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

30870 454 AVE

Fair

Over: CLAY CK DITCH

1.0W & 6.7S WAKONDA, Clay, SD

Built 1975 Load: 24.5 t ADT: 5

30950 461 AVE

Fair

Over: CK

12.5S 9.0E IRENE SD, Clay, SD

Built 1930 Load: 24.5 t ADT: 25

46530 MARSHALTOWN

Fair

Over: BAPTIST CK

10.5S & 13.3E IRENE, Clay, SD

Built 1995 Load: 24.5 t ADT: 206

46660 303 ST.

Fair

Over: BAPTIST CK

6S & 14.6E IRENE, Clay, SD

Built 1995 Load: 24.5 t ADT: 25

W Kemp Avenue

Fair

Over: Big Sioux River

0.3E of 10th Street NW, Codington, SD

Built 1935 Load: 24.5 t ADT: 5,053

455 AVENUE

Fair

Over: CK

8.1 N OF WATERTOWN, Codington, SD

Built 1979 Load: 24.5 t ADT: 1,167

455 AVENUE

Fair

Over: CK

7 N JCT US 212, Codington, SD

Built 1982 Load: 24.5 t ADT: 1,425

155 STREET

Fair

Over: CK

2.0N 7.2W SOUTHSHORE, Codington, SD

Built 1941 Load: 24.5 t ADT: 73

459 AVENUE

Fair

Over: CK

4.0E 5.5N WATERTOWN, Codington, SD

Built 1954 Load: 24.5 t ADT: 16

174 STREET

Fair

Over: STRAY HORSE CK

2.0S 0.2E KRANZBURG, Codington, SD

Built 1988 Load: 24.5 t ADT: 25

220TH AVENUE

Fair

Over: HAY CREEK

0.1S MORRISTOWN, Corson, SD

Built 1977 Load: 24.5 t ADT: 100

230th Avenue

Fair

Over: Dirt Lodge Creek

1.2E & 11.6S WATAUGA, Corson, SD

Built 1988 Load: 24.5 t ADT: 30

COUNTY ROAD

Fair

Over: HUMP CREEK

3.7W & 6.1S MCINTOSH, Corson, SD

Built 1974 Load: 24.5 t ADT: 30

SD087

Fair

Over: FRENCH CK

4.9 S JCT US 16A, Custer, SD

Built 1937 Load: 24.5 t ADT: 940

STATE PARK ROAD

Fair

Over: CK

10 miles east of Custer, Custer, SD

Built 1940 Load: 24.5 t ADT: 50

E FRENCH CK ROAD

Fair

Over: FRENCH CK

10.0E 2.0S FAIRBURN, Custer, SD

Built 1967 Load: 24.5 t ADT: 18

SPRING CK CUTOFF

Fair

Over: SPRING CK

12E HERMOSA, Custer, SD

Built 1986 Load: 24.5 t ADT: 50

SD ROUTE 87

Fair

Over: WASH

ON SD ROUTE 87, MP 46.3;, Custer, SD

Built 1956 Load: 24.5 t ADT: 326

S. MINNESOTA ST.

Fair

Over: DRY RUN CK

MINNESOTA ST - MITCHELL, Davison, SD

Built 1976 Load: 24.5 t ADT: 3,667

250TH STREET

Fair

Over: JAMES RV

4 N & 1.9 E MITCHELL, Davison, SD

Built 1961 Load: 24.5 t ADT: 460

412TH Avenue

Fair

Over: Creek

4 W & 3.7 N of Andover, Day, SD

Built 1985 Load: 24.5 t ADT: 69

412TH Avenue

Fair

Over: Creek

4 W & 1.2 N of Andover, Day, SD

Built 1934 Load: 24.5 t ADT: 69

412TH Avenue

Fair

Over: Mud Creek

4 W & 4.7 S of Andover, Day, SD

Built 1930 Load: 24.5 t ADT: 69

130th Street

Fair

Over: Creek

.5N & 3.9W of Pierpont, Day, SD

Built 1930 Load: 24.5 t ADT: 27

130th Street

Fair

Over: Creek

0.5N & 2.9E of Pierpont, Day, SD

Built 1935 Load: 24.5 t ADT: 385

128th Street

Fair

Over: Creek

2 N & 11.5 E of Roslyn, Day, SD

Built 1993 Load: 24.5 t ADT: 307

472 AVENUE

Fair

Over: PEG MUNKY RUN CK

6W & 0.9N TORONTO, Deuel, SD

Built 1940 Load: 24.5 t ADT: 25

486 AVENUE

Fair

Over: CK

6S & 4.5E REVILLO, Deuel, SD

Built 1953 Load: 24.5 t ADT: 425

IRR BIA RTE 7

Fair

Over: BEAVER CREEK

7.2 KM EAST OF PROMISE, Dewey, SD

Built 1960 Load: 24.5 t ADT: 100

38030 273 ST

Fair

Over: CK

8.7 W CORSICA, Douglas, SD

Built 1923 Load: 24.5 t ADT: 265

38820 273 ST

Fair

Over: ANDES CK

0.8 W CORSICA, Douglas, SD

Built 1950 Load: 24.5 t ADT: 526

38830 279 ST

Fair

Over: ANDES CK

1.5N,3.7W OF ARMOUR, Douglas, SD

Built 1940 Load: 24.5 t ADT: 10

146th Street

Fair

Over: Preacher's Run Creek

12.0S & 9.5E of Ipswich, Edmunds, SD

Built 2004 Load: 24.5 t ADT: 60

OLD HWY 18

Fair

Over: CK

3S JCT SD 89, Fall River, SD

Built 1933 Load: 24.5 t ADT: 1,120

KNAPPIE ROAD

Fair

Over: ANGOSTURA MAIN CANAL

5.3S & 2.8E HOT SPRINGS, Fall River, SD

Built 1950 Load: 24.5 t ADT: 15

HORSE CAMP ROAD

Fair

Over: ANGOSTURA MAIN CANAL

6.7W & 3.3S OF ORAL, Fall River, SD

Built 1986 Load: 24.5 t ADT: 41

FAIRVIEW ROAD

Fair

Over: ANGOSTURA MAIN CANAL

2.7W & 1.9S ORAL, Fall River, SD

Built 1981 Load: 24.5 t ADT: 25

SHADY ROAD

Fair

Over: IRRIGATION DITCH

1.9S & 0.7W OF ORAL, Fall River, SD

Built 1987 Load: 24.5 t ADT: 20

146 STREET

Fair

Over: CK

14.6W & 0.5N MARVIN, Grant, SD

Built 1948 Load: 24.5 t ADT: 95

146 STREET

Fair

Over: CK

10.2W & 0.5N MARVIN, Grant, SD

Built 1931 Load: 24.5 t ADT: 52

455 AVENUE

Fair

Over: CK

3.6N CODINGTON LINE, Grant, SD

Built 1939 Load: 24.5 t ADT: 238

455 AVENUE

Fair

Over: CK

3.1N CODINGTON LINE, Grant, SD

Built 1940 Load: 24.5 t ADT: 250

458 AVENUE

Fair

Over: CK

6.7W & 2.6S MARVIN, Grant, SD

Built 1936 Load: 24.5 t ADT: 35

143 STREET

Fair

Over: CK

1.2E & 3.5N MARVIN, Grant, SD

Built 1941 Load: 24.5 t ADT: 130

152 STREET

Fair

Over: CK

4.8E & 5.5S MARVIN, Grant, SD

Built 1930 Load: 24.5 t ADT: 52

147 STREET

Fair

Over: CK

6.9W & 2N MILBANK, Grant, SD

Built 1926 Load: 24.5 t ADT: 100

472 AVENUE

Fair

Over: SOUTH FORK WHETSTONE RV

1E & 1.2N TWIN BROOKS, Grant, SD

Built 1973 Load: 24.5 t ADT: 341

472 AVENUE

Fair

Over: YELLOW BR CK

3.5S US 12, Grant, SD

Built 1950 Load: 24.5 t ADT: 445

475 AVENUE

Fair

Over: NORTH FORK YELLOW BANK R

4S & 3W MILBANK, Grant, SD

Built 1938 Load: 24.5 t ADT: 100

475 AVENUE

Fair

Over: CK

3W & 5.4S MILBANK, Grant, SD

Built 1938 Load: 24.5 t ADT: 100

Showing 1,301-1,350 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.