Total Bridges
20,753
Public highway bridges in Iowa
State profile · Above national median SD
Iowa bridge safety
Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in Iowa — drawn straight from the FHWA National Bridge Inventory.
- 20,753
- Public bridges
- 36.5%
- Good condition
- 20.0%
- Poor condition
- 20.0%
- Structurally deficient
Good Condition
36.5%
7,582 bridges rated 7-9
-13.5pp vs 50% benchmark
Poor Condition
20.0%
4,153 bridges rated 0-4
Structurally Deficient
20.0%
4,153 bridges flagged for repair priority
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 — Structurally deficient share 66.7%
National avg
Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.
Condition Distribution
Bridge inventory deck-condition mix — Iowa (FHWA NBI)
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 on the structurally deficient leaderboard (lower share = better)
States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below Iowa on the same metric.
54
West Virginia
16.02% top marginal rate
46
South Dakota
16.24% top marginal rate
19
Iowa
20.01% top marginal rate
78
Virgin Islands
29.17% top marginal rate
Bridges Needing Most Attention in Iowa
Six lowest-condition bridges in Iowa, ranked by composite NBI rating. Each is inspected at least every 24 months.
270TH STREET
Structurally DeficientOver: 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
Structurally DeficientOver: MUD CREEK
87-12-15-02-10, Black Hawk, IA
Built 1948 Load: 2.7 t ADT: 11
LOCAL - 700TH
Structurally DeficientOver: TRIB TROUBLESOME CREEK
077351402, Cass, IA
Built 1983 Load: 2.7 t ADT: 11
LOCAL - DAYTONA
Structurally DeficientOver: BUCK CREEK
077361903, Cass, IA
Built 1980 Load: 2.7 t ADT: 35
100TH ST.
Structurally DeficientOver: UNION CREEK
083E20101, Clinton, IA
Built 1900 Load: 2.7 t ADT: 78
All Bridges in Iowa
FM
Structurally DeficientOver: WEST 102 RIVER
069353601, Taylor, IA
Built 1962 Load: 12.6 t ADT: 329
FM
Structurally DeficientOver: WEST FORK LITTLE SIOUX
087450302, Woodbury, IA
Built 1955 Load: 12.6 t ADT: 549
LOCAL
Structurally DeficientOver: OTTER CREEK
073252503, Clarke, IA
Built 1980 Load: 12.7 t ADT: 11
ROSEBUD AVE
Structurally DeficientOver: BUCK CREEK
078192902, Jasper, IA
Built 1919 Load: 12.7 t ADT: 104
LOCAL
Structurally DeficientOver: W. NISHNABOTNA
080381001, Shelby, IA
Built 1926 Load: 12.7 t ADT: 21
LOCAL (LWC)
Structurally DeficientOver: BR PRAIRIE CK
082102004, Benton, IA
Built 1978 Load: 12.8 t ADT: 60
LOCAL
Structurally DeficientOver: SNIPE CREEK
082193402, Marshall, IA
Built 1920 Load: 12.8 t ADT: 20
LOCAL
Structurally DeficientOver: BIG CEDAR CK DD #41
092343503, Pocahontas, IA
Built 1964 Load: 12.8 t ADT: 26
LOCAL
Structurally DeficientOver: WHITE FOX CREEK
090252601, Wright, IA
Built 1975 Load: 12.8 t ADT: 21
210TH ST
Structurally DeficientOver: BUCK CREEK
092113303, Bremer, IA
Built 1921 Load: 12.9 t ADT: 29
FM
Structurally DeficientOver: CARTERS CREEK
068143506, Davis, IA
Built 1967 Load: 13.0 t ADT: 260
LOCAL
Structurally DeficientOver: SMALL STREAM
075033104, Louisa, IA
Built 1930 Load: 13.0 t ADT: 11
LOCAL
Structurally DeficientOver: SMALL STREAM
076211803, Marion, IA
Built 1984 Load: 13.0 t ADT: 91
LOCAL
Structurally DeficientOver: STREAM
069313304, Ringgold, IA
Built 1954 Load: 13.0 t ADT: 5
LOCAL RD
Structurally DeficientOver: SMALL STREAM
084130601, Tama, IA
Built 1930 Load: 13.0 t ADT: 33
LOCAL - 555TH
Structurally DeficientOver: CAMP CREEK
076370504, Cass, IA
Built 1976 Load: 13.1 t ADT: 21
LOCAL
Structurally DeficientOver: SMALL CREEK
078331702, Guthrie, IA
Built 1949 Load: 13.1 t ADT: 40
FM
Structurally DeficientOver: KANARANZI CREEK
100452202, Lyon, IA
Built 1959 Load: 13.1 t ADT: 369
HEMLOCK AVE
Structurally DeficientOver: GRAYBILL CREEK
075391607, Pottawattamie, IA
Built 1947 Load: 13.1 t ADT: 5
LOCAL
Structurally DeficientOver: SMALL CREEK
084120201, Benton, IA
Built 1976 Load: 13.2 t ADT: 11
LOCAL - MEMPHIS
Structurally DeficientOver: TURKEY CR
075360602, Cass, IA
Built 1900 Load: 13.2 t ADT: 5
1840 QUAIL AVE
Structurally DeficientOver: DD #6
095242302, Hancock, IA
Built 1970 Load: 13.2 t ADT: 21
LOCAL
Structurally DeficientOver: CHARITON RIVER
071233103, Lucas, IA
Built 1970 Load: 13.2 t ADT: 20
LOCAL
Structurally DeficientOver: CALHOUN CREEK
077200401, Marion, IA
Built 1953 Load: 13.2 t ADT: 16
LOCAL
Structurally DeficientOver: NORTH WALNUT CREEK
081140202, Poweshiek, IA
Built 1955 Load: 13.2 t ADT: 30
FM
Structurally DeficientOver: BRANCH OTTER CREEK
083141703, Tama, IA
Built 1927 Load: 13.2 t ADT: 79
LOCAL
Structurally DeficientOver: STREAM
083090801, Benton, IA
Built 1959 Load: 13.3 t ADT: 50
LOCAL
Structurally DeficientOver: TRIB OF DICKENSON BRANCH
067261005, Decatur, IA
Built 1965 Load: 13.3 t ADT: 46
LOCAL
Structurally DeficientOver: BR OF ENGLISH CREEK
073210103, Lucas, IA
Built 1972 Load: 13.3 t ADT: 11
LOCAL RD
Structurally DeficientOver: TOM CREEK
077282902, Madison, IA
Built 1910 Load: 13.3 t ADT: 29
LOCAL
Structurally DeficientOver: STREAM
070313502, Ringgold, IA
Built 1963 Load: 13.3 t ADT: 34
LOCAL
Structurally DeficientOver: BIG INDIAN CREEK
067090104, Van Buren, IA
Built 1967 Load: 13.3 t ADT: 30
FM
Structurally DeficientOver: BIG CREEK
088433503, Woodbury, IA
Built 1962 Load: 13.3 t ADT: 369
MUSCATINE RD
Structurally DeficientOver: SUGAR CREEK
079022203, Cedar, IA
Built 1935 Load: 13.4 t ADT: 100
LOCAL ROAD
Structurally DeficientOver: CREEK
089150501, Grundy, IA
Built 1981 Load: 13.4 t ADT: 33
LOCAL ROAD
Structurally DeficientOver: LIZARD CREEK
098462701, Lyon, IA
Built 1900 Load: 13.4 t ADT: 62
A AVENUE
Structurally DeficientOver: STREAM
069391702, Page, IA
Built 1980 Load: 13.4 t ADT: 110
LOCAL
Structurally DeficientOver: STREAM
089422804, Woodbury, IA
Built 1981 Load: 13.4 t ADT: 26
FM
Structurally DeficientOver: YANKEE RUN
081010103, Cedar, IA
Built 1940 Load: 13.5 t ADT: 330
LOCAL SECONDARY
Structurally DeficientOver: SUGAR CREEK
069072802, Lee, IA
Built 1918 Load: 13.5 t ADT: 11
LOCAL ROAD
Structurally DeficientOver: LOCAL STREAM
083430206, Monona, IA
Built 1962 Load: 13.5 t ADT: 29
110TH STREET
Structurally DeficientOver: STREAM
073341201, Adams, IA
Built 1955 Load: 13.6 t ADT: 29
155TH ST
Structurally DeficientOver: SILVER CREEK
095053303, Clayton, IA
Built 1925 Load: 13.6 t ADT: 26
LOCAL
Structurally DeficientOver: W BR LITTLE SIOUX RIVER
100381902, Dickinson, IA
Built 1910 Load: 13.6 t ADT: 35
LOCAL
Structurally DeficientOver: CREEK
091283204, Humboldt, IA
Built 1900 Load: 13.6 t ADT: 180
LOCAL
Structurally DeficientOver: BR DES MOINES RIVER
075181007, Marion, IA
Built 1878 Load: 13.6 t ADT: 21
FM
Structurally DeficientOver: DIVERSION DITCH
084441808, Monona, IA
Built 1962 Load: 13.6 t ADT: 597
DOGWOOD ROAD
Structurally DeficientOver: SILVER CREEK
075413501, Pottawattamie, IA
Built 1930 Load: 13.6 t ADT: 29
LOCAL
Structurally DeficientOver: SOUTH TIMBER CREEK
082170602, Marshall, IA
Built 1938 Load: 13.7 t ADT: 44
LOCAL
Structurally DeficientOver: STREAM
081152403, Poweshiek, IA
Built 1973 Load: 13.7 t ADT: 15
Showing 20,301-20,350 of 20,753 bridges
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges Editorial.
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). A "structurally deficient" rating is a repair-priority signal, not a closure or unsafe-to-cross designation. Consult a qualified civil engineer before making decisions based on this data.
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.
| Publisher | Kiznis Studio |
| Sources | FHWA National Bridge Inventory, public U.S. government datasets |