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: SHAIN CREEK
067270401, Decatur, IA
Built 1991 Load: 6.3 t ADT: 35
LOCAL
Structurally DeficientOver: STREAM
081312802, Guthrie, IA
Built 1957 Load: 6.3 t ADT: 34
RENO AVE
Structurally DeficientOver: SIX MILE CREEK
079421204, Harrison, IA
Built 1930 Load: 6.3 t ADT: 11
S 36TH AVE E
Structurally DeficientOver: SUGAR CREEK
079171203, Jasper, IA
Built 1979 Load: 6.3 t ADT: 21
ROSEDALE RD
Structurally DeficientOver: INDIAN CR
083062002, Linn, IA
Built 1890 Load: 6.3 t ADT: 299
LCL-ELLINGTON
Structurally DeficientOver: KEG CREEK
073423103, Mills, IA
Built 1964 Load: 6.3 t ADT: 41
LOCAL
Structurally DeficientOver: BIG INDIAN CREEK
068100705, Van Buren, IA
Built 1960 Load: 6.3 t ADT: 21
LOCAL
Structurally DeficientOver: STREAM
068293403, Ringgold, IA
Built 1916 Load: 6.4 t ADT: 15
355TH ST
Structurally DeficientOver: LITTLE SIOUX RIVER
096371106, Clay, IA
Built 1905 Load: 6.5 t ADT: 41
35TH AVE
Structurally DeficientOver: CREEK
080E12204, Scott, IA
Built 1965 Load: 6.5 t ADT: 51
FM
Structurally DeficientOver: DRAINAGE DITCH
099252902, Winnebago, IA
Built 1955 Load: 6.5 t ADT: 34
LOCAL
Structurally DeficientOver: HONEY CREEK
087222203, Hardin, IA
Built 1988 Load: 6.6 t ADT: 30
LOCAL
Structurally DeficientOver: STREAM
067292401, Ringgold, IA
Built 1959 Load: 6.6 t ADT: 11
LOCAL
Structurally DeficientOver: CREEK
068083003, Van Buren, IA
Built 1959 Load: 6.6 t ADT: 11
LOCAL ROAD
Structurally DeficientOver: UPPER IOWA RIVER
100101803, Winneshiek, IA
Built 1904 Load: 6.7 t ADT: 20
LOCAL
Structurally DeficientOver: MCELHANEY CREEK
089442702, Woodbury, IA
Built 1960 Load: 6.7 t ADT: 40
LOC RD CLASS B
Structurally DeficientOver: STREAM
076101804, Keokuk, IA
Built 1970 Load: 6.8 t ADT: 11
150TH STREET
Structurally DeficientOver: STREAM
070373601, Page, IA
Built 1941 Load: 6.8 t ADT: 26
LOCAL
Structurally DeficientOver: M FK GRAND RIVER
067300901, Ringgold, IA
Built 1981 Load: 6.8 t ADT: 20
LOCAL
Structurally DeficientOver: WALKER CREEK
070202202, Wayne, IA
Built 1983 Load: 6.8 t ADT: 30
LOCAL
Structurally DeficientOver: BUCK BRANCH
070183606, Appanoose, IA
Built 1954 Load: 6.9 t ADT: 16
LOCAL
Structurally DeficientOver: DRAINAGE DITCH
089230701, Hamilton, IA
Built 1975 Load: 6.9 t ADT: 15
LOCAL
Structurally DeficientOver: DRAINAGE
072373401, Montgomery, IA
Built 1966 Load: 6.9 t ADT: 11
LOCAL
Structurally DeficientOver: SAND CREEK
070281503, Ringgold, IA
Built 1958 Load: 6.9 t ADT: 15
GRANITE AVE
Structurally DeficientOver: BROKEN KETTLE CREEK
093473402, Plymouth, IA
Built 1900 Load: 7.0 t ADT: 34
LOCAL
Structurally DeficientOver: MALONE CR
089092405, Buchanan, IA
Built 1925 Load: 7.1 t ADT: 20
LOCAL
Structurally DeficientOver: BR CARRUTHERS CREEK
073201104, Lucas, IA
Built 1956 Load: 7.1 t ADT: 11
LOCAL
Structurally DeficientOver: NORTH ENGLISH RIVER
079142004, Poweshiek, IA
Built 1951 Load: 7.1 t ADT: 20
LOCAL
Structurally DeficientOver: ELKHORN CREEK
078371603, Shelby, IA
Built 1958 Load: 7.1 t ADT: 21
LOCAL
Structurally DeficientOver: W FORK NODAWAY RIVER
074331603, Adair, IA
Built 1949 Load: 7.2 t ADT: 30
LOCAL
Structurally DeficientOver: SMALL STREAM
091162903, Butler, IA
Built 1970 Load: 7.2 t ADT: 11
LOCAL - 740TH
Structurally DeficientOver: CREEK
076343302, Cass, IA
Built 1900 Load: 7.2 t ADT: 26
LCL-QUEEN AVE
Structurally DeficientOver: DEER CREEK
071403003, Mills, IA
Built 1940 Load: 7.2 t ADT: 15
FM
Structurally DeficientOver: GRAYS CREEK
073172402, Monroe, IA
Built 1951 Load: 7.2 t ADT: 45
LOCAL
Structurally DeficientOver: DRAINAGE
073192507, Monroe, IA
Built 1952 Load: 7.2 t ADT: 50
FM
Structurally DeficientOver: E FORK GRAND RIVER
068292704, Ringgold, IA
Built 1959 Load: 7.2 t ADT: 20
LOCAL
Structurally DeficientOver: KEG CREEK
079403503, Shelby, IA
Built 1969 Load: 7.2 t ADT: 11
LOCAL
Structurally DeficientOver: STREAM
068352505, Taylor, IA
Built 1955 Load: 7.2 t ADT: 26
LOCAL
Structurally DeficientOver: STREAM
068180303, Appanoose, IA
Built 1948 Load: 7.3 t ADT: 35
FM
Structurally DeficientOver: MUD CREEK
084111201, Benton, IA
Built 1951 Load: 7.3 t ADT: 15
FM
Structurally DeficientOver: WEST FORK CEDAR RIVER
090151102, Butler, IA
Built 1920 Load: 7.3 t ADT: 79
LOCAL ROAD
Structurally DeficientOver: BRANCH BLACK HAWK CREEK
087160403, Grundy, IA
Built 1971 Load: 7.3 t ADT: 33
FM
Structurally DeficientOver: BITTER CREEK
089411504, Ida, IA
Built 1957 Load: 7.3 t ADT: 15
S 112TH AVE E
Structurally DeficientOver: SMALL STREAM
078183003, Jasper, IA
Built 1939 Load: 7.3 t ADT: 42
LOCAL
Structurally DeficientOver: NORTH WALNUT CREEK
081150201, Poweshiek, IA
Built 1951 Load: 7.3 t ADT: 34
LOC 220TH AVE
Structurally DeficientOver: LINDNER CREEK
097273402, Kossuth, IA
Built 1965 Load: 7.4 t ADT: 82
LCL-PATHFIELD
Structurally DeficientOver: WAUBONSIE CR
071421803, Mills, IA
Built 1940 Load: 7.4 t ADT: 20
220TH STREET
Structurally DeficientOver: SNAKE CREEK
068380203, Page, IA
Built 1980 Load: 7.4 t ADT: 20
LOCAL
Structurally DeficientOver: DRAINAGE DITCH
089202101, Hardin, IA
Built 1978 Load: 7.5 t ADT: 73
WALNUT AVENUE
Structurally DeficientOver: CIPRA BRANCH
072321101, Adams, IA
Built 1955 Load: 7.6 t ADT: 15
Showing 20,001-20,050 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 |