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: S RACCOON RIVER
079312302, Guthrie, IA
Built 1959 Load: 11.6 t ADT: 20
PINE AVE
Structurally DeficientOver: S BR TURKEY RIVER
098121502, Howard, IA
Built 1957 Load: 11.6 t ADT: 40
LOCAL ROAD
Structurally DeficientOver: LITTLE OTTER CREEK
098433502, Lyon, IA
Built 1900 Load: 11.6 t ADT: 26
LOCAL
Structurally DeficientOver: LITTLE SOAP CREEK
071142002, Wapello, IA
Built 1930 Load: 11.6 t ADT: 30
LOCAL
Structurally DeficientOver: MIDDLE AVERY CREEK
072150603, Wapello, IA
Built 1972 Load: 11.6 t ADT: 73
LOCAL
Structurally DeficientOver: STREAM
087420502, Woodbury, IA
Built 1940 Load: 11.6 t ADT: 15
LOCAL 40TH ST
Structurally DeficientOver: BEAVER CREEK
090202601, Franklin, IA
Built 1954 Load: 11.7 t ADT: 35
BURLINGHAM RD
Structurally DeficientOver: BUFFALO CR
085051401, Linn, IA
Built 1900 Load: 11.7 t ADT: 50
LCL-RAINS AV
Structurally DeficientOver: HUNTER BRANCH
071403401, Mills, IA
Built 1950 Load: 11.7 t ADT: 15
LOCAL ROAD
Structurally DeficientOver: IOWA RIVER
092242303, Wright, IA
Built 1930 Load: 11.7 t ADT: 21
LOCAL
Structurally DeficientOver: PRAIRIE CREEK
082110701, Benton, IA
Built 1974 Load: 11.8 t ADT: 15
FM - 730TH
Structurally DeficientOver: ELM CREEK
074340802, Cass, IA
Built 1956 Load: 11.8 t ADT: 45
LOCAL
Structurally DeficientOver: DAVISONS CREEK
083172504, Marshall, IA
Built 1951 Load: 11.8 t ADT: 21
LOCAL
Structurally DeficientOver: PLATTE BRANCH
067321901, Taylor, IA
Built 1900 Load: 11.8 t ADT: 15
LOCAL
Structurally DeficientOver: SMALL STREAM
080112002, Iowa, IA
Built 1982 Load: 11.9 t ADT: 80
LOCAL
Structurally DeficientOver: JONES CREEK
075272906, Madison, IA
Built 1974 Load: 11.9 t ADT: 29
LOCAL
Structurally DeficientOver: W CEDAR CR.
088313001, Calhoun, IA
Built 1900 Load: 12.0 t ADT: 5
LOCAL
Structurally DeficientOver: CREEK
096163004, Floyd, IA
Built 1980 Load: 12.0 t ADT: 29
FM
Structurally DeficientOver: SMALL STREAM
078312704, Guthrie, IA
Built 1954 Load: 12.0 t ADT: 89
LOCAL
Structurally DeficientOver: STREAM
080320601, Guthrie, IA
Built 1951 Load: 12.0 t ADT: 11
LOCAL
Structurally DeficientOver: CAVITT CREEK
076240203, Warren, IA
Built 1967 Load: 12.0 t ADT: 176
FM
Structurally DeficientOver: SHORT CREEK
070263206, Decatur, IA
Built 1929 Load: 12.1 t ADT: 15
LOC CANAL ST
Structurally DeficientOver: WILLOW RIVER
078442103, Harrison, IA
Built 1916 Load: 12.1 t ADT: 100
302ND STREET
Structurally DeficientOver: WEST MILL CREEK
067382405, Page, IA
Built 1930 Load: 12.1 t ADT: 15
LOCAL
Structurally DeficientOver: STREAM
078150502, Poweshiek, IA
Built 1957 Load: 12.1 t ADT: 30
LOCAL
Structurally DeficientOver: STREAM
079153202, Poweshiek, IA
Built 1965 Load: 12.1 t ADT: 26
LOCAL
Structurally DeficientOver: LITTLE RIVER
068252905, Decatur, IA
Built 1980 Load: 12.2 t ADT: 30
LOCAL
Structurally DeficientOver: STREAM
080311902, Guthrie, IA
Built 1959 Load: 12.2 t ADT: 29
LOCAL
Structurally DeficientOver: BRANCH DEVIL'S RUN
079112802, Iowa, IA
Built 1963 Load: 12.2 t ADT: 26
265TH AVE
Structurally DeficientOver: CREEK
068052604, Lee, IA
Built 1934 Load: 12.2 t ADT: 90
LOCAL
Structurally DeficientOver: HONEY CR
069322202, Taylor, IA
Built 1965 Load: 12.2 t ADT: 29
LOCAL
Structurally DeficientOver: DRAINAGE DITCH
100231602, Winnebago, IA
Built 1966 Load: 12.2 t ADT: 41
CATTLE CREEK RD
Structurally DeficientOver: CREEK
099101201, Winneshiek, IA
Built 1900 Load: 12.2 t ADT: 20
GLACIER RD
Structurally DeficientOver: STREAM
091041704, Clayton, IA
Built 1925 Load: 12.3 t ADT: 79
LOCAL
Structurally DeficientOver: BR NORTH CEDAR CREEK
072201001, Lucas, IA
Built 1951 Load: 12.3 t ADT: 26
LOCAL
Structurally DeficientOver: WILDCAT CREEK
069101905, Van Buren, IA
Built 1951 Load: 12.3 t ADT: 30
FM
Structurally DeficientOver: WEST FORK LITTLE SIOUX
089441001, Woodbury, IA
Built 1960 Load: 12.3 t ADT: 509
LOCAL
Structurally DeficientOver: BIG CREEK
082252701, Boone, IA
Built 1917 Load: 12.4 t ADT: 30
LOCAL
Structurally DeficientOver: CREEK
071193204, Monroe, IA
Built 1959 Load: 12.4 t ADT: 40
FM
Structurally DeficientOver: STREAM
078132801, Poweshiek, IA
Built 1969 Load: 12.4 t ADT: 25
LOCAL
Structurally DeficientOver: SMALL STREAM
089370501, Sac, IA
Built 1916 Load: 12.4 t ADT: 11
POPLAR AVENUE
Structurally DeficientOver: WILLOW CREEK
071332304, Adams, IA
Built 1981 Load: 12.5 t ADT: 11
FM
Structurally DeficientOver: WEST BRANCH 102 RIVER
070342201, Taylor, IA
Built 1936 Load: 12.5 t ADT: 309
LOCAL
Structurally DeficientOver: LITTLE SOAP CREEK
071133304, Wapello, IA
Built 1914 Load: 12.5 t ADT: 11
KENDALL TRAIL
Structurally DeficientOver: STEER CREEK
080441207, Harrison, IA
Built 1969 Load: 12.6 t ADT: 5
LOCAL
Structurally DeficientOver: BITTER CREEK
089411406, Ida, IA
Built 1960 Load: 12.6 t ADT: 30
LCL-380TH ST
Structurally DeficientOver: DEER CREEK
071400904, Mills, IA
Built 1977 Load: 12.6 t ADT: 5
FM
Structurally DeficientOver: LITTLE TARKIO TRIB
071370701, Montgomery, IA
Built 1964 Load: 12.6 t ADT: 89
LOCAL ROAD
Structurally DeficientOver: MUD CREEK
078222706, Polk, IA
Built 1913 Load: 12.6 t ADT: 79
MISSOURI TAYLOR ST
Structurally DeficientOver: CREEK
067343403, Taylor, IA
Built 1900 Load: 12.6 t ADT: 5
Showing 20,251-20,300 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 |