502, Dickinson, IA
Built 1970 Load: 30.6 t ADT: 51
LOCAL
FairOver: ACKLEY CREEK
094182402, Floyd, IA
Built 1979 Load: 30.6 t ADT: 26
FM
FairOver: GIZZARD CREEK
095153601, Floyd, IA
Built 1970 Load: 30.6 t ADT: 108
FM OLIVE AVE
FairOver: BEEDS CREEK
092202806, Franklin, IA
Built 1961 Load: 30.6 t ADT: 1,365
NETTLE AVE
FairOver: OTTER CREEK
093203202, Franklin, IA
Built 1978 Load: 30.6 t ADT: 20
FM
FairOver: MASON CREEK
079322603, Guthrie, IA
Built 1978 Load: 30.6 t ADT: 50
LOCAL
FairOver: COTTONWOOD CREEK
080301802, Guthrie, IA
Built 1974 Load: 30.6 t ADT: 89
FM
FairOver: BRUSHY CREEK
081333503, Guthrie, IA
Built 1979 Load: 30.6 t ADT: 60
FM
FairOver: SUGAR CREEK
073073004, Henry, IA
Built 1968 Load: 30.6 t ADT: 110
LOCAL
FairOver: BRUSH CREEK
085E30103, Jackson, IA
Built 1985 Load: 30.6 t ADT: 79
LOCAL
FairOver: CHERRY CREEK
080192910, Jasper, IA
Built 1971 Load: 30.6 t ADT: 527
FM
FairOver: PRAIRIE CREEK
080201403, Jasper, IA
Built 1971 Load: 30.6 t ADT: 630
WHITE OAK RD.
FairOver: SOUTH FORK WALNUT CREEK
083041608, Jones, IA
Built 1970 Load: 30.6 t ADT: 49
IA 21
FairOver: CEDAR CREEK
1.1 mi. N of jct. IA 92, Keokuk, IA
Built 1948 Load: 30.6 t ADT: 1,880
LOC 10TH AVE
FairOver: BLACK CAT CREEK
098303002, Kossuth, IA
Built 1978 Load: 30.6 t ADT: 26
LOCAL
FairOver: MUSCATINE SLOUGH
075023104, Louisa, IA
Built 1968 Load: 30.6 t ADT: 650
FM
FairOver: OVERFLOW
098433402, Lyon, IA
Built 1968 Load: 30.6 t ADT: 199
LOCAL ROAD
FairOver: TOM CREEK
100442402, Lyon, IA
Built 1969 Load: 30.6 t ADT: 15
FM
FairOver: N. FORK CLANTON CREEK
074270703, Madison, IA
Built 1986 Load: 30.6 t ADT: 40
FM
FairOver: MIDDLE CREEK
077163503, Mahaska, IA
Built 1971 Load: 30.6 t ADT: 60
IA 330
FairOver: LINN CREEK
1.8 MILES N OF JCT. US 30, Marshall, IA
Built 1964 Load: 30.6 t ADT: 2,390
FM-195TH ST
FairOver: STREAM
071432102, Mills, IA
Built 1970 Load: 30.6 t ADT: 110
FA-CARY AVE
FairOver: SILVER CREEK
073421301, Mills, IA
Built 1975 Load: 30.6 t ADT: 229
FM
FairOver: MUD CREEK
094411701, O'Brien, IA
Built 1968 Load: 30.6 t ADT: 71
Showing 5,751-5,800 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.