Total Bridges
5,905
Public highway bridges in South Dakota
State profile · Above national median SD
South Dakota bridge safety
Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in South Dakota — drawn straight from the FHWA National Bridge Inventory.
- 5,905
- Public bridges
- 31.9%
- Good condition
- 16.2%
- Poor condition
- 16.2%
- Structurally deficient
Good Condition
31.9%
1,885 bridges rated 7-9
-18.1pp vs 50% benchmark
Poor Condition
16.2%
959 bridges rated 0-4
Structurally Deficient
16.2%
959 bridges flagged for repair priority
9.2pp vs national avg 7.0%
South Dakota vs national bridge condition
South Dakota — Good condition share 31.9%
National avg
Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).
South Dakota — Structurally deficient share 54.1%
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 — South Dakota (FHWA NBI)
Counties (66)
Aurora 61 Beadle 153 Bennett 15 Bon Homme 126 Brookings 234 Brown 170 Brule 38 Buffalo 25 Butte 143 Campbell 15 Charles Mix 103 Clark 21 Clay 94 Codington 74 Corson 49 Custer 95 Davison 125 Day 37 Deuel 72 Dewey 28 Douglas 44 Edmunds 20 Fall River 80 Faulk 46 Grant 205 Gregory 51 Haakon 69 Hamlin 62 Hand 126 Hanson 62 Harding 49 Hughes 41 Hutchinson 161 Hyde 23 Jackson 89 Jerauld 35 Jones 37 Kingsbury 35 Lake 79 Lawrence 136 Lincoln 207 Lyman 114 Marshall 39 McCook 98 McPherson 14 Meade 217 Mellette 28 Miner 64 Minnehaha 395 Moody 87 Oglala Lakota 34 Pennington 350 Perkins 60 Potter 24 Roberts 157 Sanborn 53 Spink 176 Stanley 37 Sully 31 Todd 24 Tripp 90 Turner 143 Union 172 Walworth 34 Yankton 99 Ziebach 30
South Dakota 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 South Dakota on the same metric.
66
Guam
15.25% top marginal rate
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 South Dakota
Six lowest-condition bridges in South Dakota, ranked by composite NBI rating. Each is inspected at least every 24 months.
483 AVENUE
Structurally DeficientOver: WHETSTONE RV
4.8E & 3.2N MILBANK, Grant, SD
Built 1962 Load: 0.9 t ADT: 25
202ND ST.
Structurally DeficientOver: BEAR BUTTE CK
5.3E BEAR BUTTE, Meade, SD
Built 2000 Load: 0.9 t ADT: 50
45980 303 ST.
Structurally DeficientOver: VERMILLION RV
6S & 7.8E IRENE, Clay, SD
Built 1909 Load: 1.8 t ADT: 15
460th Avenue
Structurally DeficientOver: Big Coulee Creek
4S & 2W of Peever, Roberts, SD
Built 1950 Load: 2.2 t ADT: 22
197TH ST
Structurally DeficientOver: TURTLE CK
1N & 1E ST LAWRENCE, Hand, SD
Built 1925 Load: 2.5 t ADT: 25
242 ST
Structurally DeficientOver: CK
1.8E 11.0N PLANKINTON, Aurora, SD
Built 1917 Load: 2.7 t ADT: 101
All Bridges in South Dakota
132nd Street
FairOver: Creek
1N & 2.5E of Groton, Brown, SD
Built 1984 Load: 24.5 t ADT: 98
134th Street
FairOver: Creek
2.7E & 1S of Groton, Brown, SD
Built 1930 Load: 24.5 t ADT: 98
134th Street
FairOver: Creek
2.6E of Groton, Brown, SD
Built 1932 Load: 24.5 t ADT: 98
138th Street
FairOver: Mud Creek
4N & 3.1E of Ferney, Brown, SD
Built 1983 Load: 24.5 t ADT: 12
410th Avenue
FairOver: Crow Creek Ditch
7.4N of Claremont, Brown, SD
Built 1950 Load: 24.5 t ADT: 234
411th Avenue
FairOver: Mud Creek
5E & 0.6N of Ferney, Brown, SD
Built 1938 Load: 24.5 t ADT: 98
412th Avenue
FairOver: Creek
5.7E & 0.5N of Ferney, Brown, SD
Built 1930 Load: 24.5 t ADT: 235
350 AVENUE
FairOver: CK
0.5W & 4.2S PUKWANA, Brule, SD
Built 1964 Load: 24.5 t ADT: 41
261 STREET
FairOver: CK
1.7E & 12S PUKWANA, Brule, SD
Built 1961 Load: 24.5 t ADT: 16
263 STREET
FairOver: CK
12S & 6.6W KIMBALL, Brule, SD
Built 1935 Load: 24.5 t ADT: 80
221st Street
FairOver: Elm Creek
10N & 13W of Gann Valley, Buffalo, SD
Built 1975 Load: 24.5 t ADT: 41
349th Avenue
FairOver: Elm Creek
11.0W & 6.8N Gann Valley, Buffalo, SD
Built 1975 Load: 24.5 t ADT: 55
225th Street
FairOver: Elm Creek
6N & 10.6W of Gann Valley, Buffalo, SD
Built 1975 Load: 24.5 t ADT: 41
350th Avenue
FairOver: Crow Creek
9.5W & 3.4S Gann Valley, Buffalo, SD
Built 1975 Load: 24.5 t ADT: 41
BEULAH RD
FairOver: TRIB REDWATER CK
8.2W & 4.5S OF BELLE FOUR, Butte, SD
Built 1975 Load: 24.5 t ADT: 100
3VVV RD
FairOver: MIDDLE CK
1.5N & 1.5W BELLE FOURCHE, Butte, SD
Built 2002 Load: 24.5 t ADT: 50
CAMP CROOK RD
FairOver: NORTH INDIAN CK
9.0 N JCT US 85, Butte, SD
Built 2012 Load: 24.5 t ADT: 110
ROUNDUP STREET
FairOver: BELLE FOURCHE RV
END OF ROUNDUP ST - BF, Butte, SD
Built 1980 Load: 24.5 t ADT: 49
NATIONAL STREET
FairOver: WILLOW CK
0.2E US85 - BELLE FOURCHE, Butte, SD
Built 2008 Load: 24.5 t ADT: 112
SNOMA ROAD
FairOver: REDWATER RV
0.5 E BELLE FOURCHE, Butte, SD
Built 1987 Load: 24.5 t ADT: 112
BEAN ROAD
FairOver: INLET CHANNEL
2.1N & 3.5E BELLE FOURCHE, Butte, SD
Built 1997 Load: 24.5 t ADT: 20
BELLE FOURCHE INLE
FairOver: INLET CANAL
6E & 1.3N BELLE FRCH, Butte, SD
Built 1999 Load: 24.5 t ADT: 47
ARPAN RD
FairOver: NORTH CANAL
5W 9 N NISLAND, Butte, SD
Built 1967 Load: 24.5 t ADT: 51
ARPAN RD
FairOver: INDIAN CK
5W 7.5N NISLAND, Butte, SD
Built 1990 Load: 24.5 t ADT: 100
OLD HWY 85
FairOver: CK
6 N 16.5 W HOOVER, Butte, SD
Built 1932 Load: 24.5 t ADT: 21
MAIL RD
FairOver: OWL CK
8.0W 0.2N NEWELL, Butte, SD
Built 1978 Load: 24.5 t ADT: 47
OLD HIGHWAY 85
FairOver: HAY CK
6N 14.7W OF HOOVER, Butte, SD
Built 1932 Load: 24.5 t ADT: 21
RILEY RD
FairOver: OWL CK
6.0W 1.1S NEWELL, Butte, SD
Built 2021 Load: 24.5 t ADT: 71
WHITEWOOD RD
FairOver: SOUTH CANAL
6 W 4.1 S NEWELL, Butte, SD
Built 1980 Load: 24.5 t ADT: 143
VALE CUTOFF RD
FairOver: SOUTH CANAL
6 S 2.7 W NEWELL, Butte, SD
Built 1982 Load: 24.5 t ADT: 66
VALLEY TOWNSHIP RD
FairOver: COTTONWOOD CK
0.8 W VALE, Butte, SD
Built 1978 Load: 24.5 t ADT: 870
YOUNGBERG ROAD
FairOver: HORSE CK
2.2 N 2 E VALE, Butte, SD
Built 1978 Load: 24.5 t ADT: 47
LEWIS ROAD
FairOver: DRY CK
3 N 3.5 E VALE, Butte, SD
Built 1984 Load: 24.5 t ADT: 49
ZEONA
FairOver: CK
1.ON & 1.1E HOOVER, Butte, SD
Built 2020 Load: 24.5 t ADT: 4
TWILIGHT RD
FairOver: NORTH FORK SULPHUR CK
12 E 13.9 N NEWELL, Butte, SD
Built 1998 Load: 24.5 t ADT: 28
DOUBLE R RD
FairOver: NORTH FORK SULPHUR CK
12 E 12.8 N NEWELL, Butte, SD
Built 1962 Load: 24.5 t ADT: 28
TWILIGHT RD
FairOver: SOUTH FORK MOREAU RV
10.8 E 3.5 S HOOVER, Butte, SD
Built 1982 Load: 24.5 t ADT: 8
TWILIGHT RD
FairOver: CK
6.4S & 11.5E HOOVER, Butte, SD
Built 2020 Load: 24.5 t ADT: 8
WEST FAIRPOINT RD
FairOver: CK
2N & 22E Newell, Butte, SD
Built 2017 Load: 24.5 t ADT: 30
36660 271st Street
FairOver: Platte Creek
5N & 1.4W of Platte, Charles Mix, SD
Built 1940 Load: 24.5 t ADT: 196
27040 371st Avenue
FairOver: Platte Creek
5.6N & 4.0E of Platte, Charles Mix, SD
Built 1968 Load: 24.5 t ADT: 95
375th Avenue
FairOver: Pease Creek
3.8 & 1.0E of Geddes, Charles Mix, SD
Built 1965 Load: 24.5 t ADT: 48
28960 395th Avenue
FairOver: Greasy Horn Creek
7.4N of Wagner, Charles Mix, SD
Built 1935 Load: 24.5 t ADT: 287
29090 395th Avenue
FairOver: Creek
6.1N of Wagner, Charles Mix, SD
Built 1935 Load: 24.5 t ADT: 289
30040 401st Avenue
FairOver: Creek
0.4S & 1.0E of Dante, Charles Mix, SD
Built 1945 Load: 24.5 t ADT: 48
414th Avenue
FairOver: Fordham Creek
5.5 N Raymond, Clark, SD
Built 1956 Load: 24.5 t ADT: 236
415th Avenue
FairOver: Creek
4.1 N of Carpenter, Clark, SD
Built 1949 Load: 24.5 t ADT: 176
415th Avenue
FairOver: Creek
2.0 N of Carpenter, Clark, SD
Built 1949 Load: 24.5 t ADT: 182
417th Avenue
FairOver: Creek
8.8N & 2.0E of Carpenter, Clark, SD
Built 1981 Load: 24.5 t ADT: 39
419th Avenue
FairOver: Creek
8.4N&4.0E Carpenter, Clark, SD
Built 1983 Load: 24.5 t ADT: 39
Showing 1,251-1,300 of 5,905 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 |