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

28650 447TH AVE

Good

Over: CK

12.5S MARION, Turner, SD

Built 1998 Load: 24.5 t ADT: 50

28480 448 AVE

Good

Over: CK

1E & 10.8S MARION, Turner, SD

Built 2002 Load: 24.5 t ADT: 30

27570 452 AVE

Good

Over: WEST FORK VERMILLION RV

0.7 S & 1 W OF PARKER, Turner, SD

Built 1994 Load: 24.5 t ADT: 50

45270 290 ST.

Good

Over: CK

1N & 3.3W VIBORG, Turner, SD

Built 1994 Load: 24.5 t ADT: 97

454 AVE

Good

Over: CK

2.8N & 2.0W HURLEY, Turner, SD

Built 2004 Load: 24.5 t ADT: 650

48670 455 AVE

Good

Over: CK

4.3N & 1.3W VIBORG, Turner, SD

Built 2015 Load: 24.5 t ADT: 50

27360 456 AVE

Good

Over: EAST FORK VERMILLION RV

1.4N & 3E PARKER, Turner, SD

Built 2007 Load: 24.5 t ADT: 45

45780 276 ST

Good

Over: ELCE CK

1S & 4.8E PARKER, Turner, SD

Built 1997 Load: 24.5 t ADT: 25

29690 458TH AVE

Good

Over: CK

2E & 5.9S VIBORG, Turner, SD

Built 2002 Load: 24.5 t ADT: 97

45880 292ND ST

Good

Over: TURKEY RIDGE CK

1S & 2.8E VIBORG, Turner, SD

Built 1995 Load: 24.5 t ADT: 40

45970 294TH ST

Good

Over: TURKEY RIDGE CK

2.3W CENTERVILLE, Turner, SD

Built 1993 Load: 24.5 t ADT: 97

28610 460 AVE

Good

Over: VERMILLION RV

1.1S & 0.2W DAVIS, Turner, SD

Built 2008 Load: 24.5 t ADT: 97

46330 289 ST

Good

Over: VERMILLION RV

4S & 2.1E DAVIS, Turner, SD

Built 1991 Load: 24.5 t ADT: 5

31260 475TH AVE

Good

Over: CK

2MI E. & 0.5 N. OF SPINK, Union, SD

Built 2000 Load: 24.5 t ADT: 97

30940 476TH AVE

Good

Over: CK

4E & 11.4S BERESFORD, Union, SD

Built 2016 Load: 24.5 t ADT: 35

31590 476 TH AVE

Good

Over: BRULE CK

8.1N ELK POINT, Union, SD

Built 2004 Load: 24.5 t ADT: 35

32050 478TH AVE

Good

Over: BRULE CK

1.4S RICHLAND, Union, SD

Built 1983 Load: 24.5 t ADT: 50

139th Street

Good

Over: Pero Creek

3N & 2.5W of Akaska, Walworth, SD

Built 1956 Load: 24.5 t ADT: 166

304th Avenue

Good

Over: Creek

3W & 0.3S of Selby, Walworth, SD

Built 1999 Load: 24.5 t ADT: 33

138th Street

Good

Over: Swan Lake Creek

10N & 1.7E of Hoven, Walworth, SD

Built 1994 Load: 24.5 t ADT: 15

W 21ST STREET

Good

Over: MARNE CREEK

W 21ST STREET - YANKTON, Yankton, SD

Built 1973 Load: 24.5 t ADT: 6,324

30650 448 Ave.

Good

Over: Drainage Ditch

2 E 1.5 N Mission Hill, Yankton, SD

Built 2016 Load: 24.5 t ADT: 173

44930 305 ST

Good

Over: Clay Creek Ditch

1.7 W 0.8 N Volin, Yankton, SD

Built 2016 Load: 24.5 t ADT: 345

45060 300TH St

Good

Over: Turkey Creek

3 S & 1.4 W Irene, Yankton, SD

Built 2000 Load: 24.5 t ADT: 50

30010 451 Ave

Good

Over: Turkey Creek

3.1S,1.1W of Irene, Yankton, SD

Built 1991 Load: 24.5 t ADT: 33

FOUR CORNER ROAD

Good

Over: LUIS CK

4.0W BRIDGER, Ziebach, SD

Built 2005 Load: 24.5 t ADT: 14

28410 402 AVE

Good

Over: CK

0.1S OF DELMONT, Douglas, SD

Built 1982 Load: 24.6 t ADT: 77

477th Avenue

Good

Over: Big Sioux River

0.5N of Trent, Moody, SD

Built 1991 Load: 24.7 t ADT: 50

SD044

Good

Over: CK

5.3 E JCT SD 47, Gregory, SD

Built 1964 Load: 24.9 t ADT: 530

Ash Creek Road

Good

Over: UPPER DEEP CK

10.6W 2.9S MILESVILLE, Haakon, SD

Built 2015 Load: 24.9 t ADT: 37

Ash Creek Road

Good

Over: UPPER DEEP CREEK

10.6 W & 3.1 S MILESVILLE, Haakon, SD

Built 2015 Load: 24.9 t ADT: 7

216 STREET

Good

Over: CK

5 E STEPHAN, Hyde, SD

Built 2015 Load: 24.9 t ADT: 95

MCKINLEY STREET

Good

Over: WHITEWOOD CK

MCKINLEY ST - DEADWOOD, Lawrence, SD

Built 1990 Load: 24.9 t ADT: 698

Private Driveway

Good

Over: Drainage Channel

E1/2 LOT8 BL10 N BENSN-SF, Minnehaha, SD

Built 2000 Load: 24.9 t ADT: 20

WINTER STREET.

Good

Over: CK

ENTRANCE TO BORGLUM CENT., Pennington, SD

Built 2008 Load: 24.9 t ADT: 3,200

NEMO ROAD

Good

Over: ESTES CK

1.6 S 0.6 E NEMO, Lawrence, SD

Built 1975 Load: 25.0 t ADT: 500

I090 W

Good

Over: BEAR BUTTE CK

0.4 W US 14A INTERCH, Meade, SD

Built 1963 Load: 25.0 t ADT: 7,485

COUNTY RD

Good

Over: TURKEY RIDGE CK

6W & 5.8N VIBORG, Turner, SD

Built 2021 Load: 25.0 t ADT: 50

SD034

Good

Over: CK

0.4 W JERAULD CO LINE, Buffalo, SD

Built 1952 Load: 25.1 t ADT: 513

SD045

Good

Over: N WOLF CK

4.5 MI S OF FAULK CO LINE, Hand, SD

Built 2002 Load: 25.1 t ADT: 575

US018

Good

Over: CK

2.0 E JCT SD 37, Hutchinson, SD

Built 1940 Load: 25.1 t ADT: 723

SD034

Good

Over: CK

5.4 E BUFFALO CO LINE, Jerauld, SD

Built 1952 Load: 25.1 t ADT: 513

SD044

Good

Over: CK

0.4 E JCT SD 17, Lincoln, SD

Built 1953 Load: 25.1 t ADT: 2,218

SD044

Good

Over: CK

1.5 E JCT SD 17, Lincoln, SD

Built 1953 Load: 25.1 t ADT: 2,218

Split Creek Ct

Good

Over: Trib. to Spring Creek

2.9N & 3.0E of Harrisburg, Lincoln, SD

Built 2014 Load: 25.1 t ADT: 80

SD262

Good

Over: EAST BR WOLF CK

1.8 SE HANSON CO LINE, McCook, SD

Built 1936 Load: 25.1 t ADT: 808

SD262

Good

Over: BR WOLF CK

2.2 NW JCT SD 42, McCook, SD

Built 1936 Load: 25.1 t ADT: 808

MARSHALL STREET

Good

Over: DEADMAN GULCH

MARSHALL ST - STURGIS, Meade, SD

Built 1979 Load: 25.1 t ADT: 50

SD034

Good

Over: CK

13.7 NE JCT SD 79 N, Meade, SD

Built 1956 Load: 25.1 t ADT: 818

IRR AR SD063

Good

Over: CHURCH CK

4.8 N JCT 44 E, Mellette, SD

Built 2003 Load: 25.1 t ADT: 159

Showing 3,501-3,550 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.