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: FIELD DRAINAGE DITCH
074261701, Madison, IA
Built 1951 Load: 27.1 t ADT: 417
LOCAL
Structurally DeficientOver: HUNTLEY BRANCH CREEK
085E22703, Jackson, IA
Built 1977 Load: 27.2 t ADT: 26
FM
Structurally DeficientOver: IOWA RIVER OVERFLOW
082131704, Tama, IA
Built 1967 Load: 27.3 t ADT: 786
LOCAL
Structurally DeficientOver: STREAM
075203001, Marion, IA
Built 1956 Load: 27.5 t ADT: 30
NOTCHWOOD AVE
Structurally DeficientOver: W BRANCH 102 RIVER
071330902, Adams, IA
Built 1971 Load: 27.7 t ADT: 26
MOBILE AVE
Structurally DeficientOver: HOFFMAN CREEK
080432202, Harrison, IA
Built 1940 Load: 27.8 t ADT: 29
FM
Structurally DeficientOver: #6 DITCH
067420603, Fremont, IA
Built 1986 Load: 27.9 t ADT: 29
240 AVENUE
Structurally DeficientOver: MAIN DITCH
068432402, Fremont, IA
Built 1981 Load: 27.9 t ADT: 5
GREEN CASTLE AV
Structurally DeficientOver: SMALL STREAM
079071802, Johnson, IA
Built 1900 Load: 28.1 t ADT: 46
BLUFF ROAD
Structurally DeficientOver: COOPER CREEK
068420708, Fremont, IA
Built 1959 Load: 28.6 t ADT: 244
LOCAL
Structurally DeficientOver: STREAM
078161503, Poweshiek, IA
Built 1968 Load: 29.0 t ADT: 11
FM SW NAPLES AV
Structurally DeficientOver: CROOKED CR
078063202, Johnson, IA
Built 1942 Load: 29.7 t ADT: 70
279TH AVE
Structurally DeficientOver: DRAINAGE
100091904, Winneshiek, IA
Built 1900 Load: 29.8 t ADT: 15
FM
Structurally DeficientOver: MUD CREEK
084112101, Benton, IA
Built 1955 Load: 30.0 t ADT: 200
FM - OXFORD
Structurally DeficientOver: SEVEN MILE CREEK
075351501, Cass, IA
Built 1974 Load: 30.2 t ADT: 139
115TH AVE
Structurally DeficientOver: WAPSIPINICON RIVER
080E21204, Scott, IA
Built 1965 Load: 30.3 t ADT: 750
FM
Structurally DeficientOver: SHORT CREEK
076221804, Warren, IA
Built 1968 Load: 30.3 t ADT: 717
FM
Structurally DeficientOver: PRAIRIE CREEK
085101005, Benton, IA
Built 1967 Load: 30.4 t ADT: 550
E EAGLE RD
Structurally DeficientOver: MILLER CREEK
87-13-24-01-10, Black Hawk, IA
Built 1965 Load: 30.4 t ADT: 255
FM
Structurally DeficientOver: ROCK CREEK
084172813, Marshall, IA
Built 1965 Load: 30.4 t ADT: 2,838
240TH AVE
Structurally DeficientOver: CREEK
079E50702, Scott, IA
Built 1967 Load: 30.4 t ADT: 2,180
LOCAL
Structurally DeficientOver: SPRING BRANCH
086E22903, Jackson, IA
Built 1993 Load: 30.5 t ADT: 40
CAMP COMFORT
Structurally DeficientOver: SMALL STREAM
093161906, Butler, IA
Built 1936 Load: 30.6 t ADT: 42
LOCAL RD
Structurally DeficientOver: TARKIO CREEK
071372005, Montgomery, IA
Built 1966 Load: 30.6 t ADT: 11
FM SW BAYRTWN R
Structurally DeficientOver: STREAM
078072303, Johnson, IA
Built 1964 Load: 30.8 t ADT: 240
390TH
Structurally DeficientOver: ROCK CREEK
098180701, Mitchell, IA
Built 1973 Load: 30.8 t ADT: 216
FM
Structurally DeficientOver: SMALL STREAM
078161205, Poweshiek, IA
Built 1969 Load: 30.8 t ADT: 2,000
FM
Structurally DeficientOver: SMALL
084E63303, Jackson, IA
Built 1980 Load: 31.4 t ADT: 80
HWY 147
Structurally DeficientOver: FLOOD CREEK
095171501, Floyd, IA
Built 1930 Load: 31.7 t ADT: 668
FM
Structurally DeficientOver: TARKIO CREEK TRIB
071373301, Montgomery, IA
Built 1959 Load: 32.0 t ADT: 219
LOCAL
Structurally DeficientOver: BR WAPSIPINICON RIVER
097140402, Howard, IA
Built 1988 Load: 32.3 t ADT: 31
LOCAL
Structurally DeficientOver: SOUTH FORK CATFISH CREEK
089E23304, Dubuque, IA
Built 1926 Load: 32.4 t ADT: 756
FM
Structurally DeficientOver: WOLF CREEK
073290104, Union, IA
Built 1976 Load: 32.5 t ADT: 60
LOCAL
Structurally DeficientOver: SMALL STREAM
093181802, Butler, IA
Built 1961 Load: 32.7 t ADT: 10
LOCAL TAYLOR AV
Structurally DeficientOver: SMALL CREEK
079413302, Harrison, IA
Built 1955 Load: 32.7 t ADT: 45
185TH LANE
Structurally DeficientOver: ALLEN CREEK
080431705, Harrison, IA
Built 1986 Load: 32.7 t ADT: 5
1ST STREET
Structurally DeficientOver: INDIAN CREEK
000000000, Pottawattamie, IA
Built 1936 Load: 32.7 t ADT: 684
LOC TAYLOR AVE
Structurally DeficientOver: BUFFALO CR
090072902, Buchanan, IA
Built 1951 Load: 33.2 t ADT: 35
RAILROAD HWY
Structurally DeficientOver: STREAM
076420912, Pottawattamie, IA
Built 1952 Load: 33.7 t ADT: 1,676
DRUMLIN RD
Structurally DeficientOver: SCHNEIDERS CREEK
093052701, Clayton, IA
Built 1914 Load: 33.9 t ADT: 10
FM TABOR AVE
Structurally DeficientOver: SMALL STREAM
081410406, Harrison, IA
Built 1956 Load: 34.4 t ADT: 110
US 218
Structurally DeficientOver: DRAINAGE DITCH
094141800, Chickasaw, IA
Built 1959 Load: 34.5 t ADT: 639
LOCAL
Structurally DeficientOver: CREEK
087020204, Dubuque, IA
Built 1925 Load: 35.1 t ADT: 30
LOCAL
Structurally DeficientOver: CREEK
077E11703, Muscatine, IA
Built 1942 Load: 35.3 t ADT: 21
480TH
Structurally DeficientOver: SMALL STREAM
100182601, Mitchell, IA
Built 1984 Load: 35.4 t ADT: 216
PARKER TRAIL
Structurally DeficientOver: SMALL CREEK
079420904, Harrison, IA
Built 1916 Load: 36.7 t ADT: 29
LOCAL ROAD
Structurally DeficientOver: DRAINAGE DITCH
080230902, Polk, IA
Built 1914 Load: 37.2 t ADT: 459
FM
Structurally DeficientOver: CREEK
086E23505, Jackson, IA
Built 1945 Load: 37.9 t ADT: 50
280 TH
Structurally DeficientOver: SNAKE CREEK
082290201, Greene, IA
Built 1916 Load: 39.0 t ADT: 41
NICKEL AVE
Structurally DeficientOver: MUNNS CREEK
087163004, Grundy, IA
Built 1955 Load: 41.5 t ADT: 216
Showing 20,701-20,750 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 |