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

254TH ST, HWY 122

Good

Over: TRIB WEST BR SKUNK CK

5.0 N & 3.4 W HARTFORD, Minnehaha, SD

Built 2004 Load: 65.0 t ADT: 418

266th Street

Good

Over: Tributary to Wolf Creek

6.8W&1S of Stanley Corner, McCook, SD

Built 2019 Load: 66.0 t ADT: 30

SD034

Good

Over: CK

3.2 E I 29 INTERCH, Moody, SD

Built 2009 Load: 66.0 t ADT: 1,942

398 AVE

Good

Over: TRIB STONY RUN CK

SW HURON - WEST PARK AVE, Beadle, SD

Built 2005 Load: 66.2 t ADT: 700

210 ST (21ST SW)

Good

Over: STONY RUN CK

SW CORNER OF HURON, Beadle, SD

Built 2005 Load: 66.2 t ADT: 700

415th Avenue

Good

Over: Antelope Creek

3.3N & 4W of Pierpont, Day, SD

Built 2004 Load: 66.2 t ADT: 30

I090 W

Good

Over: SILVER CK

1.1 W SD 115 INTERCH, Minnehaha, SD

Built 1992 Load: 66.7 t ADT: 13,405

I090 E

Good

Over: SILVER CK

1.1 W SD 115 INTERCH, Minnehaha, SD

Built 1993 Load: 66.7 t ADT: 13,405

508 NE FIRST STR

Good

Over: PARK CK

1ST ST NE - MADISON, Lake, SD

Built 2003 Load: 67.1 t ADT: 290

SD038

Good

Over: CK

1.9 W I 29 INTERCH, Minnehaha, SD

Built 1949 Load: 67.8 t ADT: 4,563

US385

Good

Over: CK

0.9 N JCT US 18 W, Fall River, SD

Built 1982 Load: 67.9 t ADT: 4,070

29020 434 AVE.

Good

Over: CK

4.2S,3.0E OF MENNO, Hutchinson, SD

Built 1991 Load: 67.9 t ADT: 35

SD046

Good

Over: CK

6.6 W JCT SD 25, Bon Homme, SD

Built 1966 Load: 68.2 t ADT: 753

SD034

Good

Over: BULL CK

E EDGE OF UNION CENTER, Meade, SD

Built 1973 Load: 68.3 t ADT: 945

415th Avenue

Good

Over: Antelope Creek

4.1N & 4.0W of Pierpont, Day, SD

Built 2000 Load: 68.6 t ADT: 69

289th Street

Good

Over: Saddle Creek

7S & 3.9W of Canton, Lincoln, SD

Built 2015 Load: 68.7 t ADT: 80

US081

Good

Over: CK

0.4 S JCT SD 44, Hutchinson, SD

Built 1994 Load: 68.8 t ADT: 2,638

406TH AVENUE

Good

Over: ENEMY CK

2W 4.6 S MITCHELL, Davison, SD

Built 2009 Load: 68.9 t ADT: 114

467 AVENUE

Good

Over: PEG MUNKY RUN

11 W & 1.5 S TORONTO, Deuel, SD

Built 2003 Load: 68.9 t ADT: 40

SD045

Good

Over: CK

0.5 S MCPHERSON CO LINE, Edmunds, SD

Built 1992 Load: 68.9 t ADT: 352

NEW YORK STREET

Good

Over: DRAINAGE DITCH

0.1W OF E. BLVD ON NY ST, Pennington, SD

Built 2001 Load: 69.0 t ADT: 5,250

US083

Good

Over: MCCLAREM LK OUTLET

2.0S OF HERREID, Campbell, SD

Built 2006 Load: 69.2 t ADT: 1,071

IRR SD020

Good

Over: CK

5.2 E JCT SD 63, Dewey, SD

Built 1997 Load: 69.5 t ADT: 882

SD047

Good

Over: WATERHOLE CK

23.0N 1.0W GREGORY, Lyman, SD

Built 2018 Load: 69.5 t ADT: 248

FRANKLIN CREEK RD

Good

Over: WILLOW CK

3W & 5.5N KADOKA, Jackson, SD

Built 2010 Load: 70.1 t ADT: 15

SD073

Good

Over: SPOOK CK

3.5 S OF FAITH, Meade, SD

Built 1987 Load: 70.3 t ADT: 882

SD050

Good

Over: BR PEASE CK

3.6 S OF GEDDES, Charles Mix, SD

Built 1954 Load: 70.4 t ADT: 550

I090

Good

Over: MORRIS CK

0.2 SE TILFORD INTERCH, Meade, SD

Built 1956 Load: 70.4 t ADT: 18,380

SD036

Good

Over: SPOKANE CK

3.9 E JCT US 16A, Custer, SD

Built 1991 Load: 70.6 t ADT: 730

226TH ST.

Good

Over: CK

.8W 10N ARTESIAN, Sanborn, SD

Built 2020 Load: 70.8 t ADT: 56

57th Street

Good

Over: Drainage Channel

west of Western Avenue, Minnehaha, SD

Built 1997 Load: 70.9 t ADT: 12,500

SD037

Good

Over: DRAINAGE DITCH

2.7 S JCT SD 44, Hutchinson, SD

Built 2000 Load: 71.1 t ADT: 2,294

IRR SD020

Good

Over: CK

3.3 E JCT SD 63, Dewey, SD

Built 1997 Load: 71.7 t ADT: 882

HUETHER RD

Good

Over: CK

1.0W 5.3N CONATA, Pennington, SD

Built 1981 Load: 72.2 t ADT: 25

SD248

Good

Over: BIG BUFFALO CK

1 E OF CACTUS FLATS, Jackson, SD

Built 2020 Load: 72.3 t ADT: 104

SD045

Good

Over: CK

2.6 S I 90 INTERCH, Brule, SD

Built 1949 Load: 73.3 t ADT: 1,047

SD248

Good

Over: WHITE WILLOW CK

1.4 W OF KADOKA, Jackson, SD

Built 2020 Load: 73.4 t ADT: 215

155 ST.

Good

Over: LITTLE CHEYENNE CK

5.1W & 9N OF GETTYSBURG, Potter, SD

Built 2008 Load: 73.5 t ADT: 25

145TH STREET

Good

Over: Creek

3N & 0.1W VERDON, Brown, SD

Built 2015 Load: 73.8 t ADT: 98

147TH STREET

Good

Over: Creek

1N & 0.1W VERDON, Brown, SD

Built 2015 Load: 73.8 t ADT: 98

406TH AVENUE

Good

Over: Creek

0.6N & 0.4E FERNEY, Brown, SD

Built 2015 Load: 73.8 t ADT: 98

407TH AVENUE

Good

Over: Creek

1E & 3.6S GROTON, Brown, SD

Built 2015 Load: 73.8 t ADT: 98

409TH AVENUE

Good

Over: Creek

1.9N & 3E GROTON, Brown, SD

Built 2015 Load: 73.8 t ADT: 37

US212

Good

Over: DEER CK

2.2 NE OF NEWELL, Butte, SD

Built 1956 Load: 73.8 t ADT: 494

466th Avenue

Good

Over: Trib. to Stray Horse Crk

7.0E & 1.6N of Castlewood, Hamlin, SD

Built 2005 Load: 74.0 t ADT: 80

SD044

Good

Over: CK

12.5 SE OF SCENIC, Pennington, SD

Built 1983 Load: 74.2 t ADT: 486

482nd Avenue

Good

Over: Trib. to Pattee Creek

4W & 2.8S of Fairview, Lincoln, SD

Built 2019 Load: 74.4 t ADT: 355

SD046

Good

Over: CK

3.5 W JCT SD 37, Bon Homme, SD

Built 1964 Load: 74.5 t ADT: 758

SD037

Good

Over: SOUTH BR DRY CK

7.1N OF TRIPP, Hutchinson, SD

Built 2000 Load: 74.8 t ADT: 2,294

I090 W

Good

Over: CK

0.4 W SD 38 INTERCH, Minnehaha, SD

Built 2023 Load: 74.8 t ADT: 7,615

Showing 4,701-4,750 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.