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: WATERWAY
076342201, Cass, IA
Built 1900 Load: 27.1 t ADT: 60
FM - 650TH ST
FairOver: BUFFALO CREEK
090423301, Cherokee, IA
Built 1973 Load: 27.1 t ADT: 350
LOCAL 420TH ST
FairOver: CREEK
093410601, Cherokee, IA
Built 1966 Load: 27.1 t ADT: 30
FM
FairOver: HICKEY CREEK
082381302, Crawford, IA
Built 1963 Load: 27.1 t ADT: 816
LOCAL
FairOver: MUDDY CREEK
098350401, Dickinson, IA
Built 1970 Load: 27.1 t ADT: 11
240TH STREET
FairOver: BEAVERDAM CREEK
093191801, Franklin, IA
Built 1980 Load: 27.1 t ADT: 26
100 TH
FairOver: BUTTRICKS CREEK
085300401, Greene, IA
Built 1977 Load: 27.1 t ADT: 15
FM & PANORA AVE
FairOver: WILLOW RIVER
081422905, Harrison, IA
Built 1972 Load: 27.1 t ADT: 100
LOCAL
FairOver: STREAM
079101702, Iowa, IA
Built 1976 Load: 27.1 t ADT: 80
FM
FairOver: LONG CREEK
074041604, Louisa, IA
Built 1977 Load: 27.1 t ADT: 45
LOCAL ROAD
FairOver: LITTLE ROCK RIVER
099433201, Lyon, IA
Built 1970 Load: 27.1 t ADT: 34
FM
FairOver: MIDDLE RIVER
075291306, Madison, IA
Built 1981 Load: 27.1 t ADT: 50
LOCAL
FairOver: HAITZ DD
085451201, Monona, IA
Built 1962 Load: 27.1 t ADT: 20
MALLARD AVE
FairOver: SMALL NATURAL STREAM
093452329, Plymouth, IA
Built 1974 Load: 27.1 t ADT: 5
FM
FairOver: JORDAN CREEK
074393003, Pottawattamie, IA
Built 1957 Load: 27.1 t ADT: 100
FM
FairOver: PLATTE RIVER
069310301, Ringgold, IA
Built 1969 Load: 27.1 t ADT: 379
US 18
FairOver: FLOYD RIVER
0.2 W of Jct. SR L26, Sioux, IA
Built 1992 Load: 27.1 t ADT: 5,100
FM
FairOver: DUCK VALLEY CREEK
070212305, Wayne, IA
Built 1965 Load: 27.1 t ADT: 280
FM
FairOver: LITTLE SIOUX RIVER
086430703, Woodbury, IA
Built 1966 Load: 27.1 t ADT: 319
LOCAL RD
FairOver: TEEPLE CREEK
097061302, Allamakee, IA
Built 1960 Load: 27.2 t ADT: 128
LOCAL
FairOver: VILLAGE CREEK
098052301, Allamakee, IA
Built 1965 Load: 27.2 t ADT: 44
FM F-65
FairOver: CROOKED CREEK
078343301, Audubon, IA
Built 1936 Load: 27.2 t ADT: 60
FM
FairOver: DD #65
088321802, Calhoun, IA
Built 1987 Load: 27.2 t ADT: 957
FM
FairOver: STORM CREEK
085343101, Carroll, IA
Built 1964 Load: 27.2 t ADT: 1,047
140TH ST
FairOver: BR YANKEE RUN
082022501, Cedar, IA
Built 2006 Load: 27.2 t ADT: 100
VIOLET ST
FairOver: ROCK FALLS CREEK
097190304, Cerro Gordo, IA
Built 1900 Load: 27.2 t ADT: 26
LOCAL
FairOver: CREEK
072271903, Clarke, IA
Built 1980 Load: 27.2 t ADT: 11
463RD AVENUE
FairOver: CREEK
082E71804, Clinton, IA
Built 1923 Load: 27.2 t ADT: 11
LOCAL CO.LINE
FairOver: SMALL STREAM
083E60103, Clinton, IA
Built 1993 Load: 27.2 t ADT: 78
LOC CANDLE RD
FairOver: PRAIRIE CREEK
089062805, Delaware, IA
Built 1950 Load: 27.2 t ADT: 59
EAST 16TH ST
FairOver: LAKE PEOSTA CHANNEL
000000000, Dubuque, IA
Built 1982 Load: 27.2 t ADT: 9,191
COUNTY RD X-40
FairOver: WALNUT CREEK
083031804, Jones, IA
Built 1960 Load: 27.2 t ADT: 770
220TH ST.
FairOver: BRANCH OF SILVER CREEK
086042001, Jones, IA
Built 1980 Load: 27.2 t ADT: 91
LOCAL(DEAD END)
FairOver: TRIB S FK ENGLISH RIVER
077121603, Keokuk, IA
Built 1996 Load: 27.2 t ADT: 11
LOCAL
FairOver: DRAINAGE
075270304, Madison, IA
Built 1959 Load: 27.2 t ADT: 29
US 169
FairOver: MIDDLE RIVER
2.2 MI. S OF S JCT. IA 92, Madison, IA
Built 1976 Load: 27.2 t ADT: 1,890
380TH
FairOver: LITTLE CEDAR RIVER
098161303, Mitchell, IA
Built 1979 Load: 27.2 t ADT: 44
430TH
FairOver: LITTLE CEDAR RIVER
099161503, Mitchell, IA
Built 1984 Load: 27.2 t ADT: 403
LOCAL
FairOver: MCCABDLESS CLEGHORN DD
085462302, Monona, IA
Built 2004 Load: 27.2 t ADT: 34
FM
FairOver: CREEK
073381402, Montgomery, IA
Built 1975 Load: 27.2 t ADT: 60
MAGNOLIA ROAD
FairOver: STREAM
076401903, Pottawattamie, IA
Built 1953 Load: 27.2 t ADT: 11
LOCAL
FairOver: STREAM
078140102, Poweshiek, IA
Built 1960 Load: 27.2 t ADT: 30
FM RD F16
FairOver: W FORK/W NISHNABOTNA
081380501, Shelby, IA
Built 1970 Load: 27.2 t ADT: 60
E 13TH ST
FairOver: SKUNK RIVER
083240103, Story, IA
Built 1968 Load: 27.2 t ADT: 13,164
710TH AVE
FairOver: HARDIN-STORY DD I
085210304, Story, IA
Built 1947 Load: 27.2 t ADT: 60
IA 28
FairOver: NORTH RIVER
0.6 MILES N OF SR G24, Warren, IA
Built 1983 Load: 27.2 t ADT: 5,900
FM
FairOver: NORTH FORK LONG CREEK
075060702, Washington, IA
Built 1969 Load: 27.2 t ADT: 100
375TH
FairOver: DRAINAGE DITCH
098211803, Worth, IA
Built 1940 Load: 27.2 t ADT: 11
SB I-35
FairOver: IOWA RIVER
4.0 mi. N of SR C 70, Wright, IA
Built 1974 Load: 27.2 t ADT: 8,250
E CEDAR-WAPSI RD
FairOver: WAPSIPINCON RIVER
90-11-10-03, Black Hawk, IA
Built 1969 Load: 27.3 t ADT: 1,493
Showing 4,801-4,850 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.