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
OAKWOOD ST
Structurally DeficientOver: WEST CREEK
073262903, Clarke, IA
Built 1952 ADT: 11
LOCAL
Structurally DeficientOver: SMALL CREEK
073272301, Clarke, IA
Built 1972 ADT: 15
LOCAL
Structurally DeficientOver: STREAM
073273103, Clarke, IA
Built 1900 ADT: 26
LOCAL
Structurally DeficientOver: SOUTH WEST CREEK
073253105, Clarke, IA
Built 1900 ADT: 11
LOCAL
Structurally DeficientOver: SMALL STREAM
073272903, Clarke, IA
Built 1900 ADT: 11
280TH AVE
Structurally DeficientOver: ELK CREEK
095353004, Clay, IA
Built 1917 ADT: 11
210TH AVE
Structurally DeficientOver: LITTLE SIOUX RIVER
096370102, Clay, IA
Built 1915 ADT: 62
235TH STREET
Structurally DeficientOver: WAPSIPINICON RIVER
081E11105, Clinton, IA
Built 1930 ADT: 100
235TH STREET
Structurally DeficientOver: BRANCH OF WAPSIPINICON
081E11203, Clinton, IA
Built 1930 ADT: 100
LOCAL
Structurally DeficientOver: MILLER CREEK
084373004, Crawford, IA
Built 1981 ADT: 58
LOCAL
Structurally DeficientOver: NORTH RACCOON RIVER
A21600635, Dallas, IA
Built 1882 ADT: 153
COUNTY ROAD
Structurally DeficientOver: MOSQUITO CREEK
079290805, Dallas, IA
Built 1900 ADT: 21
LOCAL
Structurally DeficientOver: BEAVER CREEK
081263404, Dallas, IA
Built 1890 ADT: 21
COUNTY ROAD
Structurally DeficientOver: FROG CREEK
081281608, Dallas, IA
Built 1937 ADT: 35
LOCAL
Structurally DeficientOver: TRIB FOX RIVER
068120901, Davis, IA
Built 1959 ADT: 50
LOCAL
Structurally DeficientOver: S CHEQUEST LAKE CREEK
069121212, Davis, IA
Built 1963 ADT: 26
LOCAL
Structurally DeficientOver: LICK BRANCH OF WELDON R
067240501, Decatur, IA
Built 1958 ADT: 26
LOCAL
Structurally DeficientOver: DICKENSON BRANCH
067261202, Decatur, IA
Built 1949 ADT: 62
LOCAL
Structurally DeficientOver: LITTLE RIVER
068251904, Decatur, IA
Built 1943 ADT: 72
LOCAL
Structurally DeficientOver: ELK CREEK
068260703, Decatur, IA
Built 1921 ADT: 15
FM
Structurally DeficientOver: STREAM
068261603, Decatur, IA
Built 1968 ADT: 20
LOCAL
Structurally DeficientOver: W FORK BIG CREEK
068271901, Decatur, IA
Built 1929 ADT: 15
FM
Structurally DeficientOver: JONATHAN CREEK
069250103, Decatur, IA
Built 1920 ADT: 29
LOCAL
Structurally DeficientOver: CREEK
069263007, Decatur, IA
Built 1958 ADT: 11
LOCAL
Structurally DeficientOver: WELDON CREEK
070240706, Decatur, IA
Built 1916 ADT: 26
FM
Structurally DeficientOver: BEE CREEK
070260905, Decatur, IA
Built 1957 ADT: 29
FM
Structurally DeficientOver: STREAM
070262804, Decatur, IA
Built 1962 ADT: 79
LOCAL
Structurally DeficientOver: STREAM
070270903, Decatur, IA
Built 1967 ADT: 11
HAWKEYE RD
Structurally DeficientOver: HAWKEYE CREEK
0720214, Des Moines, IA
Built 1910 ADT: 11
EXP. DISP. AREA RD
Structurally DeficientOver: SPRING CREEK
APPROX 5000' E. OF RD. H, Des Moines, IA
Built 1940 ADT: 5
LOCAL
Structurally DeficientOver: STONY CREEK
098381602, Dickinson, IA
Built 1946 ADT: 11
LOCAL
Structurally DeficientOver: LITTLE SIOUX
099372001, Dickinson, IA
Built 1920 ADT: 31
LOCAL
Structurally DeficientOver: GRANGER CREEK
088E30611, Dubuque, IA
Built 1925 ADT: 45
LOCAL
Structurally DeficientOver: JOHN'S CREEK
088023502, Dubuque, IA
Built 1938 ADT: 26
ENTRANCE
Structurally DeficientOver: SIDE DITCH BRIDGE
087021601, Dubuque, IA
Built 1912 ADT: 10
473RD AVE
Structurally DeficientOver: JACK CREEK
099322904, Emmet, IA
Built 1906 ADT: 11
LOCAL
Structurally DeficientOver: E FORK OF DES MOINES
100322404, Emmet, IA
Built 1895 ADT: 5
ROSE RD.
Structurally DeficientOver: OTTER CR
091091803, Fayette, IA
Built 1956 ADT: 15
LOCAL
Structurally DeficientOver: LITTLE CEDAR
096150503, Floyd, IA
Built 1900 ADT: 26
LOCAL
Structurally DeficientOver: LITTLE CEDAR OVERFLOW
096150503, Floyd, IA
Built 1939 ADT: 26
LOCAL OLIVE AVE
Structurally DeficientOver: DRAINAGE DITCH NO 13
090202802, Franklin, IA
Built 1950 ADT: 21
INDIGO AVE
Structurally DeficientOver: DRAINAGE DITCH NO 6
090210902, Franklin, IA
Built 1957 ADT: 11
WRIGHT AVE
Structurally DeficientOver: DRAINAGE DITCH
090223102, Franklin, IA
Built 1967 ADT: 21
175TH STREET
Structurally DeficientOver: SMALL STREAM
092201303, Franklin, IA
Built 1968 ADT: 35
LOCAL ROAD
Structurally DeficientOver: DOWD CREEK
086181601, Grundy, IA
Built 1977 ADT: 15
LOCAL
Structurally DeficientOver: BRANCH BLACKHAWK CREEK
087170303, Grundy, IA
Built 1955 ADT: 33
FM
Structurally DeficientOver: BLACKHAWK CREEK ,BRANCH
087171302, Grundy, IA
Built 1965 ADT: 275
LOCAL ROAD
Structurally DeficientOver: BRANCH OF WOLF CREEK
087173502, Grundy, IA
Built 1953 ADT: 15
LOCAL
Structurally DeficientOver: BRANCH OF BLACKHAWK CRK
088173102, Grundy, IA
Built 1976 ADT: 71
FM
Structurally DeficientOver: BRANCH BEAVER CREEK
089150302, Grundy, IA
Built 1968 ADT: 619
Showing 19,451-19,500 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 |