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
US 18 WB
UnknownOver: WINNEBAGO RIVER & ROAD
0.7 mi. E of Jct. SR S56, Cerro Gordo, IA
Built 1998 ADT: 70
CO RD S-56
UnknownOver: US 18
At Jct. S.R. S56, Cerro Gordo, IA
Built 1998 ADT: 9,800
MALLARD AVE
UnknownOver: US 18
4.4 mi. E of jct. I-35, Cerro Gordo, IA
Built 1998 ADT: 7,400
WARBLER AVE
UnknownOver: US 18
3.1 mi. E of Jct. SR S56, Cerro Gordo, IA
Built 1997 ADT: 11,100
US 18 & IA 346
UnknownOver: U.S. 63
At E Jct. U.S. 63, Chickasaw, IA
Built 2002 ADT: 4,370
225TH STREET
UnknownOver: US 18 & 63
2.6 mi. E of W Jct. US 63, Chickasaw, IA
Built 2002 ADT: 4,670
US 63 NB
UnknownOver: US 18
At N Jct. US 18, Chickasaw, IA
Built 2000 ADT: 2,400
US 63 SB
UnknownOver: US 18
At N Jct. U.S. 18, Chickasaw, IA
Built 2000 ADT: 2,400
US 18 WB & 63 NB
UnknownOver: IMRR AND B-57
0.6 mi. E of W Jct. US 63, Chickasaw, IA
Built 2002 ADT: 575
US 18 EB & 63 SB
UnknownOver: IMRR & B-57
0.6 mi. E of W Jct. US 63, Chickasaw, IA
Built 2002 ADT: 575
LA SALLE AVE
UnknownOver: US 63
1.8 mi. N of N Jct. US 18, Chickasaw, IA
Built 2002 ADT: 3,410
290TH STREET
UnknownOver: US 218
1.2 mi. S of Jct. IA 346, Chickasaw, IA
Built 2002 ADT: 11,000
IA 346
UnknownOver: US 218
AT JCT. OF US 218, Chickasaw, IA
Built 2003 ADT: 9,300
DOYLE ST
UnknownOver: INTERSTATE 35
2.0 mi. S of SR H45, Clarke, IA
Built 1969 ADT: 16,000
CLAY STREET
UnknownOver: I-35
1.0 mi. N of US 34, Clarke, IA
Built 1999 ADT: 15,500
NB US 61
UnknownOver: IA 136
AT JCT. OF IA 136, Clinton, IA
Built 1995 ADT: 485
SB US 61
UnknownOver: IA 136
AT JCT. OF IA. 136, Clinton, IA
Built 1995 ADT: 970
EB US 30
UnknownOver: S 6TH AVE
1.5 MI. E OF E JCT. US 61, Clinton, IA
Built 1970 ADT: 2,410
WB US 30
UnknownOver: S 6TH AVE
1.5 MI. E OF E JCT. US 61, Clinton, IA
Built 1970 ADT: 2,410
NB US 61
UnknownOver: 225TH STREET
1.1 MI N OF N JCT. US 30, Clinton, IA
Built 1974 ADT: 80
SB US 61
UnknownOver: 225TH STREET
1.1 MI. N OF N JCT. US 30, Clinton, IA
Built 1974 ADT: 100
NB US 61
UnknownOver: US 30 & W.11TH ST
AT N JCT. OF US 30, Clinton, IA
Built 1970 ADT: 1,630
SB US 61
UnknownOver: US 30 & W 11TH ST
AT N JCT. OF US 30, Clinton, IA
Built 1970 ADT: 1,445
FM
UnknownOver: US 61
1.6 MI.S.of S. Jct.US 30, Clinton, IA
Built 1984 ADT: 18,000
110TH ST
UnknownOver: US 61
1.0 MI. N OF JCT. IA #136, Clinton, IA
Built 1996 ADT: 9,500
CO RD Y 62
UnknownOver: US 30
0.3 mi. W of E Jct. US 61, Clinton, IA
Built 1975 ADT: 14,400
US 30
UnknownOver: US 30 & US 61
At E jct. of US 61, Clinton, IA
Built 1975 ADT: 11,200
P 58 L AVE
UnknownOver: I-80
AT JUNCTION SR F90 & I-80, Dallas, IA
Built 1966 ADT: 30,000
OLD PORTLAND RD
UnknownOver: I-80
2.0 MI. E OF JCT. 169, Dallas, IA
Built 1966 ADT: 36,300
JORDAN CREEK PKWY
UnknownOver: I-80
1.6 mi. W of W Jct. I-35, Dallas, IA
Built 2001 ADT: 42,900
IA 210
UnknownOver: IA 141
AT JCT. OF IA #141, Dallas, IA
Built 1997 ADT: 7,100
EB IA 141
UnknownOver: US 169
AT JUNCTION OF US 169, Dallas, IA
Built 1978 ADT: 1,720
WB IA 141
UnknownOver: US 169
AT JUNCTION OF US 169, Dallas, IA
Built 1978 ADT: 1,720
NB I-35
UnknownOver: 324TH STREET
AT MISSOURI STATE LINE, Decatur, IA
Built 1970 ADT: 195
NB I-35
UnknownOver: 310TH ST
2.5 mi. S of US 69, Decatur, IA
Built 1970 ADT: 65
198TH STREET
UnknownOver: I-35
1.3 mi. N of Jct. IA 2, Decatur, IA
Built 1969 ADT: 14,600
FM
UnknownOver: I 35
4.5 mi. N of Jct. IA 2, Decatur, IA
Built 1969 ADT: 14,600
J14
UnknownOver: I-35
At the Jct. SR J14, Decatur, IA
Built 1968 ADT: 15,100
REST AREA ROAD
UnknownOver: REST AREA ROAD
3.0 MI. N OF Jct. U.S. 69, Decatur, IA
Built 1994 ADT: 13,800
W63 100TH AVE
UnknownOver: U.S. 20
3.5 mi. E of Jct. IA 187, Delaware, IA
Built 1970 ADT: 6,500
S 3RD ST
UnknownOver: US 20
1.2 MI. E OF JCT. IA 13, Delaware, IA
Built 1974 ADT: 7,700
FM D-5X
UnknownOver: US 20
AT JCT. SR D5X, Delaware, IA
Built 1973 ADT: 6,800
US 20 EB
UnknownOver: 205TH AVE SPRING BRANCH
2.8 MI. W OF JCT. IA 38, Delaware, IA
Built 1973 ADT: 150
US 20 WB
UnknownOver: 205TH AVE SPRING BRANCH
2.8 MI. W OF JCT. IA 38, Delaware, IA
Built 1973 ADT: 150
220TH AVE
UnknownOver: US 20
At jct. US 20, Delaware, IA
Built 1973 ADT: 8,600
IA 38
UnknownOver: US 20
AT THE JCT. OF US 20, Delaware, IA
Built 1974 ADT: 7,500
X 35 (270TH AVE)
UnknownOver: US 20
3.7 mi. E of Jct. IA #38, Delaware, IA
Built 1987 ADT: 8,100
CENTRAL AVE
UnknownOver: US 34
1.7 mi E of Jct US 61, Des Moines, IA
Built 1970 ADT: 16,500
EB US 34
UnknownOver: BROADWAY AVE
1.0 MI. W JCT. U.S. 61, Des Moines, IA
Built 1976 ADT: 2,900
WB US 34
UnknownOver: BROADWAY AVE
1.0 MI. W OF JCT. U.S. 61, Des Moines, IA
Built 1976 ADT: 2,900
Showing 151-200 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 |