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
KIWANIS AVE
UnknownOver: I090
0.5 E I 29 INTERCH, Minnehaha, SD
Built 1961 ADT: 18,250
I229
UnknownOver: W 57TH ST
0.4 SW WESTERN AV INTERCH, Minnehaha, SD
Built 1995 ADT: 14,000
WESTERN AVE
UnknownOver: I229
WESTERN AVE INTERCHANGE, Minnehaha, SD
Built 1995 ADT: 34,780
I090 W
UnknownOver: BIG SIOUX RV, DITCH RD
1.3 E I 29 INTERCH, Minnehaha, SD
Built 1992 ADT: 25
I090 E
UnknownOver: BIG SIOUX RV, DITCH RD
1.3 E I 29 INTERCH, Minnehaha, SD
Built 1993 ADT: 25
I229 S
UnknownOver: S MINNESOTA AVE
MINNESOTA AVE INTERCHANGE, Minnehaha, SD
Built 1959 ADT: 21,430
I229 N
UnknownOver: S MINNESOTA AVE
MINNESOTA AVE INTERCHANGE, Minnehaha, SD
Built 1959 ADT: 17,310
11th Street
UnknownOver: 3rd Ave,Big Sioux Rvr,RR
east of 2nd Avenue - SF, Minnehaha, SD
Built 1971 ADT: 100
I090 W
UnknownOver: CLIFF AVE
CLIFF AVENUE INTERCHANGE, Minnehaha, SD
Built 2013 ADT: 18,142
I090 E
UnknownOver: CLIFF AVE
CLIFF AVENUE INTERCHANGE, Minnehaha, SD
Built 2013
BURL NORTHERN RR
UnknownOver: CLIFF AVE
0.8 N JCT SD42, Minnehaha, SD
Built 1990 ADT: 12,375
I229 S
UnknownOver: S CLIFF AVE
CLIFF AVE INTERCHANGE, Minnehaha, SD
Built 1959 ADT: 19,962
I229 N
UnknownOver: S CLIFF AVE
CLIFF AVE INTERCHANGE, Minnehaha, SD
Built 1959 ADT: 19,962
E 26TH ST
UnknownOver: I229
26TH ST INTERCHANGE, Minnehaha, SD
Built 1985 ADT: 40,220
I229 S
UnknownOver: SE AVE, BNSFRR
0.4 NE 26 ST INTERCH, Minnehaha, SD
Built 1997 ADT: 17,925
I229 S
UnknownOver: E RICE ST, BUR NOR RR
RICE ST INTERCHANGE, Minnehaha, SD
Built 1994 ADT: 13,938
I229 N
UnknownOver: SE AVE, BNSFRR
0.4 NE 26 ST INTERCH, Minnehaha, SD
Built 1998 ADT: 17,925
26th Street
UnknownOver: Big Sioux River, BNSFRR
W of Southeastern Avenue, Minnehaha, SD
Built 2020
E BENSON RD
UnknownOver: I229
BENSON RD. INTERCHANGE, Minnehaha, SD
Built 1991 ADT: 27,550
I229 N
UnknownOver: E RICE ST, BUR NOR RR
RICE ST INTERCHANGE, Minnehaha, SD
Built 1994 ADT: 13,938
E 6TH ST
UnknownOver: I229
6TH ST OVERHEAD, Minnehaha, SD
Built 1992 ADT: 30,180
E 10TH ST
UnknownOver: I229
10TH & I229 INTERCHANGE, Minnehaha, SD
Built 1995 ADT: 30,180
E 12TH ST
UnknownOver: I229
12TH ST OVERHEAD, Minnehaha, SD
Built 1997 ADT: 34,860
E 18TH ST
UnknownOver: I229
18TH ST OVERHEAD, Minnehaha, SD
Built 1959 ADT: 34,860
I090 W
UnknownOver: I229
I 90 & I 229 INTERCHANGE, Minnehaha, SD
Built 1999 ADT: 15,800
I090 E
UnknownOver: I229
I 90 & I 229 INTERCHANGE, Minnehaha, SD
Built 1999 ADT: 15,800
E 60TH ST N
UnknownOver: I229
0.3 S I 90 INTERCH, Minnehaha, SD
Built 2023 ADT: 15,800
478 AVE (FAS 1157)
UnknownOver: I090
2 E I 229 INTERCHANGE, Minnehaha, SD
Built 2019 ADT: 19,640
SD011
UnknownOver: I090
SD 11 & I 90 INTERCHANGE, Minnehaha, SD
Built 1960 ADT: 13,520
484 AVE
UnknownOver: I090
2 E SD 11 INTERCH, Minnehaha, SD
Built 1959 ADT: 13,520
486 AVE (FAS 6347)
UnknownOver: I090
4.0 E SD 11 INTERCHANGE, Minnehaha, SD
Built 1959 ADT: 13,520
I029 S
UnknownOver: 223 ST (FAS)
7 N SD 32 INTERCHANGE, Moody, SD
Built 1966 ADT: 766
225 ST
UnknownOver: I029
5 S BROOKINGS CO LINE, Moody, SD
Built 1966 ADT: 13,050
I029 S
UnknownOver: 228 ST
8 S BROOKINGS CO LINE, Moody, SD
Built 1967 ADT: 50
I029 S
UnknownOver: 232 ST
3 N SD 34 INTERCH, Moody, SD
Built 1967 ADT: 50
I029 S
UnknownOver: 233 ST
2 N SD 34 INTERCH, Moody, SD
Built 1967 ADT: 50
SD034
UnknownOver: I029
SD 34 INTERCHANGE, Moody, SD
Built 1963 ADT: 12,960
I029 S
UnknownOver: 238 ST
3 S SD 34 INTERCH, Moody, SD
Built 1963 ADT: 70
240 ST (FAS 6334)
UnknownOver: I029
5 S SD 34 INTERCHANGE, Moody, SD
Built 1963 ADT: 15,650
241 ST
UnknownOver: I029
3.2 N MINNEHAHA CO LINE, Moody, SD
Built 1963 ADT: 15,650
I029 S
UnknownOver: 243 ST
1.2 N MINNEHAHA CO LINE, Moody, SD
Built 1963 ADT: 130
I029 N
UnknownOver: 223 ST (FAS)
7 N SD 32 INTERCHANGE, Moody, SD
Built 1966 ADT: 766
I029 N
UnknownOver: 228 ST
8 S BROOKINGS CO LINE, Moody, SD
Built 1967 ADT: 50
SD032
UnknownOver: I029
SD 32 INTERCHANGE, Moody, SD
Built 1967 ADT: 13,050
I029 N
UnknownOver: 232 ST
3 N SD 34 INTERCH, Moody, SD
Built 1967 ADT: 50
I029 N
UnknownOver: 233 ST
2 N SD 34 INTERCH, Moody, SD
Built 1967 ADT: 50
I029 N
UnknownOver: 238 ST
3 S SD 34 INTERCH, Moody, SD
Built 1963 ADT: 70
I029 N
UnknownOver: 243 ST
1.2 N MINNEHAHA CO LINE, Moody, SD
Built 1963 ADT: 130
MICKELSON TRAIL
UnknownOver: US16 & US385
0.1N OF JCT SD87, Pennington, SD
Built 1937 ADT: 5,204
PALMER CK RD
UnknownOver: PALMER CK RD
1.4E 2.7S HILL CITY, Pennington, SD
Built 2009 ADT: 106
Showing 301-350 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 |