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

SD011 SF

Good

Over: EAST BRULE CK

1.0 S JCT SD 46, Union, SD

Built 1984 Load: 46.5 t ADT: 96

IRR SD044

Good

Over: WHITE RV

2.2 E 1.7 S OF INTERIOR, Jackson, SD

Built 1996 Load: 46.7 t ADT: 571

FDR 181

Good

Over: CASTLE CREEK

T 1 N R 3 E SEC 1, Meade, SD

Built 1957 Load: 46.7 t ADT: 25

WESTERN AVE.

Good

Over: SIX MILE CK

WESTERN AVE - BROOKINGS, Brookings, SD

Built 1988 Load: 46.9 t ADT: 1,356

30370 461 AVE

Good

Over: VERMILLION RV

6.7S & 9E IRENE, Clay, SD

Built 2001 Load: 46.9 t ADT: 50

240 ST

Good

Over: ROCK CK

7.0S & 6.6W HOWARD, Miner, SD

Built 2005 Load: 46.9 t ADT: 18

SD130

Good

Over: BURLINGTON NORTHERN RR

3.6 E OF SELBY, Walworth, SD

Built 2006 Load: 46.9 t ADT: 310

30880 UNIVER. ROAD

Good

Over: BAPTIST CK

2.8S HUB CITY, Clay, SD

Built 1995 Load: 47.0 t ADT: 220

FDR 345

Good

Over: IRON CREEK

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

Built 1958 Load: 47.0 t ADT: 25

US385

Good

Over: FALL RV

0.5 N JCT US 18W, Fall River, SD

Built 1998 Load: 47.0 t ADT: 5,377

SD050

Good

Over: AMERICAN CK

0.5 N JCT I 90 LOOP, Brule, SD

Built 1999 Load: 47.1 t ADT: 3,199

413TH AVE

Good

Over: CK

1.6W 7.4N ARTESIAN, Sanborn, SD

Built 2022 Load: 47.1 t ADT: 147

122nd Street

Good

Over: Elm River

2S & 1.5E of Westport, Brown, SD

Built 2010 Load: 47.2 t ADT: 98

SD050

Good

Over: CK

12.7 N JCT SD 44, Charles Mix, SD

Built 1984 Load: 47.2 t ADT: 156

SD037

Good

Over: SOUTH FORK TWELVE MILE C

0.5 S DAVISON CO LINE, Hutchinson, SD

Built 2000 Load: 47.2 t ADT: 3,365

SD073

Good

Over: RED SCAFFOLD CK

5.9 S OF FAITH, Meade, SD

Built 1987 Load: 47.2 t ADT: 882

SD053

Good

Over: BUTTE CK

0.6 N JCT SD 44, Mellette, SD

Built 1989 Load: 47.2 t ADT: 106

SD037

Good

Over: UNNAMED CK

6.6N SPRINGFIELD, Bon Homme, SD

Built 2019 Load: 47.3 t ADT: 1,604

US212

Good

Over: TIMBER CK

0.1 W JCT SD 37 S, Spink, SD

Built 2007 Load: 47.3 t ADT: 1,170

29260 423rd Avenue

Good

Over: Dawson Creek

1W of Scotland, Bon Homme, SD

Built 2022 Load: 47.4 t ADT: 630

239th Street

Good

Over: Medicine Creek

0.5E & 0.5N of Vivian, Lyman, SD

Built 1986 Load: 47.4 t ADT: 20

NINTH STREET

Good

Over: BEAR BUTTE CK

9TH ST - STURGIS, Meade, SD

Built 2019 Load: 47.4 t ADT: 488

127th Street

Good

Over: Jorgenson River

0.8E of Peever, Roberts, SD

Built 1991 Load: 47.5 t ADT: 285

30650 472 AVE.

Good

Over: BRULE CK

8.5S BERESFORD, Union, SD

Built 1989 Load: 47.5 t ADT: 30

476TH AVENUE

Good

Over: TRIBUTARY TO MEDARY CK

2.1S AURORA, Brookings, SD

Built 2003 Load: 47.6 t ADT: 250

276th Street

Good

Over: Beaver Creek

3N & 2.1E of Lennox, Lincoln, SD

Built 2008 Load: 47.6 t ADT: 770

FDR 224

Good

Over: LITTLE CREEK

T 3 N R 5 E SEC 11, Meade, SD

Built 2002 Load: 47.6 t ADT: 25

SD044

Good

Over: BEAR CK

1.7 E OF SCENIC, Pennington, SD

Built 1976 Load: 47.6 t ADT: 486

410th Avenue

Good

Over: Creek

5.3N & 6.4E of Groton, Brown, SD

Built 2001 Load: 47.7 t ADT: 825

IRR SD044

Good

Over: CK

5.7 E JCT SD 73, Jackson, SD

Built 1980 Load: 47.7 t ADT: 455

US385 NF

Good

Over: SPRING CK

1.3 NE JCT US 16 E, Pennington, SD

Built 1996 Load: 47.7 t ADT: 5

US083

Good

Over: ARTICHOKE CK

1.6 N SULLY CO LINE, Potter, SD

Built 1989 Load: 47.7 t ADT: 1,452

215TH STREET

Good

Over: DEER CREEK

3.2E & 3S BROOKINGS, Brookings, SD

Built 2008 Load: 47.9 t ADT: 92

FDR 345

Good

Over: IRON CREEK

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

Built 1956 Load: 48.0 t ADT: 25

294th Street

Good

Over: Blind Creek

3N & 5.3W Beresford, Lincoln, SD

Built 2013 Load: 48.0 t ADT: 250

SD034

Good

Over: CK

5.2 E SANBORN CO LINE, Miner, SD

Built 2023 Load: 48.0 t ADT: 1,092

188 STREET

Good

Over: COBB CK

2.6E BRANDT, Deuel, SD

Built 2017 Load: 48.1 t ADT: 260

FAS 6313

Good

Over: BOXELDER CK

11 W 7.9 N LADNER, Harding, SD

Built 2013 Load: 48.1 t ADT: 25

161ST STREET

Good

Over: JAMES RIVER

4.2N 2.4E ASHTON, Spink, SD

Built 2004 Load: 48.1 t ADT: 50

476TH AVENUE

Good

Over: SIX MILE CK

2W & 0.4S WHITE, Brookings, SD

Built 2007 Load: 48.2 t ADT: 92

206TH STREET

Good

Over: CK

2.5S & 0.7W WHITE, Brookings, SD

Built 1999 Load: 48.2 t ADT: 92

US385

Good

Over: BEAVER CK

10.6 S JCT US 16, Custer, SD

Built 1992 Load: 48.2 t ADT: 2,380

349 AVENUE

Good

Over: SOUTH FORK WHETSTONE CK

2.4S & 1.1E OF LUCAS, Gregory, SD

Built 1997 Load: 48.3 t ADT: 36

476TH AVENUE

Good

Over: DEER CK

5E & 1.7N BROOKINGS, Brookings, SD

Built 1997 Load: 48.4 t ADT: 92

480TH AVENUE

Good

Over: CK

2.7N & 2E BUSHNELL, Brookings, SD

Built 1990 Load: 48.4 t ADT: 92

SD025

Good

Over: CK

2.1 N JCT US 14, Kingsbury, SD

Built 2023 Load: 48.4 t ADT: 1,339

164TH STREET

Good

Over: BOXELDER CK

1S 3.5E NEWUNDERWOOD, Pennington, SD

Built 2019 Load: 48.4 t ADT: 48

SD046

Good

Over: EAST FORK FROG CK

2.5 E JCT SD 19 N, Clay, SD

Built 1983 Load: 48.6 t ADT: 2,717

FDR 345

Good

Over: IRON CREEK

T 2 S R 6 E SEC 32, Custer, SD

Built 1958 Load: 48.6 t ADT: 25

264TH STREET

Good

Over: NORTH BR TWELVE MILE CK

10S & 1.8 W MITCHELL, Davison, SD

Built 2001 Load: 48.7 t ADT: 64

Showing 4,451-4,500 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.