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
407TH AVE.
FairOver: JAMES RV
1.7E & 3.2S FORESTBURG, Sanborn, SD
Built 1983 Load: 24.5 t ADT: 56
408TH AVE
FairOver: CK
3E 5.3N FORRESTBURG, Sanborn, SD
Built 1964 Load: 24.5 t ADT: 105
408TH AVE.
FairOver: REDSTONE CK
3E 2.4N FORESTBURG, Sanborn, SD
Built 1965 Load: 24.5 t ADT: 120
230TH ST.
FairOver: REDSTONE CK
3N & 2.3W ARTESIAN, Sanborn, SD
Built 1967 Load: 24.5 t ADT: 20
414TH AVE
FairOver: WEST REDSTONE CK
0.5E 3.9N ARTESIAN, Sanborn, SD
Built 1977 Load: 24.5 t ADT: 56
416TH AVE.
FairOver: WEST REDSTONE CK
1.5E 5N ARTESIAN, Sanborn, SD
Built 1963 Load: 24.5 t ADT: 56
375TH AVE
FairOver: CREEK
1.9N 5.0W ATHOL, Spink, SD
Built 1964 Load: 24.5 t ADT: 58
375TH AVE
FairOver: Wolf Creek
9W 2.6S TULARE, Spink, SD
Built 2009 Load: 24.5 t ADT: 55
165TH ST
FairOver: CREEK
1S 2.1 W ATHOL, Spink, SD
Built 1981 Load: 24.5 t ADT: 55
383RD AVE
FairOver: SLOUGH WATERWAY CK
3.2 S NORTHVILLE, Spink, SD
Built 1930 Load: 24.5 t ADT: 185
383RD AVE
FairOver: SNAKE CREEK
1 E 1.1 N ATHOL, Spink, SD
Built 1975 Load: 24.5 t ADT: 48
392ND AVE
FairOver: James River
1.3N 4.3W FRANKFORT, Spink, SD
Built 1978 Load: 24.5 t ADT: 31
395TH AVE
FairOver: CREEK
2N 1W FRANKFORT, Spink, SD
Built 1935 Load: 24.5 t ADT: 55
165TH ST
FairOver: DRY RUN CREEK
4S & 10.2W TURTON, Spink, SD
Built 2007 Load: 24.5 t ADT: 179
396TH AVE
FairOver: MUD CREEK
4.4N 0.6E BRENTFORD, Spink, SD
Built 1926 Load: 24.5 t ADT: 55
149TH ST
FairOver: MUD CREEK
1.0E 5.0N BRENTFORD, Spink, SD
Built 1930 Load: 24.5 t ADT: 55
160 ST
FairOver: CREEK
9.2W & 1N TURTON, Spink, SD
Built 1920 Load: 24.5 t ADT: 31
176TH ST
FairOver: TIMBER CREEK
3.0S & 2.9E FRANKFORT, Spink, SD
Built 1964 Load: 24.5 t ADT: 20
149TH SREET
FairOver: CREEK
4E & 5N BRENTFORD, Spink, SD
Built 1940 Load: 24.5 t ADT: 31
170TH STREET
FairOver: TIMBER CREEK
5.4 W 7 2 N OF DOLAND, Spink, SD
Built 1997 Load: 24.5 t ADT: 50
165TH STREET
FairOver: CREEK
7N & 4.8W DOLAND, Spink, SD
Built 2013 Load: 24.5 t ADT: 9
403rd Avenue
FairOver: FOSTER CREEK
3W & 1.5N BLOOMFIELD, Spink, SD
Built 1964 Load: 24.5 t ADT: 55
157TH STREET
FairOver: CREEK
3S & 2.5W CONDE, Spink, SD
Built 1967 Load: 24.5 t ADT: 15
405TH AVE
FairOver: FORDHAM CREEK
7.9N & 1W DOLAND, Spink, SD
Built 1940 Load: 24.5 t ADT: 11
405TH AVE
FairOver: CREEK
1.2N & 1W DOLAND, Spink, SD
Built 1940 Load: 24.5 t ADT: 31
180TH STREET
FairOver: CREEK
8S & 0.1W DOLAND, Spink, SD
Built 1940 Load: 24.5 t ADT: 50
181ST STREET
FairOver: CREEK
9S & 0.1W DOLAND, Spink, SD
Built 1933 Load: 24.5 t ADT: 50
406TH AVE
FairOver: FOSTER CREEK
13.6S DOLAND, Spink, SD
Built 1967 Load: 24.5 t ADT: 100
182ND STREET
FairOver: CREEK
10S & 0.3E DOLAND, Spink, SD
Built 1934 Load: 24.5 t ADT: 48
166TH STREET
FairOver: FORDHAM CREEK
6N & 0.9NE DOLAND, Spink, SD
Built 1955 Load: 24.5 t ADT: 19
166TH STREET
FairOver: CREEK
6N & 1.2E DOLAND, Spink, SD
Built 1962 Load: 24.5 t ADT: 19
175TH STREET
FairOver: CREEK
3S & 1.4E DOLAND, Spink, SD
Built 1945 Load: 24.5 t ADT: 45
168TH STREET
FairOver: FORDHAM CREEK
4N & 1.7E DOLAND, Spink, SD
Built 1950 Load: 24.5 t ADT: 44
181ST STREET
FairOver: CREEK
9N & 3.1E BLOOMFIELD, Spink, SD
Built 1945 Load: 24.5 t ADT: 50
182ND STREET
FairOver: FOSTER CREEK
10S & 3.4E DOLAND, Spink, SD
Built 1936 Load: 24.5 t ADT: 39
HWY 34 SERVICE RD
FairOver: CK
2.6 W HAYES, Stanley, SD
Built 1920 Load: 24.5 t ADT: 50
182 STREET
FairOver: CK
4W & 3N ONIDA, Sully, SD
Built 1960 Load: 24.5 t ADT: 49
306 AVENUE
FairOver: OKOBOJO CK
2E & 0.8S AGAR, Sully, SD
Built 1968 Load: 24.5 t ADT: 25
193 STREET
FairOver: CK
7S & 1.2E Onida, Sully, SD
Built 1968 Load: 24.5 t ADT: 25
309 AVENUE
FairOver: OKOBOJO CK
5E & 0.3N AGAR, Sully, SD
Built 1967 Load: 24.5 t ADT: 20
FAS 6155
FairOver: OKOBOJO CK
6.6E & 2.2N AGAR, Sully, SD
Built 1936 Load: 24.5 t ADT: 47
28190 441ST AVE
FairOver: TURKEY RIDGE CK
6W & 7.9S MARION, Turner, SD
Built 1989 Load: 24.5 t ADT: 97
26960 444 AVE
FairOver: WEST FORK VERMILLION RV
0.6S & 3E DOLTON, Turner, SD
Built 1990 Load: 24.5 t ADT: 97
27140 446 AVE
FairOver: WEST FORK VERMILLION RV
1.6N & 1W MARION, Turner, SD
Built 1998 Load: 24.5 t ADT: 100
44690 272 ST
FairOver: WEST FORK VERMILLION RV
1N & 0.1W MARION, Turner, SD
Built 1999 Load: 24.5 t ADT: 50
27220 448 AVE
FairOver: WEST FORK VERMILLION RV
2.8N & 5W PARKER, Turner, SD
Built 1995 Load: 24.5 t ADT: 50
28499 449TH AVE
FairOver: TURKEY RIDGE CK
7W & 6N VIBORG, Turner, SD
Built 1992 Load: 24.5 t ADT: 50
45220 268 ST.
FairOver: EAST FORK VERMILLION RV
7N & 0.8W PARKER, Turner, SD
Built 1970 Load: 24.5 t ADT: 20
28570 454 AVE
FairOver: TURKEY RIDGE CK
2W & 5.3N VIBORG, Turner, SD
Built 1988 Load: 24.5 t ADT: 35
45670 289 ST.
FairOver: TURKEY RIDGE CK
2N & 0.7E VIBORG, Turner, SD
Built 1986 Load: 24.5 t ADT: 200
Showing 1,651-1,700 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 |