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

274 ST

Good

Over: PONY CK

1N & 2E Parkston, Hutchinson, SD

Built 1990 Load: 19.1 t ADT: 50

27800 416 AVE.

Good

Over: SOUTH BR DRY CK

5 E 2 S PARKSTON SD, Hutchinson, SD

Built 1987 Load: 19.1 t ADT: 18

27640 417 AVE

Good

Over: NORTH BR DRY CK

6 E 0.4 S PARKSTON, Hutchinson, SD

Built 1991 Load: 19.1 t ADT: 48

27130 418 AVE.

Good

Over: SOUTH FORK TWELVE MILE C

1.9W 1.8N MILLTOWN, Hutchinson, SD

Built 1979 Load: 19.1 t ADT: 27

41960 284 STR.

Good

Over: LONETREE CK

2.0N & 6.4W OF OLIVET, Hutchinson, SD

Built 1984 Load: 19.1 t ADT: 50

42520 284 ST

Good

Over: CK

2.0N & 0.8W OF OLIVET, Hutchinson, SD

Built 2004 Load: 19.1 t ADT: 40

28950 SW. RIVER RD

Good

Over: CK

3.5S & 0.9E OLIVET, Hutchinson, SD

Built 1995 Load: 19.1 t ADT: 69

28470 CO. RD 11

Good

Over: Furlong Creek

1.3N,2.7W OF MENNO, Hutchinson, SD

Built 1995 Load: 19.1 t ADT: 69

42980 277 ST.

Good

Over: WOLF CK

1.0N,8.2W OF FREEMAN, Hutchinson, SD

Built 1980 Load: 19.1 t ADT: 45

27320 431 AVE.

Good

Over: WOLF CK

12.8 N MENNO, Hutchinson, SD

Built 1997 Load: 19.1 t ADT: 94

27050 432 AVE.

Good

Over: WOLF CK

1.5N,5.0E OF CLAYTON, Hutchinson, SD

Built 1991 Load: 19.1 t ADT: 35

27280 432 AVE.

Good

Over: CK

0.8S,5.0E OF CLAYTON, Hutchinson, SD

Built 1986 Load: 19.1 t ADT: 35

43290 289 ST.

Good

Over: CK

3 S & 1.9 E MENNO, Hutchinson, SD

Built 1978 Load: 19.1 t ADT: 20

SPRINGBROOK DR.

Good

Over: ARROWHEAD DRAIN

SHERIDAN LK RD INTER - RC, Pennington, SD

Built 1994 Load: 19.1 t ADT: 50

DRAINAGE DITCH

Good

Over: COBALT DRIVE

200'N WEST NIKE ROAD, Pennington, SD

Built 2008 Load: 19.1 t ADT: 100

E. MEADE ST.

Good

Over: MEADE ST DRAINAGE DITCH

E MEADE & HAINES CT - RC, Pennington, SD

Built 2007 Load: 19.1 t ADT: 500

ASPEN DRIVE

Good

Over: MEADE ST DRAINAGE DITCH

E MEADE & ASPEN - RC, Pennington, SD

Built 2014 Load: 19.1 t ADT: 300

SEGER DRIVE

Good

Over: DRAINAGE DITCH

0.5W ELK VALE RD, Pennington, SD

Built 2009 Load: 19.1 t ADT: 10

EAST MALL DRIVE

Good

Over: DRAINAGE DITCH

0.5W ELK VALE RD, Pennington, SD

Built 2006 Load: 19.1 t ADT: 100

ELK VALE ROAD

Good

Over: BOXELDER CK

3.9W 0.6N BOX ELDER - RC, Pennington, SD

Built 1989 Load: 19.1 t ADT: 852

WHITE HILL ROAD

Good

Over: BIG NASTY CK

3.5W 11.5N PRAIRIE, Perkins, SD

Built 1991 Load: 19.1 t ADT: 33

Ellingson Road

Good

Over: CK

8W 6.8N LODGEPOLE, Perkins, SD

Built 1991 Load: 19.1 t ADT: 44

157 STREET

Good

Over: DEEP CK

11.3W 9.2N FAITH, Perkins, SD

Built 1997 Load: 19.1 t ADT: 6

RIEDY ROAD

Good

Over: CK

THUNDER HAWK CREEK, Perkins, SD

Built 1991 Load: 19.1 t ADT: 50

300 STREET

Good

Over: LOST CK

1.5S & 0.7E MILLBORO, Tripp, SD

Built 2002 Load: 19.1 t ADT: 36

316 AVENUE

Good

Over: KEYA PAHA TRIBUTARY

3.5W & 6N WEWELA, Tripp, SD

Built 2004 Load: 19.1 t ADT: 30

275 STREET

Good

Over: WEST BRANCH BULL CK

15.1E 3N WINNER, Tripp, SD

Built 2003 Load: 19.1 t ADT: 50

31870 477TH AVE

Good

Over: COUNTY DITCH

0.5N JCT SD 50, Union, SD

Built 1948 Load: 19.1 t ADT: 300

199th Street

Good

Over: James River

9.0N & 3.5E of Huron, Beadle, SD

Built 1981 Load: 19.2 t ADT: 56

PALMER GULCH RD

Good

Over: SPRING CREEK

2.6E & 0.8N Hill City, Pennington, SD

Built 2016 Load: 19.2 t ADT: 122

210TH STREET

Good

Over: NORTH DEER CK

2N & 3.8W BROOKINGS, Brookings, SD

Built 1995 Load: 19.3 t ADT: 99

FDR 186

Good

Over: FALSE BOTTOM CREEK

T 5 N R 2 E SEC 24, Lawrence, SD

Built 2003 Load: 19.4 t ADT: 25

467TH AVENUE

Good

Over: CK

3E & 0.8S VOLGA, Brookings, SD

Built 2001 Load: 19.6 t ADT: 90

472ND AVENUE

Good

Over: NORTH DEER CK

8.2N & 1.0E BROOKINGS, Brookings, SD

Built 2005 Load: 19.6 t ADT: 25

211TH STREET

Good

Over: DEER CK

3.9E & 1N BROOKINGS, Brookings, SD

Built 2015 Load: 19.6 t ADT: 77

476TH AVENUE

Good

Over: CK

0.6S & 2W WHITE, Brookings, SD

Built 2001 Load: 19.6 t ADT: 92

477TH AVENUE

Good

Over: SIX MILE CK

1W & 0.3N WHITE, Brookings, SD

Built 1999 Load: 19.6 t ADT: 92

209TH STREET

Good

Over: TRIBUTARY TO BIG SIOUX R

2.0N & 0.5W BUSHNELL, Brookings, SD

Built 2006 Load: 19.6 t ADT: 38

479TH AVENUE

Good

Over: DEER CK

1E & 1.3N BUSHNELL, Brookings, SD

Built 2002 Load: 19.6 t ADT: 92

398TH AVENUE

Good

Over: NORTH BR TWELVE MILE CK

13 W & 0.2 N ETHAN, Davison, SD

Built 2003 Load: 19.6 t ADT: 64

265TH STREET

Good

Over: NORTH BR TWELVE MILE CK

11.6 W JCT SD 37, Davison, SD

Built 2008 Load: 19.6 t ADT: 214

400TH AVENUE

Good

Over: ENEMY CK

9 W & 5.3 S MITCHELL, Davison, SD

Built 1990 Load: 19.6 t ADT: 38

401ST AVENUE

Good

Over: CREEK

4 E MT VERNON, Davison, SD

Built 2009 Load: 19.6 t ADT: 350

403 AVE

Good

Over: NORTH BR TWELVE MILE CK

8.0W 0.1N ETHAN, Davison, SD

Built 2006 Load: 19.6 t ADT: 80

411 AVE

Good

Over: CK

7.5S 2.0E MITCHELL, Davison, SD

Built 1998 Load: 19.6 t ADT: 64

167TH ST

Good

Over: CK

4N & 1.3E ROCKHAM, Faulk, SD

Built 1936 Load: 19.6 t ADT: 36

204 ST

Good

Over: SOUTH FORK PEARL CK

4 N & 0.5 E IROQUOIS, Kingsbury, SD

Built 1987 Load: 19.6 t ADT: 75

456TH AVENUE

Good

Over: TRIB WEST BR SKUNK CK

1W & 0.5S BUFFALO TRADING, Minnehaha, SD

Built 2000 Load: 19.6 t ADT: 54

249TH STREET

Good

Over: TRIB WEST BR SKUNK CK

1S & 0.4W BUFFALO TRADING, Minnehaha, SD

Built 1998 Load: 19.6 t ADT: 47

266TH STREET

Good

Over: LONG CREEK

8S & 0.1E HUMBOLDT, Minnehaha, SD

Built 2002 Load: 19.6 t ADT: 16

Showing 3,101-3,150 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.