Total Bridges
20,753
Public highway bridges in Iowa
State profile · Above median Poor share
Iowa bridge safety
Condition ratings, load ratings, and Poor-condition data for every public highway bridge in Iowa, based on the FHWA National Bridge Inventory.
- 20,753
- Public bridges
- 36.5%
- Good condition
- 20.0%
- Poor condition
Data updated May 2026
Good Condition
36.5%
7,582 bridges rated 7-9
-13.5pp vs 50% benchmark
Poor Condition
20.0%
4,153 bridges whose lowest applicable component is rated 0-4
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 - Poor-condition share 66.7%
National avg
Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.
Condition Distribution
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 by Poor-condition share (lower share = better)
States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below Iowa on the same metric.
WV
West Virginia
16.02% top marginal rate
SD
South Dakota
16.24% top marginal rate
IA
Iowa
20.01% top marginal rate
VI
Virgin Islands
29.17% top marginal rate
Bridges Needing Most Attention in Iowa
Six lowest-condition bridges in Iowa, ranked by the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.
270TH STREET
PoorOver: 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
PoorOver: MUD CREEK
87-12-15-02-10, Black Hawk, IA
Built 1948 Load: 2.7 t ADT: 11
LOCAL - 700TH
PoorOver: TRIB TROUBLESOME CREEK
077351402, Cass, IA
Built 1983 Load: 2.7 t ADT: 11
LOCAL - DAYTONA
PoorOver: BUCK CREEK
077361903, Cass, IA
Built 1980 Load: 2.7 t ADT: 35
100TH ST.
PoorOver: UNION CREEK
083E20101, Clinton, IA
Built 1900 Load: 2.7 t ADT: 78
All Bridges in Iowa
FM
FairOver: CREEK
088201206, Hardin, IA
Built 1988 Load: 35.0 t ADT: 104
F20 220TH TRL
FairOver: PRICE CREEK
081092609, Iowa, IA
Built 1978 Load: 35.0 t ADT: 450
FM
FairOver: SMALL STREAM
085E22403, Jackson, IA
Built 1998 Load: 35.0 t ADT: 630
RUSTY WALACE DR
FairOver: SMALL STREAM
000000000, Jasper, IA
Built 1998 Load: 35.0 t ADT: 600
SE SIOUX AVE
FairOver: CROOKED CREEK
078053102, Johnson, IA
Built 1992 Load: 35.0 t ADT: 40
LOCAL
FairOver: SMALL STREAM
074051402, Louisa, IA
Built 1982 Load: 35.0 t ADT: 30
LOCAL
FairOver: SMALL STREAM
074052501, Louisa, IA
Built 1986 Load: 35.0 t ADT: 26
FM-HUTCHINGS AV
FairOver: RAINES BRANCH
072411001, Mills, IA
Built 1954 Load: 35.0 t ADT: 45
V AVENUE
FairOver: BUCHANAN CREEK
067361506, Page, IA
Built 1975 Load: 35.0 t ADT: 50
WISCONSIN AVE
FairOver: CARDINAL CREEK
000000000, Scott, IA
Built 1960 Load: 35.0 t ADT: 930
NB US 61
FairOver: WAPSIPINICON RIVER
2.4 mi. N of SR F33, Scott, IA
Built 1981 Load: 35.0 t ADT: 8,800
LOCAL
FairOver: SMALL
096460701, Sioux, IA
Built 1954 Load: 35.0 t ADT: 110
LOCAL
FairOver: TRIB CONQUEST CREEK
069111403, Van Buren, IA
Built 2004 Load: 35.0 t ADT: 5
SB US 218
FairOver: GOOSE CREEK
6.6 MI. N OF JCT. IA 92, Washington, IA
Built 1984 Load: 35.0 t ADT: 7,450
US 218 SB
FairOver: ENGLISH RIVER
0.6 MI. S OF JCT. IA 22, Washington, IA
Built 1984 Load: 35.0 t ADT: 7,450
FM
FairOver: WONDER CREEK
097102305, Winneshiek, IA
Built 1970 Load: 35.0 t ADT: 88
LOCAL
FairOver: SMALL CREEK
098091602, Winneshiek, IA
Built 1985 Load: 35.0 t ADT: 20
YANKEE AVE
FairOver: DD #29
090232305, Wright, IA
Built 1978 Load: 35.0 t ADT: 35
LOCAL
FairOver: DD #29
090232304, Wright, IA
Built 1978 Load: 35.0 t ADT: 35
SB 218,EB 57
FairOver: CEDAR RIVER OVERFLOW
0.2 mi. E of jct. IA 27, Black Hawk, IA
Built 1974 Load: 35.1 t ADT: 9,800
LOCAL
FairOver: CREEK
088010902, Dubuque, IA
Built 1900 Load: 35.1 t ADT: 49
LOCAL
FairOver: STREAM
080310901, Guthrie, IA
Built 1968 Load: 35.1 t ADT: 50
FM
FairOver: DRAINAGE DITCH
091292101, Humboldt, IA
Built 1958 Load: 35.1 t ADT: 170
US 34
FairOver: LITTLE TARKIO CREEK
0.2 MI. E of SR M63, Montgomery, IA
Built 1964 Load: 35.1 t ADT: 2,880
IA 48
FairOver: OVERFLOW NISHNABOTNA
2.0 mi. S of Jct. SR H14, Montgomery, IA
Built 1973 Load: 35.1 t ADT: 1,210
SB I-35
FairOver: OVER UPP RR
1.1 MILES N OF N JCT I-80, Polk, IA
Built 2002 Load: 35.1 t ADT: 45,700
FM
FairOver: STREAM
079131707, Poweshiek, IA
Built 1975 Load: 35.1 t ADT: 20
FM
FairOver: WILLOW CREEK
811439, Shelby, IA
Built 1969 Load: 35.1 t ADT: 887
670TH AVE
FairOver: EAST INDIAN CREEK
084221202, Story, IA
Built 1915 Load: 35.1 t ADT: 26
LOCAL
FairOver: STREAM
071290701, Union, IA
Built 1965 Load: 35.1 t ADT: 46
IA 2
FairOver: JACKSON CREEK
3.8 MI. W OF Jct. SR S56, Wayne, IA
Built 1962 Load: 35.1 t ADT: 2,160
LOCAL
FairOver: CALEB CREEK
068230301, Wayne, IA
Built 1993 Load: 35.1 t ADT: 15
DYSART RD
FairOver: TRIB TO MILLER CREEK
88-12-19-04-10, Black Hawk, IA
Built 1981 Load: 35.2 t ADT: 1,463
FM
FairOver: HICKORY CREEK
067130506, Davis, IA
Built 1976 Load: 35.2 t ADT: 290
LOC 60TH AVE
FairOver: PRAIRIE CREEK
098301202, Kossuth, IA
Built 1990 Load: 35.2 t ADT: 41
IA 25
FairOver: STREAM
2.3 MI. N OF N JCT SR J23, Ringgold, IA
Built 1934 Load: 35.2 t ADT: 1,250
OLD STAGE RD
FairOver: CREEK
098082407, Winneshiek, IA
Built 2001 Load: 35.2 t ADT: 1,051
LOCAL
FairOver: BRANCH WATERLOO CREEK
100061306, Allamakee, IA
Built 1960 Load: 35.3 t ADT: 39
LOCAL
FairOver: CREEK
078360603, Audubon, IA
Built 1973 Load: 35.3 t ADT: 51
FM 260TH AVE
FairOver: MONTGOMERY CREEK
094360202, Clay, IA
Built 1978 Load: 35.3 t ADT: 71
160TH ST.
FairOver: DD #12
082E20501, Clinton, IA
Built 1979 Load: 35.3 t ADT: 35
175TH ST
FairOver: DRAINAGE DITCH #12
082E21105, Clinton, IA
Built 1980 Load: 35.3 t ADT: 16
IA 13
FairOver: BRANCH MAQUOKETA RIVER
0.9 mi N of N jct. SR D47, Delaware, IA
Built 1975 Load: 35.3 t ADT: 4,840
OLD MILL RD
FairOver: CATFISH CREEK
N.W. OF ROCKDALE RD, Dubuque, IA
Built 1978 Load: 35.3 t ADT: 5,395
FM
FairOver: BIG CREEK
071060603, Henry, IA
Built 1992 Load: 35.3 t ADT: 540
SW HAZELWOOD AV
FairOver: STREAM
078070804, Johnson, IA
Built 1966 Load: 35.3 t ADT: 72
LOCAL
FairOver: STREAM
080061204, Johnson, IA
Built 1972 Load: 35.3 t ADT: 153
SWAN LAKE RD NE
FairOver: STREAM
080070503, Johnson, IA
Built 1973 Load: 35.3 t ADT: 100
MILITARY RD
FairOver: BR KITTY CREEK
086033306, Jones, IA
Built 1936 Load: 35.3 t ADT: 62
FM
FairOver: NISHNABOTNA TRIB
073381304, Montgomery, IA
Built 1957 Load: 35.3 t ADT: 34
Showing 7,551-7,600 of 20,753 bridges
Related
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.
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). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.
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.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.