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
PoorOver: BIRCH CREEK
078092502, Iowa, IA
Built 1963 ADT: 11
LOCAL
PoorOver: DRAINAGE DITCH
079110504, Iowa, IA
Built 1955 ADT: 20
FM LEGNO
PoorOver: DEVIL'S RUN
079122401, Iowa, IA
Built 1900
EAST LINE ST
PoorOver: BEERS CREEK
000000000, Jackson, IA
Built 1902 ADT: 20
LOCAL
PoorOver: SMALL CREEK
085E21704, Jackson, IA
Built 1940 ADT: 11
S 112TH AVE E
PoorOver: ELK CREEK
078182601, Jasper, IA
Built 1948 ADT: 20
W 36TH ST S
PoorOver: BUCK CREEK
078191908, Jasper, IA
Built 1928 ADT: 91
S 104TH AVE W
PoorOver: WALNUT CREEK
078212203, Jasper, IA
Built 1945 ADT: 5
S 64TH AVE E
PoorOver: SUGAR CREEK
079172505, Jasper, IA
Built 1933 ADT: 45
S 60TH AVE E
PoorOver: SMALL STREAM
079182803, Jasper, IA
Built 1932 ADT: 42
W 84TH ST S
PoorOver: RED ROCK CREEK
079203304, Jasper, IA
Built 1947 ADT: 11
LOCAL
PoorOver: ALLOWAY CREEK
080180402, Jasper, IA
Built 1965 ADT: 16
LOCAL
PoorOver: ALLOWAY CREEK
081182801, Jasper, IA
Built 1937 ADT: 16
LOCAL
PoorOver: SNIPE CREEK
081190302, Jasper, IA
Built 1941 ADT: 11
LOCAL
PoorOver: MUD CREEK
081210203, Jasper, IA
Built 1939 ADT: 15
LOCAL
PoorOver: WOLF CREEK
081211603, Jasper, IA
Built 1947 ADT: 21
LOCAL
PoorOver: INDIAN CREEK
081211803, Jasper, IA
Built 1914 ADT: 20
LOCAL
PoorOver: TROY CREEK
071092207, Jefferson, IA
Built 1915 ADT: 5
LOCAL
PoorOver: MITCHELL CREEK
072101608, Jefferson, IA
Built 1962 ADT: 80
FM
PoorOver: ROCK CREEK
071110402, Jefferson, IA
Built 1963 ADT: 50
ORANGE BLVD
PoorOver: MIDDLE WALNUT CREEK
073092104, Jefferson, IA
Built 1922 ADT: 15
UTAH AVE SE
PoorOver: STREAM
078053302, Johnson, IA
Built 1990 ADT: 46
SW JAMES AVE
PoorOver: STREAM
078072202, Johnson, IA
Built 1956 ADT: 41
IOWA JOHNSON RD
PoorOver: STREAM
079081904, Johnson, IA
Built 1925 ADT: 11
LANDIS RD
PoorOver: WAPSIPINICON RIVER
084031903, Jones, IA
Built 1909 ADT: 78
STONE BRIDGE RD
PoorOver: WET CREEK
086031704, Jones, IA
Built 1893 ADT: 294
LOCAL
PoorOver: CEDAR CREEK
076133504, Keokuk, IA
Built 1952 ADT: 46
LOCAL RD
PoorOver: SOUTH FORK ENGLISH RIVER
077101106, Keokuk, IA
Built 1960 ADT: 31
FM 160TH ST
PoorOver: LOTTS CREEK
094300501, Kossuth, IA
Built 1967 ADT: 45
FM 320TH ST
PoorOver: BUFFALO CREEK
097281201, Kossuth, IA
Built 1958 ADT: 309
FM 180TH AVE
PoorOver: BUFFALO CREEK
097281202, Kossuth, IA
Built 1965 ADT: 159
LOC 130TH AVE
PoorOver: DD #185
100280702, Kossuth, IA
Built 1900 ADT: 5
FM
PoorOver: LOST CREEK
068040404, Lee, IA
Built 1953 ADT: 1,310
LOCAL
PoorOver: BRANCH OF SUGAR CREEK
068073203, Lee, IA
Built 1940 ADT: 16
LOCAL
PoorOver: HELL HOLLOW CREEK
069051203, Lee, IA
Built 1958 ADT: 71
LOCAL
PoorOver: SMALL STREAM
073030702, Louisa, IA
Built 1920 ADT: 11
V AVE
PoorOver: BUFFINGTON CREEK
074052302, Louisa, IA
Built 1893 ADT: 11
FM
PoorOver: STREAM
075050802, Louisa, IA
Built 1963 ADT: 60
LOCAL
PoorOver: BR OF CEDAR CREEK
071200205, Lucas, IA
Built 1937 ADT: 16
LOCAL
PoorOver: HONEY CREEK
071201503, Lucas, IA
Built 1928 ADT: 5
LOCAL
PoorOver: BR OF LITTLE WHITEBREAST
071210101, Lucas, IA
Built 1949 ADT: 11
LOCAL
PoorOver: CHARITON RIVER
071220203, Lucas, IA
Built 1934 ADT: 16
LOCAL
PoorOver: HONEY CREEK
071222404, Lucas, IA
Built 1951 ADT: 5
LOCAL
PoorOver: FIVE MILE CREEK
071223101, Lucas, IA
Built 1948 ADT: 47
LOCAL
PoorOver: FIVE MILE CREEK
071223102, Lucas, IA
Built 1940 ADT: 16
LOCAL
PoorOver: DR TO FIVE MILE CREEK
071223102, Lucas, IA
Built 1940 ADT: 16
LOCAL
PoorOver: WOLF CREEK
071223504, Lucas, IA
Built 1900 ADT: 20
LOCAL
PoorOver: CHARITON RIVER
071231303, Lucas, IA
Built 1946 ADT: 11
LOCAL
PoorOver: LITTLE WHITEBREAST CREEK
072210403, Lucas, IA
Built 1969 ADT: 26
LOCAL
PoorOver: BR OF WHITEBREAST CREEK
072222905, Lucas, IA
Built 1938 ADT: 11
Showing 16,801-16,850 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.