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
North Drive
FairOver: Big Sioux Diversion
W of 4th Avenue - SF, Minnehaha, SD
Built 1991 Load: 25.1 t ADT: 9,900
240th Street
FairOver: Big Sioux River
3rd Street in Trent, Moody, SD
Built 2004 Load: 25.1 t ADT: 555
IRR US018
FairOver: WOLF CK
0.3 N OF PINE RIDGE, Oglala Lakota, SD
Built 2006 Load: 25.1 t ADT: 5,380
IRR US018
FairOver: STINKING WATER CK
4.8 NE JCT SD 391, Oglala Lakota, SD
Built 1948 Load: 25.1 t ADT: 1,168
SD044
FairOver: RAPID CK
4.6 SE JCT US 385, Pennington, SD
Built 1958 Load: 25.1 t ADT: 1,445
SD231
FairOver: HIGH CK
0.2 S MEADE CO LINE, Pennington, SD
Built 1947 Load: 25.1 t ADT: 9,148
BIG FOOT RD
FairOver: WHITEWATER CK
3.4 E 6.8 S QUINN, Pennington, SD
Built 1963 Load: 25.1 t ADT: 79
SD020
FairOver: CK
0.2 S JCT SD 20 W & 37, Spink, SD
Built 1955 Load: 25.1 t ADT: 878
US183
FairOver: CK
1.5 S JCT US 18, Tripp, SD
Built 1948 Load: 25.1 t ADT: 698
US183
FairOver: CK
5.4 S OF COLOME, Tripp, SD
Built 1948 Load: 25.1 t ADT: 698
IRR US212
FairOver: CK
0.4 E JCT SD 65 N, Ziebach, SD
Built 1954 Load: 25.1 t ADT: 1,272
BEET RD
FairOver: INDIAN CK
3 W 6 N NISLAND, Butte, SD
Built 2011 Load: 25.2 t ADT: 66
SD034
FairOver: BR CROW CK
1.1 E BUFFALO CO LINE, Jerauld, SD
Built 1952 Load: 25.2 t ADT: 513
BIG FOOT RD
FairOver: COTTONWOOD CK
3.4 E 1 S QUINN, Pennington, SD
Built 1962 Load: 25.2 t ADT: 44
SD271
FairOver: HIDDENWOOD CK
4.2 N OF JAVA, Walworth, SD
Built 1953 Load: 25.2 t ADT: 133
US014
FairOver: PEARL CK OVERFLOW
2.6 E OF CAVOUR, Beadle, SD
Built 1965 Load: 25.3 t ADT: 1,883
SD037
FairOver: NORTH BR TWELVE MILE CK
2.3 N JCT SD 42, Davison, SD
Built 1946 Load: 25.3 t ADT: 3,929
TRIPLE CREEK RD.
FairOver: SULPHUR CK
3E & 15.6S MAURINE, Meade, SD
Built 1940 Load: 25.3 t ADT: 17
I029 N
FairOver: CK, BURLINGTON NOR RR
4.8 S SD 20 INTERCH, Codington, SD
Built 1974 Load: 25.4 t ADT: 4,175
476 AVENUE
FairOver: NORTH FORK YELLOW BANK R
8E & 1.1S MILBANK, Grant, SD
Built 1964 Load: 25.4 t ADT: 43
3RD STREET
FairOver: BATTLE CK
0.3E JCT 16A/40 KEYSTONE, Pennington, SD
Built 1974 Load: 25.4 t ADT: 125
45390 280 ST
FairOver: CK
5 S 0.6 E PARKER, Turner, SD
Built 1935 Load: 25.4 t ADT: 403
IRR SD063
FairOver: MOREAU RV
13 N JCT US 212, Dewey, SD
Built 1971 Load: 25.5 t ADT: 767
SD079
FairOver: SOUTH FORK GRAND RV
6.5 N JCT SD 20, Harding, SD
Built 1957 Load: 25.5 t ADT: 357
SD025
FairOver: ROY LK INLET
2.5 S JCT SD 10, Marshall, SD
Built 1959 Load: 25.5 t ADT: 550
SD010
FairOver: NORTH BR WILLOW CK
6.6 E JCT SD 45 S, McPherson, SD
Built 1957 Load: 25.5 t ADT: 762
IRR SD1806
FairOver: OAK CK
5.7 N JCT US 12, Corson, SD
Built 1963 Load: 25.6 t ADT: 408
SD022
FairOver: COBB CK
8.7 E JCT SD 15, Deuel, SD
Built 1955 Load: 25.6 t ADT: 1,030
SD042
FairOver: NORTH BR TWELVE MILE CK
1.7 E DAVISON CO LINE, Hanson, SD
Built 1958 Load: 25.6 t ADT: 474
SD034
FairOver: SILVER CK
1.8 E & S JCT US 81 N, Lake, SD
Built 2000 Load: 25.6 t ADT: 8,559
288th Street
FairOver: Saddle Creek
8S & 0.7E of Worthing, Lincoln, SD
Built 1963 Load: 25.6 t ADT: 327
W. ORAL ROAD
FairOver: ANGOSTURA MAIN CANAL
3S & 6W ORAL, Fall River, SD
Built 1974 Load: 25.7 t ADT: 500
US014
FairOver: LONE TREE CK
3.2 S STANLEY CO LINE, Haakon, SD
Built 1960 Load: 25.7 t ADT: 714
SD034
FairOver: SMITH CK
7.6 W WESSINGTON SPRINGS, Jerauld, SD
Built 1952 Load: 25.7 t ADT: 513
205TH ST
FairOver: SOUTH FORK PEARL CK
3 N & 0.4 E IROQUOIS, Kingsbury, SD
Built 1967 Load: 25.7 t ADT: 12
248TH ST, HWY 110
FairOver: BIG SIOUX RIVER
1.2W & 2.3S DELL RAPIDS, Minnehaha, SD
Built 1964 Load: 25.7 t ADT: 324
291 AVENUE
FairOver: OKOBOJO CK
3.5E & 0.6N OKOBOJO, Sully, SD
Built 1936 Load: 25.7 t ADT: 250
SD037
FairOver: CK
1.6 N JCT SD 50, Bon Homme, SD
Built 1958 Load: 25.8 t ADT: 1,327
IRR SD063
FairOver: GRAND RV
11.3 S OF MCLAUGHLIN, Corson, SD
Built 1970 Load: 25.8 t ADT: 223
US018
FairOver: HORSEHEAD CK
0.6 E JCT US 385 S, Fall River, SD
Built 1953 Load: 25.8 t ADT: 676
26950 414 AVE.
FairOver: SOUTH FORK TWELVE MILE C
3 E DIMOCK S.D., Hutchinson, SD
Built 1989 Load: 25.8 t ADT: 69
SD010
FairOver: FOOT CK
1.4 E JCT SD 45 S, McPherson, SD
Built 1957 Load: 25.8 t ADT: 762
SD037
FairOver: TRIB TO TIMBER CK
1.8 S JCT SD 20 E, Spink, SD
Built 1956 Load: 25.8 t ADT: 445
SD037
FairOver: BR FOSTER CK
3.4 S JCT SD 20 E, Spink, SD
Built 1956 Load: 25.8 t ADT: 445
45460 272 ST
FairOver: EAST FORK VERMILLION RV
3N & 1.6E PARKER, Turner, SD
Built 1967 Load: 25.8 t ADT: 308
302ND ST.
FairOver: FROG CK
4.4E WAKONDA, Clay, SD
Built 1980 Load: 25.9 t ADT: 232
365TH AVE
FairOver: SOUTH FORK SNAKE CK
3.4E & 5.7S CRESBARD, Faulk, SD
Built 1985 Load: 25.9 t ADT: 36
SD022
FairOver: BIG SIOUX RV
3.2 E JCT US 81, Hamlin, SD
Built 1957 Load: 25.9 t ADT: 988
SD034
FairOver: MEDICINE KNOLL CK
14.3 E JCT US 14 & 83, Hughes, SD
Built 1964 Load: 25.9 t ADT: 1,566
STATE HWY 47
FairOver: BIG BEND DAM POWERHOUSE
2 Mi. So. of Ft. Thompson, Lyman, SD
Built 1964 Load: 25.9 t ADT: 454
Showing 1,801-1,850 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 |