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

27860 459 AVE

Fair

Over: VERMILLION RV

1.6S & 2W CHANCELLOR, Turner, SD

Built 1993 Load: 24.5 t ADT: 97

45930 293RD ST

Fair

Over: TURKEY RIDGE CK

2S & 3.3E VIBORG, Turner, SD

Built 1994 Load: 24.5 t ADT: 25

28440 460TH AVE

Fair

Over: VERMILLION RV

0.6N DAVIS, Turner, SD

Built 1997 Load: 24.5 t ADT: 97

29410 460 AVE

Fair

Over: TURKEY RIDGE CK

2W & 0.9N CENTERVILLE, Turner, SD

Built 1989 Load: 24.5 t ADT: 97

46030 283 ST

Fair

Over: VERMILLION RV

2N & 0.3E DAVIS, Turner, SD

Built 1988 Load: 24.5 t ADT: 97

46030 294TH ST

Fair

Over: TURKEY RIDGE CK

1.7W CENTERVILLE, Turner, SD

Built 1996 Load: 24.5 t ADT: 97

46120 274 ST

Fair

Over: LONG CK

3N & 0.2E CHANCELLOR, Turner, SD

Built 2000 Load: 24.5 t ADT: 50

46270 226 ST

Fair

Over: LONG CK

1N & 1.7E CHANCELLOR, Turner, SD

Built 1998 Load: 24.5 t ADT: 97

27680 463 AVE

Fair

Over: LONG CK

2E & 0.2N CHANCELLOR, Turner, SD

Built 1998 Load: 24.5 t ADT: 97

47160 302 ST

Fair

Over: CK

5S BERESFORD, Union, SD

Built 1960 Load: 24.5 t ADT: 450

47160 310 STR.

Fair

Over: BRULE CK

12S & 0.4E BERESFORD, Union, SD

Built 1970 Load: 24.5 t ADT: 35

47250 300 STR.

Fair

Over: CK

2S & 0.5E BERESFORD, Union, SD

Built 1950 Load: 24.5 t ADT: 35

47280 319TH STR.

Fair

Over: DRAINAGE DITCH

5N & 3.2W ELK POINT, Union, SD

Built 1940 Load: 24.5 t ADT: 50

30490 473 AVE

Fair

Over: BRULE CK

1E & 6.9S BERESFORD, Union, SD

Built 1940 Load: 24.5 t ADT: 75

30590 474TH AVE

Fair

Over: CK

2E & 7.9S BERESFORD, Union, SD

Built 1983 Load: 24.5 t ADT: 40

31490 475TH ST

Fair

Over: BRULE CK

2.5N & 4E JUNCTION CITY, Union, SD

Built 1977 Load: 24.5 t ADT: 60

31150 475TH AVE

Fair

Over: CK

2E & 1.5N SPINK, Union, SD

Built 1939 Load: 24.5 t ADT: 97

47670 301 ST.

Fair

Over: EAST BRULE CK

1.8W ALCESTER, Union, SD

Built 1944 Load: 24.5 t ADT: 50

31900 LAWRENCE RD

Fair

Over: CK

5N & 2E ELK POINT, Union, SD

Built 1977 Load: 24.5 t ADT: 45

47850 299TH ST

Fair

Over: EAST BRULE CK

2N & 0.5W ALCESTER, Union, SD

Built 1930 Load: 24.5 t ADT: 45

47930 311TH ST

Fair

Over: WEST UNION CK

9.5S & 0.3E ALCESTER, Union, SD

Built 1981 Load: 24.5 t ADT: 100

31390 481ST AVE

Fair

Over: DRAINAGE DITCH

10.1N & 5E ELK POINT, Union, SD

Built 1976 Load: 24.5 t ADT: 140

48150 313TH ST.

Fair

Over: DRAINAGE DITCH

11.5S & 2.5E ALCESTER, Union, SD

Built 1950 Load: 24.5 t ADT: 30

30320 482ND AVE

Fair

Over: CK

3E & 2.2S ALCESTER, Union, SD

Built 1983 Load: 24.5 t ADT: 45

48296 307TH ST

Fair

Over: CK

5.5S & 3.9E ALCESTER, Union, SD

Built 1977 Load: 24.5 t ADT: 55

30880 RIVER RD

Fair

Over: CK

3E & 1.7S BIG SPRINGS, Union, SD

Built 1979 Load: 24.5 t ADT: 50

30599 RIVER ROAD

Fair

Over: CK

5S & 5.5E ALCESTER, Union, SD

Built 1989 Load: 24.5 t ADT: 325

30330 RIVER ROAD

Fair

Over: CK

2S & 5.3E ALCESTER, Union, SD

Built 1972 Load: 24.5 t ADT: 325

132nd Street

Fair

Over: Creek

2S & 4.4W of Selby, Walworth, SD

Built 1959 Load: 24.5 t ADT: 129

303rd Avenue

Fair

Over: Reiger Creek

1.5N of Akaska, Walworth, SD

Built 1957 Load: 24.5 t ADT: 112

303rd Avenue

Fair

Over: Swan Creek

0.5S of Akaska, Walworth, SD

Built 1967 Load: 24.5 t ADT: 85

307th Avenue

Fair

Over: Hiddenwood Creek

5.7N of Selby, Walworth, SD

Built 1934 Load: 24.5 t ADT: 52

307th Avenue

Fair

Over: Hiddenwood Creek

5.6N of Selby, Walworth, SD

Built 1934 Load: 24.5 t ADT: 52

140th Street

Fair

Over: Creek

1.7W & 8N of Hoven, Walworth, SD

Built 1969 Load: 24.5 t ADT: 73

42920 304th Street

Fair

Over: Beaver Creek

5.8W of Utica, Yankton, SD

Built 1940 Load: 24.5 t ADT: 125

30330 430th Avenue

Fair

Over: Beaver Creek

5W & 0.7N of Utica, Yankton, SD

Built 1949 Load: 24.5 t ADT: 300

30280 431st Avenue

Fair

Over: Beaver Creek

2.8S & 1E of Lesterville, Yankton, SD

Built 1993 Load: 24.5 t ADT: 45

30150 433rd Avenue

Fair

Over: Beaver Creek

2W & 2.5N of Utica, Yankton, SD

Built 1963 Load: 24.5 t ADT: 65

30190 434th Avenue

Fair

Over: Beaver Creek

2.1N & 1.0W of Utica, Yankton, SD

Built 1988 Load: 24.5 t ADT: 40

30250 436th Avenue

Fair

Over: Beaver Creek

1.5N & 1E of Utica, Yankton, SD

Built 1992 Load: 24.5 t ADT: 33

43960 304th Street

Fair

Over: Beaver Creek

4.5E & 0.1S of Utica, Yankton, SD

Built 1949 Load: 24.5 t ADT: 195

30540 SW Jim River

Fair

Over: Beaver Creek

3.6N & 0.7E of Yankton, Yankton, SD

Built 1970 Load: 24.5 t ADT: 80

29370 443rd Avenue

Fair

Over: Clay Creek

3.2N & 9W of Irene, Yankton, SD

Built 1990 Load: 24.5 t ADT: 45

44370 295th Street

Fair

Over: Clay Creek

2N & 8.3W of Irene, Yankton, SD

Built 1987 Load: 24.5 t ADT: 75

44780 305th Street

Fair

Over: Unnamed Creek

3.2W & 0.8N of Volin, Yankton, SD

Built 1985 Load: 24.5 t ADT: 140

44790 292 St

Fair

Over: Turkey Creek

5 N & 4.1 W Irene, Yankton, SD

Built 1991 Load: 24.5 t ADT: 80

44790 306 ST

Fair

Over: Unnamed Creek

2N&1.9E Mission Hill, Yankton, SD

Built 1989 Load: 24.5 t ADT: 50

29410 449 Ave

Fair

Over: Turkey Creek

2.9 N & 3 W Irene, Yankton, SD

Built 1990 Load: 24.5 t ADT: 33

29690 450 Ave

Fair

Over: Turkey Creek

0.1 N & 2 W Irene, Yankton, SD

Built 1987 Load: 24.5 t ADT: 33

45100 304 ST

Fair

Over: Turkey Creek

2 N Volin, Yankton, SD

Built 1993 Load: 24.5 t ADT: 45

Showing 1,701-1,750 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.