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

FOGELSON RD

Good

Over: FALSE BOTTOM CK

2.2 MI N & 1.2 W ST ONGE, Lawrence, SD

Built 1977 Load: 24.5 t ADT: 50

NEMO ROAD

Good

Over: BOXELDER CK

AT NEMO, Lawrence, SD

Built 1974 Load: 24.5 t ADT: 200

287th Street

Good

Over: Long Creek

8S & 0.5W of Lennox, Lincoln, SD

Built 1988 Load: 24.5 t ADT: 57

275th Street

Good

Over: Beaver Creek

3N & 0.7E of Lennox, Lincoln, SD

Built 1991 Load: 24.5 t ADT: 65

294th Street

Good

Over: Tributary to Blind Creek

3N & 3.9W of Beresford, Lincoln, SD

Built 1950 Load: 24.5 t ADT: 256

Western Avenue

Good

Over: Drainage Channel

0.4S of 69th Street, Lincoln, SD

Built 2001 Load: 24.5 t ADT: 100

Cody Road

Good

Over: Trib. to Spring Creek

Shindler, Lincoln, SD

Built 2015 Load: 24.5 t ADT: 30

482nd Avenue

Good

Over: Trib. to Big Sioux River

1E & 7.1N of Canton, Lincoln, SD

Built 2021 Load: 24.5 t ADT: 125

232nd Street

Good

Over: Creek

9N & 10.1W of Presho, Lyman, SD

Built 2010 Load: 24.5 t ADT: 24

238th Street

Good

Over: Stoney Butte Creek

3N & 1.5W of Presho, Lyman, SD

Built 2002 Load: 24.5 t ADT: 24

308th Avenue

Good

Over: Medicine Creek

3E of Presho, Lyman, SD

Built 2000 Load: 24.5 t ADT: 60

310th Avenue

Good

Over: Medicine Creek

5.0W of Kennebec, Lyman, SD

Built 2006 Load: 24.5 t ADT: 25

312th Avenue

Good

Over: Grouse Creek

3W & 4.4N of Kennebec, Lyman, SD

Built 2001 Load: 24.5 t ADT: 24

314th Avenue

Good

Over: Grouse Creek

1W & 2.9N of Kennebec, Lyman, SD

Built 1999 Load: 24.5 t ADT: 15

239th Street

Good

Over: Grouse Creek

2N & 0.3E of Kennebec, Lyman, SD

Built 2000 Load: 24.5 t ADT: 10

244th Street

Good

Over: Wolf Creek

8N & 0.7W of Spencer, McCook, SD

Built 2003 Load: 24.5 t ADT: 45

250th Street

Good

Over: W. Fork of Vermillion Rv

2N & 1.7W of Salem, McCook, SD

Built 2005 Load: 24.5 t ADT: 85

Valley Road

Good

Over: Trib. to E Fork Verm Rv

3.4N of Montrose, McCook, SD

Built 1956 Load: 24.5 t ADT: 252

363rd Avenue

Good

Over: Creek

0.5E & 6.6N of Leola, McPherson, SD

Built 1952 Load: 24.5 t ADT: 218

WHITEWOOD RD

Good

Over: TRIB TO BEAR BUTTE CK

WEST EDGE OF STURGIS, Meade, SD

Built 2006 Load: 24.5 t ADT: 875

SLY STREET

Good

Over: BEAR BUTTE CK

200' N INT OF SLY/DUDLEY, Meade, SD

Built 2013 Load: 24.5 t ADT: 400

VANOCKER CANYON RD

Good

Over: VANOCKER CK

0.5S EXIT 32 - STURGIS, Meade, SD

Built 2005 Load: 24.5 t ADT: 1,500

BEAR BUTTE RD.

Good

Over: SPRING CK

1E & 4.6N STURGIS, Meade, SD

Built 2001 Load: 24.5 t ADT: 145

194TH AVE.

Good

Over: SOUTH CANAL

12N & 2E STURGIS, Meade, SD

Built 1997 Load: 24.5 t ADT: 25

197TH AVE

Good

Over: CK

2.9E & 9N STURGIS, Meade, SD

Built 1954 Load: 24.5 t ADT: 36

130TH AVENUE

Good

Over: SOUTH CANAL

3E & 12.9N STURGIS, Meade, SD

Built 2004 Load: 24.5 t ADT: 16

CEMETERY RD.

Good

Over: SOUTH CANAL

5E &12.3N STURGIS, Meade, SD

Built 1996 Load: 24.5 t ADT: 15

COLONY PL.

Good

Over: BEAR BUTTE CK

5.5E & 2.4N STURGIS, Meade, SD

Built 2016 Load: 24.5 t ADT: 15

NINE MILE RD.

Good

Over: SPRING CK

8 E & 5 N STURGIS, Meade, SD

Built 1990 Load: 24.5 t ADT: 100

ELK CREEK RD.

Good

Over: ELK CK

0.4 S 2.5 E PIEDMONT, Meade, SD

Built 1951 Load: 24.5 t ADT: 240

ELK CREEK RD.

Good

Over: ELK CK

0.2 S 3.1 E PIEDMONT, Meade, SD

Built 1950 Load: 24.5 t ADT: 151

139TH AVE.

Good

Over: BEAR BUTTE CK

13.1E & 4.IN STURGIS, Meade, SD

Built 2010 Load: 24.5 t ADT: 33

ELK CREEK RD.

Good

Over: CK

0.4S 7.5E PIEDMONT, Meade, SD

Built 1950 Load: 24.5 t ADT: 136

ELK VALE RD.

Good

Over: ANTELOPE CK

17.7E 8.5S STURGIS, Meade, SD

Built 1982 Load: 24.5 t ADT: 50

ELK VALE RD.

Good

Over: ELK CK

11.9E 0.4N PIEDMONT, Meade, SD

Built 1970 Load: 24.5 t ADT: 85

OPAL RD.

Good

Over: PINE CK

9 S 1 E MAURINE, Meade, SD

Built 1999 Load: 24.5 t ADT: 42

FOX RIDGE RD.

Good

Over: CK

3.5N & 5E RED OWL, Meade, SD

Built 1994 Load: 24.5 t ADT: 60

UNITED SCHOOL RD.

Good

Over: CK

14.2S & 4W FAITH, Meade, SD

Built 1999 Load: 24.5 t ADT: 19

231 ST

Good

Over: ROCK CK

2N & 6.6W HOWARD, Miner, SD

Built 2005 Load: 24.5 t ADT: 10

COUNTY RD

Good

Over: WEST FORK VERMILLION RV

1N & 0.6E HOWARD, Miner, SD

Built 2001 Load: 24.5 t ADT: 20

FARMER AVE

Good

Over: WEST FORK VERMILLION RV

FARMER AVE. - HOWARD, Miner, SD

Built 1994 Load: 24.5 t ADT: 75

S MAIN AVE

Good

Over: TURTLE CK

0.7S Inter SD38-Hartford, Minnehaha, SD

Built 2002 Load: 24.5 t ADT: 50

FEYDER AVE

Good

Over: TURTLE CK

.2N Int Mickelson-Hartfor, Minnehaha, SD

Built 2000 Load: 24.5 t ADT: 50

E MICKELSON RD

Good

Over: TURTLE CK

.1W Int SD38-Hartford, Minnehaha, SD

Built 2019 Load: 24.5 t ADT: 30

Ellis Road

Good

Over: Trib. to Skunk Creek

0.2N of 12th Street - SF, Minnehaha, SD

Built 2000 Load: 24.5 t ADT: 4,700

Discovery Avenue

Good

Over: Drainage Channel

0.1S of 12th Street, Minnehaha, SD

Built 2002 Load: 24.5 t ADT: 100

264TH ST, HWY 142

Good

Over: BIG SIOUX RIVER

2.5S & 1.1W BRANDON, Minnehaha, SD

Built 1992 Load: 24.5 t ADT: 4,733

264TH STREET

Good

Over: BEAVER CREEK

0.6E & 2.5S BRANDON, Minnehaha, SD

Built 1989 Load: 24.5 t ADT: 30

483RD AVENUE

Good

Over: BEAVER CREEK

1E & 2.4S BRANDON, Minnehaha, SD

Built 1989 Load: 24.5 t ADT: 93

474th Avenue

Good

Over: Bachelor Creek

3.0W & 1.3N of Trent, Moody, SD

Built 2003 Load: 24.5 t ADT: 705

Showing 3,401-3,450 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.