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
I-480 & US 6
FairOver: MISSOURI RIVER & RR
OVER MISSOURI RIVER, Pottawattamie, IA
Built 1966 Load: 15.4 t ADT: 53,700
LOCAL
FairOver: W. NISHNABOTNA RIVER
081370303, Shelby, IA
Built 1955 Load: 15.4 t ADT: 26
730TH AVE
FairOver: CLEAR CREEK
083212402, Story, IA
Built 1931 Load: 15.4 t ADT: 40
LOCAL
FairOver: BRUSHY FORK CREEK
082341703, Carroll, IA
Built 1971 Load: 15.5 t ADT: 15
LOCAL
FairOver: EAST LONG CREEK
071272603, Clarke, IA
Built 1977 Load: 15.5 t ADT: 5
145TH ST
FairOver: ROBERTS CREEK
095062605, Clayton, IA
Built 1953 Load: 15.5 t ADT: 59
FM
FairOver: STREAM
068262601, Decatur, IA
Built 1968 Load: 15.5 t ADT: 20
E 124TH ST S
FairOver: SMALL STREAM
079170904, Jasper, IA
Built 1988 Load: 15.5 t ADT: 11
LOCAL
FairOver: CEDAR CREEK
076260908, Madison, IA
Built 1958 Load: 15.5 t ADT: 34
LOCAL
FairOver: OCHEYEDAN RIVER
099400502, Osceola, IA
Built 1954 Load: 15.5 t ADT: 21
250TH ST
FairOver: DRAINAGE
091472103, Plymouth, IA
Built 1978 Load: 15.5 t ADT: 15
190TH ST
FairOver: WESTFIELD CREEK
092492404, Plymouth, IA
Built 1962 Load: 15.5 t ADT: 15
150TH ST
FairOver: W BR FLOYD RIVER
093453101, Plymouth, IA
Built 1963 Load: 15.5 t ADT: 50
LOCAL
FairOver: CREEK
078361704, Audubon, IA
Built 1950 Load: 15.6 t ADT: 21
JUPITER RD
FairOver: WAYMAN CREEK
092043618, Clayton, IA
Built 1951 Load: 15.6 t ADT: 246
CHARIOT RD
FairOver: STREAM
094062705, Clayton, IA
Built 1954 Load: 15.6 t ADT: 34
140TH ST
FairOver: HONEY CREEK
090052701, Delaware, IA
Built 1925 Load: 15.6 t ADT: 30
FM
FairOver: CREEK
084E52204, Jackson, IA
Built 1978 Load: 15.6 t ADT: 45
LOCAL ROAD
FairOver: DRAINAGE DITCH
081221905, Polk, IA
Built 1967 Load: 15.6 t ADT: 40
LOCAL
FairOver: CREEK
0693206, Taylor, IA
Built 1958 Load: 15.6 t ADT: 11
410TH
FairOver: SHELLROCK RIVER
099203501, Worth, IA
Built 1955 Load: 15.6 t ADT: 471
LOCAL
FairOver: MIDDLE RIVER
077320201, Adair, IA
Built 1953 Load: 15.7 t ADT: 60
FM-150TH STREET
FairOver: SHOW CREEK
073353601, Adams, IA
Built 1958 Load: 15.7 t ADT: 40
LOCAL RD
FairOver: YELLOW RIVER
096061204, Allamakee, IA
Built 1954 Load: 15.7 t ADT: 39
FM
FairOver: SMALL STREAM
069182003, Appanoose, IA
Built 1948 Load: 15.7 t ADT: 70
FM
FairOver: FIELD STREAM
084361302, Carroll, IA
Built 1900 Load: 15.7 t ADT: 71
FM
FairOver: SUGAR CREEK
080020805, Cedar, IA
Built 1946 Load: 15.7 t ADT: 80
230 STREET
FairOver: STREAM
068401601, Fremont, IA
Built 1969 Load: 15.7 t ADT: 31
LOCAL
FairOver: BRANCH BEAR CREEK
087183202, Grundy, IA
Built 1954 Load: 15.7 t ADT: 39
FM
FairOver: DOWD CREEK
087183402, Grundy, IA
Built 1956 Load: 15.7 t ADT: 29
LOCAL
FairOver: BRANCH BEAVER CREEK
088180804, Grundy, IA
Built 1956 Load: 15.7 t ADT: 78
LOCAL
FairOver: BRANCH BEAVER CREEK
088181002, Grundy, IA
Built 1955 Load: 15.7 t ADT: 15
LOCAL ROAD
FairOver: MIDDLE FORK BEAVER CREEK
089172802, Grundy, IA
Built 1957 Load: 15.7 t ADT: 15
FM
FairOver: BEAVER CREEK ,SOUTH FORK
089173301, Grundy, IA
Built 1956 Load: 15.7 t ADT: 20
LOCAL
FairOver: BRANCH BEAVER CREEK
089181702, Grundy, IA
Built 1957 Load: 15.7 t ADT: 44
FM
FairOver: BEAVER CREEK ,BRANCH
089182001, Grundy, IA
Built 1954 Load: 15.7 t ADT: 79
LOCAL
FairOver: MUD CREEK
072071604, Henry, IA
Built 1953 Load: 15.7 t ADT: 62
135TH ST
FairOver: CRANE CREEK
098131103, Howard, IA
Built 1951 Load: 15.7 t ADT: 20
LOCAL
FairOver: SMALL STREAM
081122802, Iowa, IA
Built 1952 Load: 15.7 t ADT: 30
FM
FairOver: STUMP CREEK
071113004, Jefferson, IA
Built 1952 Load: 15.7 t ADT: 110
LOCAL
FairOver: TRIB S FORK ENGLISH RVR
077112003, Keokuk, IA
Built 1951 Load: 15.7 t ADT: 26
FM
FairOver: WHITE BREAST CREEK
072220503, Lucas, IA
Built 1954 Load: 15.7 t ADT: 50
FM
FairOver: SOUTH OTTER CREEK
073232109, Lucas, IA
Built 1957 Load: 15.7 t ADT: 40
FM
FairOver: CLANTON CREEK
075263207, Madison, IA
Built 1956 Load: 15.7 t ADT: 71
FM
FairOver: MUCHAKINOCK CR
074160203, Mahaska, IA
Built 1960 Load: 15.7 t ADT: 80
FM
FairOver: DRAINAGE DITCH #2
074160403, Mahaska, IA
Built 1951 Load: 15.7 t ADT: 40
LOCAL
FairOver: N COAL CREEK
074170905, Mahaska, IA
Built 1961 Load: 15.7 t ADT: 11
LOCAL
FairOver: DRAINAGE
074171904, Mahaska, IA
Built 1955 Load: 15.7 t ADT: 60
FM
FairOver: BALLINGER CREEK
076170205, Mahaska, IA
Built 1960 Load: 15.7 t ADT: 35
LOCAL
FairOver: DRAINAGE
077151003, Mahaska, IA
Built 1973 Load: 15.7 t ADT: 15
Showing 1,501-1,550 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.