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: BRUSHY STREAM
081330701, Guthrie, IA
Built 1972 Load: 19.4 t ADT: 50
LOCAL
FairOver: STREAM
084E21105, Jackson, IA
Built 1998 Load: 19.4 t ADT: 157
SE 660TH ST
FairOver: PRAIRIE CR
077052901, Johnson, IA
Built 1930 Load: 19.4 t ADT: 26
W 295TH ST
FairOver: BR CLEAR CR
080081903, Johnson, IA
Built 1977 Load: 19.4 t ADT: 60
140TH ST NW
FairOver: KNAPP CREEK
081081601, Johnson, IA
Built 1987 Load: 19.4 t ADT: 50
LOCAL RD
FairOver: CLANTON CREEK
074271007, Madison, IA
Built 1974 Load: 19.4 t ADT: 20
FM
FairOver: MIDDLE RIVER
075281510, Madison, IA
Built 1981 Load: 19.4 t ADT: 180
LOCAL
FairOver: CLEAR CREEK
082203303, Marshall, IA
Built 1971 Load: 19.4 t ADT: 35
FM
FairOver: WHITE CREEK
072190103, Monroe, IA
Built 1961 Load: 19.4 t ADT: 25
LOCAL
FairOver: WALNUT CREEK
073382002, Montgomery, IA
Built 1984 Load: 19.4 t ADT: 26
LOCAL
FairOver: OCHEYEDAN RIVER
097390102, O'Brien, IA
Built 1933 Load: 19.4 t ADT: 30
LOCAL RD
FairOver: LITTLE FLOYD RIVER
097412802, O'Brien, IA
Built 1959 Load: 19.4 t ADT: 50
LOCAL
FairOver: STREAM
095340201, Palo Alto, IA
Built 2004 Load: 19.4 t ADT: 30
FM
FairOver: GRAYBILL CREEK
074402501, Pottawattamie, IA
Built 1956 Load: 19.4 t ADT: 100
E. 32ND ST
FairOver: PHEASANT CREEK
000000000, Scott, IA
Built 1987 Load: 19.4 t ADT: 1,802
100TH ST
FairOver: LONG DICK CREEK
085230301, Story, IA
Built 1955 Load: 19.4 t ADT: 45
100TH ST
FairOver: LONG DICK CREEK
085230301, Story, IA
Built 1955 Load: 19.4 t ADT: 45
LOCAL
FairOver: SUGAR CREEK
083160408, Tama, IA
Built 1920 Load: 19.4 t ADT: 44
LOCAL
FairOver: WEST 102 RIVER
069350309, Taylor, IA
Built 1987 Load: 19.4 t ADT: 20
FM
FairOver: LITTLE FOX RIVER
067111204, Van Buren, IA
Built 1953 Load: 19.4 t ADT: 70
LOCAL
FairOver: REED'S CR
069082601, Van Buren, IA
Built 1940 Load: 19.4 t ADT: 51
LOCAL
FairOver: CREEK
070082201, Van Buren, IA
Built 1937 Load: 19.4 t ADT: 5
LOCAL ROAD
FairOver: OTTER CREEK
075230904, Warren, IA
Built 1969 Load: 19.4 t ADT: 51
LOCAL
FairOver: FORK DICK CREEK
069221801, Wayne, IA
Built 1987 Load: 19.4 t ADT: 30
FM
FairOver: BOONE RIVER
090260901, Wright, IA
Built 1974 Load: 19.4 t ADT: 71
250TH ST
FairOver: BOONE RIVER
091261705, Wright, IA
Built 1974 Load: 19.4 t ADT: 90
LOCAL
FairOver: BOONE RIVER
091261805, Wright, IA
Built 1978 Load: 19.4 t ADT: 62
LOCAL
FairOver: SMALL STREAM
088072703, Buchanan, IA
Built 2005 Load: 19.5 t ADT: 39
FM
FairOver: SMALL STREAM
092181105, Butler, IA
Built 1953 Load: 19.5 t ADT: 34
LOCAL
FairOver: PURGATORY CREEK
085332503, Carroll, IA
Built 1900 Load: 19.5 t
FM
FairOver: DICKENSON BRANCH
067261104, Decatur, IA
Built 1963 Load: 19.5 t ADT: 329
283 RD
FairOver: RACCOON RIVER
082300103, Greene, IA
Built 1937 Load: 19.5 t ADT: 50
W AVE / P46
FairOver: WEST BEAVER CREEK
083290204, Greene, IA
Built 1924 Load: 19.5 t ADT: 329
LOCAL
FairOver: LONG DICK CR
086231601, Hamilton, IA
Built 1955 Load: 19.5 t ADT: 15
LOCAL
FairOver: LONG DICK CR
086232101, Hamilton, IA
Built 1955 Load: 19.5 t ADT: 26
LOCAL
FairOver: KEIGLEY CREEK
086243002, Hamilton, IA
Built 1955 Load: 19.5 t ADT: 20
LOCAL
FairOver: KEIGLEY CR
086243202, Hamilton, IA
Built 1954 Load: 19.5 t ADT: 15
FM
FairOver: SKUNK RIVER
087241201, Hamilton, IA
Built 1955 Load: 19.5 t ADT: 26
LOCAL
FairOver: SKUNK RIVER
087241202, Hamilton, IA
Built 1955 Load: 19.5 t ADT: 20
LOCAL
FairOver: BITTER CREEK
089411704, Ida, IA
Built 1967 Load: 19.5 t ADT: 41
FM
FairOver: WALNUT CREEK
073082704, Jefferson, IA
Built 1936 Load: 19.5 t ADT: 360
25TH AVE
FairOver: LOSS CREEK
086011105, Jones, IA
Built 1967 Load: 19.5 t ADT: 11
FM
FairOver: BIG CEDAR CREEK
090342704, Pocahontas, IA
Built 1964 Load: 19.5 t ADT: 649
LOCAL ROAD
FairOver: OLD CHANNEL
081223201, Polk, IA
Built 1969 Load: 19.5 t ADT: 60
FM
FairOver: SMALL CREEK
088370802, Sac, IA
Built 1919 Load: 19.5 t ADT: 26
260TH ST
FairOver: CLEAR CREEK
083212501, Story, IA
Built 1968 Load: 19.5 t ADT: 40
LOCAL
FairOver: RICHLAND CREEK
082141407, Tama, IA
Built 1920 Load: 19.5 t ADT: 33
LOCAL
FairOver: MIDDLE 102 RIVER
068340302, Taylor, IA
Built 1945 Load: 19.5 t ADT: 5
FM
FairOver: WEST 102 RIVER
068352705, Taylor, IA
Built 1956 Load: 19.5 t ADT: 15
LOCAL ROAD
FairOver: LIME STONE CREEK
074252101, Warren, IA
Built 1974 Load: 19.5 t ADT: 5
Showing 2,451-2,500 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.