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
296th Street
FairOver: West Brule Creek
1N & 3.4E of Beresford, Lincoln, SD
Built 1981 Load: 24.5 t ADT: 45
477th Avenue
FairOver: Nine Mile Creek
1E & 1.5S of Harrisburg, Lincoln, SD
Built 1977 Load: 24.5 t ADT: 75
294th Street
FairOver: Trib. to E Brule Creek
0.8W of Norway Center, Lincoln, SD
Built 1950 Load: 24.5 t ADT: 172
285th Street
FairOver: Trib to Little Beaver Ck
1.8W & 3S of Canton, Lincoln, SD
Built 1978 Load: 24.5 t ADT: 75
480th Avenue
FairOver: S Fork of Beaver Creek
1W & 1.1S of Canton, Lincoln, SD
Built 1953 Load: 24.5 t ADT: 53
480th Avenue
FairOver: Little Beaver Creak
1W & 2.4S of Canton, Lincoln, SD
Built 1989 Load: 24.5 t ADT: 63
Bartlett Avenue
FairOver: S Fork of Beaver Creek
1.3S of Canton, Lincoln, SD
Built 1983 Load: 24.5 t ADT: 50
283rd Street
FairOver: Beaver Creek
1S of Canton, Lincoln, SD
Built 1976 Load: 24.5 t ADT: 45
294th Street
FairOver: Trib. to E Brule Creek
1.7E of Norway Center, Lincoln, SD
Built 1930 Load: 24.5 t ADT: 242
295th Street
FairOver: East Brule Creek
2N & 8.8E of Beresford, Lincoln, SD
Built 1930 Load: 24.5 t ADT: 45
481st Avenue
FairOver: East Brule Creek
9E & 2.7N of Beresford, Lincoln, SD
Built 1968 Load: 24.5 t ADT: 55
292nd Street
FairOver: East Brule Creek
5N & 9.2E of Beresford, Lincoln, SD
Built 1966 Load: 24.5 t ADT: 85
294th Street
FairOver: East Brule Creek
6.2W of Hudson, Lincoln, SD
Built 1930 Load: 24.5 t ADT: 239
483rd Avenue
FairOver: Trib. to Pattee Creek
8.3S & 2E of Canton, Lincoln, SD
Built 1935 Load: 24.5 t ADT: 40
484th Avenue
FairOver: Pattee Creek
7.9S & 3E of Canton, Lincoln, SD
Built 1990 Load: 24.5 t ADT: 50
291st Street
FairOver: Pattee Creek
9S & 3.6E of Canton, Lincoln, SD
Built 1988 Load: 24.5 t ADT: 45
292nd Street
FairOver: Pattee Creek
5S & 1.3W of Fairview, Lincoln, SD
Built 1988 Load: 24.5 t ADT: 45
240th Street
FairOver: Medicine Creek
5.5W & 1.0N of Presho, Lyman, SD
Built 2005 Load: 24.5 t ADT: 60
303rd Avenue
FairOver: Cedar Creek
1W & 16.2N of Presho, Lyman, SD
Built 1998 Load: 24.5 t ADT: 60
312th Avenue
FairOver: Medicine Creek
2.9W & 0.8N of Kennebec, Lyman, SD
Built 1975 Load: 24.5 t ADT: 24
241st Street
FairOver: Medicine Creek
0.5E of Kennebec, Lyman, SD
Built 1979 Load: 24.5 t ADT: 40
338th Avenue
FairOver: Creek
2.8S of Iona, Lyman, SD
Built 1932 Load: 24.5 t ADT: 15
415th Avenue
FairOver: Crow Creek Ditch
2.0N of Amherst, Marshall, SD
Built 1993 Load: 24.5 t ADT: 322
114th Street
FairOver: Spain Ditch
0.4S & 2.1E of Amherst, Marshall, SD
Built 1934 Load: 24.5 t ADT: 103
419th Avenue
FairOver: Spain Ditch
0.5W & 5.9N of Langford, Marshall, SD
Built 1971 Load: 24.5 t ADT: 16
420th Avenue
FairOver: Crow Creek
3.6S 3.0W of Britton, Marshall, SD
Built 1981 Load: 24.5 t ADT: 57
421st Avenue
FairOver: Creek
3.7S & 2W of Britton, Marshall, SD
Built 1971 Load: 24.5 t ADT: 35
252nd Street
FairOver: Wolf Creek
0.5W of Spencer, McCook, SD
Built 1930 Load: 24.5 t ADT: 150
245th Street
FairOver: Wolf Creek
7N & 0.3W of Spencer, McCook, SD
Built 1978 Load: 24.5 t ADT: 66
251st Street
FairOver: Wolf Creek
1N & 0.2W of Spencer, McCook, SD
Built 1983 Load: 24.5 t ADT: 25
431st Avenue
FairOver: Wolf Creek
6.6N of Spencer, McCook, SD
Built 1972 Load: 24.5 t ADT: 20
431st Avenue
FairOver: Wolf Creek
1.3N of Spencer, McCook, SD
Built 1930 Load: 24.5 t ADT: 181
249th Street
FairOver: Wolf Creek
3N & 0.4E of Spencer, McCook, SD
Built 1978 Load: 24.5 t ADT: 15
267th Street
FairOver: Wolf Creek
2S & 1.6W of Bridgewater, McCook, SD
Built 1996 Load: 24.5 t ADT: 35
249th Street
FairOver: W. Fork of Vermillion Rv
3N & 1.7W of Salem, McCook, SD
Built 1993 Load: 24.5 t ADT: 35
252nd Street
FairOver: W. Fork of Vermillion Rv
1.5W of Salem, McCook, SD
Built 1925 Load: 24.5 t ADT: 157
254th Street
FairOver: W. Fork of Vermillion Rv
1S & 1.3W of Salem, McCook, SD
Built 1980 Load: 24.5 t ADT: 40
256th Street
FairOver: W. Fork of Vermillion Rv
3S & 0.7W of Salem, McCook, SD
Built 1930 Load: 24.5 t ADT: 24
257th Street
FairOver: W. Fork of Vermillion Rv
4S & 0.3E of Salem, McCook, SD
Built 1925 Load: 24.5 t ADT: 155
259th Street
FairOver: W. Fork of Vermillion Rv
6.5S & 0.1W of Salem, McCook, SD
Built 1983 Load: 24.5 t ADT: 35
262nd Street
FairOver: W. Fork of Vermillion Rv
9.5S & 1E of Salem, McCook, SD
Built 1983 Load: 24.5 t ADT: 10
263rd Street
FairOver: W. Fork of Vermillion Rv
10.5S & 1.3E of Salem, McCook, SD
Built 1979 Load: 24.5 t ADT: 45
266th Street
FairOver: W. Fork of Vermillion Rv
13.5S & 1.9E of Salem, McCook, SD
Built 1983 Load: 24.5 t ADT: 40
443rd Avenue
FairOver: W. Fork of Vermillion Rv
2E & 14.2S of Salem, McCook, SD
Built 1979 Load: 24.5 t ADT: 40
267th Street
FairOver: W. Fork of Vermillion Rv
14.5S & 2.2E of Salem, McCook, SD
Built 1979 Load: 24.5 t ADT: 23
444th Avenue
FairOver: Little Vermillion River
4.2N & 3E of Salem, McCook, SD
Built 1970 Load: 24.5 t ADT: 66
446th Avenue
FairOver: Little Vermillion River
2.5N & 5E of Salem, McCook, SD
Built 1961 Load: 24.5 t ADT: 35
251st Street
FairOver: Little Vermillion River
1.5N & 7.3E of Salem, McCook, SD
Built 1986 Load: 24.5 t ADT: 66
261st Street
FairOver: Battle Creek
3.3E of Canistota, McCook, SD
Built 1970 Load: 24.5 t ADT: 110
450th Avenue
FairOver: Trib. to E Fork Verm Rv
5.5S & 4E of Canistota, McCook, SD
Built 1940 Load: 24.5 t ADT: 30
Showing 1,501-1,550 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 |