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: WILLOW CREEK
093442101, Plymouth, IA
Built 1967 Load: 30.4 t ADT: 589
FM
FairOver: WILLOW CREEK
093442102, Plymouth, IA
Built 1968 Load: 30.4 t ADT: 748
FM
FairOver: DRAINAGE DITCH NO. 22
090312902, Pocahontas, IA
Built 1970 Load: 30.4 t ADT: 828
LOCAL
FairOver: DD NO. 22
090321601, Pocahontas, IA
Built 1976 Load: 30.4 t ADT: 11
LOCAL
FairOver: LIZARD CREEK DD #53
091311902, Pocahontas, IA
Built 1977 Load: 30.4 t ADT: 11
LOCAL
FairOver: LIZARD CREEK
091313001, Pocahontas, IA
Built 1976 Load: 30.4 t ADT: 15
LOCAL
FairOver: DD #53 LIZARD CK
091321002, Pocahontas, IA
Built 1977 Load: 30.4 t ADT: 45
FM
FairOver: LIZARD CK DD #53
091321402, Pocahontas, IA
Built 1975 Load: 30.4 t ADT: 26
FM
FairOver: LITTLE CEDAR CK DD #181
091343203, Pocahontas, IA
Built 1971 Load: 30.4 t ADT: 679
FM
FairOver: DD #181 BIG BEAR CK
091343501, Pocahontas, IA
Built 1973 Load: 30.4 t ADT: 589
FM
FairOver: NO LIZARD CK DD #77
092320701, Pocahontas, IA
Built 1978 Load: 30.4 t ADT: 30
FM
FairOver: BEAVER CREEK
093320102, Pocahontas, IA
Built 1973 Load: 30.4 t ADT: 26
LOCAL
FairOver: PILOT CREEK
093321602, Pocahontas, IA
Built 1977 Load: 30.4 t ADT: 80
FM
FairOver: PILOT CREEK
093322502, Pocahontas, IA
Built 1975 Load: 30.4 t ADT: 20
LOCAL
FairOver: PILOT CREEK
093322602, Pocahontas, IA
Built 1977 Load: 30.4 t ADT: 30
LOCAL
FairOver: PILOT CREEK
093322701, Pocahontas, IA
Built 1977 Load: 30.4 t ADT: 30
FM
FairOver: N LIZARD CK DD #77
093332602, Pocahontas, IA
Built 1977 Load: 30.4 t ADT: 100
LOCAL
FairOver: N LIZARD CREEK
093332701, Pocahontas, IA
Built 1972 Load: 30.4 t ADT: 26
LOCAL
FairOver: N LIZARD CK DD #77
093333604, Pocahontas, IA
Built 1972 Load: 30.4 t ADT: 80
LOCAL
FairOver: DD #41 BIG CEDAR CK
093343401, Pocahontas, IA
Built 1977 Load: 30.4 t ADT: 330
US 6
FairOver: SILVER CREEK
1.0 MI. E OF SR L66, Pottawattamie, IA
Built 1961 Load: 30.4 t ADT: 2,770
FM
FairOver: FARM CREEK
074392801, Pottawattamie, IA
Built 1963 Load: 30.4 t ADT: 71
HONEYSUCKLE RD
FairOver: SLOCUM CREEK
075401103, Pottawattamie, IA
Built 1961 Load: 30.4 t ADT: 548
ORCHARD ROAD
FairOver: LITTLE MOSQUITO
075432804, Pottawattamie, IA
Built 1973 Load: 30.4 t ADT: 1,047
FM-MAHOGANY RD
FairOver: GREYBILL CREEK
076391301, Pottawattamie, IA
Built 1961 Load: 30.4 t ADT: 300
MAHOGANY ROAD
FairOver: BRANCH OF SILVER CREEK
076401603, Pottawattamie, IA
Built 1961 Load: 30.4 t ADT: 349
FM-WESTGATE RD
FairOver: PIGEON CREEK
077421703, Pottawattamie, IA
Built 1972 Load: 30.4 t ADT: 50
LOCAL
FairOver: STREAM
079152901, Poweshiek, IA
Built 2003 Load: 30.4 t ADT: 50
FM
FairOver: W FK GRAND RIVER
067310206, Ringgold, IA
Built 1979 Load: 30.4 t ADT: 270
300TH ST
FairOver: CREEK
080E41701, Scott, IA
Built 1970 Load: 30.4 t ADT: 1,390
FM
FairOver: E BR W NISHNABOTNA RIVER
079370602, Shelby, IA
Built 1972 Load: 30.4 t ADT: 588
B40
FairOver: FLOYD RIVER
095431001, Sioux, IA
Built 1977 Load: 30.4 t ADT: 1,795
FM
FairOver: DRY CREEK
096462102, Sioux, IA
Built 1967 Load: 30.4 t ADT: 1,077
LOCAL
FairOver: TWELVE MILE CREEK
086142906, Tama, IA
Built 2006 Load: 30.4 t ADT: 20
ALBIA RD
FairOver: BEAR CREEK
072142704, Wapello, IA
Built 1967 Load: 30.4 t ADT: 810
FM
FairOver: COTTON CREEK
074222704, Warren, IA
Built 1969 Load: 30.4 t ADT: 400
LOCAL ROAD
FairOver: DEER CREEK
077080403, Washington, IA
Built 1966 Load: 30.4 t ADT: 60
FM
FairOver: WOLF CREEK
0874414, Woodbury, IA
Built 1967 Load: 30.4 t ADT: 71
FM
FairOver: WOLF CREEK
0874415, Woodbury, IA
Built 1967 Load: 30.4 t ADT: 71
FM
FairOver: WRIGHT CREEK
088422102, Woodbury, IA
Built 1968 Load: 30.4 t ADT: 379
FM
FairOver: WOLF CREEK
088440503, Woodbury, IA
Built 1967 Load: 30.4 t ADT: 359
FM
FairOver: WHITE FOX CREEK
090253502, Wright, IA
Built 1967 Load: 30.4 t ADT: 26
FM
FairOver: UPPER IOWA RIVER
099060806, Allamakee, IA
Built 1974 Load: 30.5 t ADT: 69
FM
FairOver: SOUTH RIVER
073271204, Clarke, IA
Built 1968 Load: 30.5 t ADT: 29
US 30 WB
FairOver: UP RR
5.8 MI. E OF S JCT. US 61, Clinton, IA
Built 1974 Load: 30.5 t ADT: 4,500
IA 2
FairOver: W BRANCH LITTLE RIVER
1.2 MI. W OF W JCT. US 69, Decatur, IA
Built 1986 Load: 30.5 t ADT: 1,960
FM 150 ST
FairOver: HONEY CREEK
090053501, Delaware, IA
Built 1949 Load: 30.5 t ADT: 363
BUTTERFIELD RD.
FairOver: FARM CREEK
086021106, Jones, IA
Built 1974 Load: 30.5 t ADT: 176
IA 21
FairOver: ENGLISH RIVER
2.3 mi. N of Jct. IA. 22, Keokuk, IA
Built 1984 Load: 30.5 t ADT: 1,490
LINN-BENTON RD
FairOver: TRIB TO KNAPP CREEK
Benton-Linn Road, Linn, IA
Built 1972 Load: 30.5 t ADT: 1,530
Showing 5,701-5,750 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.