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
LOCAL
Structurally DeficientOver: JORDAN CREEK
070212605, Wayne, IA
Built 1979 Load: 13.7 t ADT: 20
FM
Structurally DeficientOver: STREAM
068171303, Appanoose, IA
Built 1958 Load: 13.8 t ADT: 50
LOCAL
Structurally DeficientOver: SMALL STREAM
078311605, Guthrie, IA
Built 1945 Load: 13.8 t ADT: 11
LOCAL
Structurally DeficientOver: SMALL STREAM
080120501, Iowa, IA
Built 1977 Load: 13.8 t ADT: 30
LOCAL
Structurally DeficientOver: STREAM
070302803, Ringgold, IA
Built 1936 Load: 13.8 t ADT: 5
LOCAL
Structurally DeficientOver: SOLDIER CR
100323501, Emmet, IA
Built 1964 Load: 13.9 t ADT: 26
FM
Structurally DeficientOver: DRAINAGE
076291002, Madison, IA
Built 1949 Load: 13.9 t ADT: 597
FM
Structurally DeficientOver: BNSF RR
072160701, Monroe, IA
Built 1936 Load: 13.9 t ADT: 360
COUNTY ROAD
Structurally DeficientOver: BR TARKIO CREEK
072370205, Montgomery, IA
Built 1956 Load: 13.9 t ADT: 11
LOCAL
Structurally DeficientOver: WOLF CREEK
069311205, Ringgold, IA
Built 1940 Load: 13.9 t ADT: 20
FM- Y AVE
Structurally DeficientOver: LITTLE MAPLE RIVER
090392502, Cherokee, IA
Built 1971 Load: 14.0 t ADT: 439
LOCAL
Structurally DeficientOver: SOAP CREEK
070140204, Davis, IA
Built 1920 Load: 14.0 t ADT: 110
LOCAL
Structurally DeficientOver: STREAM
067282203, Ringgold, IA
Built 1949 Load: 14.0 t ADT: 5
LOCAL
Structurally DeficientOver: BR LITTLE SIOUX RIVER
093382302, Buena Vista, IA
Built 1921 Load: 14.1 t ADT: 11
AUSTIN AVE
Structurally DeficientOver: STREAM
080451306, Harrison, IA
Built 1936 Load: 14.1 t ADT: 488
E 84TH ST S
Structurally DeficientOver: PRAIRIE CREEK
079181502, Jasper, IA
Built 1948 Load: 14.1 t ADT: 73
LOCAL SECONDARY
Structurally DeficientOver: WEST BRANCH SUGAR CREEK
069062903, Lee, IA
Built 1934 Load: 14.1 t ADT: 30
LOCAL
Structurally DeficientOver: BEAVER CK
093311802, Pocahontas, IA
Built 1973 Load: 14.1 t ADT: 5
LOCAL
Structurally DeficientOver: WOLF CREEK
083132101, Tama, IA
Built 1940 Load: 14.1 t ADT: 20
LOCAL
Structurally DeficientOver: STREAM
073280202, Union, IA
Built 1900 Load: 14.1 t ADT: 51
FM-GINKO AVENUE
Structurally DeficientOver: KEMP CREEK
072343104, Adams, IA
Built 1976 Load: 14.2 t ADT: 60
LOCAL
Structurally DeficientOver: WEST CREEK
073262207, Clarke, IA
Built 1976 Load: 14.2 t ADT: 11
190TH STREET
Structurally DeficientOver: SMALL STREAM
069381901, Page, IA
Built 1963 Load: 14.2 t ADT: 79
MARSH AVE
Structurally DeficientOver: STREAM
093163002, Butler, IA
Built 1945 Load: 14.3 t ADT: 29
LOCAL
Structurally DeficientOver: SMALL
088152102, Grundy, IA
Built 1978 Load: 14.3 t ADT: 11
LOCAL
Structurally DeficientOver: SMALL STREAM
080210306, Jasper, IA
Built 1924 Load: 14.3 t ADT: 361
FM
Structurally DeficientOver: JONES CREEK
075272404, Madison, IA
Built 1953 Load: 14.3 t ADT: 60
FM
Structurally DeficientOver: BR BADGER CREEK
077261401, Madison, IA
Built 1970 Load: 14.3 t ADT: 1,714
FM
Structurally DeficientOver: D D #66 BR SO LIZARD CK
090331101, Pocahontas, IA
Built 1970 Load: 14.3 t ADT: 45
LOCAL
Structurally DeficientOver: BRANCH IOWA RIVER
083150403, Tama, IA
Built 1913 Load: 14.3 t ADT: 33
FERRIS MILL RD
Structurally DeficientOver: CREEK
099072403, Winneshiek, IA
Built 1900 Load: 14.3 t ADT: 70
LOCAL
Structurally DeficientOver: DD #107
093251701, Wright, IA
Built 1972 Load: 14.3 t ADT: 21
LOCAL
Structurally DeficientOver: CREEK
094132704, Chickasaw, IA
Built 1963 Load: 14.4 t ADT: 16
LOCAL
Structurally DeficientOver: DRAINAGE
073373403, Montgomery, IA
Built 1969 Load: 14.4 t ADT: 5
LOCAL
Structurally DeficientOver: SMALL
079130702, Poweshiek, IA
Built 1979 Load: 14.4 t ADT: 11
LOCAL
Structurally DeficientOver: SMALL STREAM
089360903, Sac, IA
Built 1953 Load: 14.4 t ADT: 11
FM
Structurally DeficientOver: WEST ELK CREEK
069273003, Decatur, IA
Built 1961 Load: 14.5 t ADT: 20
FM
Structurally DeficientOver: TIMBER CREEK
083170804, Marshall, IA
Built 1945 Load: 14.5 t ADT: 59
CONCORD AVE
Structurally DeficientOver: UNNAMED CREEK
092481602, Plymouth, IA
Built 1949 Load: 14.5 t ADT: 11
LOCAL
Structurally DeficientOver: STREAM
081151401, Poweshiek, IA
Built 1980 Load: 14.5 t ADT: 20
FM
Structurally DeficientOver: DD #71
087360701, Sac, IA
Built 1920 Load: 14.5 t ADT: 20
LOCAL
Structurally DeficientOver: WILD CAT CREEK
084090803, Benton, IA
Built 1900 Load: 14.6 t ADT: 39
LOCAL
Structurally DeficientOver: PRAIRIE CK
085100204, Benton, IA
Built 1971 Load: 14.6 t ADT: 90
S 104TH AVE E
Structurally DeficientOver: SMALL STREAM
078181903, Jasper, IA
Built 1978 Load: 14.6 t ADT: 30
LOCAL
Structurally DeficientOver: CREEK
071192003, Monroe, IA
Built 1970 Load: 14.6 t ADT: 40
FM
Structurally DeficientOver: CREEK
070100804, Van Buren, IA
Built 1977 Load: 14.6 t ADT: 40
LOCAL
Structurally DeficientOver: STREAM
080320902, Guthrie, IA
Built 1940 Load: 14.7 t ADT: 5
LOCAL
Structurally DeficientOver: S COAL CREEK
074171201, Mahaska, IA
Built 1951 Load: 14.7 t ADT: 80
LOCAL
Structurally DeficientOver: DD 63
094330601, Palo Alto, IA
Built 1958 Load: 14.7 t ADT: 15
FM
Structurally DeficientOver: CEDAR RIVER
086100603, Benton, IA
Built 1968 Load: 14.8 t ADT: 324
Showing 20,351-20,400 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 |