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

I090 W

Good

Over: BIG BUFFALO CK

1.0 E SD 240 S INTERCH, Jackson, SD

Built 1967 Load: 33.2 t ADT: 3,335

I090 E

Good

Over: BIG BUFFALO CK

1.0 E SD 240 S INTERCH, Jackson, SD

Built 1967 Load: 33.2 t ADT: 3,335

245th Street

Good

Over: E. Fork of Vermillion Rv

6.1E of Center, McCook, SD

Built 2020 Load: 33.2 t ADT: 85

262nd Street

Good

Over: E. Fork of Vermillion Rv

7.5S & 0.9E of Montrose, McCook, SD

Built 2020 Load: 33.2 t ADT: 66

252ND ST, HWY 118

Good

Over: COLTON CK

4S & 0.1E COLTON, Minnehaha, SD

Built 2023 Load: 33.2 t ADT: 739

250TH ST, HWY 114

Good

Over: SKUNK CK

2S & 2.9E COLTON, Minnehaha, SD

Built 2017 Load: 33.2 t ADT: 1,297

204TH STREET

Good

Over: OAKWOOD LAKE OVERFLOW

1.7W & 1S BRUCE, Brookings, SD

Built 1962 Load: 33.3 t ADT: 432

482ND AVENUE

Good

Over: Deer Creek

9.4N & 4W ELKTON, Brookings, SD

Built 2019 Load: 33.3 t ADT: 228

3rd Avenue NW

Good

Over: Big Sioux River

0.3E of 10th Street NW, Codington, SD

Built 2022 Load: 33.3 t ADT: 4,035

REDIG RD

Good

Over: CK

14.7 E REDIG, Harding, SD

Built 2018 Load: 33.3 t ADT: 28

HELLMER WIDDOS RD

Good

Over: REDWATER RV

2E 5.5N SPEARFISH, Lawrence, SD

Built 2022 Load: 33.3 t ADT: 69

I090 W

Good

Over: WEST FORK VERMILLION RV

0.6 W US 81 INTERCH, McCook, SD

Built 2022 Load: 33.3 t ADT: 6,370

250TH STREET

Good

Over: TRIB WEST BR SKUNK CK

2S & 0.2E BUFFALO TRADING, Minnehaha, SD

Built 2019 Load: 33.3 t ADT: 22

BIA RTE 4

Good

Over: CAMPBELL CREEK

8 KM SE OF FT THOMPSON, Buffalo, SD

Built 2013 Load: 33.4 t ADT: 1,720

SHERMAN STREET

Good

Over: RAPID CK

SILVER CITY, Pennington, SD

Built 2023 Load: 33.4 t ADT: 305

US014

Good

Over: LITTLE PRAIRIE DOG CK

1.9 N HAAKON CO LINE, Stanley, SD

Built 1960 Load: 33.4 t ADT: 650

IRR BIA RTE 4

Good

Over: CUT MEAT CREEK

3KM SW OF PARMALEE, Todd, SD

Built 2004 Load: 33.4 t ADT: 200

SD019

Good

Over: VERMILLION RV

4.2 S JCT SD 46, Clay, SD

Built 2004 Load: 33.5 t ADT: 830

BIA RTE 5

Good

Over: LITTLE WHITE RIVER

SPRING CREEK, Todd, SD

Built 2003 Load: 33.5 t ADT: 100

459TH AVE

Good

Over: LONG CK

6.6N & 2W CHANCELLOR, Turner, SD

Built 2009 Load: 33.5 t ADT: 97

472 AVENUE

Good

Over: NORTH FORK YELLOW BANK R

3.4N SD 20, Grant, SD

Built 2021 Load: 33.6 t ADT: 213

SD020

Good

Over: CK

0.9 S JCT SD 158, Grant, SD

Built 2021 Load: 33.6 t ADT: 1,368

SD047

Good

Over: CK

2.8 N NEBRASKA STATE LINE, Gregory, SD

Built 1961 Load: 33.6 t ADT: 448

509 CENTER STR E

Good

Over: MADISON CK

CENTER ST E - MADISON, Lake, SD

Built 2020 Load: 33.6 t ADT: 1,283

PRIVATE RD

Good

Over: RAPID CK

OFF THUNDERHEAD FALLS RD, Pennington, SD

Built 1972 Load: 33.6 t ADT: 30

185 STREET

Good

Over: MEDICINE CK

13.6E ONIDA, Sully, SD

Built 2021 Load: 33.6 t ADT: 150

SD019

Good

Over: VERMILLION RV

1.9 S JCT SD 46, Clay, SD

Built 2004 Load: 33.7 t ADT: 830

SD019

Good

Over: VERMILLION RV

6.5 S JCT SD 46, Clay, SD

Built 2004 Load: 33.7 t ADT: 830

407TH AVENUE

Good

Over: SOUTH FORK TWELVE MILE C

2W & 13.4 S MITCHELL, Davison, SD

Built 2019 Load: 33.7 t ADT: 64

451st Avenue

Good

Over: Trib. to E Fork Verm Rv

3.2S of Montrose, McCook, SD

Built 1959 Load: 33.7 t ADT: 585

I090 W

Good

Over: LITTLE ELK CK

0.5 NW PIEDMONT INTERCH, Meade, SD

Built 2017 Load: 33.7 t ADT: 11,460

I090 E

Good

Over: SKUNK CK

0.8 E SD 38 INTERCH, Minnehaha, SD

Built 2008 Load: 33.7 t ADT: 8,550

SONQUIST LANE

Good

Over: RAPID CK

0.3W 0.2S JOHNSON SD, Pennington, SD

Built 2022 Load: 33.7 t ADT: 54

FDR 181

Good

Over: CASTLE CREEK

T 1 N R 4 E SEC 8, Pennington, SD

Built 1985 Load: 33.7 t ADT: 25

SD050

Good

Over: DRAINAGE DITCH

2.5 SE JCT SD 25, Bon Homme, SD

Built 1955 Load: 33.8 t ADT: 2,674

469TH AVENUE

Good

Over: CK

5.5S & 2W BROOKINGS, Brookings, SD

Built 2023 Load: 33.9 t ADT: 684

US018 P

Good

Over: CHEYENNE RV

0.2 N OF EDGEMONT, Fall River, SD

Built 2016 Load: 33.9 t ADT: 310

US018 W

Good

Over: HORSEHEAD CK

6 N JCT US 385 S, Fall River, SD

Built 2011 Load: 33.9 t ADT: 945

198 STREET

Good

Over: MEDICINE KNOLL CK

1.2 E BLUNT, Hughes, SD

Built 2012 Load: 33.9 t ADT: 45

266th Street

Good

Over: Wolf Creek

1S & 2.2W of Bridgewater, McCook, SD

Built 2006 Load: 33.9 t ADT: 30

OPAL RD.

Good

Over: CK

9 S 5 E MAURINE, Meade, SD

Built 2022 Load: 33.9 t ADT: 59

435 AVE

Good

Over: WEST FORK VERMILLION RV

1E & 2S HOWARD, Miner, SD

Built 2020 Load: 33.9 t ADT: 336

SD011

Good

Over: ELLIS & EASTERN RR

0.5 S JCT SD 264, Minnehaha, SD

Built 1989 Load: 33.9 t ADT: 8,590

230 ST

Good

Over: PATTERSON CK

10.8E 2.0S N.UNDERWOOD, Pennington, SD

Built 2006 Load: 33.9 t ADT: 9

157 ST

Good

Over: CHEYENNE CK

7N & 6.8W GETTYSBURG, Potter, SD

Built 2018 Load: 33.9 t ADT: 12

45940 280 ST

Good

Over: VERMILLION RV

3S & 1.7W CHANCELLOR, Turner, SD

Built 2019 Load: 33.9 t ADT: 254

IRR BIA RTE 4

Good

Over: GREEN GRASS CREEK

3.2 KM WEST OF HWY SD-63, Dewey, SD

Built 2013 Load: 34.0 t ADT: 195

JUNCTION AVENUE

Good

Over: BEAR BUTTE CK

JUNCTION AVE - STURGIS, Meade, SD

Built 1998 Load: 34.0 t ADT: 800

237th Street

Good

Over: Pipestone Creek

8.8E & 3N of Trent, Moody, SD

Built 2020 Load: 34.0 t ADT: 30

45890 291ST STREET

Good

Over: CK

2.9E VIBORG, Turner, SD

Built 2021 Load: 34.0 t ADT: 257

Showing 3,901-3,950 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.