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

Total Bridges

5,905

Public highway bridges in South Dakota

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)

South Dakota31.922099915325997%44.06435224386113%16.240474174428453%16.240474174428453%GoodFairPoorStructurally Deficient
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
Structure
Progressive
Burden @ $100K
$59

54

West Virginia

16.02% top marginal rate
Structure
Progressive
Burden @ $100K
$7,679
Selected

46

South Dakota

16.24% top marginal rate
Structure
Progressive
Burden @ $100K
$5,905

19

Iowa

20.01% top marginal rate
Structure
Progressive
Burden @ $100K
$20,753

78

Virgin Islands

29.17% top marginal rate
Structure
Progressive
Burden @ $100K
$24

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 Deficient

Over: WHETSTONE RV

4.8E & 3.2N MILBANK, Grant, SD

Built 1962 Load: 0.9 t ADT: 25

202ND ST.

Structurally Deficient

Over: BEAR BUTTE CK

5.3E BEAR BUTTE, Meade, SD

Built 2000 Load: 0.9 t ADT: 50

45980 303 ST.

Structurally Deficient

Over: VERMILLION RV

6S & 7.8E IRENE, Clay, SD

Built 1909 Load: 1.8 t ADT: 15

460th Avenue

Structurally Deficient

Over: Big Coulee Creek

4S & 2W of Peever, Roberts, SD

Built 1950 Load: 2.2 t ADT: 22

197TH ST

Structurally Deficient

Over: TURTLE CK

1N & 1E ST LAWRENCE, Hand, SD

Built 1925 Load: 2.5 t ADT: 25

242 ST

Structurally Deficient

Over: CK

1.8E 11.0N PLANKINTON, Aurora, SD

Built 1917 Load: 2.7 t ADT: 101

All Bridges in South Dakota

265TH STREET

Fair

Over: TRIB TO FOUR MILE CK

3S & 2.4W VALLEY SPRINGS, Minnehaha, SD

Built 1983 Load: 19.6 t ADT: 51

485TH AVENUE

Fair

Over: TRIB TO SPLIT ROCK CK

3E & 2.7N CORSON, Minnehaha, SD

Built 1990 Load: 19.6 t ADT: 18

485TH AVENUE

Fair

Over: FOUR MILE CREEK

2W & 2.8S VALLEY SPRINGS, Minnehaha, SD

Built 1993 Load: 19.6 t ADT: 13

485TH AVENUE

Fair

Over: TRIB TO FOUR MILE CK

2W & 3.4S VALLEY SPRINGS, Minnehaha, SD

Built 1981 Load: 19.6 t ADT: 14

263RD STREET

Fair

Over: BEAVER CREEK

1.8W & 1S VALLEY SPRINGS, Minnehaha, SD

Built 1977 Load: 19.6 t ADT: 15

257TH STREET

Fair

Over: TRIB TO SPLIT ROCK CK

4S & 0.5E GARRETSON, Minnehaha, SD

Built 1938 Load: 19.6 t ADT: 19

486TH AVENUE

Fair

Over: PIPESTONE CREEK

1W & 3.5N SHERMAN, Minnehaha, SD

Built 1979 Load: 19.6 t ADT: 33

486TH AVENUE

Fair

Over: FOUR MILE CREEK

2.5S & 1W VALLEY SPRINGS, Minnehaha, SD

Built 1992 Load: 19.6 t ADT: 15

261ST STREET

Fair

Over: TRIB TO BEAVER CK

1N & 0.3W VALLEY SPRINGS, Minnehaha, SD

Built 1978 Load: 19.6 t ADT: 62

487TH AVE, HWY 103

Fair

Over: PIPESTONE CREEK

3.4N SHERMAN, Minnehaha, SD

Built 1990 Load: 19.6 t ADT: 217

487TH AVE, HWY 103

Fair

Over: FOUR MILE CREEK

2.6S VALLEY SPRINGS, Minnehaha, SD

Built 1987 Load: 19.6 t ADT: 535

395TH AVE

Fair

Over: MUD CREEK

3.7 N BRENTFORD, Spink, SD

Built 1956 Load: 19.6 t ADT: 302

44970 287TH ST.

Fair

Over: CK

4N & 6.3W VIBORG, Turner, SD

Built 2002 Load: 19.6 t ADT: 50

LOCUST STREET

Fair

Over: MARNE CREEK

LOCUST STREET - YANKTON, Yankton, SD

Built 1984 Load: 19.6 t ADT: 343

Cliff Avenue

Fair

Over: Big Sioux River

N of Walnut Street - SF, Minnehaha, SD

Built 1994 Load: 19.7 t ADT: 13,370

174TH ST

Fair

Over: TURTLE CREEK

0.7 S 2.6 W REDFIELD, Spink, SD

Built 1965 Load: 19.7 t ADT: 126

193rd Street

Fair

Over: James River

15N & 0.6W of Huron, Beadle, SD

Built 1954 Load: 19.8 t ADT: 56

359TH AVE

Fair

Over: CK

5.1N & 1W MILLER, Hand, SD

Built 1910 Load: 19.8 t ADT: 15

466th Avenue

Fair

Over: Long Creek

2.6N of Jct. US Hwy 18, Lincoln, SD

Built 1951 Load: 19.8 t ADT: 1,017

284th Street

Fair

Over: S Fork of Beaver Creek

2S & 4.6W of Canton, Lincoln, SD

Built 1997 Load: 19.8 t ADT: 75

247 ST

Fair

Over: WEST FIRESTEEL CK

6.3E 6N PLANKINTON, Aurora, SD

Built 1982 Load: 19.9 t ADT: 65

27080 405 AVE.

Fair

Over: SOUTH FORK TWELVE MILE C

5 W & 0.8 S DIMOCK, Hutchinson, SD

Built 1952 Load: 19.9 t ADT: 69

231 AVENUE

Fair

Over: LAKE CK

0.5 S TUTHILL, Bennett, SD

Built 1954 Load: 20.0 t ADT: 120

483 AVENUE

Fair

Over: COBB CK

4.1 N ASTORIA, Deuel, SD

Built 1956 Load: 20.0 t ADT: 157

482 AVENUE

Fair

Over: CK

1.4N ALBEE, Grant, SD

Built 1930 Load: 20.0 t ADT: 336

339 AVENUE

Fair

Over: MEDICINE CK

2E & 3S OF HIGHMORE, Hyde, SD

Built 1969 Load: 20.0 t ADT: 45

EMPIRE PL.

Fair

Over: ELK CK

11E&12.5S STURGIS, Meade, SD

Built 1965 Load: 20.0 t ADT: 15

44240 293rd Street

Fair

Over: Clay Creek

4N & 9.7W of Irene, Yankton, SD

Built 1938 Load: 20.0 t ADT: 55

369TH AVE

Fair

Over: CK

8.5N VAYLAND, Hand, SD

Built 1960 Load: 20.1 t ADT: 43

315 AVENUE

Fair

Over: MUD CK

0.6W & 4.3S WINNER, Tripp, SD

Built 1958 Load: 20.1 t ADT: 375

119th Street

Fair

Over: Crow Creek Ditch

1S & 5.5W of Claremont, Brown, SD

Built 1957 Load: 20.2 t ADT: 125

E. Grindstone Rd.

Fair

Over: NORTH FORK BAD RV

12.1 W 4.6 N PHILIP, Haakon, SD

Built 1960 Load: 20.2 t ADT: 28

SD 248 EF

Fair

Over: CK

0.1 N JCT I90, Lyman, SD

Built 1947 Load: 20.2 t ADT: 2,265

303 AVENUE

Fair

Over: SAND CK

1.5E & 0.3N KEYAPAHA, Tripp, SD

Built 1959 Load: 20.2 t ADT: 71

28860 395th Avenue

Fair

Over: Choteau Creek

8.4N of Wagner, Charles Mix, SD

Built 1963 Load: 20.3 t ADT: 241

313th Avenue

Fair

Over: Creek

2W & 8.8S of Kennebec, Lyman, SD

Built 1963 Load: 20.3 t ADT: 24

153RD STREET

Fair

Over: CREEK

1.8W & 1N CONDE, Spink, SD

Built 1932 Load: 20.3 t ADT: 50

108TH AVE.

Fair

Over: REDWATER RV

1W 6.5N SPEARFISH, Lawrence, SD

Built 2008 Load: 20.4 t ADT: 48

OLD HILL CITY ROAD

Fair

Over: BATTLE CK

.8 WEST OF KEYSTONE, Pennington, SD

Built 1973 Load: 20.4 t ADT: 984

SD010

Fair

Over: JAMES RV

2.7 W OF HOUGHTON, Brown, SD

Built 1948 Load: 20.5 t ADT: 484

196TH AVE

Fair

Over: Trib to Cottonwood Creek

0.5W & 1.8S OF QUINN, Pennington, SD

Built 1957 Load: 20.5 t ADT: 24

41420 310th Street

Fair

Over: Creek

2N & 0.8W of Springfield, Bon Homme, SD

Built 1970 Load: 20.6 t ADT: 60

171ST ST

Fair

Over: CK

6.5W & 1N ZELL, Faulk, SD

Built 1927 Load: 20.6 t ADT: 15

313th Avenue

Fair

Over: Hiddenwood Creek

1W & 2.3N of Java, Walworth, SD

Built 1955 Load: 20.6 t ADT: 33

392 AVE

Fair

Over: WEST FIRESTEEL CK

3.9S 1W STORLA, Aurora, SD

Built 1951 Load: 20.7 t ADT: 65

OLD FT THOMPSON RD

Fair

Over: SOLDIER CREEK

1 Mi. So. of Ft. Thompson, Buffalo, SD

Built 1973 Load: 20.7 t ADT: 50

369TH AVE

Fair

Over: LITTLE TURTLE CK

8N VAYLAND, Hand, SD

Built 1960 Load: 20.7 t ADT: 43

DIAMOND RD.

Fair

Over: ALKALI CK

11E & 2.3S STURGIS, Meade, SD

Built 1978 Load: 20.7 t ADT: 10

I090 WF

Fair

Over: AMERICAN CROW CK

0.9 W OACOMA INTERCH, Lyman, SD

Built 1954 Load: 20.8 t ADT: 2,622

451st Avenue

Fair

Over: East Vermillion Lake

7.1S of Montrose, McCook, SD

Built 1958 Load: 20.8 t ADT: 675

Showing 951-1,000 of 5,905 bridges

Related

All states → | National rankings → | Understanding conditions → | SD bridges explained →
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.