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
SD022
FairOver: COBB CK
11.4 E JCT SD 15, Deuel, SD
Built 1954 Load: 28.1 t ADT: 793
472 AVENUE
FairOver: CK
6W & 2.1S MILBANK, Grant, SD
Built 2006 Load: 28.1 t ADT: 341
STATE PARK RD
FairOver: SPEARFISH CK
1.0 SE of Savoy via 14A, Lawrence, SD
Built 2006 Load: 28.1 t ADT: 100
WHITEWOOD VALLEY
FairOver: WHITEWOOD CK
6.5 NE WHITEWOOD, Lawrence, SD
Built 1963 Load: 28.1 t ADT: 300
478TH AVE, HWY 121
FairOver: SLIP-UP CREEK
3.5E & 2.7N RENNER, Minnehaha, SD
Built 1970 Load: 28.1 t ADT: 1,381
185 STREET
FairOver: MEDICINE KNOLL CK
14.2E ONIDA, Sully, SD
Built 1930 Load: 28.1 t ADT: 150
110th Street
FairOver: Maple River
2.7S & 0.8W of Frederick, Brown, SD
Built 1986 Load: 28.2 t ADT: 61
SECOND STREET
FairOver: BURLINGTON NORTHERN RR
0.5 N JCT US 12 ABERDEEN, Brown, SD
Built 2003 Load: 28.2 t ADT: 11,055
SD037
FairOver: CK
7.4 S JCT US 12, Brown, SD
Built 1953 Load: 28.2 t ADT: 1,082
46320 314 ST.
FairOver: CK
3.5N & 0.8W VERMILLION, Clay, SD
Built 1935 Load: 28.2 t ADT: 97
SD037
FairOver: TIMBER CK
1.8 N JCT SD 20 W, Spink, SD
Built 1955 Load: 28.2 t ADT: 960
IRR US018
FairOver: LITTLE WHITE RV
9.2 W JCT US 83 N, Todd, SD
Built 1989 Load: 28.2 t ADT: 1,387
47870 308 STR.
FairOver: WEST UNION CK
7S & 0.3W ALCESTER, Union, SD
Built 1957 Load: 28.2 t ADT: 35
204TH STREET
FairOver: BIG SIOUX RV
1S & 0.8W BRUCE, Brookings, SD
Built 1963 Load: 28.3 t ADT: 735
US014
FairOver: SOUTH MEDICINE CK
3.5 E OF BLUNT, Hughes, SD
Built 1951 Load: 28.3 t ADT: 1,933
29450 455 AVE
FairOver: FROG CK
1.0W & 3.5S VIBORG, Turner, SD
Built 2005 Load: 28.3 t ADT: 60
SD028
FairOver: CK
1.5 W MINNESOTA LINE, Deuel, SD
Built 1955 Load: 28.4 t ADT: 582
IRR COUNTY ROAD
FairOver: Creek
1.7 W 5.2 N LANTRY, Dewey, SD
Built 1965 Load: 28.4 t ADT: 55
US018 E
FairOver: HORSEHEAD CK
6 N JCT US 385 S, Fall River, SD
Built 1956 Load: 28.4 t ADT: 945
I090 WB ON RAMP
FairOver: SPEARFISH CK
0.3 W US 85 INTERCH, Lawrence, SD
Built 1971 Load: 28.4 t ADT: 1,428
SD262
FairOver: WOLF CK
0.7 SE HANSON CO LINE, McCook, SD
Built 1937 Load: 28.4 t ADT: 808
West 12th Street
FairOver: Skunk Creek
West of La Mesa Dr - SF, Minnehaha, SD
Built 1982 Load: 28.4 t ADT: 18,000
266 STREET
FairOver: THUNDER CK
5.3 E IDEAL, Tripp, SD
Built 1993 Load: 28.4 t ADT: 35
SD028
FairOver: SHUE CK
1.7 E SPINK CO LINE, Clark, SD
Built 2016 Load: 28.5 t ADT: 334
BUFFALO GAP ROAD
FairOver: CHEYENNE RV
1N & 1W ORAL, Fall River, SD
Built 1964 Load: 28.5 t ADT: 128
HIGGINS GULCH
FairOver: HIGGINS GULCH
T 6 N R 2 E SEC 7, Lawrence, SD
Built 1963 Load: 28.5 t ADT: 25
I090 W
FairOver: LONE ROCK CK
1.2 W MINNESOTA LINE, Minnehaha, SD
Built 1959 Load: 28.5 t ADT: 7,845
I090 E
FairOver: LONE ROCK CK
1.2 W MINNESOTA LINE, Minnehaha, SD
Built 1959 Load: 28.5 t ADT: 7,845
I029 S
FairOver: D&I RR
0.2 N OF W ELKPOINT INTCH, Union, SD
Built 1960 Load: 28.5 t ADT: 7,145
I029 N
FairOver: D&I RR
0.2 N OF W ELKPOINT INTCH, Union, SD
Built 1960 Load: 28.5 t ADT: 7,145
Kenel Road
FairOver: Oak Creek
0.1E JCT SD 63, Corson, SD
Built 1968 Load: 28.7 t ADT: 156
I090 W
FairOver: RC,P&E RR
0.2 SE US 14A INTERCH, Meade, SD
Built 1963 Load: 28.7 t ADT: 10,470
304th Avenue
FairOver: Creek
3W & 1.7S of Selby, Walworth, SD
Built 1959 Load: 28.7 t ADT: 180
FDR 140
FairOver: BOXELDER CREEK
T 3 N R 5 E SEC 28, Meade, SD
Built 1948 Load: 28.8 t ADT: 50
395TH AVE
FairOver: CREEK
0.9S FRANKFORT, Spink, SD
Built 1947 Load: 28.8 t ADT: 152
179TH ST
FairOver: James River
6S & 0.3E FRANKFORT, Spink, SD
Built 1986 Load: 28.8 t ADT: 36
US281
FairOver: ELM RV
3.7 S JCT SD 10 W, Brown, SD
Built 1959 Load: 28.9 t ADT: 2,795
I090 W
FairOver: BNSF RR
0.2 E SD 37 S INTERCH, Davison, SD
Built 1967 Load: 28.9 t ADT: 7,065
I090 E
FairOver: BNSF RR
0.2 E SD 37 S INTERCH, Davison, SD
Built 1967 Load: 28.9 t ADT: 7,065
IRR US012
FairOver: SNAKE CK
1.5 NW JCT SD 20, Corson, SD
Built 1966 Load: 29.0 t ADT: 1,102
CO RD 313 469TH AV
FairOver: HIDEWOOD CK
4.6 S 6.0W CLEAR LAKE, Deuel, SD
Built 1966 Load: 29.0 t ADT: 130
US085
FairOver: SPEARFISH CK
0.2 W CHEYENNE XING, Lawrence, SD
Built 1964 Load: 29.0 t ADT: 1,600
250TH ST, HWY 114
FairOver: DIVERSION DITCH
1.4W BALTIC, Minnehaha, SD
Built 1963 Load: 29.0 t ADT: 2,442
SD044
FairOver: RAPID CK
4.1 SW JCT SD 231, Pennington, SD
Built 1967 Load: 29.0 t ADT: 5,781
US018 E
FairOver: CHEYENNE RV
1 S JCT SD 79, Fall River, SD
Built 1958 Load: 29.1 t ADT: 1,867
SD063
FairOver: BAD RV
0.3 S JCT US 14, Haakon, SD
Built 1961 Load: 29.1 t ADT: 238
453rd Avenue
FairOver: BNSF Railroad
2E of Ortley, Roberts, SD
Built 1936 Load: 29.1 t ADT: 10
41170 291st Street
FairOver: Emanuel Creek
11.2W & 1N of Scotland, Bon Homme, SD
Built 1930 Load: 29.2 t ADT: 124
369TH AVE
FairOver: CK
4N VAYLAND, Hand, SD
Built 1960 Load: 29.2 t ADT: 206
SD248
FairOver: R&W RR
6.8 W JCT US 83 S, Jones, SD
Built 1937 Load: 29.2 t ADT: 129
Showing 1,951-2,000 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 |