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
290TH ST
FairOver: S.BR.CROOKED CREEK
087280805, Webster, IA
Built 1950 Load: 15.9 t ADT: 1,147
FM
FairOver: VILLAGE CREEK
098040903, Allamakee, IA
Built 1968 Load: 16.0 t ADT: 25
LOCAL
FairOver: STREAM
067171904, Appanoose, IA
Built 1977 Load: 16.0 t ADT: 21
COUNTY RD
FairOver: CROOKED CREEK
FM 078342402, Audubon, IA
Built 1955 Load: 16.0 t ADT: 15
IVANHOE ST
FairOver: RIVER
091130904, Bremer, IA
Built 1961 Load: 16.0 t ADT: 59
340TH
FairOver: ROCK FALLS CREEK
097319003, Cerro Gordo, IA
Built 1924 Load: 16.0 t ADT: 39
LOCAL
FairOver: TURKEY RUN
068240302, Decatur, IA
Built 1951 Load: 16.0 t ADT: 5
FM
FairOver: HOG CREEK
068242506, Decatur, IA
Built 1955 Load: 16.0 t ADT: 20
LOCAL
FairOver: S ELK CREEK
068270903, Decatur, IA
Built 2002 Load: 16.0 t ADT: 11
FM
FairOver: ELK CREEK
069270503, Decatur, IA
Built 1950 Load: 16.0 t ADT: 26
FM
FairOver: BIG HOLLOW CREEK
071042503, Des Moines, IA
Built 1955 Load: 16.0 t ADT: 100
600 140TH ST
FairOver: DD #8
094251801, Hancock, IA
Built 1955 Load: 16.0 t ADT: 15
LOCAL
FairOver: TIPTON CREEK
088223302, Hardin, IA
Built 1900 Load: 16.0 t ADT: 25
FM
FairOver: PRICE CREEK
081100203, Iowa, IA
Built 1956 Load: 16.0 t ADT: 60
S 68TH AVE E
FairOver: N SKUNK RIVER
079173401, Jasper, IA
Built 1955 Load: 16.0 t ADT: 25
FM
FairOver: CHARITON RIVER
071211504, Lucas, IA
Built 1970 Load: 16.0 t ADT: 25
LOCAL RD
FairOver: JONES CREEK
075262104, Madison, IA
Built 1975 Load: 16.0 t ADT: 5
LCL-OMAN AVE
FairOver: DEER CREEK
071401701, Mills, IA
Built 1962 Load: 16.0 t ADT: 26
LOCAL
FairOver: STREAM
099391602, Osceola, IA
Built 1940 Load: 16.0 t ADT: 30
LOCAL
FairOver: OCHEYEDAN RIVER
099400902, Osceola, IA
Built 1939 Load: 16.0 t ADT: 72
LOCAL
FairOver: OTTER CREEK
100422502, Osceola, IA
Built 1940 Load: 16.0 t ADT: 21
LOCAL
FairOver: OTTER CREEK
100422602, Osceola, IA
Built 1938 Load: 16.0 t ADT: 50
230TH STREET
FairOver: TARKIO RIVER
068381601, Page, IA
Built 1948 Load: 16.0 t ADT: 34
LOCAL
FairOver: PILOT CREEK
092310104, Pocahontas, IA
Built 1954 Load: 16.0 t ADT: 71
LOCAL
FairOver: SOUTH BRANCH SALT CREEK
084133002, Tama, IA
Built 1940 Load: 16.0 t ADT: 49
LOCAL
FairOver: CAMP CREEK
077083601, Washington, IA
Built 1954 Load: 16.0 t ADT: 161
250TH STREET
FairOver: W BRANCH 102 RIVER
071332001, Adams, IA
Built 1957 Load: 16.1 t ADT: 50
110TH STREET
FairOver: THOMPSON CREEK
073330701, Adams, IA
Built 1955 Load: 16.1 t ADT: 15
LOCAL
FairOver: BR RACCOON RIVER
093363404, Buena Vista, IA
Built 1976 Load: 16.1 t ADT: 45
FM
FairOver: PURGATORY
086333601, Calhoun, IA
Built 1938 Load: 16.1 t ADT: 34
LOCAL
FairOver: FIELD STREAM
082332302, Carroll, IA
Built 1972 Load: 16.1 t ADT: 50
FM
FairOver: WEST NISHNABOTNA RIVER
083363501, Carroll, IA
Built 1991 Load: 16.1 t ADT: 45
LOCAL
FairOver: FIELD STREAM
085351502, Carroll, IA
Built 1993 Load: 16.1 t ADT: 45
LOCAL K AVE
FairOver: BEAR CREEK
093412302, Cherokee, IA
Built 1927 Load: 16.1 t ADT: 30
LOCAL
FairOver: SMALL STREAM
082380602, Crawford, IA
Built 2001 Load: 16.1 t ADT: 21
FM
FairOver: MIDDLE RACOON
080310913, Guthrie, IA
Built 1958 Load: 16.1 t ADT: 100
FM
FairOver: BRUSH CREEK
070050603, Henry, IA
Built 1956 Load: 16.1 t ADT: 50
LOCAL
FairOver: INDIAN CREEK
073222902, Lucas, IA
Built 1954 Load: 16.1 t ADT: 47
LOCAL
FairOver: STREAM
077273302, Madison, IA
Built 1981 Load: 16.1 t ADT: 60
FM
FairOver: ENGLISH CREEK
074200403, Marion, IA
Built 1954 Load: 16.1 t ADT: 230
US 69
FairOver: FOURMILE CREEK
1.3 miles N of IA 160, Polk, IA
Built 1949 Load: 16.1 t ADT: 6,800
MAGNOLIA ROAD
FairOver: STREAM
076392201, Pottawattamie, IA
Built 1985 Load: 16.1 t ADT: 5
FM
FairOver: W FORK GRAND RIVER
069301901, Ringgold, IA
Built 1966 Load: 16.1 t ADT: 34
FM
FairOver: SMALL
067322843, Taylor, IA
Built 1963 Load: 16.1 t ADT: 61
FM
FairOver: BRUSH CREEK
071143306, Wapello, IA
Built 1955 Load: 16.1 t ADT: 150
FM
FairOver: COMPETINE CREEK
073121507, Wapello, IA
Built 1962 Load: 16.1 t ADT: 130
LOCAL 335TH ST.
FairOver: SMALL STREAM
087083603, Buchanan, IA
Built 1998 Load: 16.2 t ADT: 78
FM 145TH ST
FairOver: LITTLE WAPSIPINICON
090102805, Buchanan, IA
Built 1965 Load: 16.2 t ADT: 137
FM
FairOver: NORTH RACOON RIVER
085330801, Carroll, IA
Built 1940 Load: 16.2 t ADT: 71
280TH ST
FairOver: PANTHER CREEK
079282703, Dallas, IA
Built 1968 Load: 16.2 t ADT: 500
Showing 1,601-1,650 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.