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
PoorOver: TRIBUTARY BEAVER CREEK
084283202, Boone, IA
Built 1962 Load: 29.9 t ADT: 80
190TH ST
PoorOver: BASKINS CREEK
092131901, Bremer, IA
Built 1971 Load: 29.9 t ADT: 1,149
FM
PoorOver: MOSQUITO CREEK
087152902, Grundy, IA
Built 1977 Load: 29.9 t ADT: 501
FM
PoorOver: BLACKHAWK CREEK
088173602, Grundy, IA
Built 1971 Load: 29.9 t ADT: 1,935
320TH
PoorOver: FISH CREEK
097161301, Mitchell, IA
Built 1965 Load: 29.9 t ADT: 226
FM
PoorOver: BEAR CREEK
080140902, Poweshiek, IA
Built 1979 Load: 29.9 t ADT: 130
OLIVE
PoorOver: DRAINAGE DITCH
098202804, Worth, IA
Built 1974 Load: 29.9 t ADT: 51
FM
PoorOver: WHITE FOX CREEK
091243101, Wright, IA
Built 1963 Load: 29.9 t ADT: 742
FM
PoorOver: MUD CREEK
084112101, Benton, IA
Built 1955 Load: 30.0 t ADT: 200
FM
PoorOver: ROCK CREEK
086122401, Benton, IA
Built 1985 Load: 30.0 t ADT: 430
190TH ST
PoorOver: BUCK CREEK
092112103, Bremer, IA
Built 1976 Load: 30.0 t ADT: 727
FM
PoorOver: LANDPHERE CREEK
091153204, Butler, IA
Built 1972 Load: 30.0 t ADT: 890
FM
PoorOver: E CEDAR CREEK
087312103, Calhoun, IA
Built 1970 Load: 30.0 t ADT: 180
FM
PoorOver: W BR LITTLE SIOUX
100381301, Dickinson, IA
Built 1977 Load: 30.0 t ADT: 61
FM
PoorOver: ASHTON CREEK
089411202, Ida, IA
Built 1974 Load: 30.0 t ADT: 290
HIGHWAY F-70 W
PoorOver: WALNUT CREEK
078213401, Jasper, IA
Built 1971 Load: 30.0 t ADT: 540
FM
PoorOver: WAPSI CREEK
078040110, Muscatine, IA
Built 1971 Load: 30.0 t ADT: 3,080
296TH ST
PoorOver: CREEK
080E11305, Scott, IA
Built 1974 Load: 30.0 t ADT: 200
FM
PoorOver: EAST PLATTE RIVER
071301701, Union, IA
Built 1963 Load: 30.0 t ADT: 199
FM
PoorOver: DD NO 69
088301201, Webster, IA
Built 1974 Load: 30.0 t ADT: 339
FM
PoorOver: SOLDIER CR (DD NO 247)
089280905, Webster, IA
Built 1974 Load: 30.0 t ADT: 2,364
C54 265TH ST
PoorOver: DRAINAGE
091242505, Wright, IA
Built 1976 Load: 30.0 t ADT: 569
FM
PoorOver: INDIAN CREEK
094471301, Sioux, IA
Built 1965 Load: 30.1 t ADT: 469
B46
PoorOver: NO NAME CREEK
095472101, Sioux, IA
Built 1966 Load: 30.1 t ADT: 538
FM
PoorOver: BIG CREEK
088433306, Woodbury, IA
Built 1964 Load: 30.1 t ADT: 270
290TH ST
PoorOver: CREEK
078340305, Audubon, IA
Built 1940 Load: 30.2 t ADT: 15
212TH ST
PoorOver: DRY RUN CREEK
093140202, Bremer, IA
Built 1977 Load: 30.2 t ADT: 226
FM
PoorOver: LAKE CR.
087321901, Calhoun, IA
Built 1978 Load: 30.2 t ADT: 359
LOCAL
PoorOver: CAMP CK
087342101, Calhoun, IA
Built 1973 Load: 30.2 t ADT: 279
FM - OXFORD
PoorOver: SEVEN MILE CREEK
075351501, Cass, IA
Built 1974 Load: 30.2 t ADT: 139
W AVE
PoorOver: CREEK
082293504, Greene, IA
Built 1900 Load: 30.2 t ADT: 21
FM
PoorOver: MOSQUITO CREEK
081310202, Guthrie, IA
Built 1978 Load: 30.2 t ADT: 159
LOC 210TH AVE
PoorOver: BUFFALO CREEK
097270402, Kossuth, IA
Built 1971 Load: 30.2 t ADT: 143
FM
PoorOver: SUGAR CREEK
066061403, Lee, IA
Built 1976 Load: 30.2 t ADT: 650
LOCAL
PoorOver: WATERWAY
077270303, Madison, IA
Built 1950 Load: 30.2 t ADT: 40
FM
PoorOver: MUD CREEK
078E10604, Muscatine, IA
Built 1972 Load: 30.2 t ADT: 1,600
FM
PoorOver: OVERFLOW FROM SUGAR CRK
078020924, Muscatine, IA
Built 1971 Load: 30.2 t ADT: 1,640
LOCAL
PoorOver: KIBBE CREEK
084141002, Tama, IA
Built 1991 Load: 30.2 t ADT: 49
S 40
PoorOver: DRAINAGE
068211502, Wayne, IA
Built 1972 Load: 30.2 t ADT: 680
FM
PoorOver: SOUTH LIZARD CREEK
089292605, Webster, IA
Built 1975 Load: 30.2 t ADT: 230
ZANETA RD
PoorOver: BLACK HAWK CREEK
88-14-33-03, Black Hawk, IA
Built 1942 Load: 30.3 t ADT: 982
FM
PoorOver: TRIB. OF BEAVER CREEK
082280305, Boone, IA
Built 1948 Load: 30.3 t ADT: 279
432ND AVENUE
PoorOver: ELK RIVER
083E61506, Clinton, IA
Built 1968 Load: 30.3 t ADT: 310
LOCAL
PoorOver: DRAINAGE
074260501, Madison, IA
Built 1981 Load: 30.3 t ADT: 45
115TH AVE
PoorOver: WAPSIPINICON RIVER
080E21204, Scott, IA
Built 1965 Load: 30.3 t ADT: 750
FM
PoorOver: SHORT CREEK
076221804, Warren, IA
Built 1968 Load: 30.3 t ADT: 717
390TH
PoorOver: SHELLROCK RIVER
098201201, Worth, IA
Built 1958 Load: 30.3 t ADT: 363
FM
PoorOver: LITTLE WALNUT CREEK
069180902, Appanoose, IA
Built 1967 Load: 30.4 t ADT: 530
FM
PoorOver: PRAIRIE CREEK
085101005, Benton, IA
Built 1967 Load: 30.4 t ADT: 550
E EAGLE RD
PoorOver: MILLER CREEK
87-13-24-01-10, Black Hawk, IA
Built 1965 Load: 30.4 t ADT: 255
Showing 20,251-20,300 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.