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: SM STREAM
073041104, Louisa, IA
Built 1950 Load: 22.7 t ADT: 490
LOCAL
Structurally DeficientOver: BATTLE CREEK
075300601, Adair, IA
Built 1958 Load: 22.8 t ADT: 15
F44 290TH ST
Structurally DeficientOver: CEDAR RIVER
079031115, Cedar, IA
Built 1948 Load: 22.8 t ADT: 620
LOCAL
Structurally DeficientOver: PARNELL CREEK
086442506, Woodbury, IA
Built 1935 Load: 22.8 t ADT: 20
140TH ST
Structurally DeficientOver: STREAM
090052501, Delaware, IA
Built 1972 Load: 23.0 t ADT: 29
R AVE
Structurally DeficientOver: BRANCH OF BLACKHAWK CRK
088162302, Grundy, IA
Built 1976 Load: 23.0 t ADT: 50
S 60TH AVE W
Structurally DeficientOver: RED ROCK CREEK
079212501, Jasper, IA
Built 1926 Load: 23.2 t ADT: 30
LOCAL
Structurally DeficientOver: LONG DICK CR
086233401, Hamilton, IA
Built 1916 Load: 23.3 t ADT: 20
LOCAL-KEELN RD.
Structurally DeficientOver: BADGER CREEK
092402403, Cherokee, IA
Built 1917 Load: 23.8 t ADT: 170
240TH ST
Structurally DeficientOver: HAUGH CREEK
094100801, Fayette, IA
Built 1940 Load: 23.8 t ADT: 20
E-W 7TH AVE N
Structurally DeficientOver: WILLOW CREEK
092210900, Cerro Gordo, IA
Built 1900 Load: 24.2 t ADT: 26
LOCAL
Structurally DeficientOver: JACK CREEK
099323401, Emmet, IA
Built 1955 Load: 24.3 t ADT: 15
FM
Structurally DeficientOver: DRAINAGE DITCH
087462016, Woodbury, IA
Built 1960 Load: 24.3 t ADT: 230
LOCAL
Structurally DeficientOver: CREEK
084E11803, Jackson, IA
Built 1915 Load: 24.4 t ADT: 211
LOCAL
Structurally DeficientOver: SMALL STREAM
069040705, Des Moines, IA
Built 1970 Load: 24.5 t ADT: 26
210TH ST
Structurally DeficientOver: CREEK
098380601, Dickinson, IA
Built 1987 Load: 24.5 t ADT: 5
260TH ST
Structurally DeficientOver: CREEK
098373301, Dickinson, IA
Built 1980 Load: 24.5 t ADT: 315
235TH ST
Structurally DeficientOver: BROKEN KETTLE CK
091481107, Plymouth, IA
Built 1900 Load: 24.5 t ADT: 15
LOCAL
Structurally DeficientOver: BRANCH OF SALT CREEK
083133406, Tama, IA
Built 1987 Load: 24.5 t ADT: 26
FM
Structurally DeficientOver: CREEK
070111906, Van Buren, IA
Built 1955 Load: 24.5 t ADT: 50
FOX RD
Structurally DeficientOver: SPRING CREEK
88-11-24-01, Black Hawk, IA
Built 1949 Load: 24.6 t ADT: 49
LOCAL
Structurally DeficientOver: SMALL CREEK
086E13401, Jackson, IA
Built 1940 Load: 24.6 t ADT: 34
LOCAL
Structurally DeficientOver: SMALL STREAM
068291603, Ringgold, IA
Built 1951 Load: 24.6 t ADT: 11
LOCAL
Structurally DeficientOver: PAINT CREEK
E72000500, Allamakee, IA
Built 1900 Load: 24.7 t ADT: 120
FM
Structurally DeficientOver: HONEY CREEK
086202405, Hardin, IA
Built 1967 Load: 24.9 t ADT: 373
220 STREET
Structurally DeficientOver: HORSE CREEK
068431103, Fremont, IA
Built 1957 Load: 25.1 t ADT: 214
LOC 130TH AVE
Structurally DeficientOver: STREAM
089061502, Delaware, IA
Built 1970 Load: 25.3 t ADT: 42
FM
Structurally DeficientOver: STREAM
068173504, Appanoose, IA
Built 1955 Load: 25.4 t ADT: 35
LOCAL
Structurally DeficientOver: STREAM
069170801, Appanoose, IA
Built 1952 Load: 25.4 t ADT: 135
LOCAL
Structurally DeficientOver: CREEK
084173502, Marshall, IA
Built 1944 Load: 25.5 t ADT: 73
LOCAL
Structurally DeficientOver: EAST BRANCH SALT CREEK
084132703, Tama, IA
Built 1987 Load: 25.5 t ADT: 26
LOCAL
Structurally DeficientOver: SMALL STREAM
070150403, Davis, IA
Built 1940 Load: 25.6 t ADT: 34
FM - 690TH
Structurally DeficientOver: NODAWAY RIVER
074351502, Cass, IA
Built 1970 Load: 25.7 t ADT: 190
LOCAL
Structurally DeficientOver: BYERS BRANCH CREEK
081213002, Jasper, IA
Built 1947 Load: 25.7 t
LOCAL ROAD
Structurally DeficientOver: ALBERTSON CREEK
098471601, Lyon, IA
Built 1900 Load: 25.7 t ADT: 41
LOCAL
Structurally DeficientOver: FABIUS CREEK
067150505, Davis, IA
Built 1977 Load: 25.9 t ADT: 5
CO RD W64
Structurally DeficientOver: LONG CREEK
075062214, Washington, IA
Built 1929 Load: 25.9 t ADT: 140
LOCAL ROAD
Structurally DeficientOver: CREEK
097071508, Winneshiek, IA
Built 1972 Load: 25.9 t ADT: 15
LOCAL ROAD
Structurally DeficientOver: CREEK
100092702, Winneshiek, IA
Built 1900 Load: 25.9 t ADT: 5
IRIS AVE
Structurally DeficientOver: DRAINAGE DITCH
097130902, Howard, IA
Built 1966 Load: 26.0 t ADT: 21
FM
Structurally DeficientOver: LINN CREEK
083190212, Marshall, IA
Built 1963 Load: 26.0 t ADT: 216
M-70/REDWOOD
Structurally DeficientOver: NEELY BRANCH
069361806, Page, IA
Built 1962 Load: 26.0 t ADT: 678
REED AV
Structurally DeficientOver: STREAM
093122404, Bremer, IA
Built 1968 Load: 26.3 t ADT: 540
FM
Structurally DeficientOver: N. SKUNK RIVER
081190502, Jasper, IA
Built 1964 Load: 26.3 t ADT: 970
LOCAL
Structurally DeficientOver: DEEP RIVER
079143306, Poweshiek, IA
Built 1961 Load: 26.4 t ADT: 15
LOCAL
Structurally DeficientOver: BRANCH SUGAR CREEK
084160602, Tama, IA
Built 1920 Load: 26.5 t ADT: 29
LOC FINLEY AVE
Structurally DeficientOver: LIME CR
087102710, Buchanan, IA
Built 1925 Load: 26.6 t ADT: 11
285 STREET
Structurally DeficientOver: #6 DITCH
067420703, Fremont, IA
Built 1976 Load: 26.6 t ADT: 26
FM 250TH ST
Structurally DeficientOver: UNNAMED CREEK
096282401, Kossuth, IA
Built 1966 Load: 26.6 t ADT: 40
CO RD Y-68
Structurally DeficientOver: WAPSI RIVER OVERFLOW
081E43106, Scott, IA
Built 1922 Load: 27.0 t ADT: 2,310
Showing 20,651-20,700 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 |