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

44760 302nd Street

Fair

Over: Unnamed Creek

5S & 4.4W of Irene, Yankton, SD

Built 1940 Load: 13.5 t ADT: 50

192ND St

Fair

Over: Shue Creek

16N 6.1W Iroquois, Beadle, SD

Built 1936 Load: 13.6 t ADT: 60

STATE PARK RD

Fair

Over: FRENCH CK

12.9E 3.9S CUSTER, Custer, SD

Built 1950 Load: 13.6 t ADT: 5

486 AVENUE

Fair

Over: MONIGHAN CK

1W & 1.5N GARY, Deuel, SD

Built 1954 Load: 13.6 t ADT: 143

156 STREET

Fair

Over: CK

2.6E & 7S MILBANK, Grant, SD

Built 1935 Load: 13.6 t ADT: 40

462 AVE

Fair

Over: BUFFALO CK

2W & 0.2S CHESTER, Lake, SD

Built 1940 Load: 13.6 t ADT: 50

204TH STREET

Fair

Over: CK

0.5S & 6.9E WHITE, Brookings, SD

Built 1930 Load: 13.7 t ADT: 92

413TH AVE.

Fair

Over: REDSTONE CK

1 W 2.4 N ARTESIAN, Sanborn, SD

Built 1930 Load: 13.7 t ADT: 175

MARTY RD

Fair

Over: NORTH FORK MOREAU RV

19.6E 1.0S OF REDIG, Harding, SD

Built 1986 Load: 13.8 t ADT: 31

COUNTY RD

Fair

Over: ANTELOPE CK

10.3M S 2.25E FT.PIR, Stanley, SD

Built 1935 Load: 13.9 t ADT: 130

STONE LAKE ROAD

Fair

Over: OWL CK

2.1E & 0.7N NISLAND, Butte, SD

Built 1964 Load: 14.0 t ADT: 47

SD ROUTE 87

Fair

Over: BEAVER CREEK

ON SD ROUTE 87, MP 41.4;, Custer, SD

Built 1929 Load: 14.0 t ADT: 326

40520Avon Road

Fair

Over: Trib. to Dry Choteau Crk

0.8W of Avon, Bon Homme, SD

Built 1950 Load: 14.2 t ADT: 60

ROBINS ROOST ROAD

Fair

Over: SPRING CK

2E & 0.8N HILL CITY, Pennington, SD

Built 1964 Load: 14.2 t ADT: 65

396TH AVE

Fair

Over: James River

3.7 S FRANKFORT, Spink, SD

Built 1954 Load: 14.2 t ADT: 73

42230 310th Street

Fair

Over: Creek

3S & 4.7W of Tabor, Bon Homme, SD

Built 1930 Load: 14.3 t ADT: 60

N. Main Streek

Fair

Over: Medicine Creek

0.8N of Presho, Lyman, SD

Built 1958 Load: 14.3 t ADT: 570

VISTA PL.

Fair

Over: CK

10 S 3.25 W PLAINVIEW, Meade, SD

Built 1930 Load: 14.3 t ADT: 9

148th Street

Fair

Over: Snake Creek

7 W of Mansfield, Brown, SD

Built 1956 Load: 14.5 t ADT: 420

480 AVENUE

Fair

Over: NORTH FORK YELLOW BANK R

3.5S & 2E MILBANK, Grant, SD

Built 1966 Load: 14.5 t ADT: 35

296th Street

Fair

Over: Trib. to W Brule Creek

1N & 4.2E of Beresford, Lincoln, SD

Built 1940 Load: 14.5 t ADT: 45

468th Avenue

Fair

Over: Tributary to Blind Creek

3W & 1.7N of Beresford, Lincoln, SD

Built 1930 Load: 14.6 t ADT: 48

477th Avenue

Fair

Over: Saddle Creek

3W & 8.2S of Canton, Lincoln, SD

Built 1935 Load: 14.6 t ADT: 65

483rd Avenue

Fair

Over: Trib. to Finnie Creek

4.5W & 1.4S of Hudson, Lincoln, SD

Built 1935 Load: 14.6 t ADT: 45

LITTLE ELK CK. RD.

Fair

Over: LITTLE ELK CK

11.7S&4.9E STURGIS, Meade, SD

Built 1955 Load: 14.6 t ADT: 11

485th Avenue

Fair

Over: Flandreau Creek

4E & 0.2N of Flandreau, Moody, SD

Built 1958 Load: 14.6 t ADT: 45

LEWIS ROAD

Fair

Over: DEER CK

3 N 5.8 E VALE, Butte, SD

Built 1996 Load: 14.7 t ADT: 26

44140 303rd Street

Fair

Over: James River

6.4E & 1N of Utica, Yankton, SD

Built 1962 Load: 14.7 t ADT: 244

BROOKER RD

Fair

Over: INDIAN CK

14N 5.2E B. FOURCHE, Butte, SD

Built 1950 Load: 14.8 t ADT: 47

167TH ST

Fair

Over: CK

3.3W MIRANDA, Faulk, SD

Built 1930 Load: 14.8 t ADT: 77

43410 Stone Church

Fair

Over: Trib. to James River

10.8N & 0.8W of Utica, Yankton, SD

Built 1935 Load: 14.8 t ADT: 100

237 STREET

Fair

Over: UNNAMED CK

7.7E COTTONWOOD, Jackson, SD

Built 1934 Load: 14.9 t ADT: 11

SHERIDAN LAKE ROAD

Fair

Over: SPRING CK

1.8N3.6W ROCKERVILLE, Pennington, SD

Built 1974 Load: 14.9 t ADT: 933

OLD HWY 85

Fair

Over: INDIAN CK

15.5N 2.5E B.FOURCHE, Butte, SD

Built 1932 Load: 15.0 t ADT: 36

TWNSHP RD 485TH AV

Fair

Over: CROW TIMBER CK

9E & 2.2N TUNERVILLE, Deuel, SD

Built 1940 Load: 15.0 t ADT: 20

29590 436th Avenue

Fair

Over: James River

8.1N & 0.5E of Utica, Yankton, SD

Built 1957 Load: 15.0 t ADT: 78

393 AVE

Fair

Over: CK

4.8S 7E PLANKINTON, Aurora, SD

Built 1940 Load: 15.1 t ADT: 24

414th Avenue

Fair

Over: Creek

5W & 2.9N Pierpont, Day, SD

Built 1930 Load: 15.1 t ADT: 15

27510 411 AVE.

Fair

Over: PONY CK

NE EDGE PARKSTON, Hutchinson, SD

Built 1930 Load: 15.1 t ADT: 75

187TH ST

Fair

Over: James River

5.6E 3.0N HITCHCOCK, Spink, SD

Built 1959 Load: 15.1 t ADT: 21

398TH AVE

Fair

Over: TIMBER CREEK

3.9S & 2E FRANKFORT, Spink, SD

Built 1957 Load: 15.1 t ADT: 55

243 ST

Fair

Over: FIRESTEEL CK

2.5W STORLA, Aurora, SD

Built 1930 Load: 15.2 t ADT: 33

ELM STREET

Fair

Over: PONY CK

ELM STREET PARKSTON, Hutchinson, SD

Built 1955 Load: 15.2 t ADT: 155

OPAL RD.

Fair

Over: HORSE CK

9S & 1.5 W MAURINE, Meade, SD

Built 1995 Load: 15.2 t ADT: 60

Farm Driveway

Fair

Over: Spring Creek

1.6 N & 7. 5E OF Herried, Campbell, SD

Built 1935 Load: 15.3 t ADT: 10

291st Avenue

Fair

Over: Creek

13W & 19.8N of Presho, Lyman, SD

Built 1930 Load: 15.3 t ADT: 24

175 STREET

Fair

Over: BIG SIOUX RV

3.0S & 2.8E WATERTOWN, Codington, SD

Built 1986 Load: 15.4 t ADT: 41

235 ST

Fair

Over: PARK CK

2.0S & 1.3E MADISON, Lake, SD

Built 1937 Load: 15.4 t ADT: 684

349 AVENUE

Fair

Over: PONCA CK

1W & 3.7S HERRICK, Gregory, SD

Built 1949 Load: 15.5 t ADT: 120

367 AVENUE

Fair

Over: SMITH CK

0.5S & 5.5W CROW LAKE, Jerauld, SD

Built 1974 Load: 15.5 t ADT: 42

Showing 551-600 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.