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: CANOE CREEK BRANCH
099080205, Winneshiek, IA
Built 1971 Load: 18.1 t ADT: 265
POLE LINE RD
FairOver: SMALL STREAM
099092904, Winneshiek, IA
Built 1950 Load: 18.1 t ADT: 344
LOCAL ROAD
FairOver: CREEK
099101703, Winneshiek, IA
Built 1968 Load: 18.1 t ADT: 40
LOCAL ROAD
FairOver: DRAINAGE
100071003, Winneshiek, IA
Built 1969 Load: 18.1 t ADT: 70
FM
FairOver: SILVER CREEK
100092601, Winneshiek, IA
Built 1973 Load: 18.1 t ADT: 560
FM
FairOver: CREEK
100092803, Winneshiek, IA
Built 1962 Load: 18.1 t ADT: 560
FM
FairOver: PINE CREEK
100092804, Winneshiek, IA
Built 1962 Load: 18.1 t ADT: 120
FM
FairOver: PINE CREEK
100092901, Winneshiek, IA
Built 1962 Load: 18.1 t ADT: 560
FM
FairOver: CREEK
100101501, Winneshiek, IA
Built 1961 Load: 18.1 t ADT: 120
LOCAL RD
FairOver: SHANGHAR CREEK
074322703, Adair, IA
Built 1960 Load: 18.2 t ADT: 15
FM
FairOver: SMALL STREAM
069182602, Appanoose, IA
Built 1961 Load: 18.2 t ADT: 130
FM
FairOver: WEST CEDAR
087310701, Calhoun, IA
Built 1955 Load: 18.2 t ADT: 5
BACKBONE ST PK
FairOver: MAQUOKETA RIVER
IN BACKBONE STATE PARK, Delaware, IA
Built 1976 Load: 18.2 t
140TH ST NE
FairOver: STREAM
081071603, Johnson, IA
Built 1977 Load: 18.2 t ADT: 663
LOCAL RD
FairOver: DRAINAGE
076290402, Madison, IA
Built 1962 Load: 18.2 t ADT: 15
NEST AVE
FairOver: OTTER CREEK OVERFLOW
098422802, Osceola, IA
Built 1954 Load: 18.2 t ADT: 103
LOCAL
FairOver: OTTER CREEK
098422902, Osceola, IA
Built 1949 Load: 18.2 t ADT: 41
LOCAL
FairOver: STREAM
099390901, Osceola, IA
Built 1954 Load: 18.2 t ADT: 46
LOCAL ROAD
FairOver: CAMP CREEK
079222305, Polk, IA
Built 1958 Load: 18.2 t ADT: 34
FM
FairOver: DRAINAGE
081220702, Polk, IA
Built 1967 Load: 18.2 t ADT: 439
LOCAL
FairOver: MCELHANEY CREEK
089431802, Woodbury, IA
Built 2007 Load: 18.2 t ADT: 50
LOCAL
FairOver: BR MUD CREEK
083102703, Benton, IA
Built 1972 Load: 18.3 t ADT: 15
LOCAL
FairOver: BR PRAIRIE CK
083112401, Benton, IA
Built 1978 Load: 18.3 t ADT: 50
LOCAL
FairOver: BR PRATT CK
086112602, Benton, IA
Built 1975 Load: 18.3 t ADT: 20
HARMON RD
FairOver: SPRING CREEK
87-11-27-01-10, Black Hawk, IA
Built 1948 Load: 18.3 t ADT: 39
HESS RD
FairOver: TRIB TO MILLER CREEK
87-13-25-02-10, Black Hawk, IA
Built 1961 Load: 18.3 t ADT: 20
E TAMA RD
FairOver: TRIB TO MILLER CREEK
87-13-35-01-10, Black Hawk, IA
Built 1974 Load: 18.3 t ADT: 314
FM
FairOver: ELK RUN CREEK
085340302, Carroll, IA
Built 1965 Load: 18.3 t ADT: 89
LOCAL
FairOver: BUFFALO CREEK
084392707, Crawford, IA
Built 1939 Load: 18.3 t ADT: 82
LOCAL
FairOver: CREEK
068121304, Davis, IA
Built 1959 Load: 18.3 t ADT: 34
LOCAL
FairOver: PRAIRIE CREEK
087E12306, Dubuque, IA
Built 1930 Load: 18.3 t ADT: 118
LOCAL ROAD
FairOver: SOLDIER RIVER
086402102, Ida, IA
Built 1967 Load: 18.3 t ADT: 11
FM
FairOver: CREEK
073083002, Jefferson, IA
Built 1950 Load: 18.3 t ADT: 50
SW OBSERVATORY
FairOver: BRANCH OF CROOKED CREEK
078062804, Johnson, IA
Built 1984 Load: 18.3 t ADT: 122
LOC 80TH AVE
FairOver: HINE CREEK
094291702, Kossuth, IA
Built 1987 Load: 18.3 t ADT: 15
LOC 80TH AVE
FairOver: HINE CREEK
094291702, Kossuth, IA
Built 1987 Load: 18.3 t ADT: 15
LOCAL
FairOver: BURNETT CR
085173301, Marshall, IA
Built 1940 Load: 18.3 t ADT: 47
LOCAL
FairOver: WATERMAN CREEK
094392305, O'Brien, IA
Built 1950 Load: 18.3 t ADT: 41
270TH ST
FairOver: WEST BR INDIAN CREEK
083223101, Story, IA
Built 1967 Load: 18.3 t ADT: 80
LOCAL
FairOver: CREEK
069352401, Taylor, IA
Built 1977 Load: 18.3 t ADT: 5
LOCAL
FairOver: BUTTRICK CREEK
086302901, Webster, IA
Built 1990 Load: 18.3 t ADT: 11
E MARQUIS RD
FairOver: TRIB TO CRANE CREEK
90-11-06-01-10, Black Hawk, IA
Built 2001 Load: 18.4 t ADT: 187
NOLAN AVE
FairOver: SAND CREEK
087082002, Buchanan, IA
Built 2012 Load: 18.4 t ADT: 30
MARSH AVE.
FairOver: SMALL STREAM
092161802, Butler, IA
Built 1961 Load: 18.4 t ADT: 82
LOCAL
FairOver: MIDDLE WILLOW CREEK
084413102, Crawford, IA
Built 2009 Load: 18.4 t ADT: 34
LOCAL
FairOver: STREAM
069242502, Decatur, IA
Built 1910 Load: 18.4 t ADT: 15
LOCAL
FairOver: STREAM
081090302, Iowa, IA
Built 1980 Load: 18.4 t ADT: 11
LOCAL RD
FairOver: SMITH CREEK
077091902, Keokuk, IA
Built 1997 Load: 18.4 t ADT: 71
FM
FairOver: SILVER CREEK
074413001, Pottawattamie, IA
Built 1958 Load: 18.4 t ADT: 79
LOCAL
FairOver: BRANCH OF SALT CREEK
084142804, Tama, IA
Built 1984 Load: 18.4 t ADT: 33
Showing 2,201-2,250 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.