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
2990 BIRCH AVE
Structurally DeficientOver: LINDSEY CREEK
097262902, Hancock, IA
Built 1963 Load: 9.6 t ADT: 35
FM - HIGHLAND
Structurally DeficientOver: INDIAN CREEK
076370801, Cass, IA
Built 1959 Load: 9.8 t ADT: 278
YANKEE AVE
Structurally DeficientOver: PLUM CREEK
082012404, Cedar, IA
Built 1976 Load: 9.8 t ADT: 15
LOCAL
Structurally DeficientOver: BOYER RIVER
085370601, Crawford, IA
Built 1971 Load: 9.8 t ADT: 11
LOCAL
Structurally DeficientOver: SMALL STREAM
081330901, Guthrie, IA
Built 1987 Load: 9.8 t ADT: 15
FM 190TH AVE
Structurally DeficientOver: PLUM CREEK
096271802, Kossuth, IA
Built 1960 Load: 9.8 t ADT: 133
FM 380TH ST
Structurally DeficientOver: UNION SLOUGH DITCH
098281401, Kossuth, IA
Built 1964 Load: 9.8 t ADT: 180
LOCAL - 740TH
Structurally DeficientOver: WEST NODAWAY RIVER
075343302, Cass, IA
Built 1978 Load: 9.9 t ADT: 51
LOCAL 460TH ST
Structurally DeficientOver: SIOUX RIVER
093422501, Cherokee, IA
Built 1931 Load: 9.9 t ADT: 11
LOCAL
Structurally DeficientOver: BR OF OLD MANS CREEK
079101005, Iowa, IA
Built 1976 Load: 9.9 t ADT: 150
LOCAL
Structurally DeficientOver: SMALL STREAM
080120203, Iowa, IA
Built 1969 Load: 9.9 t ADT: 5
LOCAL
Structurally DeficientOver: BRUSH CREEK
082172202, Marshall, IA
Built 1917 Load: 9.9 t ADT: 47
FM
Structurally DeficientOver: NORTH RIVER
077253308, Warren, IA
Built 1949 Load: 9.9 t ADT: 89
LOCAL (LWC)
Structurally DeficientOver: WEASEL CREEK
082110101, Benton, IA
Built 1979 Load: 10.0 t ADT: 45
GREEN RD
Structurally DeficientOver: ROCK RUN CR
080030803, Cedar, IA
Built 1920 Load: 10.0 t ADT: 50
300TH ST
Structurally DeficientOver: MINERS CREEK
092031205, Clayton, IA
Built 1916 Load: 10.0 t ADT: 39
LOCAL ROAD
Structurally DeficientOver: BRANCH BLACK HAWK CREEK
088151802, Grundy, IA
Built 1971 Load: 10.0 t ADT: 29
FM
Structurally DeficientOver: BR TO WHITEBREAST CREEK
072222903, Lucas, IA
Built 1958 Load: 10.0 t ADT: 90
LOCAL
Structurally DeficientOver: N MINERVA CREEK
085201601, Marshall, IA
Built 1917 Load: 10.0 t ADT: 21
LOCAL
Structurally DeficientOver: SMALL STREAM
088362903, Sac, IA
Built 1949 Load: 10.0 t ADT: 20
LOCAL ROAD
Structurally DeficientOver: STREAM
071302701, Union, IA
Built 1900 Load: 10.0 t ADT: 26
LOCAL
Structurally DeficientOver: DRAINAGE DITCH #40
100323301, Emmet, IA
Built 1961 Load: 10.1 t ADT: 11
LOCAL
Structurally DeficientOver: CREEK
089413102, Ida, IA
Built 1900 Load: 10.1 t ADT: 26
LOCAL
Structurally DeficientOver: OLD MANS CREEK
079102703, Iowa, IA
Built 1967 Load: 10.1 t ADT: 26
FM
Structurally DeficientOver: MIDDLE RIVER
076262506, Madison, IA
Built 1932 Load: 10.1 t ADT: 450
LOCAL
Structurally DeficientOver: STREAM
069230602, Wayne, IA
Built 1975 Load: 10.1 t ADT: 5
RAIL AVE
Structurally DeficientOver: SMALL STREAM
091201404, Franklin, IA
Built 1952 Load: 10.2 t ADT: 29
LARK AVE
Structurally DeficientOver: MAYNES CR
091212402, Franklin, IA
Built 1956 Load: 10.2 t ADT: 30
LOCAL
Structurally DeficientOver: BRANCH BIG CREEK
072063613, Henry, IA
Built 1985 Load: 10.2 t ADT: 11
LOCAL
Structurally DeficientOver: CREEK
073113005, Jefferson, IA
Built 1959 Load: 10.2 t ADT: 60
LOCAL
Structurally DeficientOver: CREEK
085171402, Marshall, IA
Built 1956 Load: 10.2 t ADT: 16
EVERGREEN AVE
Structurally DeficientOver: INDIAN CREEK
093470702, Plymouth, IA
Built 1961 Load: 10.2 t ADT: 5
LOCAL ROAD
Structurally DeficientOver: INDIAN CREEK
081220203, Polk, IA
Built 1916 Load: 10.2 t ADT: 45
FM
Structurally DeficientOver: STREAM
067282801, Ringgold, IA
Built 1955 Load: 10.2 t ADT: 5
LOCAL
Structurally DeficientOver: UNNAMED STREAM
069301001, Ringgold, IA
Built 1957 Load: 10.2 t ADT: 20
LOCAL
Structurally DeficientOver: RICHLAND CREEK
082152404, Tama, IA
Built 1900 Load: 10.2 t ADT: 5
LOCAL
Structurally DeficientOver: PIKE RUN
099252401, Winnebago, IA
Built 1976 Load: 10.2 t ADT: 5
CREEK BRANCH LANE
Structurally DeficientOver: PRAIRIE CREEK
087E23105, Dubuque, IA
Built 1900 Load: 10.3 t ADT: 11
LOCAL
Structurally DeficientOver: CREEK
071191502, Monroe, IA
Built 1959 Load: 10.3 t ADT: 30
LOCAL
Structurally DeficientOver: STREAM
070293504, Ringgold, IA
Built 1988 Load: 10.3 t ADT: 20
7TH ST
Structurally DeficientOver: CEDAR RIVER
000000000, Black Hawk, IA
Built 1930 Load: 10.4 t ADT: 1,531
LOCAL
Structurally DeficientOver: BR RACCOON RIVER
092362704, Buena Vista, IA
Built 1928 Load: 10.4 t ADT: 11
LOCAL
Structurally DeficientOver: BURR OAK CREEK
069122203, Davis, IA
Built 1955 Load: 10.4 t ADT: 20
LOCAL
Structurally DeficientOver: TRIB TARKIO
072372804, Montgomery, IA
Built 1955 Load: 10.4 t ADT: 5
LOCAL
Structurally DeficientOver: BRANCH EAST PLATTE
071301905, Union, IA
Built 1978 Load: 10.4 t ADT: 11
LOCAL
Structurally DeficientOver: BRANCH DES MOINES RIVER
073152103, Wapello, IA
Built 1930 Load: 10.4 t ADT: 62
LOCAL
Structurally DeficientOver: MIDDLE RIVER
078322602, Guthrie, IA
Built 1930 Load: 10.5 t ADT: 60
LOCAL
Structurally DeficientOver: IOWAY CREEK
086253201, Hamilton, IA
Built 1917 Load: 10.5 t ADT: 45
1280 HILL AVE
Structurally DeficientOver: DD #159
094252002, Hancock, IA
Built 1969 Load: 10.5 t ADT: 31
LOCAL
Structurally DeficientOver: STREAM
076150601, Mahaska, IA
Built 1950 Load: 10.5 t ADT: 140
Showing 20,151-20,200 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 |