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: UNNAMED CREEK
086371502, Sac, IA
Built 1955 Load: 10.5 t ADT: 60
LOCAL
Structurally DeficientOver: SMALL
069350401, Taylor, IA
Built 1979 Load: 10.5 t ADT: 5
LOCAL
Structurally DeficientOver: CHARITON CR
071243004, Clarke, IA
Built 1960 Load: 10.6 t ADT: 15
TEMPLE AVE
Structurally DeficientOver: SMALL STREAM
078170303, Jasper, IA
Built 1974 Load: 10.6 t ADT: 80
LOCAL
Structurally DeficientOver: ENGLISH CREEK
073212401, Lucas, IA
Built 1954 Load: 10.6 t ADT: 11
LOCAL
Structurally DeficientOver: DRAINAGE
075141808, Mahaska, IA
Built 1960 Load: 10.6 t ADT: 60
LOCAL
Structurally DeficientOver: STREAM
067250603, Decatur, IA
Built 1966 Load: 10.7 t ADT: 11
LOCAL
Structurally DeficientOver: N LIZARD CREEK
093330901, Pocahontas, IA
Built 1916 Load: 10.7 t ADT: 11
LOCAL
Structurally DeficientOver: CREEK
067320304, Taylor, IA
Built 1961 Load: 10.7 t ADT: 5
LOCAL ROAD
Structurally DeficientOver: BRANCH OTTER CREEK
075230802, Warren, IA
Built 1970 Load: 10.7 t ADT: 288
LOCAL
Structurally DeficientOver: STREAM
067182304, Appanoose, IA
Built 1900 Load: 10.8 t ADT: 21
172ND ST
Structurally DeficientOver: STREAM
094050903, Clayton, IA
Built 1916 Load: 10.8 t ADT: 16
LOCAL
Structurally DeficientOver: STREAM
071302401, Union, IA
Built 1977 Load: 10.8 t ADT: 41
FM
Structurally DeficientOver: NORTH RIVER
077242002, Warren, IA
Built 1960 Load: 10.8 t ADT: 1,714
LOCAL
Structurally DeficientOver: FULTON TWP
088300302, Webster, IA
Built 1956 Load: 10.8 t ADT: 35
LOCAL
Structurally DeficientOver: STREAM
089431302, Woodbury, IA
Built 1940 Load: 10.8 t ADT: 15
LOCAL
Structurally DeficientOver: CHARITON CREEK
071242906, Clarke, IA
Built 1971 Load: 10.9 t ADT: 20
LOCAL
Structurally DeficientOver: DR TO HONEY CREEK
071222404, Lucas, IA
Built 1900 Load: 10.9 t ADT: 5
LOCAL
Structurally DeficientOver: CREEK
083190603, Marshall, IA
Built 1918 Load: 10.9 t ADT: 30
VALLEY AVE
Structurally DeficientOver: CREEK
098151502, Mitchell, IA
Built 1960 Load: 10.9 t ADT: 11
LOCAL
Structurally DeficientOver: SMALL STREAM
088363201, Sac, IA
Built 1900 Load: 10.9 t ADT: 26
E36
Structurally DeficientOver: SALT CREEK
084132203, Tama, IA
Built 1959 Load: 10.9 t ADT: 314
FM
Structurally DeficientOver: BUTCHER CREEK
077221904, Warren, IA
Built 1952 Load: 10.9 t ADT: 830
590TH ST
Structurally DeficientOver: MAPLE RIVER
091393201, Cherokee, IA
Built 1919 Load: 11.0 t ADT: 30
440TH ST
Structurally DeficientOver: CREEK
093391401, Cherokee, IA
Built 1931 Load: 11.0 t ADT: 11
LOCAL
Structurally DeficientOver: SMALL CREEK
096181912, Floyd, IA
Built 1916 Load: 11.0 t ADT: 78
250TH ST
Structurally DeficientOver: ALLEN CREEK
079442301, Harrison, IA
Built 1965 Load: 11.0 t ADT: 11
LOCAL
Structurally DeficientOver: STREAM
075212402, Marion, IA
Built 1925 Load: 11.0 t ADT: 16
150TH ST
Structurally DeficientOver: SKUNK RIVER
085233103, Story, IA
Built 1920 Load: 11.0 t ADT: 100
FM
Structurally DeficientOver: MUDDY CREEK
089450801, Woodbury, IA
Built 1967 Load: 11.0 t ADT: 628
LOCAL
Structurally DeficientOver: SMALL STREAM
092162504, Butler, IA
Built 1969 Load: 11.1 t ADT: 51
FM
Structurally DeficientOver: WELDON RIVER
069240401, Decatur, IA
Built 1957 Load: 11.1 t ADT: 421
LOCAL
Structurally DeficientOver: TRIB S FORK ENG RIVER
077111403, Keokuk, IA
Built 1951 Load: 11.1 t ADT: 26
LOCAL
Structurally DeficientOver: TRIB TO SPRING CREEK
073130501, Wapello, IA
Built 1950 Load: 11.1 t ADT: 5
E 132ND ST S
Structurally DeficientOver: SMALL STREAM
078170406, Jasper, IA
Built 1937 Load: 11.2 t ADT: 91
LOCAL
Structurally DeficientOver: BURR OAK CREEK
081183401, Jasper, IA
Built 1950 Load: 11.2 t ADT: 30
LOCAL
Structurally DeficientOver: DRAINAGE
073171906, Monroe, IA
Built 1948 Load: 11.2 t ADT: 20
FIELD ENTRANCE
Structurally DeficientOver: DRAINAGE (SDB)
070391402, Page, IA
Built 1900 Load: 11.2 t ADT: 10
FM
Structurally DeficientOver: MIDDLE PLATTE RIVER
071311601, Union, IA
Built 1952 Load: 11.2 t ADT: 40
LOCAL
Structurally DeficientOver: BEAVER CREEK
083280901, Boone, IA
Built 1900 Load: 11.3 t ADT: 26
LOCAL - 700TH
Structurally DeficientOver: WATERWAY
075352302, Cass, IA
Built 1967 Load: 11.3 t ADT: 46
LOCAL
Structurally DeficientOver: BRUSH CREEK
085E30205, Jackson, IA
Built 1981 Load: 11.3 t ADT: 34
BUS US 30
Structurally DeficientOver: DEER CREEK
083152103, Tama, IA
Built 1953 Load: 11.3 t ADT: 2,887
FM
Structurally DeficientOver: TROUBLESOME CREEK
083131403, Tama, IA
Built 1964 Load: 11.3 t ADT: 226
252 STREET
Structurally DeficientOver: DRAINAGE #10
068423003, Fremont, IA
Built 1920 Load: 11.5 t ADT: 5
FM
Structurally DeficientOver: SMALL STREAM
081110805, Iowa, IA
Built 1959 Load: 11.5 t ADT: 60
LOCAL B AVE.
Structurally DeficientOver: WEST FORK LITTLE SIOUX
091422902, Cherokee, IA
Built 1916 Load: 11.6 t ADT: 11
FM
Structurally DeficientOver: STREAM
069260704, Decatur, IA
Built 1952 Load: 11.6 t ADT: 29
LOCAL
Structurally DeficientOver: CREEK
097172602, Floyd, IA
Built 1956 Load: 11.6 t ADT: 26
LOCAL ROAD
Structurally DeficientOver: BRANCH BLACK HAWK CREEK
088152302, Grundy, IA
Built 1977 Load: 11.6 t ADT: 30
Showing 20,201-20,250 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 |