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

SD027

Fair

Over: CK

4.2 S JCT SD 10, Marshall, SD

Built 1977 Load: 29.2 t ADT: 727

IRR SD013

Fair

Over: BIG SIOUX RV

2.0 N OF FLANDREAU, Moody, SD

Built 1964 Load: 29.2 t ADT: 1,135

CHERRY AVENUE

Fair

Over: RAPID CK

CHERRY & E ST JAMES - RC, Pennington, SD

Built 1974 Load: 29.2 t ADT: 400

SD020

Fair

Over: BIG SLOUGH CK

2.1 W JCT US 281, Spink, SD

Built 1955 Load: 29.2 t ADT: 975

SD053

Fair

Over: WILLOW CK

12.8 S JCT US 18, Tripp, SD

Built 1963 Load: 29.2 t ADT: 145

I029 S

Fair

Over: WILLOW CK

1.7 N US 212 INTERCH, Codington, SD

Built 1973 Load: 29.3 t ADT: 4,260

I029 N

Fair

Over: WILLOW CK

1.7 N US 212 INTERCH, Codington, SD

Built 1973 Load: 29.3 t ADT: 4,260

200TH ST

Fair

Over: REDSTONE CK

0.4 E OF BANCROFT, Kingsbury, SD

Built 1978 Load: 29.3 t ADT: 557

MURPHY ROAD

Fair

Over: MURPHY CK

6.6E HAYWARD, Pennington, SD

Built 1966 Load: 29.3 t ADT: 77

170TH Street

Fair

Over: Dove Creek

6S 5.5W ATHOL, Spink, SD

Built 1940 Load: 29.3 t ADT: 55

SD034

Fair

Over: HAY CK

4.2 W JCT US 85, Butte, SD

Built 1956 Load: 29.4 t ADT: 1,042

200TH ST

Fair

Over: SPIRIT LAKE OUTLET

7.3 MILES EAST OF BANCRFT, Kingsbury, SD

Built 1988 Load: 29.5 t ADT: 174

SD079

Fair

Over: NORTH WILLOW CK

4.9 S JCT SD 168, Butte, SD

Built 1968 Load: 29.6 t ADT: 660

CAMP CROOK RD

Fair

Over: CK

2.2N & 21.0W BUFFALO, Harding, SD

Built 1960 Load: 29.6 t ADT: 97

FAS 3214 270 AVE

Fair

Over: LANCE CK

1 NE OF WENDTE, Stanley, SD

Built 1972 Load: 29.6 t ADT: 85

IRR US018

Fair

Over: CHOTEAU CK

3.4 E OF US 281 JUNCTION, Charles Mix, SD

Built 1960 Load: 29.7 t ADT: 409

IRR SD020

Fair

Over: LAKE KAMPESKA OUTLET

1.3 SE JCT SD 139, Codington, SD

Built 1958 Load: 29.7 t ADT: 3,646

SD240

Fair

Over: BIG BUFFALO CK

1 S CACTUS FLAT, Jackson, SD

Built 1952 Load: 29.7 t ADT: 1,080

32ND STREET

Fair

Over: RAPID CK

0.1N 32ND ST & SD44 - RC, Pennington, SD

Built 1974 Load: 29.7 t ADT: 4,500

144th Street

Fair

Over: Moccasin Creek

1.8S & 0.7W of Warner, Brown, SD

Built 1989 Load: 29.8 t ADT: 98

US012

Fair

Over: N FORK WHETSTONE CK

0.6 W JCT SD 15, Grant, SD

Built 2013 Load: 29.8 t ADT: 2,317

333 AVENUE

Fair

Over: BULL CK

4.2N & 4W JCT 44&47, Gregory, SD

Built 1965 Load: 29.8 t ADT: 36

US018

Fair

Over: CREEK

0.1 E OF DOUGLAS CO LINE, Hutchinson, SD

Built 1961 Load: 29.8 t ADT: 738

466th Avenue

Fair

Over: Blind Creek

2.7N of Jct. SD Hwy 46, Lincoln, SD

Built 1964 Load: 29.8 t ADT: 252

I090 E

Fair

Over: RC,P&E RR

0.2 SE US 14A INTERCH, Meade, SD

Built 1963 Load: 29.8 t ADT: 10,470

NEMO RD.

Fair

Over: BOXELDER CK

11 S 0.6 W TILFORD, Meade, SD

Built 1974 Load: 29.8 t ADT: 500

SD063

Fair

Over: BLACK PIPE CK

1.8 E OF NORRIS, Mellette, SD

Built 1954 Load: 29.8 t ADT: 289

258TH ST, HWY 130

Fair

Over: DIVERSION DITCH

0.7W RENNER, Minnehaha, SD

Built 1966 Load: 29.8 t ADT: 2,082

HISEGA DRIVE

Fair

Over: RAPID CK

0.1S HISEGA LODGE, Pennington, SD

Built 1972 Load: 29.8 t ADT: 106

SD037

Fair

Over: CK

0.3 N JCT SD 50, Bon Homme, SD

Built 1959 Load: 29.9 t ADT: 1,327

SD037

Fair

Over: CROW CK DITCH

7.0 S JCT SD 10, Brown, SD

Built 1961 Load: 29.9 t ADT: 960

SD045

Fair

Over: CROW CK

2.2 N BRULE CO LINE, Buffalo, SD

Built 1960 Load: 29.9 t ADT: 971

SD071

Fair

Over: HAT CK

15 S OF HOT SPRINGS, Fall River, SD

Built 1975 Load: 29.9 t ADT: 239

SD158

Fair

Over: CK

0.2 W MINNESOTA LINE, Grant, SD

Built 1966 Load: 29.9 t ADT: 270

SD034

Fair

Over: PLUM CK

0.5 W STANLEY CO LINE, Haakon, SD

Built 1958 Load: 29.9 t ADT: 364

SD042

Fair

Over: GIDLE CK

1.2 E DAVISON CO LINE, Hanson, SD

Built 1958 Load: 29.9 t ADT: 474

NORRIS PEAK ROAD

Fair

Over: BOXELDER CK

1.1E 3.0N JOHNSON SD, Pennington, SD

Built 1972 Load: 29.9 t ADT: 471

SD044

Fair

Over: MO. RV (LK FRANCIS CASE)

GREGORY - CHARLES MIX CO, Charles Mix, SD

Built 1966 Load: 30.0 t ADT: 916

24510 420 AVENUE

Fair

Over: ROCK CK

1 E & 6.9 N FULTON, Hanson, SD

Built 1984 Load: 30.0 t ADT: 60

SD034

Fair

Over: EAST BR SMITH CK

6.8 W WESSINGTON SPRINGS, Jerauld, SD

Built 1952 Load: 30.0 t ADT: 1,179

268th Street

Fair

Over: Bull Creek

8.2W & 2S of Iona, Lyman, SD

Built 1964 Load: 30.0 t ADT: 10

10th Street

Fair

Over: Railroad Switchyard

east of Reid Street, Minnehaha, SD

Built 1930 Load: 30.0 t ADT: 12,500

SD075

Fair

Over: SOUTH FORK GRAND RV

7.9 N JCT SD 20, Perkins, SD

Built 1966 Load: 30.0 t ADT: 205

FAS 3214 270 AVE

Fair

Over: TOMAHAWK CK

JUST WEST OF WENDTE, Stanley, SD

Built 1967 Load: 30.0 t ADT: 71

SD048

Fair

Over: WEST UNION CK

2.5 W IOWA STATE LINE, Union, SD

Built 1960 Load: 30.0 t ADT: 1,134

IRR US012

Fair

Over: BURLINGTON NORTHERN RR

7.9 E PERKINS CO LINE, Corson, SD

Built 1936 Load: 30.1 t ADT: 436

SD022

Fair

Over: HIDEWOOD CK

0.6 E JCT SD 15, Deuel, SD

Built 1954 Load: 30.1 t ADT: 1,030

SD034

Fair

Over: EAST ELM CK

7.5 W OF UNION CENTER, Meade, SD

Built 1956 Load: 30.1 t ADT: 945

484TH AVE, HWY 109

Fair

Over: SPLIT ROCK CREEK

1W & 2.8S GARRETSON, Minnehaha, SD

Built 1974 Load: 30.1 t ADT: 448

SD037

Fair

Over: BR TIMBER CK

2.3 N JCT US 212, Spink, SD

Built 1957 Load: 30.1 t ADT: 446

Showing 2,001-2,050 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.