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: SNY MAGILL
094032206, Clayton, IA
Built 1980 Load: 39.5 t ADT: 953
200TH STREET
FairOver: BUFFALO CR
092210601, Franklin, IA
Built 1965 Load: 39.5 t ADT: 21
FM
FairOver: BIG BEAR CREEK
080110706, Iowa, IA
Built 1995 Load: 39.5 t ADT: 540
LOCAL
FairOver: CREEK
086E32603, Jackson, IA
Built 1978 Load: 39.5 t ADT: 50
IA 38
FairOver: KITTY CREEK
0.5 MI. N OF JCT. 151, Jones, IA
Built 1973 Load: 39.5 t ADT: 3,630
CHERRY GROVE RD
FairOver: WHITE OAK CREEK
083043502, Jones, IA
Built 1978 Load: 39.5 t ADT: 30
FRONT DR.
FairOver: OTTER CREEK
084081233, Linn, IA
Built 1990 Load: 39.5 t ADT: 923
220TH AVE
FairOver: BR OF CHARITON RIVER
072222504, Lucas, IA
Built 1959 Load: 39.5 t ADT: 187
DURHAM AVE
FairOver: NORTH SKUNK RIVER
082201006, Marshall, IA
Built 1973 Load: 39.5 t ADT: 113
FM
FairOver: CEDAR RIVER
076040203, Muscatine, IA
Built 1997 Load: 39.5 t ADT: 550
LOCAL NE 54TH
FairOver: FOUR MILE CREEK
080240100, Polk, IA
Built 1990 Load: 39.5 t ADT: 1,377
US 65
FairOver: DRAINAGE DITCH
2.8 MI. N OF JCT. IA 2, Wayne, IA
Built 1976 Load: 39.5 t ADT: 1,050
FM
FairOver: LIZARD CREEK
090301804, Webster, IA
Built 1971 Load: 39.5 t ADT: 20
LOCAL
FairOver: MUD CREEK
082101201, Benton, IA
Built 1990 Load: 39.6 t ADT: 14
FM
FairOver: MUD CREEK
084100703, Benton, IA
Built 1989 Load: 39.6 t ADT: 60
LOCAL
FairOver: IOWAY CREEK
085250501, Boone, IA
Built 1988 Load: 39.6 t ADT: 20
IA 281
FairOver: LITTLE WAPSIPINICON RVR
0.2 mi. E of SR V62, Buchanan, IA
Built 1954 Load: 39.6 t ADT: 2,670
LOCAL
FairOver: TWO MILE CREEK
094141101, Chickasaw, IA
Built 1977 Load: 39.6 t ADT: 25
LOCAL
FairOver: LITTLE TURKEY
096112305, Chickasaw, IA
Built 1978 Load: 39.6 t ADT: 47
LOCAL
FairOver: LITTLE SIOUX RIVER
100372903, Dickinson, IA
Built 1989 Load: 39.6 t ADT: 20
FM
FairOver: JOHNNY CREEK
074040702, Louisa, IA
Built 1970 Load: 39.6 t ADT: 50
US 61 SB
FairOver: S FORK MAQUOKET RIVER
0.5 MI. N OF JCT. IA #64, Jackson, IA
Built 1998 Load: 39.7 t ADT: 5,100
FM
FairOver: DRAINAGE
072180805, Monroe, IA
Built 1957 Load: 39.7 t ADT: 80
LOCAL
FairOver: BRANCH OF IOWA RIVER
084162305, Tama, IA
Built 2006 Load: 39.7 t ADT: 15
FM
FairOver: JORDAN CREEK
070212103, Wayne, IA
Built 1965 Load: 39.7 t ADT: 280
LOCAL - 680TH
FairOver: WATERWAY
074352804, Cass, IA
Built 1985 Load: 39.8 t ADT: 5
LOCAL
FairOver: LONG CREEK
070042801, Des Moines, IA
Built 1977 Load: 39.8 t ADT: 91
LOCAL
FairOver: COTTONWOOD DRAIN
071022501, Des Moines, IA
Built 1992 Load: 39.8 t ADT: 176
LOCAL
FairOver: SMALL CREEK
085E22430, Jackson, IA
Built 2001 Load: 39.8 t ADT: 11
IA 182
FairOver: STREAM
0.2 mi N of Jct. SR A34, Lyon, IA
Built 1955 Load: 39.8 t ADT: 2,500
E41 LINCOLN HWY
FairOver: DYE CREEK
083210701, Story, IA
Built 2001 Load: 39.8 t ADT: 1,048
FM 145 AVE
FairOver: PRAIRIE CREEK
089062604, Delaware, IA
Built 1971 Load: 39.9 t ADT: 1,296
100 TH
FairOver: HARDIN CREEK
085310203, Greene, IA
Built 1982 Load: 39.9 t ADT: 20
US 18
FairOver: WEST FORK IOWA RIVER
2.8 mi. E of SR R35, Hancock, IA
Built 1958 Load: 39.9 t ADT: 5,200
LOCAL
FairOver: SMALL STREAM
076050203, Louisa, IA
Built 1989 Load: 39.9 t ADT: 51
US 34 & 65
FairOver: OVER BNSF RR
0.1 mi. E of W Jct. US 65, Lucas, IA
Built 1974 Load: 39.9 t ADT: 3,560
FM
FairOver: GINGER CREEK
095402901, O'Brien, IA
Built 1928 Load: 39.9 t ADT: 180
FM
FairOver: ROCK RIVER
095470603, Sioux, IA
Built 1969 Load: 39.9 t ADT: 139
FM
FairOver: STREAM
069111406, Van Buren, IA
Built 1989 Load: 39.9 t ADT: 720
LOCAL
FairOver: FITZGERALD CREEK
096073303, Winneshiek, IA
Built 1969 Load: 39.9 t ADT: 33
HUDSON RD
FairOver: DRY RUN CREEK
000000000, Black Hawk, IA
Built 1969 Load: 40.0 t ADT: 6,993
SB I-35,WB I-80
FairOver: DRAINAGE DITCH
0.8 mi. W of Jct. IA 415, Polk, IA
Built 1958 Load: 40.0 t ADT: 48,000
EB I-80
FairOver: SILVER CREEK
5.1 mi. W of Jct. US 59, Pottawattamie, IA
Built 1966 Load: 40.0 t ADT: 12,850
ELK AVE
FairOver: STREAM
3.0 mi W of N72 on 330th, Adair, IA
Built 2019 Load: 40.1 t ADT: 30
LOCAL
FairOver: DRY RUN CREEK
094160102, Floyd, IA
Built 1983 Load: 40.1 t ADT: 11
NB IA 5 & WB 92
FairOver: WHITE BREAST CREEK
2.7 MI. N OF JCT. Iowa 14, Marion, IA
Built 1978 Load: 40.1 t ADT: 4,200
BRIDGE ST
FairOver: HONEY CREEK
092052524, Clayton, IA
Built 1973 Load: 40.2 t ADT: 589
FM
FairOver: MIDDLE MAQUOKETA RIVER
090E13204, Dubuque, IA
Built 1974 Load: 40.2 t ADT: 350
US 20
FairOver: DRAINAGE DITCH #4
1.8 MILES EAST OF US 69, Hamilton, IA
Built 1968 Load: 40.2 t ADT: 9,600
LOCAL
FairOver: CREEK
084E71804, Jackson, IA
Built 1998 Load: 40.2 t ADT: 34
Showing 8,151-8,200 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.