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
VINE
FairOver: COLD WATER CREEK
094192202, Cerro Gordo, IA
Built 1972 Load: 33.2 t ADT: 16
130TH
FairOver: W BR BEAVER DAM CREEK
094222101, Cerro Gordo, IA
Built 1979 Load: 33.2 t ADT: 10
170TH
FairOver: BEAVER DAM CREEK
095213501, Cerro Gordo, IA
Built 1981 Load: 33.2 t ADT: 59
LARK
FairOver: BEAVER DAM CREEK
095213602, Cerro Gordo, IA
Built 1973 Load: 33.2 t ADT: 589
MALLARD
FairOver: CALMUS CREEK
097203004, Cerro Gordo, IA
Built 1964 Load: 33.2 t ADT: 3,290
300TH
FairOver: CALMUS CREEK
097212801, Cerro Gordo, IA
Built 1968 Load: 33.2 t ADT: 2,701
FM- L AVE
FairOver: BRANCH LITTLE SIOUX RVR
090411302, Cherokee, IA
Built 1971 Load: 33.2 t ADT: 290
290TH ST
FairOver: STONEY CREEK
097381401, Clay, IA
Built 2004 Load: 33.2 t ADT: 15
LOCAL
FairOver: SMALL
080300303, Guthrie, IA
Built 1978 Load: 33.2 t ADT: 45
IA 2
FairOver: DEVIL CREEK
0.5 MI. W OF JCT. US 61, Lee, IA
Built 1973 Load: 33.2 t ADT: 4,250
IA 3
FairOver: FLOYD RIVER
1.0 mi. E of US 75, Plymouth, IA
Built 1981 Load: 33.2 t ADT: 4,270
I 880 WB
FairOver: BNSF RR
0.3 MI. E OF JCT. 191, Pottawattamie, IA
Built 1966 Load: 33.2 t ADT: 2,850
R38/500TH AVE
FairOver: IOWAY CREEK
084240702, Story, IA
Built 1976 Load: 33.2 t ADT: 1,496
500TH
FairOver: DEER CREEK
100191801, Worth, IA
Built 1974 Load: 33.2 t ADT: 30
THRUSH
FairOver: DRAINAGE DITCH
100192902, Worth, IA
Built 1971 Load: 33.2 t ADT: 393
IA 5
FairOver: DME RR
1.0 MI. S OF JCT. SR J18, Appanoose, IA
Built 1974 Load: 33.3 t ADT: 3,120
E AIRLINE HWY
FairOver: TRIB TO ELK RUN CREEK
89-11-07-01-10, Black Hawk, IA
Built 1986 Load: 33.3 t ADT: 59
FM- 650TH ST
FairOver: STRATTON
090413301, Cherokee, IA
Built 1967 Load: 33.3 t ADT: 180
EAGLE RD
FairOver: ROBERTS CREEK
094051604, Clayton, IA
Built 1986 Load: 33.3 t ADT: 98
MILL CR. EXPWY.
FairOver: HARTS MILL CREEK
081061505, Clinton, IA
Built 2000 Load: 33.3 t ADT: 8,400
IA 141
FairOver: NORTH RACCOON RIVER
1.5 mi. W of IA 144, Dallas, IA
Built 1976 Load: 33.3 t ADT: 3,570
LOCAL
FairOver: CURRAN BRANCH
087010104, Dubuque, IA
Built 1938 Load: 33.3 t ADT: 40
W AVE
FairOver: STOE CREEK
092101602, Fayette, IA
Built 1963 Load: 33.3 t ADT: 766
IA 2
FairOver: EAST NISHNABOTNA RIVER
3.3 MI. W OF JCT. 59, Fremont, IA
Built 1975 Load: 33.3 t ADT: 1,910
FM
FairOver: S. RACCOON RIVER
078301003, Guthrie, IA
Built 1959 Load: 33.3 t ADT: 34
LOCAL
FairOver: SOUTH RACCOON RIVER
080330304, Guthrie, IA
Built 1986 Load: 33.3 t ADT: 34
LOCAL
FairOver: SOUTH RACCOON RIVER
080330403, Guthrie, IA
Built 1986 Load: 33.3 t ADT: 34
US 169
FairOver: TRULNER CREEK
0.3 mi. S of SR C20, Humboldt, IA
Built 1995 Load: 33.3 t ADT: 3,220
FM
FairOver: SPRUCE CREEK
087E43606, Jackson, IA
Built 1982 Load: 33.3 t ADT: 670
LOCAL
FairOver: BURR OAK CREEK
073080703, Jefferson, IA
Built 1978 Load: 33.3 t ADT: 20
LOCAL
FairOver: STREAM
073090702, Jefferson, IA
Built 1972 Load: 33.3 t ADT: 15
FM
FairOver: HOG THIEF HOLLOW
065052011, Lee, IA
Built 1958 Load: 33.3 t ADT: 280
LOCAL
FairOver: STREAM
077211203, Marion, IA
Built 1997 Load: 33.3 t ADT: 30
FM
FairOver: WHIPPERWILL CREEK
072191205, Monroe, IA
Built 1989 Load: 33.3 t ADT: 50
N AVENUE
FairOver: SNAKE CREEK
069372102, Page, IA
Built 1986 Load: 33.3 t ADT: 110
FM
FairOver: DD #114
097332605, Palo Alto, IA
Built 1982 Load: 33.3 t ADT: 81
IA 10
FairOver: BIG SIOUX RIVER
At S Dakota St. Line, Sioux, IA
Built 1991 Load: 33.3 t ADT: 1,910
LOCAL
FairOver: CREEK
070353204, Taylor, IA
Built 1957 Load: 33.3 t ADT: 34
LOCAL
FairOver: BUCKEYE CREEK
072121306, Wapello, IA
Built 1987 Load: 33.3 t ADT: 21
LOCAL
FairOver: STREAM
0894332, Woodbury, IA
Built 2006 Load: 33.3 t ADT: 30
LOCAL
FairOver: LITTLE CEDAR CREEK
095140503, Chickasaw, IA
Built 2005 Load: 33.4 t ADT: 16
FM
FairOver: SHELL ROCK RIVER
095183602, Floyd, IA
Built 1967 Load: 33.4 t ADT: 118
IA 175
FairOver: DRAINAGE DITCH
0.2 MI. E OF E JCT. US 69, Hamilton, IA
Built 1977 Load: 33.4 t ADT: 1,690
FM
FairOver: TRULINER CREEK
093292201, Humboldt, IA
Built 1937 Load: 33.4 t ADT: 649
LOCAL
FairOver: DRAINAGE
081090702, Iowa, IA
Built 1976 Load: 33.4 t ADT: 30
US 151
FairOver: CLEAR CREEK
1.9 MI. N OF JCT. I 80, Iowa, IA
Built 1984 Load: 33.4 t ADT: 1,510
FM 13TH ST
FairOver: SILVER CREEK
084E33203, Jackson, IA
Built 2000 Load: 33.4 t ADT: 246
FM
FairOver: S FORK MAQUOKETA RIVER
085E20704, Jackson, IA
Built 1961 Load: 33.4 t ADT: 60
US 169
FairOver: BLUE EARTH RIVER
0.5 mi. S of Jct. SR A16, Kossuth, IA
Built 1992 Load: 33.4 t ADT: 1,430
FM
FairOver: TOM CREEK
100432002, Lyon, IA
Built 1972 Load: 33.4 t ADT: 90
Showing 7,251-7,300 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.