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
LOCAL
Structurally DeficientOver: TRIB DESMOINES RIVER R
068082805, Van Buren, IA
Built 1971 Load: 14.8 t ADT: 5
FM
Structurally DeficientOver: ENGLISH RIVER
078110205, Iowa, IA
Built 1958 Load: 14.9 t ADT: 690
LCL-PAINTER RD
Structurally DeficientOver: DRAINAGE
071432708, Mills, IA
Built 1930 Load: 14.9 t ADT: 35
LOCAL
Structurally DeficientOver: N BUFFALO CREEK
100243102, Winnebago, IA
Built 1949 Load: 14.9 t ADT: 5
FM
Structurally DeficientOver: LANDPHERE CREEK
091153201, Butler, IA
Built 1964 Load: 15.0 t ADT: 70
AKRON RD
Structurally DeficientOver: STREAM
077340401, Cass, IA
Built 1978 Load: 15.0 t ADT: 11
LOCAL
Structurally DeficientOver: SHORT CREEK
075050902, Louisa, IA
Built 1964 Load: 15.1 t ADT: 26
LOCAL
Structurally DeficientOver: JONES CREEK
075283604, Madison, IA
Built 1938 Load: 15.1 t ADT: 45
FM
Structurally DeficientOver: OVER UP RR
072171203, Monroe, IA
Built 1936 Load: 15.1 t ADT: 360
QUARTZ AVE
Structurally DeficientOver: CREEK
090441202, Plymouth, IA
Built 1900 Load: 15.1 t ADT: 5
LOCAL
Structurally DeficientOver: CROOKED CREEK
092310901, Pocahontas, IA
Built 1917 Load: 15.1 t ADT: 50
GRANT ST SOUTH
Structurally DeficientOver: MUD CREEK
079220602, Polk, IA
Built 1927 Load: 15.1 t ADT: 2,902
FM
Structurally DeficientOver: PLATTE DRAINAGE DITCH
067322302, Taylor, IA
Built 1964 Load: 15.1 t ADT: 11
LOCAL ROAD
Structurally DeficientOver: NORTH WOLF CREEK
074231302, Warren, IA
Built 1970 Load: 15.1 t ADT: 51
LOCAL
Structurally DeficientOver: GRAND RIVER
075302201, Adair, IA
Built 1939 Load: 15.2 t ADT: 30
LOCAL/NEWPORT
Structurally DeficientOver: CREEK
075351203, Cass, IA
Built 1959 Load: 15.2 t ADT: 26
LOCAL
Structurally DeficientOver: BRANCH WOLF CREEK
086171101, Grundy, IA
Built 1915 Load: 15.2 t ADT: 44
LOCAL
Structurally DeficientOver: BRANCH BEAVER CREEK
089170902, Grundy, IA
Built 1971 Load: 15.2 t ADT: 29
410 140TH ST
Structurally DeficientOver: BOONE RIVER
094261501, Hancock, IA
Built 1927 Load: 15.2 t ADT: 21
LOCAL
Structurally DeficientOver: NORTH WALNUT CREEK
082153504, Tama, IA
Built 1915 Load: 15.2 t ADT: 26
LOCAL ROAD
Structurally DeficientOver: TURKEY RIVER
098102705, Winneshiek, IA
Built 1959 Load: 15.2 t ADT: 33
LOCAL- 630TH ST
Structurally DeficientOver: MAPLE RIVER
090392001, Cherokee, IA
Built 1900 Load: 15.3 t ADT: 26
1450 DEER AVE
Structurally DeficientOver: BOONE RIVER
094261002, Hancock, IA
Built 1968 Load: 15.3 t ADT: 11
LOCAL
Structurally DeficientOver: BRANCH WOLF CREEK
086171201, Grundy, IA
Built 1956 Load: 15.4 t ADT: 30
FM
Structurally DeficientOver: PLUM CREEK
070301702, Ringgold, IA
Built 1954 Load: 15.4 t ADT: 120
K AVENUE
Structurally DeficientOver: STREAM
070380104, Page, IA
Built 1999 Load: 15.5 t ADT: 5
FM
Structurally DeficientOver: PLATTE RIVER
070310401, Ringgold, IA
Built 1955 Load: 15.5 t ADT: 60
GRANT AVE
Structurally DeficientOver: SMALL
080033006, Cedar, IA
Built 1976 Load: 15.6 t ADT: 15
110TH STREET
Structurally DeficientOver: WEST TARKIO RIVER
070381101, Page, IA
Built 1953 Load: 15.6 t ADT: 20
FM
Structurally DeficientOver: TARKIO CREEK
071373201, Montgomery, IA
Built 1955 Load: 15.7 t ADT: 219
LOCAL ROAD
Structurally DeficientOver: LIME STONE CREEK
074252904, Warren, IA
Built 1965 Load: 15.7 t ADT: 20
EMMETT AVE
Structurally DeficientOver: OTTER CREEK
092261102, Wright, IA
Built 1969 Load: 15.7 t ADT: 11
LOCAL - 100TH
Structurally DeficientOver: CREEK
077370601, Cass, IA
Built 1900 Load: 15.8 t ADT: 11
LOCAL
Structurally DeficientOver: SPRING BRANCH CREEK
094132101, Chickasaw, IA
Built 1972 Load: 15.8 t ADT: 21
LOCAL
Structurally DeficientOver: DRAINAGE
071181008, Monroe, IA
Built 1965 Load: 15.8 t ADT: 20
LOCAL
Structurally DeficientOver: BRUSH CREEK
070210601, Wayne, IA
Built 1993 Load: 15.8 t ADT: 40
LOCAL
Structurally DeficientOver: DD
088291501, Webster, IA
Built 1960 Load: 15.8 t ADT: 15
LOCAL
Structurally DeficientOver: BR STEIN CK
084121602, Benton, IA
Built 1969 Load: 15.9 t ADT: 34
300TH ST
Structurally DeficientOver: NUTTING CR
095080207, Fayette, IA
Built 1917 Load: 15.9 t ADT: 20
LOCAL GROVE AVE
Structurally DeficientOver: BRANCH CRANE CREEK
099133004, Howard, IA
Built 1983 Load: 15.9 t ADT: 31
FM
Structurally DeficientOver: W NODAWAY
071362103, Montgomery, IA
Built 1939 Load: 15.9 t ADT: 300
LOCAL
Structurally DeficientOver: SMALL STREAM
069102103, Van Buren, IA
Built 1975 Load: 15.9 t ADT: 30
295 AVENUE
Structurally DeficientOver: RELIEF
068421404, Fremont, IA
Built 1961 Load: 16.0 t ADT: 21
FM
Structurally DeficientOver: HONEY CREEK
086193004, Hardin, IA
Built 1900 Load: 16.0 t ADT: 29
S 24TH AVE W
Structurally DeficientOver: CHERRY CREEK
079190605, Jasper, IA
Built 1979 Load: 16.0 t ADT: 62
LOCAL
Structurally DeficientOver: CREEK
067331603, Taylor, IA
Built 1949 Load: 16.0 t ADT: 5
LOCAL
Structurally DeficientOver: SMALL STREAM
071290606, Union, IA
Built 1990 Load: 16.0 t ADT: 11
UNION AVENUE
Structurally DeficientOver: SAYLINGS CREEK
071321002, Adams, IA
Built 1965 Load: 16.1 t ADT: 26
LOCAL
Structurally DeficientOver: CREEK
096182003, Floyd, IA
Built 1958 Load: 16.1 t ADT: 78
FM
Structurally DeficientOver: COMPETINE CREEK
072110510, Jefferson, IA
Built 1954 Load: 16.1 t ADT: 45
Showing 20,401-20,450 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 |