Total Bridges
20,753
Public highway bridges in Iowa
State profile · Above national median SD
Iowa bridge safety
Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in Iowa — drawn straight from the FHWA National Bridge Inventory.
- 20,753
- Public bridges
- 36.5%
- Good condition
- 20.0%
- Poor condition
- 20.0%
- Structurally deficient
Good Condition
36.5%
7,582 bridges rated 7-9
-13.5pp vs 50% benchmark
Poor Condition
20.0%
4,153 bridges rated 0-4
Structurally Deficient
20.0%
4,153 bridges flagged for repair priority
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 — Structurally deficient share 66.7%
National avg
Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.
Condition Distribution
Bridge inventory deck-condition mix — Iowa (FHWA NBI)
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 on the structurally deficient leaderboard (lower share = better)
States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below Iowa on the same metric.
54
West Virginia
16.02% top marginal rate
46
South Dakota
16.24% top marginal rate
19
Iowa
20.01% top marginal rate
78
Virgin Islands
29.17% top marginal rate
Bridges Needing Most Attention in Iowa
Six lowest-condition bridges in Iowa, ranked by composite NBI rating. Each is inspected at least every 24 months.
270TH STREET
Structurally DeficientOver: 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
Structurally DeficientOver: MUD CREEK
87-12-15-02-10, Black Hawk, IA
Built 1948 Load: 2.7 t ADT: 11
LOCAL - 700TH
Structurally DeficientOver: TRIB TROUBLESOME CREEK
077351402, Cass, IA
Built 1983 Load: 2.7 t ADT: 11
LOCAL - DAYTONA
Structurally DeficientOver: BUCK CREEK
077361903, Cass, IA
Built 1980 Load: 2.7 t ADT: 35
100TH ST.
Structurally DeficientOver: UNION CREEK
083E20101, Clinton, IA
Built 1900 Load: 2.7 t ADT: 78
All Bridges in Iowa
FM
Structurally DeficientOver: BRANCH YELLOW RIVER
096041807, Allamakee, IA
Built 1959 Load: 20.1 t ADT: 70
FM
Structurally DeficientOver: IOWA RIVER
081121104, Iowa, IA
Built 1952 Load: 20.1 t ADT: 110
FM
Structurally DeficientOver: SMALL
068330404, Taylor, IA
Built 1978 Load: 20.1 t ADT: 20
LOCAL
Structurally DeficientOver: STREAM
074192706, Marion, IA
Built 1972 Load: 20.2 t ADT: 34
FM-215TH ST
Structurally DeficientOver: CREEK
071431004, Mills, IA
Built 1969 Load: 20.3 t ADT: 91
LOCAL
Structurally DeficientOver: SMALL STREAM
073311602, Union, IA
Built 1979 Load: 20.3 t ADT: 15
LOCAL
Structurally DeficientOver: BR OPOSSUM CK
084101102, Benton, IA
Built 1970 Load: 20.5 t ADT: 34
FM
Structurally DeficientOver: WEST FORK LITTLE SIOUX
087451502, Woodbury, IA
Built 1955 Load: 20.5 t ADT: 549
FM
Structurally DeficientOver: DRAINAGE DITCH
091232004, Wright, IA
Built 1926 Load: 20.6 t ADT: 34
OLD HWY RD
Structurally DeficientOver: BLOODY RUN CREEK
095152012, Floyd, IA
Built 1927 Load: 20.7 t ADT: 687
LOCAL
Structurally DeficientOver: STREAM
078330103, Guthrie, IA
Built 1940 Load: 20.7 t ADT: 5
FREMONT/PAGE
Structurally DeficientOver: STREAM
067391902, Page, IA
Built 1977 Load: 20.7 t ADT: 10
252ND ST
Structurally DeficientOver: STREAM
087432311, Woodbury, IA
Built 1985 Load: 20.8 t ADT: 5
LOCAL
Structurally DeficientOver: TRIB TO MASON CREEK
079321306, Guthrie, IA
Built 1977 Load: 20.9 t ADT: 40
190TH STREET
Structurally DeficientOver: BROWN BRANCH
072332101, Adams, IA
Built 1965 Load: 21.0 t ADT: 349
FM-CHESTNUT AVE
Structurally DeficientOver: WILLIAMS CREEK
073350302, Adams, IA
Built 1959 Load: 21.0 t ADT: 190
FM-CHESTNUT AVE
Structurally DeficientOver: PETERSONS CREEK
073350302, Adams, IA
Built 1959 Load: 21.0 t ADT: 190
FM LAKE DRIVE
Structurally DeficientOver: OVER CNW RR
092202009, Franklin, IA
Built 1936 Load: 21.0 t ADT: 255
FM
Structurally DeficientOver: TROUBLESOME CREEK
079332202, Guthrie, IA
Built 1948 Load: 21.0 t ADT: 40
FM
Structurally DeficientOver: SMALL
084151902, Tama, IA
Built 1963 Load: 21.0 t ADT: 20
FM
Structurally DeficientOver: VILLAGE CREEK
071141004, Wapello, IA
Built 1961 Load: 21.0 t ADT: 950
LOCAL ROAD
Structurally DeficientOver: SOUTH FORK LONG CREEK
075062806, Washington, IA
Built 1914 Load: 21.0 t ADT: 11
FM
Structurally DeficientOver: S FORK MAQUOKETA RIVER
084E11303, Jackson, IA
Built 1982 Load: 21.1 t ADT: 80
9TH AVENUE
Structurally DeficientOver: SMITH CREEK
077092400, Washington, IA
Built 1928 Load: 21.1 t ADT: 920
320TH ST
Structurally DeficientOver: MUD CREEK
090443001, Plymouth, IA
Built 1900 Load: 21.2 t ADT: 11
LOCAL ROAD
Structurally DeficientOver: LITTLE CREEK
081250501, Polk, IA
Built 1917 Load: 21.2 t ADT: 80
FM - 710TH
Structurally DeficientOver: WATERWAY
076352504, Cass, IA
Built 1958 Load: 21.3 t ADT: 20
LOCAL
Structurally DeficientOver: BRANCH OF IOWA RIVER
082143202, Tama, IA
Built 1950 Load: 21.3 t ADT: 5
LOCAL
Structurally DeficientOver: SMALL STREAM
072313501, Union, IA
Built 1964 Load: 21.4 t ADT: 11
J35
Structurally DeficientOver: DRAINAGE DITCH
069332801, Taylor, IA
Built 1938 Load: 21.7 t ADT: 210
FM
Structurally DeficientOver: WEST FORK LITTLE SIOUX
087451605, Woodbury, IA
Built 1955 Load: 21.7 t ADT: 429
FM
Structurally DeficientOver: ROCK CREEK
082031504, Cedar, IA
Built 1958 Load: 21.8 t ADT: 60
LOCAL
Structurally DeficientOver: LOCAL CREEK
071250304, Clarke, IA
Built 1968 Load: 21.8 t ADT: 20
FM
Structurally DeficientOver: STREAM
068142404, Davis, IA
Built 1966 Load: 21.8 t ADT: 480
LOCAL
Structurally DeficientOver: UPPER IOWA RIVER
098081206, Winneshiek, IA
Built 1985 Load: 21.8 t ADT: 207
LOCAL
Structurally DeficientOver: SMALL STREAM
073303401, Union, IA
Built 1992 Load: 21.9 t ADT: 21
FM
Structurally DeficientOver: SALT CREEK
084141103, Tama, IA
Built 1965 Load: 22.0 t ADT: 344
FM
Structurally DeficientOver: SPRING CREEK
086112001, Benton, IA
Built 1959 Load: 22.1 t ADT: 430
FM
Structurally DeficientOver: CREEK
086243604, Hamilton, IA
Built 1957 Load: 22.1 t ADT: 240
FM
Structurally DeficientOver: UNNAMED CREEK
0893925, Ida, IA
Built 1961 Load: 22.1 t ADT: 598
FM
Structurally DeficientOver: SOUTH CHEQUEST LAKE CRK
069121302, Davis, IA
Built 1965 Load: 22.3 t ADT: 70
W 108TH ST S
Structurally DeficientOver: SMALL STREAM
079212502, Jasper, IA
Built 1947 Load: 22.3 t ADT: 41
LOCAL
Structurally DeficientOver: MIDDLE CREEK
076142910, Mahaska, IA
Built 1965 Load: 22.3 t ADT: 40
FM
Structurally DeficientOver: W FORK GRAND
070300303, Ringgold, IA
Built 1967 Load: 22.3 t ADT: 120
DOGWOOD
Structurally DeficientOver: DRAINAGE DITCH
099223402, Worth, IA
Built 1972 Load: 22.3 t ADT: 236
LOCAL
Structurally DeficientOver: STREAM
097142201, Chickasaw, IA
Built 1962 Load: 22.5 t ADT: 51
LOCAL ROAD
Structurally DeficientOver: HEATHER BRANCH
071061502, Henry, IA
Built 1973 Load: 22.5 t ADT: 628
LOCAL
Structurally DeficientOver: GRAND RIVER
075300601, Adair, IA
Built 1958 Load: 22.7 t ADT: 15
LCL SLEEP H. RD
Structurally DeficientOver: CREEK
093390204, Cherokee, IA
Built 1971 Load: 22.7 t ADT: 15
FM
Structurally DeficientOver: CREEK
099360203, Dickinson, IA
Built 1941 Load: 22.7 t ADT: 2,060
Showing 20,601-20,650 of 20,753 bridges
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges Editorial.
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). A "structurally deficient" rating is a repair-priority signal, not a closure or unsafe-to-cross designation. Consult a qualified civil engineer before making decisions based on this data.
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.
| Publisher | Kiznis Studio |
| Sources | FHWA National Bridge Inventory, public U.S. government datasets |