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: STREAM
078323604, Guthrie, IA
Built 1970 Load: 5.3 t ADT: 11
LOCAL
Structurally DeficientOver: DRAINAGE
077172807, Mahaska, IA
Built 1957 Load: 5.3 t ADT: 71
LOCAL
Structurally DeficientOver: DRAINAGE
073390301, Montgomery, IA
Built 1945 Load: 5.3 t ADT: 5
LOCAL
Structurally DeficientOver: TURKEY CR
068232704, Wayne, IA
Built 1967 Load: 5.3 t ADT: 15
LOCAL
Structurally DeficientOver: DAVIDS CREEK
079341901, Audubon, IA
Built 1964 Load: 5.4 t ADT: 30
LOCAL
Structurally DeficientOver: RACCOON RIVER
090360101, Buena Vista, IA
Built 1914 Load: 5.4 t ADT: 26
FIELD ENTRANCE
Structurally DeficientOver: SIDE DITCH
070263205, Decatur, IA
Built 1963 Load: 5.4 t ADT: 10
LOCAL
Structurally DeficientOver: SHORT CREEK
070271308, Decatur, IA
Built 1967 Load: 5.4 t ADT: 30
1870 CRANE AVE
Structurally DeficientOver: BOONE RIVER
095262106, Hancock, IA
Built 1925 Load: 5.4 t ADT: 36
155TH ST
Structurally DeficientOver: WILLOW RIVER
081423203, Harrison, IA
Built 1930 Load: 5.4 t ADT: 11
NE 340TH ST
Structurally DeficientOver: SMALL
079050107, Johnson, IA
Built 1900 Load: 5.4 t ADT: 11
LOCAL
Structurally DeficientOver: CREEK
071192406, Monroe, IA
Built 1939 Load: 5.4 t ADT: 34
FM
Structurally DeficientOver: BRANCH COAL CREEK
075220801, Warren, IA
Built 1955 Load: 5.4 t ADT: 50
LOCAL
Structurally DeficientOver: SMALL STREAM
091160501, Butler, IA
Built 1963 Load: 5.5 t ADT: 25
FM
Structurally DeficientOver: SMALL CREEK
079302906, Guthrie, IA
Built 1957 Load: 5.5 t ADT: 79
S 54TH AVE W
Structurally DeficientOver: SEWER CREEK
079192105, Jasper, IA
Built 1931 Load: 5.5 t ADT: 11
FM
Structurally DeficientOver: MONK CREEK
066070205, Lee, IA
Built 1934 Load: 5.5 t ADT: 90
ELMTREE ROAD
Structurally DeficientOver: SILVER CREEK
075412604, Pottawattamie, IA
Built 1961 Load: 5.5 t ADT: 29
LOCAL
Structurally DeficientOver: SMALL
078162703, Poweshiek, IA
Built 1983 Load: 5.5 t ADT: 26
LOCAL
Structurally DeficientOver: E FK GRAND RIVER
069292401, Ringgold, IA
Built 1970 Load: 5.5 t ADT: 15
LOCAL
Structurally DeficientOver: CREEK
069330502, Taylor, IA
Built 1960 Load: 5.5 t ADT: 45
LOCAL
Structurally DeficientOver: SMALL
093233106, Wright, IA
Built 1973 Load: 5.5 t ADT: 275
LOCAL
Structurally DeficientOver: BEAVER CREEK
090182802, Butler, IA
Built 1950 Load: 5.6 t ADT: 39
470TH ST
Structurally DeficientOver: LITTLE SIOUX RIVER
094360906, Clay, IA
Built 1907 Load: 5.6 t ADT: 26
180TH ST
Structurally DeficientOver: BOHEMIAN CREEK
097110301, Howard, IA
Built 1953 Load: 5.6 t ADT: 42
LOCAL
Structurally DeficientOver: STREAM
068201103, Wayne, IA
Built 1900 Load: 5.6 t ADT: 5
LOCAL
Structurally DeficientOver: BLUFF CREEK
084270904, Boone, IA
Built 1900 Load: 5.7 t ADT: 20
LOCAL
Structurally DeficientOver: SMALL STREAM
091172202, Butler, IA
Built 1952 Load: 5.7 t ADT: 30
FM
Structurally DeficientOver: EAST SUGAR CREEK
080013001, Cedar, IA
Built 1914 Load: 5.7 t ADT: 20
325TH ST
Structurally DeficientOver: KEG CREEK
078412601, Harrison, IA
Built 1900 Load: 5.7 t ADT: 11
FM
Structurally DeficientOver: S COAL CREEK
074171004, Mahaska, IA
Built 1951 Load: 5.8 t ADT: 10
LOCAL 270TH ST
Structurally DeficientOver: WAPSIPICON RVR OVERFLOW
091113301, Bremer, IA
Built 1965 Load: 5.9 t ADT: 11
FM
Structurally DeficientOver: LITTLE BEAR CREEK
080122702, Iowa, IA
Built 1970 Load: 5.9 t ADT: 80
S 54TH AVE E
Structurally DeficientOver: ELK CREEK
079182103, Jasper, IA
Built 1976 Load: 5.9 t ADT: 48
LOCAL ROAD
Structurally DeficientOver: OVERFLOW
098433502, Lyon, IA
Built 1900 Load: 5.9 t ADT: 26
SIDE DITCH ENT
Structurally DeficientOver: SIDE DITCH
098471002, Lyon, IA
Built 1900 Load: 5.9 t ADT: 10
LOCAL RD
Structurally DeficientOver: BR TO MIDDLE
075290704, Madison, IA
Built 1942 Load: 5.9 t ADT: 50
FM
Structurally DeficientOver: LITTLE TARKIO TRIB
072373004, Montgomery, IA
Built 1947 Load: 5.9 t ADT: 29
IDELWOOD ROAD
Structurally DeficientOver: WALNUT CREEK
075380301, Pottawattamie, IA
Built 1977 Load: 5.9 t ADT: 11
LOCAL
Structurally DeficientOver: STREAM
068282701, Ringgold, IA
Built 1946 Load: 5.9 t ADT: 5
LOCAL
Structurally DeficientOver: SMALL STREAM
071261705, Clarke, IA
Built 1900 Load: 6.0 t ADT: 11
LCL-JARRED AVE
Structurally DeficientOver: CREEK
072402405, Mills, IA
Built 1940 Load: 6.0 t ADT: 15
LOCAL
Structurally DeficientOver: LITTLE CEDAR
096151608, Floyd, IA
Built 1912 Load: 6.1 t ADT: 44
LOCAL
Structurally DeficientOver: NORTH ENGLISH RIVER
079113204, Iowa, IA
Built 1929 Load: 6.1 t ADT: 20
FM
Structurally DeficientOver: SMALL
079123003, Iowa, IA
Built 1952 Load: 6.1 t ADT: 45
LOCAL ROAD
Structurally DeficientOver: SMALL STREAM
098482304, Lyon, IA
Built 1900 Load: 6.1 t ADT: 21
LOCAL ROAD
Structurally DeficientOver: PAINTER CREEK
075252002, Warren, IA
Built 1958 Load: 6.1 t ADT: 35
120TH ST
Structurally DeficientOver: W BR FLOYD RIVER
093451803, Plymouth, IA
Built 1941 Load: 6.2 t ADT: 20
LOCAL
Structurally DeficientOver: SO ENGLISH RIVER
078143401, Poweshiek, IA
Built 1980 Load: 6.2 t ADT: 50
207TH AVE
Structurally DeficientOver: STREAM
067262308, Decatur, IA
Built 1977 Load: 6.3 t ADT: 21
Showing 19,951-20,000 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 |