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: LIME CREEK
087102603, Buchanan, IA
Built 1954 Load: 12.6 t ADT: 80
WREN
FairOver: WINNEBAGO RIVER
096193504, Cerro Gordo, IA
Built 1935 Load: 12.6 t ADT: 30
LOCAL
FairOver: EAST SOLDIER RIVER
084400902, Crawford, IA
Built 1945 Load: 12.6 t ADT: 30
LOCAL
FairOver: LINN CREEK
083190501, Marshall, IA
Built 1939 Load: 12.6 t ADT: 21
IA 175
FairOver: STREAM
0.1 mi. W of jct. SR M64, Sac, IA
Built 1937 Load: 12.6 t ADT: 1,930
LOCAL
FairOver: HILTON CREEK
080100804, Iowa, IA
Built 1986 Load: 12.7 t ADT: 34
710TH AVE
FairOver: DRAINAGE
083213402, Story, IA
Built 1959 Load: 12.7 t ADT: 11
270TH ST
FairOver: GRANT 5 OPEN DITCH
083233601, Story, IA
Built 1944 Load: 12.7 t ADT: 40
180TH ST
FairOver: EAST BR INDIAN CREEK
084221301, Story, IA
Built 1955 Load: 12.7 t ADT: 40
610TH AVE
FairOver: WEST BR INDIAN CREEK
084232402, Story, IA
Built 1911 Load: 12.7 t ADT: 34
LOCAL
FairOver: PLATTE BRANCH
068323201, Taylor, IA
Built 1945 Load: 12.7 t ADT: 5
LOCAL ROAD
FairOver: BRANCH FLANK CREEK
074220301, Warren, IA
Built 1960 Load: 12.7 t ADT: 26
WALNUT AVENUE
FairOver: E FORK E NODAWAY RIVER
073322604, Adams, IA
Built 1979 Load: 12.8 t ADT: 71
FM
FairOver: BRUSHY CREEK
080321404, Guthrie, IA
Built 1976 Load: 12.8 t ADT: 26
FM
FairOver: IOWA RIVER
082140406, Tama, IA
Built 1941 Load: 12.8 t ADT: 59
LOCAL
FairOver: CREEK
079340805, Audubon, IA
Built 1900 Load: 12.9 t ADT: 11
FM
FairOver: NORTH RIVER
077293102, Madison, IA
Built 1930 Load: 12.9 t ADT: 50
LOCAL
FairOver: DRAINAGE
071182103, Monroe, IA
Built 1993 Load: 12.9 t ADT: 40
LOCAL
FairOver: MILL CREEK
094410301, O'Brien, IA
Built 1924 Load: 12.9 t ADT: 35
IRONWOOD AVE
FairOver: BUCK CREEK
068382106, Page, IA
Built 1982 Load: 12.9 t ADT: 34
LOCAL
FairOver: E NISHNABOTNA RIVER
079350201, Audubon, IA
Built 1924 Load: 13.0 t ADT: 15
FM 140TH ST
FairOver: SMALL STREAM
090092701, Buchanan, IA
Built 1958 Load: 13.0 t ADT: 147
FM
FairOver: CREEK
072081903, Jefferson, IA
Built 1948 Load: 13.0 t ADT: 25
LOCAL
FairOver: ROCK CR
084172201, Marshall, IA
Built 1950 Load: 13.0 t ADT: 5
LOCAL
FairOver: WILLOW CREEK
081391401, Shelby, IA
Built 1955 Load: 13.0 t ADT: 26
LOCAL
FairOver: SMALL STREAM
081403603, Shelby, IA
Built 1950 Load: 13.0 t ADT: 30
LOCAL
FairOver: BR LONG CREEK
071273504, Clarke, IA
Built 1900 Load: 13.1 t ADT: 20
IA 15
FairOver: PILOT CREEK
At the N jct. of SR C26, Pocahontas, IA
Built 1957 Load: 13.1 t ADT: 510
FM
FairOver: DD #31
087353403, Sac, IA
Built 1919 Load: 13.1 t ADT: 34
M68 DELTA AVE
FairOver: FIELD STREAM
082362202, Carroll, IA
Built 1952 Load: 13.2 t ADT: 100
LOCAL
FairOver: EAST SOLDIER RIVER
084400804, Crawford, IA
Built 1940 Load: 13.2 t ADT: 11
LOCAL
FairOver: SKUNK RIVER
087242405, Hamilton, IA
Built 1952 Load: 13.2 t ADT: 90
290TH ST
FairOver: CREEK
086191101, Hardin, IA
Built 2000 Load: 13.2 t ADT: 69
FM
FairOver: SMALL
081090801, Iowa, IA
Built 1949 Load: 13.2 t ADT: 130
MAGNOLIA ROAD
FairOver: SILVER CREEK
076402101, Pottawattamie, IA
Built 1946 Load: 13.2 t ADT: 5
LOCAL
FairOver: KEG CREEK
079391801, Shelby, IA
Built 1992 Load: 13.2 t ADT: 15
LOCAL
FairOver: SNAKE CREEK
081381702, Shelby, IA
Built 1995 Load: 13.2 t ADT: 21
FM LAWRENCE AVE
FairOver: SMALL STREAM
090091302, Buchanan, IA
Built 1953 Load: 13.3 t ADT: 41
KLAREN RD
FairOver: CREEK
087021601, Dubuque, IA
Built 1941 Load: 13.3 t ADT: 5
FM
FairOver: MAQUOKETA RIVER
084E50404, Jackson, IA
Built 1956 Load: 13.3 t ADT: 610
LOCAL ROAD
FairOver: MUD CREEK
098462701, Lyon, IA
Built 1962 Load: 13.3 t ADT: 62
LOCAL
FairOver: BIG INDIAN CR
068102402, Van Buren, IA
Built 1969 Load: 13.3 t ADT: 62
LOCAL
FairOver: BUTTRICK CREEK
086280702, Webster, IA
Built 1913 Load: 13.3 t ADT: 26
FM
FairOver: FIELD STREAM
082360601, Carroll, IA
Built 1962 Load: 13.4 t ADT: 89
LOCAL
FairOver: HAY CREEK
083370703, Crawford, IA
Built 1999 Load: 13.4 t ADT: 11
ANAMOSA REFORM
FairOver: BUFFALO CREEK
IN QUARRY at ST. REFORM., Jones, IA
Built 1900 Load: 13.4 t
CUMMINGS FD.RD.
FairOver: W OTTER CR
085082411, Linn, IA
Built 1956 Load: 13.4 t ADT: 70
270TH ST
FairOver: CREEK
079353101, Audubon, IA
Built 1957 Load: 13.5 t ADT: 20
LOCAL
FairOver: UNNAMED CREEK
080360705, Audubon, IA
Built 1967 Load: 13.5 t ADT: 15
W AVE
FairOver: LOCAL STREAM
082392901, Crawford, IA
Built 1960 Load: 13.5 t ADT: 5
Showing 1,251-1,300 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.