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: SMALL STREAM
073132004, Wapello, IA
Built 1986 Load: 32.7 t ADT: 41
FM
FairOver: BRANCH DES MOINES RIVER
073143006, Wapello, IA
Built 1995 Load: 32.7 t ADT: 1,300
FM
FairOver: STREAM
072152706, Wapello, IA
Built 1981 Load: 32.7 t ADT: 70
I 35
FairOver: BROAD HORN CREEK
1.0 MI. N OF SR G-64, Warren, IA
Built 1957 Load: 32.7 t ADT: 21,000
I-35
FairOver: DRAINAGE DITCH
5.7 MI. S OF JCT. IA 92, Warren, IA
Built 1958 Load: 32.7 t ADT: 21,000
LOCAL ROAD
FairOver: WOLF CREEK
074221304, Warren, IA
Built 1994 Load: 32.7 t ADT: 15
FM
FairOver: WINN BRANCH WB CREEK
074222407, Warren, IA
Built 2003 Load: 32.7 t ADT: 500
LOCAL ROAD
FairOver: TURKEY CREEK
074230805, Warren, IA
Built 1975 Load: 32.7 t ADT: 11
FM
FairOver: INDIAN CREEK
074231810, Warren, IA
Built 1983 Load: 32.7 t ADT: 50
FM
FairOver: SKINAWAY CREEK
074242705, Warren, IA
Built 1986 Load: 32.7 t ADT: 499
FM
FairOver: MIDDLE RIVER
075250501, Warren, IA
Built 1976 Load: 32.7 t ADT: 34
LOCAL ROAD
FairOver: BRANCH SOUTH RIVER
075251204, Warren, IA
Built 1977 Load: 32.7 t ADT: 103
LOCAL ROAD
FairOver: BRANCH SOUTH RIVER
076233603, Warren, IA
Built 1975 Load: 32.7 t ADT: 134
LOCAL
FairOver: BRANCH MIDDLE RIVER
077242503, Warren, IA
Built 1988 Load: 32.7 t ADT: 103
G24
FairOver: BRANCH NORTH RIVER
077243101, Warren, IA
Built 1973 Load: 32.7 t ADT: 1,783
40TH AVE
FairOver: MID SOUTH CREEK
077251002, Warren, IA
Built 1983 Load: 32.7 t ADT: 932
CO RD W64
FairOver: BIG SLOUGH CREEK
074060308, Washington, IA
Built 1982 Load: 32.7 t ADT: 220
LOCAL
FairOver: SM STREAM
074071103, Washington, IA
Built 1992 Load: 32.7 t ADT: 15
FM
FairOver: SM STREAM
074092904, Washington, IA
Built 1974 Load: 32.7 t ADT: 180
LOCAL
FairOver: SMALL STREAM
074093004, Washington, IA
Built 1987 Load: 32.7 t ADT: 50
FM
FairOver: BURR OAK CREEK
074093604, Washington, IA
Built 1991 Load: 32.7 t ADT: 1,100
LOCAL ROAD
FairOver: CEDAR CREEK
075073103, Washington, IA
Built 1999 Load: 32.7 t ADT: 50
FM
FairOver: CLEMONS CREEK
075080502, Washington, IA
Built 1990 Load: 32.7 t ADT: 260
LOCAL ROAD
FairOver: CLEMONS CREEK
075080801, Washington, IA
Built 1991 Load: 32.7 t ADT: 20
LOCAL
FairOver: SMALL STREAM
075082202, Washington, IA
Built 1987 Load: 32.7 t ADT: 26
FM
FairOver: DAVIS CREEK
077063204, Washington, IA
Built 1994 Load: 32.7 t ADT: 80
LOCAL ROAD
FairOver: SMALL STREAM
077081503, Washington, IA
Built 1988 Load: 32.7 t ADT: 71
FM
FairOver: SOUTH ENGLISH RIVER
077090706, Washington, IA
Built 1993 Load: 32.7 t ADT: 50
S60 235TH ST
FairOver: SMALL NATURAL STREAM
068201412, Wayne, IA
Built 1957 Load: 32.7 t ADT: 980
LOCAL
FairOver: BRANCH OF LOCUST CREEK
067201005, Wayne, IA
Built 1978 Load: 32.7 t ADT: 26
LOCAL
FairOver: STREAM
067212401, Wayne, IA
Built 1988 Load: 32.7 t ADT: 20
FM
FairOver: MEDICINE CREEK
067221101, Wayne, IA
Built 1996 Load: 32.7 t ADT: 110
LOCAL
FairOver: LITTLE MUDDY
067231505, Wayne, IA
Built 1990 Load: 32.7 t ADT: 20
FM
FairOver: GRAND RIVER
067232203, Wayne, IA
Built 1998 Load: 32.7 t ADT: 80
FM
FairOver: FORK WALNUT CREEK
068200303, Wayne, IA
Built 1987 Load: 32.7 t ADT: 20
FM
FairOver: SMALL STREAM
068231105, Wayne, IA
Built 1972 Load: 32.7 t ADT: 230
140TH ST
FairOver: JACKSON CREEK
069212904, Wayne, IA
Built 1988 Load: 32.7 t ADT: 130
FM
FairOver: STEELE STREAM
069230506, Wayne, IA
Built 1977 Load: 32.7 t ADT: 15
FM
FairOver: SMALL
070202602, Wayne, IA
Built 1983 Load: 32.7 t ADT: 310
LOCAL (OLD IA 2
FairOver: S CHARITON RIVER
069222801, Wayne, IA
Built 1999 Load: 32.7 t ADT: 90
D 36
FairOver: SPRING CREEK
088301401, Webster, IA
Built 1984 Load: 32.7 t ADT: 1,547
D20 200TH ST
FairOver: BRUSHY CREEK
089272601, Webster, IA
Built 1977 Load: 32.7 t ADT: 2,384
LOCAL
FairOver: BUTTRICK CREEK
086292201, Webster, IA
Built 1993 Load: 32.7 t ADT: 35
FM
FairOver: HOLIDAY CREEK
088281007, Webster, IA
Built 1974 Load: 32.7 t ADT: 538
FM
FairOver: BADGER CREEK
090282904, Webster, IA
Built 1993 Load: 32.7 t ADT: 2,035
US 52
FairOver: DRY RUN
0.3 mi. N of Jct. Iowa #9, Winneshiek, IA
Built 1963 Load: 32.7 t ADT: 4,230
FM
FairOver: TANGEN CREEK
096082804, Winneshiek, IA
Built 1935 Load: 32.7 t ADT: 59
LOCAL
FairOver: CREEK
096090101, Winneshiek, IA
Built 1977 Load: 32.7 t ADT: 78
LOCAL ROAD
FairOver: CREEK
096101501, Winneshiek, IA
Built 1900 Load: 32.7 t ADT: 39
LOCAL ROAD
FairOver: CREEK
096102501, Winneshiek, IA
Built 1975 Load: 32.7 t ADT: 33
Showing 7,001-7,050 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.