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: DRAINAGE
077172004, Mahaska, IA
Built 1955 Load: 15.7 t ADT: 20
LOCAL
FairOver: DRAINAGE
077173609, Mahaska, IA
Built 1955 Load: 15.7 t ADT: 50
LOCAL
FairOver: STREAM
074190104, Marion, IA
Built 1960 Load: 15.7 t ADT: 145
FM
FairOver: ELK CREEK
082432405, Monona, IA
Built 1955 Load: 15.7 t ADT: 40
FM
FairOver: MOFFAT BRANCH
071182006, Monroe, IA
Built 1950 Load: 15.7 t ADT: 80
FM
FairOver: STREAM
071191103, Monroe, IA
Built 1959 Load: 15.7 t ADT: 140
LOCAL
FairOver: OCHEYDAN RIVER
098392001, Osceola, IA
Built 1954 Load: 15.7 t ADT: 21
270TH STREET
FairOver: WEST MILL CREEK
067370501, Page, IA
Built 1957 Load: 15.7 t ADT: 26
290TH STREET
FairOver: WEST MILL CREEK
067381301, Page, IA
Built 1957 Load: 15.7 t ADT: 79
170TH STREET
FairOver: EAST TARKIO CREEK
069370701, Page, IA
Built 1956 Load: 15.7 t ADT: 26
FM-IDELWOOD RD
FairOver: KEG CREEK
075420101, Pottawattamie, IA
Built 1958 Load: 15.7 t ADT: 45
FM-152ND STREET
FairOver: HONEY CREEK
077443404, Pottawattamie, IA
Built 1959 Load: 15.7 t ADT: 100
FM
FairOver: E FORK GRAND RIVER
069291301, Ringgold, IA
Built 1957 Load: 15.7 t ADT: 50
LOCAL
FairOver: CROOKED CREEK
069303205, Ringgold, IA
Built 1957 Load: 15.7 t ADT: 50
FM
FairOver: PLATTE RIVER
070312101, Ringgold, IA
Built 1961 Load: 15.7 t ADT: 29
LOCAL
FairOver: MIDDLE RIVER
074332603, Adair, IA
Built 1920 Load: 15.8 t ADT: 30
LOCAL
FairOver: LONG CREEK
069260503, Decatur, IA
Built 1984 Load: 15.8 t ADT: 21
240 AVENUE
FairOver: COOPER CREEK
068431202, Fremont, IA
Built 1990 Load: 15.8 t ADT: 5
LOCAL
FairOver: HONEY CREEK
087222501, Hardin, IA
Built 1983 Load: 15.8 t ADT: 15
TEAKWOOD ROAD
FairOver: POTATO CREEK
077432401, Pottawattamie, IA
Built 1946 Load: 15.8 t ADT: 45
FM
FairOver: SMALL STREAM
086370802, Sac, IA
Built 1930 Load: 15.8 t ADT: 50
US 18
FairOver: DRAINAGE DITCH
0.1 mi E of SR K18, Sioux, IA
Built 1944 Load: 15.8 t ADT: 3,040
ORANGE AVENUE
FairOver: KEMP CREEK
073332702, Adams, IA
Built 1956 Load: 15.9 t ADT: 15
LOCAL
FairOver: SMALL STREAM
099052210, Allamakee, IA
Built 1975 Load: 15.9 t ADT: 26
FM
FairOver: FIELD STREAM
084342302, Carroll, IA
Built 1964 Load: 15.9 t ADT: 687
FM
FairOver: SUGAR CR
079023401, Cedar, IA
Built 1945 Load: 15.9 t ADT: 90
LOCL MIDDLE RD
FairOver: MILL CREEK
093403004, Cherokee, IA
Built 1964 Load: 15.9 t ADT: 30
290TH ST
FairOver: COON CREEK
092050701, Clayton, IA
Built 1920 Load: 15.9 t ADT: 82
LOCAL 120 AVE
FairOver: BUFFALO CREEK OVERFLOW
087062804, Delaware, IA
Built 2003 Load: 15.9 t ADT: 44
LOCAL
FairOver: W FORK DES MOINES RIVER
098332903, Emmet, IA
Built 1959 Load: 15.9 t ADT: 34
LOCAL
FairOver: BRANCH BLACKHAWK CREEK
088171202, Grundy, IA
Built 1957 Load: 15.9 t ADT: 26
LOCAL
FairOver: BRANCH BEAVER CREEK
089160401, Grundy, IA
Built 1955 Load: 15.9 t ADT: 20
LOCAL
FairOver: BRANCH BLACKHAWK CREEK
089163601, Grundy, IA
Built 1956 Load: 15.9 t ADT: 20
FM
FairOver: BEAR CREEK
087193502, Hardin, IA
Built 1986 Load: 15.9 t ADT: 20
FM
FairOver: S FORK MAQUOKETA RIVER
085E11905, Jackson, IA
Built 1954 Load: 15.9 t ADT: 510
FM
FairOver: LUX CREEK
087E40707, Jackson, IA
Built 1961 Load: 15.9 t ADT: 430
FM
FairOver: DEVIL CREEK
068053004, Lee, IA
Built 1944 Load: 15.9 t ADT: 45
DUROW RD
FairOver: BLUE CREEK
086083105, Linn, IA
Built 1951 Load: 15.9 t ADT: 148
LOCAL
FairOver: ST JOSEPHS CREEK
074160605, Mahaska, IA
Built 1953 Load: 15.9 t ADT: 80
LOCAL
FairOver: S COAL CREEK
074171112, Mahaska, IA
Built 1959 Load: 15.9 t ADT: 40
FM
FairOver: TURKEY RUN
074171506, Mahaska, IA
Built 1952 Load: 15.9 t ADT: 35
FM
FairOver: S COAL CREEK
074172004, Mahaska, IA
Built 1954 Load: 15.9 t ADT: 100
FM
FairOver: MIDDLE CREEK
077162202, Mahaska, IA
Built 1963 Load: 15.9 t ADT: 25
LOCAL
FairOver: STREAM
074212404, Marion, IA
Built 1960 Load: 15.9 t ADT: 62
FM
FairOver: STREAM
085442212, Monona, IA
Built 1956 Load: 15.9 t ADT: 71
FM
FairOver: CREEK
071182705, Monroe, IA
Built 1959 Load: 15.9 t ADT: 20
LOCAL ROAD
FairOver: WALNUT CREEK
073380401, Montgomery, IA
Built 1967 Load: 15.9 t ADT: 26
FM
FairOver: BIG CEDAR CK DD #41
091330702, Pocahontas, IA
Built 1959 Load: 15.9 t ADT: 60
310TH ST
FairOver: BALLARD CREEK
082242001, Story, IA
Built 1970 Load: 15.9 t ADT: 50
FM
FairOver: LITTLE WOLF CREEK
086160704, Tama, IA
Built 1955 Load: 15.9 t ADT: 49
Showing 1,551-1,600 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.