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
LOCAL T-35
FairOver: DRAINAGE
071172504, Monroe, IA
Built 1964 Load: 14.4 t ADT: 60
JADE AVE
FairOver: DRAINAGE
090460304, Plymouth, IA
Built 1989 Load: 14.4 t ADT: 50
JESTER PARK
FairOver: PAW CREEK
081253303, Polk, IA
Built 1963 Load: 14.4 t ADT: 29
FM
FairOver: LONG CREEK
070263205, Decatur, IA
Built 1957 Load: 14.5 t ADT: 627
VINCENT AVE SE
FairOver: STREAM
078051004, Johnson, IA
Built 1970 Load: 14.5 t ADT: 20
NW CHAMBERS AVE
FairOver: STREAM
081080904, Johnson, IA
Built 1972 Load: 14.5 t ADT: 92
340TH
FairOver: SPRING CREEK
097160501, Mitchell, IA
Built 1927 Load: 14.5 t ADT: 97
395TH
FairOver: BURR OAK CREEK
098160503, Mitchell, IA
Built 1920 Load: 14.5 t ADT: 15
LOCAL
FairOver: LITTLE OCHEYDAN RIVER
098392802, Osceola, IA
Built 1941 Load: 14.5 t ADT: 21
LOCAL
FairOver: LITTLE OCHEYDAN RIVER
098401401, Osceola, IA
Built 1940 Load: 14.5 t ADT: 21
LOCAL
FairOver: DRY RUN
099392002, Osceola, IA
Built 1936 Load: 14.5 t ADT: 15
LOCAL
FairOver: STREAM
099401902, Osceola, IA
Built 1941 Load: 14.5 t ADT: 15
730TH AVE
FairOver: MARSHALL-STORY DD#2
082210102, Story, IA
Built 1944 Load: 14.5 t ADT: 30
140TH ST
FairOver: HAMILTON-STORY 1 OPEN DD
085242601, Story, IA
Built 1935 Load: 14.5 t ADT: 20
FM
FairOver: WEST 102 RIVER
067351501, Taylor, IA
Built 1939 Load: 14.5 t ADT: 210
FM
FairOver: EAST 102 RIVER
068343504, Taylor, IA
Built 1940 Load: 14.5 t ADT: 349
FM
FairOver: WEST BRANCH 102 RIVER
070343108, Taylor, IA
Built 1947 Load: 14.5 t ADT: 26
JIGSAW RD
FairOver: CEDAR CREEK
093033103, Clayton, IA
Built 1925 Load: 14.6 t ADT: 21
NORWOOD AVE
FairOver: HONEY CREEK
078433306, Harrison, IA
Built 1900 Load: 14.6 t ADT: 5
FM
FairOver: MOON CREEK
077141801, Mahaska, IA
Built 1965 Load: 14.6 t ADT: 190
LOCAL
FairOver: CYLINDER CREEK
097312702, Palo Alto, IA
Built 1972 Load: 14.6 t ADT: 15
HICKORY ROAD
FairOver: LITTLE SILVER CREEK
075411801, Pottawattamie, IA
Built 1985 Load: 14.6 t ADT: 11
LOCAL
FairOver: CREEK
096092806, Winneshiek, IA
Built 1900 Load: 14.6 t ADT: 26
LOCAL
FairOver: PAINT CREEK
097041703, Allamakee, IA
Built 1976 Load: 14.7 t ADT: 5
FM- 650TH ST
FairOver: MAPLE RIVER
090393303, Cherokee, IA
Built 1961 Load: 14.7 t ADT: 290
142 STREET
FairOver: PLUM CREEK
070422903, Fremont, IA
Built 1960 Load: 14.7 t ADT: 89
HICKORY ROAD
FairOver: MIDDLE SILVER CREEK
075411701, Pottawattamie, IA
Built 1985 Load: 14.7 t ADT: 15
LOCAL
FairOver: SAND CREEK
070281207, Ringgold, IA
Built 1972 Load: 14.7 t ADT: 15
LOCAL
FairOver: MILL CREEK TRIBUTARY
081400909, Shelby, IA
Built 1967 Load: 14.7 t ADT: 30
LOCAL
FairOver: STREAM
076313101, Adair, IA
Built 1955 Load: 14.8 t ADT: 21
FM - DALLAS
FairOver: TROUBLESOME RIVER
077352101, Cass, IA
Built 1959 Load: 14.8 t ADT: 20
LOCAL
FairOver: DEEP RIVER
078120602, Iowa, IA
Built 1962 Load: 14.8 t ADT: 11
500TH ST SE
FairOver: STREAM
078051301, Johnson, IA
Built 1971 Load: 14.8 t ADT: 35
LOCAL
FairOver: E FK GRAND RIVER
070292501, Ringgold, IA
Built 1936 Load: 14.8 t ADT: 5
LOCAL
FairOver: STREAM
086363402, Sac, IA
Built 1934 Load: 14.8 t ADT: 40
240TH AVE
FairOver: WAPSIPINICON RIVER
080E41208, Scott, IA
Built 1961 Load: 14.8 t ADT: 1,140
LOCAL FARM LANE
FairOver: BR WILLIAMS CREEK
096051703, Allamakee, IA
Built 1975 Load: 14.9 t ADT: 5
LOCAL
FairOver: HOCKETT CREEK
083373002, Crawford, IA
Built 1900 Load: 14.9 t ADT: 21
FM
FairOver: MILLER CREEK
084372906, Crawford, IA
Built 1958 Load: 14.9 t ADT: 368
FM
FairOver: EAST BOYER RIVER
084383604, Crawford, IA
Built 1954 Load: 14.9 t ADT: 110
FM
FairOver: JIM CREEK
077291502, Madison, IA
Built 1962 Load: 14.9 t ADT: 597
LOCAL
FairOver: DRAINAGE
077142704, Mahaska, IA
Built 1954 Load: 14.9 t ADT: 15
FM
FairOver: SMALL STREAM
074210504, Marion, IA
Built 1950 Load: 14.9 t ADT: 45
LOCAL RD
FairOver: SMALL
098390603, Osceola, IA
Built 1953 Load: 14.9 t ADT: 5
LOCAL
FairOver: STREAM
099390801, Osceola, IA
Built 1939 Load: 14.9 t ADT: 90
LOCAL
FairOver: LITTLE OCHEYEDAN RIVER
099403001, Osceola, IA
Built 1950 Load: 14.9 t ADT: 21
LOCAL RD
FairOver: SNOW CREEK
100421601, Osceola, IA
Built 1939 Load: 14.9 t ADT: 21
LOCAL
FairOver: D D #106
092371101, Buena Vista, IA
Built 1978 Load: 15.0 t ADT: 34
LOCAL
FairOver: SOLDIER CREEK
093372301, Buena Vista, IA
Built 1977 Load: 15.0 t ADT: 34
FM
FairOver: BRUSH CREEK
069273606, Decatur, IA
Built 1954 Load: 15.0 t ADT: 60
Showing 1,401-1,450 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.