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

Private Driveway

Good

Over: Drainage Channel

W1/2 LOT-BLK10-N BENSN-SF, Minnehaha, SD

Built 2000 Load: 25.1 t ADT: 20

IRR SD063

Good

Over: CUT MEAT CK

0.3 W OF PARMELEE, Todd, SD

Built 2002 Load: 25.1 t ADT: 609

SD050

Good

Over: DRAINAGE DITCH

0.9 W IOWA LINE, Union, SD

Built 1960 Load: 25.1 t ADT: 1,147

SD258

Good

Over: SNOW CK

0.3N PLANKINTON INTERCH, Aurora, SD

Built 1965 Load: 25.2 t ADT: 807

458TH AVENUE

Good

Over: TURKEY RIDGE CK

2E & 0.8N VIBORG, Turner, SD

Built 2017 Load: 25.2 t ADT: 96

Private Driveway

Good

Over: Drainage Channel

Lot A Block 11-Benson Rd, Minnehaha, SD

Built 2000 Load: 25.5 t ADT: 20

Private Driveway

Good

Over: Drainage Channel

Tract 3Block 11-Benson Rd, Minnehaha, SD

Built 2000 Load: 25.5 t ADT: 20

Private Driveway

Good

Over: Drainage Channel

E1/2 LOT7&8 BL10 N BEN-SF, Minnehaha, SD

Built 2000 Load: 25.5 t ADT: 20

Private Driveway

Good

Over: Drainage Channel

LOT 9 BLK 10-N BENSON-SF, Minnehaha, SD

Built 2000 Load: 25.5 t ADT: 20

Private Driveway

Good

Over: Drainage Channel

Lot 10 Block 10-Benson Rd, Minnehaha, SD

Built 2000 Load: 25.5 t ADT: 20

47690 310TH ST

Good

Over: CK

8.5S & 2.1W ALCESTER, Union, SD

Built 2020 Load: 25.7 t ADT: 30

387th Avenue

Good

Over: Elm River

0.5N of Westport, Brown, SD

Built 1998 Load: 25.8 t ADT: 98

FULTON STREET

Good

Over: DEADMAN GULCH

FULTON ST - STURGIS, Meade, SD

Built 1979 Load: 25.8 t ADT: 50

404th Avenue

Good

Over: Pearl Creek

4.1E & 8.4S of Huron, Beadle, SD

Built 1995 Load: 25.9 t ADT: 56

27380 366th Avenue

Good

Over: Platte Creek

2.2N & 1.0W of Platte, Charles Mix, SD

Built 2019 Load: 25.9 t ADT: 48

40130 305th Street

Good

Over: Choteau Creek

5.0S & 1.3E of Dante, Charles Mix, SD

Built 2019 Load: 25.9 t ADT: 48

SD1806

Good

Over: WHETSTONE CK

8.0 N JCT US 18, Gregory, SD

Built 1977 Load: 25.9 t ADT: 158

28240 417 AVE.

Good

Over: CK

6 E 4.6 N TRIPP S.D., Hutchinson, SD

Built 2014 Load: 25.9 t ADT: 45

383 AVENUE

Good

Over: CK

1E 2S WESS. SPRINGS, Jerauld, SD

Built 1963 Load: 25.9 t ADT: 180

42150 288 ST

Good

Over: SOUTH BR LONETREE CK

4.5W & 2.0S OF OLIVET, Hutchinson, SD

Built 2005 Load: 26.1 t ADT: 50

476TH AVENUE

Good

Over: MEDARY CK

1.0S AURORA, Brookings, SD

Built 2003 Load: 26.2 t ADT: 257

464th Avenue

Good

Over: Big Sioux River

1W & 0.2S of Estelline, Hamlin, SD

Built 1990 Load: 26.2 t ADT: 66

47610 316 ST

Good

Over: BRULE CK

8.0N & 0.1E ELK POINT, Union, SD

Built 2006 Load: 26.2 t ADT: 32

217th Street

Good

Over: Sand Creek

4W & 3.5S of Virgil, Beadle, SD

Built 1995 Load: 26.3 t ADT: 56

247TH STREET

Good

Over: JAMES RV

7 N 0.2 E MITCHELL, Davison, SD

Built 1975 Load: 26.3 t ADT: 466

45880 298 ST.

Good

Over: FROG CK

1S & 6.8E IRENE, Clay, SD

Built 2011 Load: 26.4 t ADT: 50

EXIT 10 SERVICE RD

Good

Over: SPEARFISH CK

0.2 W JCT US 85, Lawrence, SD

Built 1971 Load: 26.4 t ADT: 2,000

196th Street

Good

Over: Creek

6N & 5.7E of Wessington, Beadle, SD

Built 1939 Load: 26.5 t ADT: 131

480th Avenue

Good

Over: Beaver Creek

1.2N CANTON, Lincoln, SD

Built 2014 Load: 26.5 t ADT: 63

247th Street

Good

Over: Wolf Creek

5N & 0.5E of Spencer, McCook, SD

Built 2001 Load: 26.5 t ADT: 145

SD044

Good

Over: BR CHOTEAU CK

5.2 E JCT US 281 S, Douglas, SD

Built 1960 Load: 26.6 t ADT: 1,721

WHITE GATES

Good

Over: LITTLE ELK CREEK

T 3 N R 5 E SEC 11, Meade, SD

Built 1973 Load: 26.6 t ADT: 100

29840 458 AVE

Good

Over: FLYNN DICKERSON DITCH

1.4S & 6E IRENE, Clay, SD

Built 2004 Load: 26.7 t ADT: 45

ROOSEVELT STREET N

Good

Over: MOCCASIN CREEK

ROOSEVELT AVE - ABERDEEN, Brown, SD

Built 1995 Load: 26.8 t ADT: 3,845

465th Avenue

Good

Over: Hidewood Creek

1.7N of Estelline, Hamlin, SD

Built 2005 Load: 26.8 t ADT: 720

SD115

Good

Over: NINE MILE CK

1.5 W & .7 S HARRISBURG, Lincoln, SD

Built 2011 Load: 26.8 t ADT: 2,592

459TH AVENUE

Good

Over: WEST BR SKUNK CK

5W & 4.3S COLTON, Minnehaha, SD

Built 2003 Load: 26.8 t ADT: 71

45500 282 ST

Good

Over: CK

1N & 1W HURLEY, Turner, SD

Built 2016 Load: 26.8 t ADT: 97

413th Avenue

Good

Over: Creek

5.0 S & 1.0 W of RAYMOND, Clark, SD

Built 2020 Load: 26.9 t ADT: 42

403RD AVENUE

Good

Over: CK

8 W 5.8 N ETHAN, Davison, SD

Built 2013 Load: 26.9 t ADT: 208

COUNTY RD

Good

Over: ROCK CK

1S & 2.1E CARTHAGE, Miner, SD

Built 1990 Load: 26.9 t ADT: 30

240th Street

Good

Over: Pipestone Creek

8.1E of Trent, Moody, SD

Built 1994 Load: 26.9 t ADT: 165

NORTH STREET

Good

Over: DRAINAGE DITCH

0.1W OF EAST BLVD & N ST, Pennington, SD

Built 1980 Load: 26.9 t ADT: 6,017

478TH AVE, HWY 121

Good

Over: SLIP-UP CREEK

4E & 1.3S BALTIC, Minnehaha, SD

Built 2013 Load: 27.0 t ADT: 1,152

US014

Good

Over: CK

7.6 E HYDE CO LINE, Hand, SD

Built 1935 Load: 27.1 t ADT: 1,935

US014

Good

Over: CK

8.6 E HYDE CO LINE, Hand, SD

Built 1935 Load: 27.2 t ADT: 1,935

IRR US018

Good

Over: CK

5.8 NW OF PINE RIDGE, Oglala Lakota, SD

Built 2011 Load: 27.2 t ADT: 2,241

305th Avenue

Good

Over: Stoney Butte Creek

1W & 1.4N of Presho, Lyman, SD

Built 1966 Load: 27.3 t ADT: 280

IRR US018

Good

Over: CK

3.9 N OF PINE RIDGE, Oglala Lakota, SD

Built 2011 Load: 27.3 t ADT: 3,442

48340 301ST

Good

Over: CK

3.4E ALCESTER, Union, SD

Built 2023 Load: 27.3 t ADT: 50

Showing 3,551-3,600 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.