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

RANDALL ROAD

Good

Over: RANDALL CK

14.6E FAIRFAX, Gregory, SD

Built 1992 Load: 24.5 t ADT: 36

COUNTY RD

Good

Over: ASH CK

17.6N & 13.7W OF PHILIP, Haakon, SD

Built 1998 Load: 24.5 t ADT: 28

227th St

Good

Over: GRINDSTONE CK

5.1N & 0.6W PHILIP, Haakon, SD

Built 2012 Load: 24.5 t ADT: 245

Park Avenue

Good

Over: BAD RV

0.6S JCT US14 & SD73, Haakon, SD

Built 1998 Load: 24.5 t ADT: 20

Airport Road

Good

Over: MEDICINE CK

3.0E & 7.4N PHILIP, Haakon, SD

Built 2006 Load: 24.5 t ADT: 65

COUNTY RD

Good

Over: BUZZARD CK

11N & 5.2E PHILIP, Haakon, SD

Built 2007 Load: 24.5 t ADT: 34

COUNTY RD

Good

Over: SOUTH CK

4.1S&7-2E MILESVILLE, Haakon, SD

Built 2009 Load: 24.5 t ADT: 28

COUNTY RD

Good

Over: DEEP RUN CK

0.5N & 0.8W KIRLEY, Haakon, SD

Built 1994 Load: 24.5 t ADT: 50

COUNTY RD

Good

Over: CK

4W & 8.7N MIDLAND, Haakon, SD

Built 2000 Load: 24.5 t ADT: 28

459th Avenue

Good

Over: Trib. to Big Sioux River

3.3N of Castlewood, Hamlin, SD

Built 2000 Load: 24.5 t ADT: 375

354TH AVE

Good

Over: WOLF CK

6W & 7N MILLER, Hand, SD

Built 1995 Load: 24.5 t ADT: 43

366 AVE

Good

Over: SHAEFER CK

6 E & 14.8 N MILLER, Hand, SD

Built 1935 Load: 24.5 t ADT: 25

188 ST

Good

Over: WOLF CK

10N,3.7E ST LAWRENCE, Hand, SD

Built 1974 Load: 24.5 t ADT: 67

370 AVE

Good

Over: CK

2E & 5.3S ROCKHAM, Hand, SD

Built 1999 Load: 24.5 t ADT: 43

COUNTY RD

Good

Over: SAND CK

10E & 13.7S MILLER, Hand, SD

Built 2012 Load: 24.5 t ADT: 15

180 ST

Good

Over: CK

8.0S 3.7E ROCKHAM SD, Hand, SD

Built 2013 Load: 24.5 t ADT: 15

373 AVE

Good

Over: CK

5E & 8.2S ROCKHAM, Hand, SD

Built 1950 Load: 24.5 t ADT: 29

374TH AVE

Good

Over: CK

2.6N WESSINGTON SPRINGS, Hand, SD

Built 1994 Load: 24.5 t ADT: 190

41220 264 STREET

Good

Over: TWELVE MILE CK

7S & 8.8W ALEXANDRIA, Hanson, SD

Built 2002 Load: 24.5 t ADT: 60

42890 255 STR

Good

Over: WOLF CK

2.0 S & 2.9 E FARMER, Hanson, SD

Built 2003 Load: 24.5 t ADT: 60

42890 256 STREET

Good

Over: WOLF CK

5 N & 0.1 W EMERY, Hanson, SD

Built 1966 Load: 24.5 t ADT: 60

LEWTON RD

Good

Over: SLICK CK

3.0W & 7.7N C.CROOK, Harding, SD

Built 2012 Load: 24.5 t ADT: 70

COUNTY RD

Good

Over: NORTH FORK STICK CK

8.4 N CAMP CROOK, Harding, SD

Built 2001 Load: 24.5 t ADT: 44

CAMP CROOK RD

Good

Over: SHAW CK

11 W 1.6 S LADNER, Harding, SD

Built 1961 Load: 24.5 t ADT: 36

CAMP CROOK RD

Good

Over: SOUTH FORK MOREAU RV

20.3 S & 2.6 E CAMP CROOK, Harding, SD

Built 1999 Load: 24.5 t ADT: 50

COUNTY RD

Good

Over: DRY HOUSE CK

3.5 S 6.9 W LADNER, Harding, SD

Built 2003 Load: 24.5 t ADT: 45

HARDING RD

Good

Over: VALLEY CK

6.9E & 3.0S CAMP CROOK, Harding, SD

Built 2004 Load: 24.5 t ADT: 75

OLD HWY 85

Good

Over: BOXELDER CK

3.0E & 4.3N BUFFALO, Harding, SD

Built 2021 Load: 24.5 t ADT: 60

COX RD

Good

Over: CROOKED CK

5.2 N 2.5 W LUDLOW, Harding, SD

Built 2016 Load: 24.5 t ADT: 87

PARK RD

Good

Over: WEST SQUAW CK

2.5S & 11.5W OF REVA, Harding, SD

Built 2008 Load: 24.5 t ADT: 45

LUDLOW RD

Good

Over: COAL BANK CK

6.5 E LUDLOW, Harding, SD

Built 1987 Load: 24.5 t ADT: 91

LUDLOW RD

Good

Over: LEMS CK

8.2 E LUDLOW, Harding, SD

Built 1987 Load: 24.5 t ADT: 91

287 AVENUE

Good

Over: SPRING CK

9 N & 0.5 W PIERRE, Hughes, SD

Built 2008 Load: 24.5 t ADT: 125

287 AVENUE

Good

Over: SPRING CK TRIB

8.2N & 0.5W PIERRE, Hughes, SD

Built 2016 Load: 24.5 t ADT: 150

MISSOURI AVE

Good

Over: CAPITOL CK

MISSOURI AV GRIFFN PIERRE, Hughes, SD

Built 2001 Load: 24.5 t ADT: 400

309 AVENUE

Good

Over: BR MEDICINE CK

4.4 S BLUNT, Hughes, SD

Built 1962 Load: 24.5 t ADT: 110

26920 408 AVE

Good

Over: SOUTH FORK TWELVE MILE C

2.0 W & 0.8 N DIMOCK, Hutchinson, SD

Built 2004 Load: 24.5 t ADT: 55

MAIN ST

Good

Over: PONY CK

MAIN ST - PARKSTON, Hutchinson, SD

Built 1999 Load: 24.5 t ADT: 20

41750 273 STR.

Good

Over: PONY CK

2N & 6.5E PARKSTON, Hutchinson, SD

Built 1962 Load: 24.5 t ADT: 50

28510 424 AVE

Good

Over: LONETREE CK

0.9 N JCT US 18, Hutchinson, SD

Built 2010 Load: 24.5 t ADT: 135

27980 CO. RD. 11

Good

Over: CK

6.2N,1.8W OF MENNO, Hutchinson, SD

Built 2004 Load: 24.5 t ADT: 35

43100 278 STR.

Good

Over: CK

7 W FREEMAN, Hutchinson, SD

Built 1958 Load: 24.5 t ADT: 432

341 AVENUE

Good

Over: WEST FORK ELM CK

4E 3.2S STEPHAN, Hyde, SD

Built 2009 Load: 24.5 t ADT: 60

268 STREET

Good

Over: Pass Creek

4N & 4.5E LONG VALLEY, Jackson, SD

Built 1990 Load: 24.5 t ADT: 45

441ST AVENUE

Good

Over: CK

1W 2.5S LK PRESTON, Kingsbury, SD

Built 1986 Load: 24.5 t ADT: 200

443 AVE

Good

Over: CK

5.4N & .7E WINFRED, Lake, SD

Built 1938 Load: 24.5 t ADT: 25

462 AVE

Good

Over: BATTLE CK

0.7S RUTLAND, Lake, SD

Built 1988 Load: 24.5 t ADT: 45

STATE PARK RD

Good

Over: CROW CK

7.1W 2.8N SPEARFISH, Lawrence, SD

Built 2017 Load: 24.5 t ADT: 5

CAMP COMFORT ROAD

Good

Over: HIGGINS GULCH

0.5N SPEARFISH, Lawrence, SD

Built 2003 Load: 24.5 t ADT: 500

KIRK RD

Good

Over: WHITEWOOD CK

0.7E Int. SD 14A, Lawrence, SD

Built 1990 Load: 24.5 t ADT: 25

Showing 3,351-3,400 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.