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

240th Street

Good

Over: Brookfield Creek

0.9E of Trent, Moody, SD

Built 2016 Load: 24.5 t ADT: 240

480th Avenue

Good

Over: Spring Creek

3.3N of Flandreau, Moody, SD

Built 2010 Load: 24.5 t ADT: 20

483rd Avenue

Good

Over: Spring Creek

4W & 0.2S of Ward, Moody, SD

Built 1997 Load: 24.5 t ADT: 115

238th Street

Good

Over: Pipestone Creek

2N & 8.8E of Trent, Moody, SD

Built 1961 Load: 24.5 t ADT: 145

THUNDERHEAD FALLS

Good

Over: RAPID CK

OFF THUNDERHEAD FALL, Pennington, SD

Built 1972 Load: 24.5 t ADT: 10

CEMETERY ROAD

Good

Over: GRIZZLY BEAR CK

0.3S JCT 16A40 KEYSTONE, Pennington, SD

Built 1974 Load: 24.5 t ADT: 150

TWILIGHT DRIVE

Good

Over: IOWA DITCH

0.3W OF RESERVOIR RD, Pennington, SD

Built 1998 Load: 24.5 t ADT: 389

ANDERSEN ROAD

Good

Over: RAPID CK

6.5W,2.2N OF CAPUTA, Pennington, SD

Built 1950 Load: 24.5 t ADT: 813

S ELLSWORTH RD

Good

Over: BOX ELDER CK

0.3S Ells Rd & Hwy 1416, Pennington, SD

Built 2001 Load: 24.5 t ADT: 100

SPRUCE STREET

Good

Over: BOXELDER CK

SPRUCE ST - BOX ELDER, Pennington, SD

Built 2012 Load: 24.5 t ADT: 175

151ST AVENUE

Good

Over: BOXELDER CK

1.8E .3S BOX ELDER, Pennington, SD

Built 1973 Load: 24.5 t ADT: 25

HWY 1416

Good

Over: CK

1N NEW UNDERWOOD, Pennington, SD

Built 1926 Load: 24.5 t ADT: 1,089

SPRING DRAW RD

Good

Over: SPRING CK DRAW

3.1W 3.1N SCENIC, Pennington, SD

Built 2011 Load: 24.5 t ADT: 22

HORTON RD.

Good

Over: UNNAMED CK

2.7 E 11.5 SO QUINN, Pennington, SD

Built 1962 Load: 24.5 t ADT: 35

BIG FOOT RD

Good

Over: UNNAMED CK

3.4E 6.4S QUINN, Pennington, SD

Built 1962 Load: 24.5 t ADT: 79

BORDER LINE ROAD

Good

Over: BR NORTH FORK GRAND RV

24.0 W WHITE BUTTE, Perkins, SD

Built 2011 Load: 24.5 t ADT: 60

BIXBY ROAD

Good

Over: MOREAU RV

5 W 26.6 S BISON, Perkins, SD

Built 1954 Load: 24.5 t ADT: 75

297 AVENUE

Good

Over: ARTICHOKE CK

12W & 6.4S GETTYSBURG, Potter, SD

Built 2003 Load: 24.5 t ADT: 10

311 AVENUE

Good

Over: CK

1.0E & 4.1S GETTYSBURG, Potter, SD

Built 1936 Load: 24.5 t ADT: 143

311 AVENUE

Good

Over: CK

4.4S & 1E GETTYSBURG, Potter, SD

Built 1936 Load: 24.5 t ADT: 143

112th Street

Good

Over: Trib to Little MN River

6.5S & 0.8E of Claire Cty, Roberts, SD

Built 2018 Load: 24.5 t ADT: 23

459th Avenue

Good

Over: Creek

4.6S of Jct with SD 10, Roberts, SD

Built 1941 Load: 24.5 t ADT: 5,850

459th Avenue

Good

Over: Creek

12.8S of Jct with SD 10, Roberts, SD

Built 1941 Load: 24.5 t ADT: 1,600

127th Street

Good

Over: Creek

2.3W of Peever, Roberts, SD

Built 1929 Load: 24.5 t ADT: 458

466th Avenue

Good

Over: Creek

1W & 0.1S of Wilmot, Roberts, SD

Built 1985 Load: 24.5 t ADT: 38

395TH AVENUE

Good

Over: SAND CK

2W & 6.3N WOONSOCKET, Sanborn, SD

Built 2011 Load: 24.5 t ADT: 56

COUNTY RD

Good

Over: SAND CK

3.9E & 4N WOONSOCKET, Sanborn, SD

Built 2002 Load: 24.5 t ADT: 5

243 ST

Good

Over: JAMES RV

7.5E 2.0S LETCHER, Sanborn, SD

Built 1985 Load: 24.5 t ADT: 45

227TH ST.

Good

Over: WEST REDSTONE CK

2.3E 6N ARTESIAN, Sanborn, SD

Built 2017 Load: 24.5 t ADT: 11

188TH ST

Good

Over: TURTLE CREEK

5S 7.9W TULARE, Spink, SD

Built 2010 Load: 24.5 t ADT: 21

156TH ST

Good

Over: SNAKE CREEK

2.0S 0.9W NORTHVILLE, Spink, SD

Built 2006 Load: 24.5 t ADT: 25

Town Street

Good

Over: Turtle Creek

7TH Street E of Redfield, Spink, SD

Built 2017 Load: 24.5 t ADT: 24

156TH ST

Good

Over: James River

2.0 S, 3.4 E MELLETT, Spink, SD

Built 1978 Load: 24.5 t ADT: 31

173RD SREET

Good

Over: TIMBER CREEK

3.9E FRANKFORT, Spink, SD

Built 2013 Load: 24.5 t ADT: 31

185TH STREET

Good

Over: FOSTER CREEK

5N & 0.5E BLOOMFIELD, Spink, SD

Built 2015 Load: 24.5 t ADT: 31

154TH STREET

Good

Over: CREEK

2.3E CONDE, Spink, SD

Built 1940 Load: 24.5 t ADT: 96

FAS6450

Good

Over: BIG PRAIRIE DOG CK

12M S & 1M W OF HAYES SD, Stanley, SD

Built 1992 Load: 24.5 t ADT: 47

FAS 3215 280 AVE

Good

Over: WILLOW CK

4 W JCT US 83, Stanley, SD

Built 2008 Load: 24.5 t ADT: 210

196 ST

Good

Over: COW CK

6.9S & 1.6E OKOBOJO, Sully, SD

Built 2006 Load: 24.5 t ADT: 180

295TH AVE

Good

Over: CK

8W & 0.1S of Onida, Sully, SD

Built 2014 Load: 24.5 t ADT: 26

185 ST

Good

Over: CK

6.2W ONIDA, Sully, SD

Built 2017 Load: 24.5 t ADT: 760

305 AVENUE

Good

Over: CK

1E & 9.5S ONIDA, Sully, SD

Built 2009 Load: 24.5 t ADT: 35

317 AVENUE

Good

Over: MEDICINE KNOLL CK

12.5 & 7.2S ONIDA, Sully, SD

Built 1995 Load: 24.5 t ADT: 25

IRR COUNTY ROAD

Good

Over: ANTELOPE CK

1.7S 5.0E MISSION, Todd, SD

Built 1994 Load: 24.5 t ADT: 27

IRR COUNTY ROAD

Good

Over: KEYA PAHA RV

14.2E & 6.0S OF MISSION, Todd, SD

Built 2000 Load: 24.5 t ADT: 20

273 STREET

Good

Over: COTTONWOOD CK

3.1E WITTEN, Tripp, SD

Built 1932 Load: 24.5 t ADT: 34

296 STREET

Good

Over: CK

2.5N & 8.2E MILLBORO, Tripp, SD

Built 1958 Load: 24.5 t ADT: 95

44020 290 ST.

Good

Over: CK

1N & 15.8W VIBORG, Turner, SD

Built 1992 Load: 24.5 t ADT: 100

44150 282ND ST

Good

Over: TURKEY RIDGE CK

8S & 5.5W MARION, Turner, SD

Built 1997 Load: 24.5 t ADT: 45

44640 283 AVE

Good

Over: CK

9.0S & 0.6W MARION, Turner, SD

Built 2004 Load: 24.5 t ADT: 75

Showing 3,451-3,500 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.