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

SAGE CREEK ROAD

Fair

Over: SAGE CK

8.7W 5.8S WALL, Pennington, SD

Built 1977 Load: 26.9 t ADT: 352

387TH AVE

Fair

Over: SNAKE CREEK

2.3S ASHTON, Spink, SD

Built 1997 Load: 26.9 t ADT: 55

231 AVENUE

Fair

Over: LITTLE WHITE RV

1.3 N TUTHILL, Bennett, SD

Built 1976 Load: 27.1 t ADT: 119

464 AVENUE

Fair

Over: STRAY HORSE CK

.4W 5.2S KRANZBURG, Codington, SD

Built 1961 Load: 27.2 t ADT: 218

464 AVENUE

Fair

Over: STRAY HORSE CK

.4W 5.9S KRANZBURG, Codington, SD

Built 1961 Load: 27.2 t ADT: 218

IRR US012

Fair

Over: DEEP BANK CK

6.6 NW JCT SD 20, Corson, SD

Built 1965 Load: 27.2 t ADT: 1,102

SD ROUTE 87

Fair

Over: SD ROUTE 87

ON SD ROUTE 87, MP 43.1;, Custer, SD

Built 1940 Load: 27.2 t ADT: 326

SD020

Fair

Over: CK

3.7 E JCT SD 15, Grant, SD

Built 1956 Load: 27.2 t ADT: 249

151ST AVENUE

Fair

Over: CK

1.8E,0.4N,BOX ELDER, Pennington, SD

Built 1940 Load: 27.2 t ADT: 644

IRR BIA RTE 9

Fair

Over: LITTLE WHITE RIVER

4.0 KM N JCT US 18 & RT 9, Todd, SD

Built 1970 Load: 27.2 t ADT: 531

31128 472ND AVE.RD

Fair

Over: BRULE CK

13.1S BERESFORD, Union, SD

Built 1985 Load: 27.2 t ADT: 35

IRR US012

Fair

Over: BURLINGTON NORTHERN RR

0.2 W JCT SD 65 S, Corson, SD

Built 1936 Load: 27.3 t ADT: 483

SD079

Fair

Over: NORTH FORK GRAND RV

0.1 S NORTH DAKOTA LINE, Harding, SD

Built 1966 Load: 27.3 t ADT: 357

299th Street

Fair

Over: Medicine Creek

6W & 1.3N of Presho, Lyman, SD

Built 1968 Load: 27.3 t ADT: 25

425 AVE

Fair

Over: REDSTONE CK

N EDGE OF CARTHAGE, Miner, SD

Built 1965 Load: 27.3 t ADT: 125

US014

Fair

Over: COTTONWOOD CK

4.2 S JCT SD 34, Stanley, SD

Built 1960 Load: 27.3 t ADT: 749

THIRD STREET

Fair

Over: JAMES RV

3RD ST SE IN HURON, Beadle, SD

Built 1982 Load: 27.4 t ADT: 4,828

SD045

Fair

Over: CK

2.8 S JCT SD 34, Buffalo, SD

Built 1960 Load: 27.4 t ADT: 773

198TH ST

Fair

Over: TURTLE CK

0.1E ST LAWRENCE, Hand, SD

Built 1950 Load: 27.4 t ADT: 30

28170 433 AVE.

Fair

Over: CK

4.3N,2.0E OF MENNO, Hutchinson, SD

Built 1984 Load: 27.4 t ADT: 45

IRR AR US012

Fair

Over: BURLINGTON NORTHERN RR

0.3 E CORSON CO LINE, Walworth, SD

Built 1957 Load: 27.4 t ADT: 2,092

FOSTER STREET

Fair

Over: DRY RUN CK/RR

FOSTER ST - MITCHELL, Davison, SD

Built 1999 Load: 27.5 t ADT: 384

HISEGA DRIVE

Fair

Over: RAPID CK

HISEGA LODGE, Pennington, SD

Built 1973 Load: 27.5 t ADT: 207

SD073

Fair

Over: GRAND RV

0.3 S OF SHADEHILL, Perkins, SD

Built 1995 Load: 27.5 t ADT: 705

155TH ST

Fair

Over: CREEK

1.0S,0.8E NORTHVILLE, Spink, SD

Built 1940 Load: 27.5 t ADT: 31

SD020

Fair

Over: DRY RUN CK

1.6 W CLARK CO LINE, Spink, SD

Built 1959 Load: 27.5 t ADT: 558

SD044

Fair

Over: DRAW

0.7 SE OF FARMINGDALE, Pennington, SD

Built 1964 Load: 27.6 t ADT: 2,234

SD044

Fair

Over: CK

6.3 SE OF FARMINGDALE, Pennington, SD

Built 1964 Load: 27.6 t ADT: 1,463

I029

Fair

Over: CK

1.5 S SD 30 INTERCH, Brookings, SD

Built 1970 Load: 27.7 t ADT: 9,960

147th Street

Fair

Over: Snake Creek

1N & 7.3W of Mansfield, Brown, SD

Built 1990 Load: 27.7 t ADT: 98

US212

Fair

Over: SULPHUR CK

5.2 SW MEADE CO LINE, Butte, SD

Built 1956 Load: 27.8 t ADT: 494

SD034

Fair

Over: BEAR BUTTE CK

6.0 NE JCT SD 79N, Meade, SD

Built 2014 Load: 27.8 t ADT: 818

CAMBELL ST

Fair

Over: CK

0.5 N US 16B, Pennington, SD

Built 1964 Load: 27.8 t ADT: 18,870

SD034

Fair

Over: HAY CK

3.7 W JCT US 85, Butte, SD

Built 1956 Load: 27.9 t ADT: 1,042

MAIN ST-MARVIN

Fair

Over: BURLINGTON NORTHERN RR

MAIN STREET MARVIN, Grant, SD

Built 1940 Load: 27.9 t ADT: 125

SD028

Fair

Over: BIG SIOUX RV

2.3 W DEUEL CO LINE, Hamlin, SD

Built 1951 Load: 27.9 t ADT: 1,323

SD034

Fair

Over: DRY RUN CK

5.1 E JCT US 14 & 83, Hughes, SD

Built 1955 Load: 27.9 t ADT: 1,566

206 STREET

Fair

Over: MEDICINE KNOLL CK

0.4 E CANNING, Hughes, SD

Built 1965 Load: 27.9 t ADT: 59

164TH ST

Fair

Over: SOUTH FORK SNAKE CK

N LIMITS OF ATHOL, Spink, SD

Built 1968 Load: 27.9 t ADT: 85

US012 W

Fair

Over: BURLINGTON NORTHERN RR

3.2 W JCT SD 37, Brown, SD

Built 1975 Load: 28.0 t ADT: 2,783

SD050

Fair

Over: PEASE CK

5.3 S JCT SD 44 E, Charles Mix, SD

Built 1955 Load: 28.0 t ADT: 550

27357 414 AVE.

Fair

Over: PONY CK

1.3N,3E NE COR. PARKSTON, Hutchinson, SD

Built 1955 Load: 28.0 t ADT: 23

WHITEWOOD VALLEY

Fair

Over: WHITEWOOD CK

4.0N 1.8E WHITWOOD, Lawrence, SD

Built 1966 Load: 28.0 t ADT: 49

US018

Fair

Over: Big Sioux River

at Iowa Border, Lincoln, SD

Built 1978 Load: 28.0 t ADT: 2,210

SD047

Fair

Over: WHITE RV

7.3 S I 90 INTERCH, Lyman, SD

Built 1954 Load: 28.0 t ADT: 642

HISEGA DRIVE

Fair

Over: RAPID CK

0.1E 0.1S HISEGA LDG, Pennington, SD

Built 1973 Load: 28.0 t ADT: 106

45590 271 ST

Fair

Over: ELCE CK

4N & 2.9E PARKER, Turner, SD

Built 2013 Load: 28.0 t ADT: 40

SD037

Fair

Over: ANTELOPE CK

2.3 S JCT US 12, Brown, SD

Built 1953 Load: 28.1 t ADT: 1,140

SD045

Fair

Over: BR CROW CK

1.8 N JCT SD 34, Buffalo, SD

Built 1958 Load: 28.1 t ADT: 503

SD022

Fair

Over: COBB CK

9.3 E JCT SD 15, Deuel, SD

Built 1955 Load: 28.1 t ADT: 1,030

Showing 1,901-1,950 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.