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
LOCAL
FairOver: MUDDY CREEK
099352701, Dickinson, IA
Built 1962 Load: 26.5 t ADT: 26
LOCAL
FairOver: JACK CR
098323302, Emmet, IA
Built 1960 Load: 26.5 t ADT: 34
NETTLE AVE
FairOver: BUFFALO CREEK
092200502, Franklin, IA
Built 1983 Load: 26.5 t ADT: 20
QUAIL AVE
FairOver: OTTER CR
092201402, Franklin, IA
Built 1966 Load: 26.5 t ADT: 62
FM JONQUIL AVE
FairOver: OTTER CREEK
093211002, Franklin, IA
Built 1980 Load: 26.5 t ADT: 44
LARK AVE
FairOver: OTTER CREEK
093211202, Franklin, IA
Built 1981 Load: 26.5 t ADT: 47
FM
FairOver: SLIPPERY ELM HOLLOW CRK
068421304, Fremont, IA
Built 1985 Load: 26.5 t ADT: 40
NB I-29
FairOver: LITTLE SIOUX RIVER
0.4 MI. N OF JCT. SR F-20, Harrison, IA
Built 1967 Load: 26.5 t ADT: 7,250
SB I-29
FairOver: LITTLE SIOUX RIVER
0.4 MI. N OF JCT. SR F-20, Harrison, IA
Built 1967 Load: 26.5 t ADT: 7,250
HALFMOON AVE
FairOver: BUFFALO CREEK
080072908, Johnson, IA
Built 1976 Load: 26.5 t ADT: 112
LOCAL ROAD
FairOver: ALBERTSON CREEK
098472302, Lyon, IA
Built 2008 Load: 26.5 t ADT: 41
LOCAL
FairOver: HOWERDON CREEK
076292102, Madison, IA
Built 1987 Load: 26.5 t ADT: 20
FA-GASTON AVE
FairOver: STREAM
072420501, Mills, IA
Built 1960 Load: 26.5 t ADT: 678
500TH STREET
FairOver: OVER IAIS RR
076380402, Pottawattamie, IA
Built 1950 Load: 26.5 t ADT: 40
LOCAL
FairOver: STREAM
068311304, Ringgold, IA
Built 1996 Load: 26.5 t ADT: 11
WB US 30
FairOver: BIKE PATH & TRAIL
1.1 MI WEST OF JCT US 69, Story, IA
Built 1971 Load: 26.5 t ADT: 13,950
LOCAL
FairOver: ROCK CREEK
071121109, Wapello, IA
Built 1966 Load: 26.5 t ADT: 35
LOCAL
FairOver: SOUTH AVERY CREEK
072152002, Wapello, IA
Built 1970 Load: 26.5 t ADT: 30
LOCAL
FairOver: EAGLE CREEK
090250504, Wright, IA
Built 1985 Load: 26.5 t ADT: 30
P28 STUART ST
FairOver: CREEK
077300906, Adair, IA
Built 1977 Load: 26.6 t ADT: 1,295
LOCAL
FairOver: PAINT CREEK
097050408, Allamakee, IA
Built 1961 Load: 26.6 t ADT: 78
X20
FairOver: SMALL
099050209, Allamakee, IA
Built 2004 Load: 26.6 t ADT: 690
LOCAL
FairOver: CREEK
080360703, Audubon, IA
Built 1938 Load: 26.6 t ADT: 30
LOCAL
FairOver: STREAM
083090702, Benton, IA
Built 1977 Load: 26.6 t ADT: 39
LOCAL
FairOver: BR PRAIRIE CK
083110702, Benton, IA
Built 1985 Load: 26.6 t ADT: 26
110TH ST
FairOver: SMALL
093141001, Bremer, IA
Built 2009 Load: 26.6 t ADT: 33
BUTLER AV
FairOver: CREEK
093141802, Bremer, IA
Built 1996 Load: 26.6 t ADT: 15
LOCAL
FairOver: SMALL STREAM
089092104, Buchanan, IA
Built 1969 Load: 26.6 t ADT: 73
FM
FairOver: HARTER CREEK
089092701, Buchanan, IA
Built 1964 Load: 26.6 t ADT: 825
FM 140TH ST
FairOver: HUNTER CREEK
090092901, Buchanan, IA
Built 1968 Load: 26.6 t ADT: 108
EB US 20
FairOver: WAPSIPINICON RIVER
1.5 MI. E OF JCT. IA #150, Buchanan, IA
Built 1978 Load: 26.6 t ADT: 4,150
LOCAL
FairOver: BR MAPLE RIVER
091380602, Buena Vista, IA
Built 1973 Load: 26.6 t ADT: 71
T64
FairOver: SMALL STREAM
093150602, Butler, IA
Built 1968 Load: 26.6 t ADT: 776
FM
FairOver: BRUSHY FORK CREEK
083350804, Carroll, IA
Built 1968 Load: 26.6 t ADT: 638
LOCAL - 540TH
FairOver: WATERWAY
074370706, Cass, IA
Built 1977 Load: 26.6 t ADT: 50
FM 450TH ST
FairOver: BEAR CREEK
093412401, Cherokee, IA
Built 1966 Load: 26.6 t ADT: 319
FM 190TH AVE
FairOver: PRAIRIE CREEK
096373402, Clay, IA
Built 1964 Load: 26.6 t ADT: 818
FM 310TH AVE
FairOver: L TRUMBULL OUTLET
097352702, Clay, IA
Built 1970 Load: 26.6 t ADT: 968
FM 270TH AVE
FairOver: MEADOW CREEK
097361302, Clay, IA
Built 1968 Load: 26.6 t ADT: 50
FORESTVILLE RD
FairOver: STREAM
091063504, Clayton, IA
Built 1949 Load: 26.6 t ADT: 560
165TH ST
FairOver: ROBERTS CR
094060103, Clayton, IA
Built 1958 Load: 26.6 t ADT: 108
CONCORD AVE
FairOver: ROBERTS CREEK
095062604, Clayton, IA
Built 1958 Load: 26.6 t ADT: 30
362ND AVENUE
FairOver: SIMMONS CREEK
083E51602, Clinton, IA
Built 1964 Load: 26.6 t ADT: 1,610
FM 195 ST
FairOver: MAQUOKETA RIVER
089051903, Delaware, IA
Built 1969 Load: 26.6 t ADT: 835
LOCAL
FairOver: STONY CREEK
098382701, Dickinson, IA
Built 1974 Load: 26.6 t ADT: 31
FM
FairOver: WHITE WATER CREEK
088013506, Dubuque, IA
Built 1966 Load: 26.6 t ADT: 511
LOCAL
FairOver: SOLDIER CREEK
100322102, Emmet, IA
Built 1978 Load: 26.6 t ADT: 11
306TH ST.
FairOver: DIBBLE CR
095070203, Fayette, IA
Built 1971 Load: 26.6 t ADT: 33
WHITE TAIL RD
FairOver: DRY RUN
095100705, Fayette, IA
Built 1970 Load: 26.6 t ADT: 432
DOGWOOD RD
FairOver: BRUSH CREEK
092072106, Fayette, IA
Built 2021 Load: 26.6 t ADT: 10
Showing 4,601-4,650 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.