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
30070 474TH AVE
FairOver: WEST BRULE CK
2E & 2.7S BERESFORD, Union, SD
Built 1982 Load: 30.1 t ADT: 40
SD048
FairOver: EAST UNION CK
2.1 W IOWA STATE LINE, Union, SD
Built 1960 Load: 30.1 t ADT: 1,134
SD037
FairOver: MUD CK
4.4 S JCT US 12, Brown, SD
Built 1953 Load: 30.2 t ADT: 1,140
40260 312th Street
FairOver: Choteau Creek
15.0SE of Greenwood, Charles Mix, SD
Built 1974 Load: 30.2 t ADT: 50
IRR US012
FairOver: GRAND RV
8.2 NW JCT SD 20, Corson, SD
Built 1960 Load: 30.2 t ADT: 426
252ND ST, HWY 118
FairOver: SKUNK CK
0.6N & 0.6W LYONS, Minnehaha, SD
Built 1964 Load: 30.2 t ADT: 798
SD231
FairOver: RAPID CK
0.1 E JCT SD 445, Pennington, SD
Built 1974 Load: 30.2 t ADT: 20,057
SD030
FairOver: BR NORTH DEER CK
0.8 W I 29 INTERCH, Brookings, SD
Built 1957 Load: 30.3 t ADT: 945
SD079
FairOver: COTTONWOOD CK
0.5 N MEADE CO LINE, Butte, SD
Built 1954 Load: 30.3 t ADT: 2,199
US281
FairOver: SAND CK
1.3 S BEADLE CO LINE, Jerauld, SD
Built 1958 Load: 30.3 t ADT: 1,315
SD011
FairOver: SPLIT ROCK CK
0.2W & 3S BRANDON, Minnehaha, SD
Built 1963 Load: 30.3 t ADT: 3,982
SD020
FairOver: SNAKE CK
3.3 E FAULK CO LINE, Spink, SD
Built 1959 Load: 30.3 t ADT: 975
SD020
FairOver: SNAKE CK
4.3 E FAULK CO LINE, Spink, SD
Built 1959 Load: 30.3 t ADT: 975
SD020
FairOver: TRIB TO TIMBER CK
1.8 W JCT SD 37, Spink, SD
Built 1958 Load: 30.3 t ADT: 592
US014
FairOver: PLUM CK
1.9 S JCT SD 34, Stanley, SD
Built 1960 Load: 30.3 t ADT: 749
US018
FairOver: CHEYENNE RV
AT EDGEMONT, Fall River, SD
Built 1979 Load: 30.5 t ADT: 2,416
US014
FairOver: CK
4.0 E HYDE CO LINE, Hand, SD
Built 1935 Load: 30.5 t ADT: 1,935
US085
FairOver: SOUTH FORK GRAND RV
0.2 S JCT SD 20 W, Harding, SD
Built 1963 Load: 30.5 t ADT: 1,452
28270 443RD AVE
FairOver: TURKEY RIDGE CK
4W & 8.7S MARION, Turner, SD
Built 1970 Load: 30.5 t ADT: 91
THUNDER BUTTE ROAD
FairOver: THUNDER BUTTE CK
12 N 5 W DUPREE, Ziebach, SD
Built 1969 Load: 30.5 t ADT: 143
SNOMA RD
FairOver: STINKINGWATER CK
1.0 W 2 S OF NISLAND, Butte, SD
Built 1969 Load: 30.6 t ADT: 149
US016
FairOver: NEWTON FORK CK
0.3N & 0.4E HILL CITY, Pennington, SD
Built 1995 Load: 30.6 t ADT: 6,642
SD013
FairOver: BIG SIOUX RV
0.3 N OF FLANDREAU, Moody, SD
Built 1964 Load: 30.7 t ADT: 1,135
DARK CANYON ROAD
FairOver: RAPID CK
1.7W 0.8S FISH HATCH, Pennington, SD
Built 1972 Load: 30.7 t ADT: 262
DARK CANYON ROAD
FairOver: RAPID CK
1.3W 0.9S FISH HATCH, Pennington, SD
Built 1972 Load: 30.7 t ADT: 262
409TH AVE
FairOver: FORDHAM CREEK
6.1N & 3E DOLAND, Spink, SD
Built 1935 Load: 30.7 t ADT: 36
204TH STREET
FairOver: BR NORTH DEER CK
.7M S. & 3.8M E. OF BRUCE, Brookings, SD
Built 1962 Load: 30.8 t ADT: 735
Diversion Dam Road
FairOver: Inlet Canal
1.3 mi NE Belle Fourche, Butte, SD
Built 1906 Load: 30.8 t ADT: 1
IRR BIA RTE 3
FairOver: HAND BOY CREEK
3.2KM W OF RTE 7 JUNCTION, Dewey, SD
Built 1964 Load: 30.8 t ADT: 200
SD020
FairOver: CK
4.1 E JCT SD 15, Grant, SD
Built 1956 Load: 30.8 t ADT: 249
333 AVENUE
FairOver: BULL CK
4W & 2.6N JCT 44&47, Gregory, SD
Built 1965 Load: 30.8 t ADT: 96
41130 277 ST.
FairOver: NORTH BR DRY CK
2S 1.3E PARKSTON, Hutchinson, SD
Built 1982 Load: 30.8 t ADT: 45
I090 W
FairOver: TRIB TO WILLOW CK
1.9 W I 29 INTERCH, Minnehaha, SD
Built 1961 Load: 30.8 t ADT: 8,550
I090 E
FairOver: TRIB TO WILLOW CK
1.9 W I 29 INTERCH, Minnehaha, SD
Built 1961 Load: 30.8 t ADT: 8,550
41st Street
FairOver: Big Sioux River
west of Kiwanis Avenue, Minnehaha, SD
Built 2010 Load: 30.8 t ADT: 28,160
TOWNSHIP RD
FairOver: TRIB TO CHEYENNE RIVER
0.2 N IMLAY, Pennington, SD
Built 1930 Load: 30.8 t ADT: 15
SD048 EF
FairOver: CK
0.3 W I29 & SD48 INTERCH, Union, SD
Built 1961 Load: 30.8 t ADT: 100
IRR SD1806
FairOver: OAHE LK (GRAND RV)
0.4 N JCT US 12, Corson, SD
Built 1963 Load: 30.9 t ADT: 915
256TH STREET
FairOver: BIG SIOUX RIVER
2N & 0.9W RENNER, Minnehaha, SD
Built 1975 Load: 30.9 t ADT: 45
North Drive
FairOver: BNSF Railroad
0.2E of Minnesota Ave-SF, Minnehaha, SD
Built 1990 Load: 30.9 t ADT: 13,000
148TH STREET
FairOver: CREEK
0.5W VERDON, Spink, SD
Built 1935 Load: 30.9 t ADT: 96
39370 295th Street
FairOver: Choteau Creek
2.0N & 1.3W of Wagner, Charles Mix, SD
Built 1998 Load: 31.0 t ADT: 48
349TH AVE
FairOver: SOUTH FORK SNAKE CK
4W & 0.3S FAULKTON, Faulk, SD
Built 1982 Load: 31.0 t ADT: 36
I090 W
FairOver: SPEARFISH CK
0.3 W US 85 INTERCH, Lawrence, SD
Built 1971 Load: 31.0 t ADT: 5,365
DARK CANYON ROAD
FairOver: RAPID CK
2.1W 0.7S FISH HATCH, Pennington, SD
Built 1972 Load: 31.0 t ADT: 262
S. AIRPORT ROAD
FairOver: RAPID CK
4 W & 1.4 N CAPUTA, Pennington, SD
Built 1973 Load: 31.0 t ADT: 27
48580 COUNTY RD 13
FairOver: BIG SIOUX RV
6.5E & 1.9S ALCESTER, Union, SD
Built 1979 Load: 31.0 t ADT: 500
137th Street
FairOver: James River
4.6S & 1.5E of Bath, Brown, SD
Built 1967 Load: 31.1 t ADT: 67
State Highway 281
FairOver: FT. RANDALL SPILLWAY
1 Mile West of Pickstown, Charles Mix, SD
Built 1956 Load: 31.1 t ADT: 954
SD015
FairOver: BR WHETSTONE RV
3.6 N JCT US 12, Grant, SD
Built 1957 Load: 31.2 t ADT: 1,258
Showing 2,051-2,100 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 |