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
I029 S
UnknownOver: 164 ST (FAS 6287)
8 N US 212 INTERCHANGE, Codington, SD
Built 1973 ADT: 488
166 ST
UnknownOver: I029
6 N US 212 INTERCH, Codington, SD
Built 1973 ADT: 7,370
US081
UnknownOver: I029
3 N US 212 INTERCHANGE, Codington, SD
Built 1973 ADT: 7,370
I029 N
UnknownOver: US212
US 212 & I 29 INTERCHANGE, Codington, SD
Built 1971 ADT: 10,616
I029 N
UnknownOver: 164 ST (FAS 6287)
8 N US 212 INTERCHANGE, Codington, SD
Built 1973 ADT: 488
I029 N
UnknownOver: 458 AVE
2.3 SE US 212 INTERCH, Codington, SD
Built 1972 ADT: 38
I029 S
UnknownOver: 458 AVE
2.3 SE US 212 INTERCH, Codington, SD
Built 1972 ADT: 38
176 ST
UnknownOver: I029
2.9 N HAMLIN CO LINE, Codington, SD
Built 1972 ADT: 6,970
395 AVE
UnknownOver: I090
1.0 E AURORA CO LINE, Davison, SD
Built 1965 ADT: 9,890
397 AVE (FAS 6219)
UnknownOver: I090
MT VERNON INTERCHANGE, Davison, SD
Built 1965 ADT: 9,890
399 AVE
UnknownOver: I090
2.0 E MT VERNON INTERCH, Davison, SD
Built 1965 ADT: 9,800
401 AVE
UnknownOver: I090
4.0 E MT VERNON INTERCHAN, Davison, SD
Built 1965 ADT: 9,800
403 AVE (FAS 6221)
UnknownOver: I090
6 E MT VERNON INTERCHANGE, Davison, SD
Built 1965 ADT: 9,800
406 AVE (FAS 6351)
UnknownOver: I090
2.3 W SD 37 N INTERCH, Davison, SD
Built 1965 ADT: 9,540
SD037
UnknownOver: I090
SD 37 N INTERCHANGE, Davison, SD
Built 1966 ADT: 11,480
SD037
UnknownOver: 4TH AVE, BNSF RR
1.4 N I 90 INTERCHANGE, Davison, SD
Built 1997 ADT: 50
I090 W
UnknownOver: SOUTH ROWLEY ST
0.8 W SD 37 S INTERCH, Davison, SD
Built 1965 ADT: 900
I090 E
UnknownOver: SOUTH ROWLEY ST
0.8 W SD 37 S INTERCH, Davison, SD
Built 1965 ADT: 900
BNSF RR
UnknownOver: S BURR ST
S. BURR ST., Davison, SD
Built 1990 ADT: 7,125
SO DAK OWNED RR
UnknownOver: S BURR ST
S. BURR ST., Davison, SD
Built 1990 ADT: 7,125
I090 W
UnknownOver: SD037S
SD37S INTERCH, Davison, SD
Built 1966 ADT: 13,468
I090 E
UnknownOver: SD037S
SD37S INTERCHANGE, Davison, SD
Built 1966 ADT: 13,468
BURL NORTHERN RR
UnknownOver: COUNTY ROAD
4W &.6N ANDOVER, Day, SD
Built 1910 ADT: 69
BURL NORTHERN RR
UnknownOver: COUNTY ROAD
3W &.3N ANDOVER, Day, SD
Built 1912 ADT: 23
BURL NORTHERN RR
UnknownOver: COUNTY ROAD
5S & 1.3E ANDOVER, Day, SD
Built 1910 ADT: 192
I029 S
UnknownOver: 184 ST
2.5 SE SD 22 INTERCH, Deuel, SD
Built 1973 ADT: 73
I029 N
UnknownOver: 184 ST
2.5 SE SD 22 INTERCH, Deuel, SD
Built 1973 ADT: 73
I029 S
UnknownOver: 186A ST, HIDEWOOD CK
5.5 SE SD 22 INTERCH, Deuel, SD
Built 1973 ADT: 10
I029 N
UnknownOver: 186A ST, HIDEWOOD CK
5.5 SE SD 22 INTERCH, Deuel, SD
Built 1973 ADT: 10
I029 S
UnknownOver: 469 AVE (FASC 6373)
6 SE SD 22 INTERCH, Deuel, SD
Built 1973 ADT: 130
I029 N
UnknownOver: 469 AVE (FASC 6373)
6 SE SD 22 INTERCH, Deuel, SD
Built 1973 ADT: 130
I029 S
UnknownOver: 188 ST (FASC 6308)
6.9 NW SD 28 INTERCHANGE, Deuel, SD
Built 1973 ADT: 122
I029 N
UnknownOver: 188 ST (FASC 6308)
6.9 NW SD 28 INTERCHANGE, Deuel, SD
Built 1973 ADT: 122
I029 S
UnknownOver: 471 AVE
3.5 NW SD 28 INTERCH, Deuel, SD
Built 1973 ADT: 100
I029 N
UnknownOver: 471 AVE
3.5 NW SD 28 INTERCH, Deuel, SD
Built 1973 ADT: 100
SD028
UnknownOver: I029
SD 28 INTERCHANGE, Deuel, SD
Built 1970 ADT: 7,490
US018
UnknownOver: BURLINGTON NOR RR, CO RD
NE EDGE OF EDGEMONT, Fall River, SD
Built 1978 ADT: 41
US385 NF
UnknownOver: GARDEN ST
0.2 W JCT US 385, Fall River, SD
Built 1982 ADT: 141
IRR I029 S
UnknownOver: 146 ST
2 S ROBERTS CO LINE, Grant, SD
Built 1977 ADT: 120
IRR I029 N
UnknownOver: 146 ST
2 S ROBERTS CO LINE, Grant, SD
Built 1977 ADT: 120
IRR I029 S
UnknownOver: 149 ST (FAS 6266)
6.2 S US 12 INTERCHANGE, Grant, SD
Built 1976 ADT: 274
I029 S
UnknownOver: 152 ST
2 N CODINGTON CO LINE, Grant, SD
Built 1977 ADT: 34
IRR I029 N
UnknownOver: 149 ST (FAS 6266)
6.2 S US 12 INTERCHANGE, Grant, SD
Built 1976 ADT: 274
I029 N
UnknownOver: 152 ST
2 N CODINGTON CO LINE, Grant, SD
Built 1976 ADT: 34
I029 S
UnknownOver: 462 AVE
NORTH COUNTY LINE, Hamlin, SD
Built 1973 ADT: 66
I029 N
UnknownOver: 462 AVE
NORTH COUNTY LINE, Hamlin, SD
Built 1973 ADT: 66
464 AVE (FAS 6499)
UnknownOver: I029
2.8 NW SD 22 INTERCH, Hamlin, SD
Built 1973 ADT: 6,970
I029 S
UnknownOver: SD022
SD 22 & I 29 INTERCHANGE, Hamlin, SD
Built 1973 ADT: 826
I029 N
UnknownOver: SD022
SD 22 & I 29 INTERCHANGE, Hamlin, SD
Built 1973 ADT: 1,723
I090 W
UnknownOver: SD038 P
3.2 E SD 37 S INTERCHANGE, Hanson, SD
Built 1965 ADT: 1,786
Showing 51-100 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 |