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

229TH STREET

Fair

Over: SAND CK

5.9E & 1 N WOONSOCKET, Sanborn, SD

Built 2000 Load: 99.9 t ADT: 56

410 AVE

Fair

Over: CK

6.5E & 0.3N LETCHER, Sanborn, SD

Built 2003 Load: 99.9 t ADT: 56

SD026

Fair

Over: COTTONWOOD LAKE OUTLET

4.3 NE HAND CO LINE, Spink, SD

Built 1989 Load: 99.9 t ADT: 578

SD028

Fair

Over: CK

1.8 W JCT SD 37, Spink, SD

Built 2013 Load: 99.9 t ADT: 334

FAS 6280

Fair

Over: SANSARC CK

11 N 3.2 E OF HAYES, Stanley, SD

Built 1975 Load: 99.9 t ADT: 50

SD1806

Fair

Over: CHANTIER CK

25 NW JCT US 14 & SD 34, Stanley, SD

Built 1970 Load: 99.9 t ADT: 204

IRR SD1806

Fair

Over: LA ROCHE CK

24.7 SE JCT US 83, Stanley, SD

Built 2007 Load: 99.9 t ADT: 199

IRR US018

Fair

Over: TRIB TO OAK CK

9.4 W TRIPP CO LINE, Todd, SD

Built 2005 Load: 99.9 t ADT: 1,279

28570 453 AVE

Fair

Over: CK

9.7S PARKER, Turner, SD

Built 2006 Load: 99.9 t ADT: 25

459 AVE

Fair

Over: CK

1.0W & 0.6S DAVIS, Turner, SD

Built 2005 Load: 99.9 t ADT: 97

IRR SD065

Fair

Over: CK

2.1 N JCT US 212, Ziebach, SD

Built 1995 Load: 99.9 t ADT: 588

FDR 345

Good

Over: IRON CREEK

T 2 S R 6 E SEC 31, Custer, SD

Built 1991 ADT: 25

265th Street

Good

Over: Creek

1N & 0.5W of Iona, Lyman, SD

Built 2003 Load: 2.6 t ADT: 10

AUTO TOUR ROAD

Good

Over: LAKE CREEK

DIKE 8-SCT 16-S OF OFFICE, Bennett, SD

Built 1936 Load: 5.4 t ADT: 15

CALUMENT

Good

Over: SPRING CREEK

T 1 S R 5 E SEC 14, Pennington, SD

Built 1988 Load: 12.6 t ADT: 50

HAZELRODT CG+SH

Good

Over: FRENCH CREEK

T 4 S R 5 E SEC 10, Custer, SD

Built 1954 Load: 14.9 t ADT: 25

193rd Street

Good

Over: Shue Creek

15N & 5.3W of Iroquois, Beadle, SD

Built 2007 Load: 15.6 t ADT: 56

FAS 3214

Good

Over: BAD RV

9.3 SW JCT US 83, Stanley, SD

Built 1990 Load: 15.6 t ADT: 210

QUINN ROAD

Good

Over: COTTONWOOD CK

0.1W 2.8N QUINN, Pennington, SD

Built 1991 Load: 16.8 t ADT: 153

47860 307TH ST

Good

Over: WEST UNION CK

6S & 0.4W ALCESTER, Union, SD

Built 1950 Load: 17.6 t ADT: 500

RED STONE ROAD

Good

Over: PASS CK

9.6E & 11.4N WANBLEE, Jackson, SD

Built 1995 Load: 18.1 t ADT: 27

IRR BIA RTE 8

Good

Over: WOUNDED KNEE CREEK

1.3KM W OF BIA ROUTE 33, Oglala Lakota, SD

Built 2007 Load: 18.1 t ADT: 74

SD010

Good

Over: TRIB TO FOOT CK

1.9 W OF SD45 JCT, McPherson, SD

Built 2014 Load: 18.5 t ADT: 746

DUREN

Good

Over: BOXELDER

T 2 N R 5 E SEC 12, Meade, SD

Built 1973 Load: 18.5 t ADT: 25

161ST AVENUE

Good

Over: TRIB TO BOXELDER CK

0.8 MI.S. NEWUNDERWD, Pennington, SD

Built 1973 Load: 18.7 t ADT: 372

4th Avenue

Good

Over: Drainage Channel

N of Benson Road - SF, Minnehaha, SD

Built 2000 Load: 19.0 t ADT: 4,400

385 AVE

Good

Over: WEST FIRESTEEL CK

9.2N 1W PLANKINTON, Aurora, SD

Built 1973 Load: 19.1 t ADT: 33

247 ST

Good

Over: CK

2.2 W & 4.0 S OF STORLA, Aurora, SD

Built 1984 Load: 19.1 t ADT: 30

40550 313th Street

Good

Over: Coffee Creek

8.6W & 1S of Springfield, Bon Homme, SD

Built 1987 Load: 19.1 t ADT: 60

40740 298th Street

Good

Over: Trib. to Dry Choteau Ck

4N & 0.4E of Avon, Bon Homme, SD

Built 1984 Load: 19.1 t ADT: 60

30490 411th Avenue

Good

Over: Trib. to Emanuel Creek

4E & 0.9S of Avon, Bon Homme, SD

Built 1983 Load: 19.1 t ADT: 60

41140 306th Street

Good

Over: Little Emanual Creek

2S & 4.6W of Tyndall, Bon Homme, SD

Built 1991 Load: 19.1 t ADT: 64

41350 304th Street

Good

Over: Emanuel Creek

2.3W of Tyndall, Bon Homme, SD

Built 1990 Load: 19.1 t ADT: 60

29490 422nd Avenue

Good

Over: Trib. to Dawson Creek

1.9S & 2.0W of Scotland, Bon Homme, SD

Built 1991 Load: 19.1 t ADT: 60

27680 364th Avenue

Good

Over: Platte Creek

0.8S & 3.0W of Platte, Charles Mix, SD

Built 2005 Load: 19.1 t ADT: 48

36650 273rd Street

Good

Over: Platte Creek

3.1N & 0.5W of Platte, Charles Mix, SD

Built 1990 Load: 19.1 t ADT: 48

39420 292nd Street

Good

Over: Drainage

5.0N & 0.8W of Wagner, Charles Mix, SD

Built 1989 Load: 19.1 t ADT: 40

SOUTH BURR STREET

Good

Over: DRY RUN CK

BURR ST - MITCHELL, Davison, SD

Built 1990 Load: 19.1 t ADT: 11,950

39470 271 ST

Good

Over: CHOTEAU CK

2.0N & 5.7E OF CORSICA, Douglas, SD

Built 1990 Load: 19.1 t ADT: 25

27690 396 AVE

Good

Over: CK

1 E & 3 S CORSICA LAKE, Douglas, SD

Built 1988 Load: 19.1 t ADT: 100

39610 281 ST

Good

Over: CHOTEAU CK

0.5S & 4.1E OF ARMOUR, Douglas, SD

Built 1977 Load: 19.1 t ADT: 77

39810 284 ST

Good

Over: CK

2.9 W. OF DELMONT, Douglas, SD

Built 2009 Load: 19.1 t ADT: 330

39060 280 ST

Good

Over: CK

7.6 E. OF ARMOUR, Douglas, SD

Built 1976 Load: 19.1 t ADT: 206

40240 271 ST

Good

Over: CK

13N & 0.5E DELMONT, Douglas, SD

Built 1983 Load: 19.1 t ADT: 10

27120 403 AVE

Good

Over: CK

8.8N,11.0E OF ARMOUR, Douglas, SD

Built 1990 Load: 19.1 t ADT: 20

Cronk Road

Good

Over: MEDICINE CK

9 E & 1.2 N PHILIP, Haakon, SD

Built 1985 Load: 19.1 t ADT: 13

41740 255 STREET

Good

Over: JOHNSON CK

3.0S 1.6W FULTON, Hanson, SD

Built 1984 Load: 19.1 t ADT: 60

25420 419 AVENUE

Good

Over: CK

2.2 SOUTH OF FULTON, Hanson, SD

Built 1989 Load: 19.1 t ADT: 50

27760 408 AVE.

Good

Over: NORTH BR DRY CK

2 W & 1.6 S PARKSTON, Hutchinson, SD

Built 2001 Load: 19.1 t ADT: 98

40950 268 ST.

Good

Over: CK

7 N 0.5 W PARKSTON, Hutchinson, SD

Built 1987 Load: 19.1 t ADT: 69

Showing 3,051-3,100 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.