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

250th Street

Fair

Over: E. Fork of Vermillion Rv

2.5N & 9.6E of Salem, McCook, SD

Built 1972 Load: 24.5 t ADT: 66

451st Avenue

Fair

Over: Trib. to E Fork Verm Rv

5.7S & 5E of Canistota, McCook, SD

Built 1984 Load: 24.5 t ADT: 160

Valley Road

Fair

Over: Trib. to E Fork Verm Rv

0.3E & 1.6N of Montrose, McCook, SD

Built 1957 Load: 24.5 t ADT: 400

Hawk Drive

Fair

Over: E. Fork of Vermillion Rv

3.5N & 5.7E of Canistota, McCook, SD

Built 1993 Load: 24.5 t ADT: 66

267th Street

Fair

Over: E. Fork of Vermillion Rv

12.5S & 1.3E of Montrose, McCook, SD

Built 1976 Load: 24.5 t ADT: 40

371st Avenue

Fair

Over: Willow Creek

2.1 S & 8 E of Leola, McPherson, SD

Built 1990 Load: 24.5 t ADT: 95

WHITEWOOD VALLEYRD

Fair

Over: CROW CK

2 W & 9.9 N STURGIS, Meade, SD

Built 1972 Load: 24.5 t ADT: 25

194TH ST.

Fair

Over: WHITEWOOD CK

12.0 N 0.6 W STURGIS, Meade, SD

Built 1977 Load: 24.5 t ADT: 24

ELK CREEK RD.

Fair

Over: ELK CK

0.2 S 2.7 E PIEDMONT, Meade, SD

Built 1951 Load: 24.5 t ADT: 240

MIDDLE ALKALI RD.

Fair

Over: CK

13E & 2.1S STURGIS, Meade, SD

Built 1965 Load: 24.5 t ADT: 15

143RD AVE.

Fair

Over: BOXELDER CK

16E & 17.7S STURGIS, Meade, SD

Built 1966 Load: 24.5 t ADT: 15

ELK VALE RD.

Fair

Over: ALKALI CK

19E & 3.3S STURGIS, Meade, SD

Built 1986 Load: 24.5 t ADT: 53

ANTELOPE CREEK RD

Fair

Over: ANTELOPE CK

24E & 13.8S STURGIS, Meade, SD

Built 1976 Load: 24.5 t ADT: 56

HEREFORD RD.

Fair

Over: CK

29E & 3.4N STURGIS, Meade, SD

Built 1960 Load: 24.5 t ADT: 55

BREHM RD.

Fair

Over: ELK CK

29E & 15.7S STURGIS, Meade, SD

Built 1995 Load: 24.5 t ADT: 10

OLD 212(KILLDEAR)

Fair

Over: CAMP CK

7S &0.2W MUD BUTTE, Meade, SD

Built 1967 Load: 24.5 t ADT: 15

OLD212 KILLDEER RD

Fair

Over: MUD BUTTE CK

2 S MUDBUTTE, Meade, SD

Built 1952 Load: 24.5 t ADT: 15

STONEVILLE RD.

Fair

Over: SULFUR CK

12.5 S JCT US 212, Meade, SD

Built 1970 Load: 24.5 t ADT: 233

STONEVILLE RD.

Fair

Over: HORSE CREEK

7.5 S JCT US 212, Meade, SD

Built 1974 Load: 24.5 t ADT: 233

PLEASANT VIEW RD.

Fair

Over: RED OWL CK

0.5S & 3.3E RED OWL, Meade, SD

Built 1955 Load: 24.5 t ADT: 10

FOX RIDGE RD.

Fair

Over: PINE CK

1.8E 6.2S OPAL, Meade, SD

Built 1999 Load: 24.5 t ADT: 33

FOX RIDGE RD.

Fair

Over: SULPHUR CK

5E & 5.8N RED OWL, Meade, SD

Built 1995 Load: 24.5 t ADT: 20

AVANCE RD.

Fair

Over: CHERRY CK

13N&18.4EUNIONCENTER, Meade, SD

Built 1984 Load: 24.5 t ADT: 33

OLD MARCUS RD

Fair

Over: RED OWL CK

7.9 W & 23.7S FAITH, Meade, SD

Built 1982 Load: 24.5 t ADT: 45

BRUSHIE CREEK RD.

Fair

Over: CK

12 S & 6.1 W FAITH, Meade, SD

Built 1970 Load: 24.5 t ADT: 23

OLD MARCUS RD.

Fair

Over: RED OWL CK

8 N 1 E PLAINVIEW, Meade, SD

Built 1991 Load: 24.5 t ADT: 26

225 ST

Fair

Over: WEST REDSTONE CK

3S & 6.8W CARTHAGE, Miner, SD

Built 1989 Load: 24.5 t ADT: 10

230 ST

Fair

Over: DRY RUN CK

3.0N & 0.6W FEDORA, Miner, SD

Built 1974 Load: 24.5 t ADT: 75

421 AVE

Fair

Over: CK

3.5N FEDORA, Miner, SD

Built 1973 Load: 24.5 t ADT: 85

227 ST

Fair

Over: DRY RUN CK

5.0S & 3.1W CARTHAGE, Miner, SD

Built 1973 Load: 24.5 t ADT: 75

424 AVE

Fair

Over: ROCK CK

11.0W & 1.6S CANOVA, Miner, SD

Built 1973 Load: 24.5 t ADT: 75

427 AVE

Fair

Over: ROCK CK

2.0E & 1.6S CARTHAGE, Miner, SD

Built 1901 Load: 24.5 t ADT: 75

225 ST

Fair

Over: CREEK

3S & 2.5 E Carthage, Miner, SD

Built 1973 Load: 24.5 t ADT: 35

236 ST

Fair

Over: ROCK CK

3S & 6.2W HOWARD, Miner, SD

Built 1976 Load: 24.5 t ADT: 25

434 AVE

Fair

Over: WEST FORK VERMILLION RV

4.3N HOWARD, Miner, SD

Built 1940 Load: 24.5 t ADT: 40

236 ST

Fair

Over: WEST FORK VERMILLION RV

3S & 1.2E OF HOWARD, Miner, SD

Built 1998 Load: 24.5 t ADT: 15

237 ST

Fair

Over: WEST FORK VERMILLION RV

1.3E & 4S HOWARD, Miner, SD

Built 1986 Load: 24.5 t ADT: 90

241 ST

Fair

Over: WEST FORK VERMILLION RV

1.0 M N. & 1.2 E. CANOVA, Miner, SD

Built 1973 Load: 24.5 t ADT: 250

437 AVE

Fair

Over: WEST FORK VERMILLION RV

3E & 9.6S HOWARD, Miner, SD

Built 1961 Load: 24.5 t ADT: 25

243 ST

Fair

Over: WEST FORK VERMILLION RV

10S & 3.2E HOWARD, Miner, SD

Built 1961 Load: 24.5 t ADT: 25

WESTERN AVENUE

Fair

Over: TRIB TO SKUNK CR

CITY OF HARTFORD, Minnehaha, SD

Built 1952 Load: 24.5 t ADT: 1,535

ELLIS RD, HWY 139

Fair

Over: TRIB TO WILLOW CK

2.2N ELLIS, Minnehaha, SD

Built 1954 Load: 24.5 t ADT: 3,273

476TH AVENUE

Fair

Over: TRIB TO SILVER CREEK

2E & 3.1S BALTIC, Minnehaha, SD

Built 1938 Load: 24.5 t ADT: 41

PERRY PLACE

Fair

Over: TRIB TO BIG SIOUX RV

4.6S & 1.8W BRANDON, Minnehaha, SD

Built 1935 Load: 24.5 t ADT: 14

HOLLY BLVD,HWY 140

Fair

Over: BIG SIOUX RIVER

1.4W BRANDON, Minnehaha, SD

Built 1999 Load: 24.5 t ADT: 9,978

264TH STREET

Fair

Over: BEAVER CREEK

2.5S & 0.6W BRANDON, Minnehaha, SD

Built 1992 Load: 24.5 t ADT: 126

ASPEN BLVD,HWY 138

Fair

Over: SPLIT ROCK CREEK

0.6E & 0.5S BRANDON, Minnehaha, SD

Built 1988 Load: 24.5 t ADT: 7,782

220th Street

Fair

Over: Lake Campbell

Lake Campbell, Moody, SD

Built 1965 Load: 24.5 t ADT: 200

471st Avenue

Fair

Over: Trib. to Big Sioux River

1E & 10.9N of Colman, Moody, SD

Built 1925 Load: 24.5 t ADT: 614

471st Avenue

Fair

Over: Trib. to Jack Moore Crk

1E & 4.6N of Colman, Moody, SD

Built 1925 Load: 24.5 t ADT: 330

Showing 1,551-1,600 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.