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 ROAD
Structurally DeficientOver: CREEK
086180601, Grundy, IA
Built 1974 Load: 7.6 t ADT: 29
E 64TH ST S
Structurally DeficientOver: STREAM
078181806, Jasper, IA
Built 1940 Load: 7.6 t ADT: 5
LOCAL
Structurally DeficientOver: OVER BNSF RR
072392006, Montgomery, IA
Built 1977 Load: 7.6 t ADT: 61
FM
Structurally DeficientOver: SALT CREEK
085143406, Tama, IA
Built 1951 Load: 7.6 t ADT: 79
LOCAL
Structurally DeficientOver: STREAM
069172603, Appanoose, IA
Built 1998 Load: 7.7 t ADT: 11
BLUEBIRD AVE
Structurally DeficientOver: DRAINAGE
092483102, Plymouth, IA
Built 1949 Load: 7.7 t ADT: 20
NEWPORT RD
Structurally DeficientOver: BEAR BRANCH
075360702, Cass, IA
Built 1984 Load: 7.8 t ADT: 15
LOCAL ROAD
Structurally DeficientOver: CREEK
097091101, Winneshiek, IA
Built 1900 Load: 7.8 t ADT: 44
LOCAL - AKRON
Structurally DeficientOver: TROUBLESOME CREEK
077350203, Cass, IA
Built 1900 Load: 7.9 t ADT: 5
COUNTY ROAD
Structurally DeficientOver: MOSQUITO CREEK
080290502, Dallas, IA
Built 1942 Load: 7.9 t ADT: 72
LOCAL ROAD
Structurally DeficientOver: LITTLE ROCK RIVER
098452907, Lyon, IA
Built 1900 Load: 7.9 t ADT: 62
LOCAL ROAD
Structurally DeficientOver: BRANCH OTTER CREEK
074230604, Warren, IA
Built 1970 Load: 7.9 t ADT: 30
LOCAL
Structurally DeficientOver: ELK CREEK
069270604, Decatur, IA
Built 1961 Load: 8.0 t ADT: 15
117TH ST
Structurally DeficientOver: SAND CREEK
070271706, Decatur, IA
Built 1900 Load: 8.0 t ADT: 11
FM
Structurally DeficientOver: BEAR CREEK
079322606, Guthrie, IA
Built 1959 Load: 8.0 t ADT: 60
210TH STREET
Structurally DeficientOver: STREAM
072333403, Adams, IA
Built 1966 Load: 8.1 t ADT: 11
LOCAL
Structurally DeficientOver: CREEK
079343005, Audubon, IA
Built 1967 Load: 8.1 t ADT: 11
LOCAL
Structurally DeficientOver: PRAIRIE CREEK
084112904, Benton, IA
Built 1970 Load: 8.1 t ADT: 50
LOCAL
Structurally DeficientOver: RACCOON RIVER
091361503, Buena Vista, IA
Built 1933 Load: 8.1 t ADT: 34
LOCAL
Structurally DeficientOver: NORTH WHITE BREAST CREEK
071240604, Clarke, IA
Built 1982 Load: 8.1 t ADT: 15
LOCAL
Structurally DeficientOver: TRIB TO MASON CREEK
079322806, Guthrie, IA
Built 1957 Load: 8.1 t ADT: 20
LOCAL
Structurally DeficientOver: MUCHAKINOCH CREEK
075161710, Mahaska, IA
Built 1951 Load: 8.1 t ADT: 60
LOCAL
Structurally DeficientOver: SUN VALLEY CREEK
070302606, Ringgold, IA
Built 1980 Load: 8.1 t ADT: 5
LOCAL
Structurally DeficientOver: BR RACCOON RIVER
091361001, Buena Vista, IA
Built 1923 Load: 8.2 t ADT: 20
400 AVENUE
Structurally DeficientOver: STREAM
068403406, Fremont, IA
Built 1966 Load: 8.2 t ADT: 5
LOCAL ROAD
Structurally DeficientOver: SOUTH FORK BEAVER CREEK
088180101, Grundy, IA
Built 1948 Load: 8.2 t ADT: 44
LOCAL
Structurally DeficientOver: BR MIDDLE FORK ENGLISH R
078121306, Iowa, IA
Built 1925 Load: 8.2 t ADT: 11
FM
Structurally DeficientOver: BRANCH CROOKED CREEK
069301401, Ringgold, IA
Built 1957 Load: 8.2 t ADT: 71
LOCAL
Structurally DeficientOver: CREEK
070332302, Taylor, IA
Built 1953 Load: 8.2 t ADT: 11
LOCAL
Structurally DeficientOver: NORTH FORK LONG CREEK
076072901, Washington, IA
Built 1929 Load: 8.2 t ADT: 5
LOCAL QUAIL AVE
Structurally DeficientOver: BEAVER CREEK
090202302, Franklin, IA
Built 1954 Load: 8.3 t ADT: 11
MIRACLE LN
Structurally DeficientOver: STREAM
079313203, Guthrie, IA
Built 1950 Load: 8.3 t ADT: 11
VALE RD
Structurally DeficientOver: NICHOLS CR
100112704, Howard, IA
Built 1949 Load: 8.3 t ADT: 42
LOCAL
Structurally DeficientOver: HOG BRANCH
069331302, Taylor, IA
Built 1961 Load: 8.3 t ADT: 5
CARTER AVE
Structurally DeficientOver: DD
087302102, Webster, IA
Built 1959 Load: 8.3 t ADT: 11
LOCAL
Structurally DeficientOver: STREAM
069253008, Decatur, IA
Built 1960 Load: 8.4 t ADT: 190
LOCAL
Structurally DeficientOver: LITTLE BLUFF CK
074173505, Mahaska, IA
Built 1955 Load: 8.4 t ADT: 50
LOCAL
Structurally DeficientOver: EAGLE CREEK
092251701, Wright, IA
Built 1975 Load: 8.4 t ADT: 5
LOCAL
Structurally DeficientOver: ROCK CK
086111802, Benton, IA
Built 1974 Load: 8.5 t ADT: 11
FM
Structurally DeficientOver: PRAIRIE CREEK
080200203, Jasper, IA
Built 1955 Load: 8.5 t ADT: 40
LOCAL
Structurally DeficientOver: DRAINAGE
071381604, Montgomery, IA
Built 1945 Load: 8.5 t ADT: 20
LOCAL
Structurally DeficientOver: CREEK
067320201, Taylor, IA
Built 1950 Load: 8.5 t ADT: 20
LOCAL
Structurally DeficientOver: DRAINAGE DITCH 6
092252401, Wright, IA
Built 1967 Load: 8.5 t ADT: 81
LOCAL 560TH ST
Structurally DeficientOver: FIDDLE CREEK
091421701, Cherokee, IA
Built 1915 Load: 8.6 t ADT: 20
LOC YANKEE AVE
Structurally DeficientOver: NICHOLS CR
100112402, Howard, IA
Built 1949 Load: 8.6 t ADT: 42
LOCAL
Structurally DeficientOver: CROOKED CREEK
092311601, Pocahontas, IA
Built 1980 Load: 8.6 t ADT: 5
9TH AVE
Structurally DeficientOver: INDIAN CREEK
000000000, Pottawattamie, IA
Built 1930 Load: 8.6 t ADT: 4,059
LOCAL
Structurally DeficientOver: HONEY CREEK
069322801, Taylor, IA
Built 1960 Load: 8.6 t ADT: 15
LOCAL
Structurally DeficientOver: BR PRAIRIE CK
082111702, Benton, IA
Built 1970 Load: 8.7 t ADT: 20
LOCAL
Structurally DeficientOver: DRAINAGE DITCH
077100503, Keokuk, IA
Built 1983 Load: 8.7 t ADT: 11
Showing 20,051-20,100 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 |