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
670TH AVE
FairOver: SMALL STREAM
082223602, Story, IA
Built 1953 Load: 24.8 t ADT: 150
STONE PK BLVD
FairOver: PERRY CREEK
000000000, Woodbury, IA
Built 1978 Load: 24.8 t ADT: 6,129
LOCAL
FairOver: RUTT BRANCH
075331401, Adair, IA
Built 1961 Load: 24.9 t ADT: 11
LOCAL
FairOver: CREEK
080341401, Audubon, IA
Built 1933 Load: 24.9 t ADT: 11
LOCAL 240TH ST
FairOver: SMALL STREAM
088081401, Buchanan, IA
Built 1979 Load: 24.9 t ADT: 82
WB US 20
FairOver: WAPSIPINICON RIVER
1.5 MI. E OF JCT. IA #150, Buchanan, IA
Built 1978 Load: 24.9 t ADT: 4,150
US 20
FairOver: DRAINAGE DITCH
4.2 MI. W OF JCT. IA 150, Buchanan, IA
Built 1980 Load: 24.9 t ADT: 10,100
FM
FairOver: PURGATORY CREEK
087322301, Calhoun, IA
Built 1965 Load: 24.9 t ADT: 150
LOCAL
FairOver: FIELD STREAM
082353404, Carroll, IA
Built 1954 Load: 24.9 t ADT: 11
FM - YANKTON
FairOver: THREE MILE CREEK
074363401, Cass, IA
Built 1977 Load: 24.9 t ADT: 34
FM - BOSTON
FairOver: INDIAN CREEK
077370701, Cass, IA
Built 1974 Load: 24.9 t ADT: 60
FM - BOSTON
FairOver: CAMP CREEK
077370901, Cass, IA
Built 1976 Load: 24.9 t ADT: 45
EB I-80
FairOver: SUGAR CREEK
1.5 MI. W OF E JCT. IA 38, Cedar, IA
Built 1960 Load: 24.9 t ADT: 18,650
FM
FairOver: WAPSINONOC CREEK
079040502, Cedar, IA
Built 1960 Load: 24.9 t ADT: 1,460
FM- 610TH ST
FairOver: OVERFLOW CHANNEL
090390901, Cherokee, IA
Built 1970 Load: 24.9 t ADT: 1,017
LOCAL-I AVE.
FairOver: SMALL STREAM
092410904, Cherokee, IA
Built 1973 Load: 24.9 t ADT: 40
LOCAL
FairOver: CHARITON CR
071243103, Clarke, IA
Built 1986 Load: 24.9 t ADT: 15
FM 350TH ST
FairOver: BIG MEADOW CREEK
096361501, Clay, IA
Built 1963 Load: 24.9 t ADT: 878
LOCAL 320TH ST.
FairOver: SMALL STREAM
087052501, Delaware, IA
Built 1995 Load: 24.9 t ADT: 15
LOCAL 165 ST
FairOver: LINDSEY CREEK
089050303, Delaware, IA
Built 1983 Load: 24.9 t ADT: 59
LOCAL 165 ST
FairOver: HONEY CREEK
089050303, Delaware, IA
Built 1983 Load: 24.9 t ADT: 59
GRANNIS RD.
FairOver: GRANNIS CREEK
093073103, Fayette, IA
Built 1985 Load: 24.9 t ADT: 29
LOCAL
FairOver: SMALL STREAM
096173302, Floyd, IA
Built 1987 Load: 24.9 t ADT: 26
LOCAL
FairOver: MIDDLE RIVER
078322701, Guthrie, IA
Built 1959 Load: 24.9 t ADT: 20
FM 110 ST
FairOver: BOYER RIVER
081410303, Harrison, IA
Built 1984 Load: 24.9 t ADT: 199
FM
FairOver: CROOKED CREEK
073070604, Henry, IA
Built 1968 Load: 24.9 t ADT: 130
LOCAL
FairOver: CREEK
092281104, Humboldt, IA
Built 1971 Load: 24.9 t ADT: 45
LOCAL
FairOver: CREEK
092292004, Humboldt, IA
Built 1900 Load: 24.9 t ADT: 15
LOCAL
FairOver: CLEAR CREEK
081201704, Jasper, IA
Built 1998 Load: 24.9 t ADT: 21
FM SUTLIFF RD
FairOver: CEDAR RIVER
081051105, Johnson, IA
Built 1983 Load: 24.9 t ADT: 480
72ND ST.
FairOver: SMALL CREEK
084013505, Jones, IA
Built 1992 Load: 24.9 t ADT: 34
80TH ST.
FairOver: SMALL CREEK
084032703, Jones, IA
Built 2011 Load: 24.9 t ADT: 69
US 136
FairOver: SOAP CREEK & BNSF RR
1.8 MI. E OF JCT US 61, Lee, IA
Built 1974 Load: 24.9 t ADT: 3,220
FM
FairOver: CHARITON RIVER
071201904, Lucas, IA
Built 1985 Load: 24.9 t ADT: 50
LOCAL
FairOver: BR OF CHARITON RIVER
071202702, Lucas, IA
Built 1998 Load: 24.9 t ADT: 11
FM
FairOver: LIZARD CREEK
098463301, Lyon, IA
Built 1970 Load: 24.9 t ADT: 399
LOCAL
FairOver: DRAINAGE
075290202, Madison, IA
Built 1997 Load: 24.9 t ADT: 34
LOCAL
FairOver: DRAINAGE
077292102, Madison, IA
Built 1959 Load: 24.9 t ADT: 34
IA 175
FairOver: DRAINAGE DITCH
1.3 mi. E of SR L20, Monona, IA
Built 1973 Load: 24.9 t ADT: 1,200
US 71
FairOver: BNSF RR
0.9 MI. South OF SR N-46, Montgomery, IA
Built 1972 Load: 24.9 t ADT: 1,640
FM
FairOver: BR NODAWAY WEST
072362102, Montgomery, IA
Built 1958 Load: 24.9 t ADT: 34
LOCAL
FairOver: MILL CREEK
094412901, O'Brien, IA
Built 1970 Load: 24.9 t ADT: 46
LOCAL
FairOver: LAKE CREEK
095400801, O'Brien, IA
Built 1979 Load: 24.9 t ADT: 26
140TH STREET
FairOver: MIDDLE TARKIO RIVER
070382501, Page, IA
Built 1987 Load: 24.9 t ADT: 687
US 59
FairOver: E BR W NISHNABOTNA RVR
1.0 mi. S of Jct. IA 83, Pottawattamie, IA
Built 1929 Load: 24.9 t ADT: 2,680
LOCAL
FairOver: CREEK
000000000, Pottawattamie, IA
Built 2009 Load: 24.9 t ADT: 50
LOCAL
FairOver: TURKEY CREEK
069312802, Ringgold, IA
Built 2004 Load: 24.9 t ADT: 15
LOCAL
FairOver: RAVEN CREEK
082160404, Tama, IA
Built 1940 Load: 24.9 t ADT: 39
LOCAL
FairOver: BRANCH DEER CREEK
083151003, Tama, IA
Built 1999 Load: 24.9 t ADT: 11
LOCAL
FairOver: SUGAR CREEK
084162901, Tama, IA
Built 1987 Load: 24.9 t ADT: 15
Showing 4,101-4,150 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 |