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

485 AVENUE

Good

Over: CK

3E & 1.7N ALBEE, Grant, SD

Built 2007 Load: 32.7 t ADT: 40

485 AVENUE

Good

Over: SOUTH FORK YELLOW BANK R

3E & 0.4S ALBEE, Grant, SD

Built 2017 Load: 32.7 t ADT: 35

151 STREET

Good

Over: NORTH FORK YELLOW BANK R

7.3E & 2S MILBANK, Grant, SD

Built 1965 Load: 32.7 t ADT: 52

162 STREET

Good

Over: CK

3.6E & 1S ALBEE, Grant, SD

Built 2018 Load: 32.7 t ADT: 52

165 ST

Good

Over: CK

1.7S & 5.3E REVILLO, Grant, SD

Built 2018 Load: 32.7 t ADT: 35

279 STREET

Good

Over: CK

3.1W & 2S JCT 44&47, Gregory, SD

Built 2018 Load: 32.7 t ADT: 36

450 AVE

Good

Over: CK

5W &.2S MADISON, Lake, SD

Built 1993 Load: 32.7 t ADT: 40

233 ST

Good

Over: CK

4.5 WEST OF MADISON, Lake, SD

Built 1993 Load: 32.7 t ADT: 35

902 N OLIVE AVE

Good

Over: CK

OLIVE AVE - MADISON, Lake, SD

Built 1979 Load: 32.7 t ADT: 400

224 9TH STR NE

Good

Over: PARK CK

9TH ST NW - MADISON, Lake, SD

Built 1994 Load: 32.7 t ADT: 315

317 HARTH AVE

Good

Over: PARK CK

HARTH AVE - MADISON, Lake, SD

Built 2000 Load: 32.7 t ADT: 386

316 N LEE AVE

Good

Over: PARK CK

LEE AVE N - MADISON, Lake, SD

Built 2000 Load: 32.7 t ADT: 386

415 N WASHNGTN AVE

Good

Over: PARK CK

WASH&3RD AVE NE - MADISON, Lake, SD

Built 1996 Load: 32.7 t ADT: 200

111 GRANT AVENUE

Good

Over: PARK CK

GRANT AVE S - MADISON, Lake, SD

Built 2000 Load: 32.7 t ADT: 200

725 4TH STR SE

Good

Over: PARK CK

4TH ST SE - MADISON, Lake, SD

Built 2000 Load: 32.7 t ADT: 386

460 AVE

Good

Over: BATTLE CK

5E & 3.6N MADISON, Lake, SD

Built 2009 Load: 32.7 t ADT: 345

241 ST

Good

Over: BUFFALO CK

2.1W & 0.2S CHESTER, Lake, SD

Built 1998 Load: 32.7 t ADT: 270

472nd Avenue

Good

Over: Beaver Creek

1.5N of Worthing, Lincoln, SD

Built 2021 Load: 32.7 t ADT: 100

Bridge Street

Good

Over: Beaver Creek

N. Bridge Street - Canton, Lincoln, SD

Built 2014 Load: 32.7 t ADT: 4

243 ST

Good

Over: WOLF CK

10S & 3.5W HOWARD, Miner, SD

Built 2003 Load: 32.7 t ADT: 20

IRR BIA RTE 27

Good

Over: WOUNDED KNEE TRIBUTARY

0.7 KM N OF WOUNDED KNEE, Oglala Lakota, SD

Built 2011 Load: 32.7 t ADT: 500

HAMMERQUIST ROAD

Good

Over: RAPID CK

0.4 W,FARMINGDALE, Pennington, SD

Built 2017 Load: 32.7 t ADT: 54

331 AVENUE

Good

Over: BUFFALO CK

11.5E 0.8N WEWELA, Tripp, SD

Built 2020 Load: 32.7 t ADT: 31

47330 312TH ST

Good

Over: CK

13.7S & 1.2E BERESFORD, Union, SD

Built 1950 Load: 32.7 t ADT: 20

26930 373rd Avenue

Good

Over: Platte Creek

6.7N & 6.0E of Platte, Charles Mix, SD

Built 2008 Load: 32.8 t ADT: 22

413th Avenue

Good

Over: Creek

3.7N & 2.0W Carpenter, Clark, SD

Built 2017 Load: 32.8 t ADT: 39

41660 269 ST.

Good

Over: TWELVE MILE CK

6N & 5.6E PARKSTON, Hutchinson, SD

Built 1997 Load: 32.8 t ADT: 45

450th Avenue

Good

Over: Little Vermillion River

0.8S & 9E of Salem, McCook, SD

Built 2021 Load: 32.8 t ADT: 66

225 ST

Good

Over: E FORK VERMILLION RV

8N & 7.1E HOWARD, Miner, SD

Built 2003 Load: 32.8 t ADT: 20

Dusty Ridge Road

Good

Over: MITCHELL CK

2 W & 5.1 N MIDLAND, Haakon, SD

Built 1960 Load: 32.9 t ADT: 39

SD028

Good

Over: TRIB DOLPH CK

4.3 W JCT SD 21 N, Hamlin, SD

Built 2021 Load: 32.9 t ADT: 1,240

SD022

Good

Over: TRIB BIG SIOUX

2.7 E JCT US81, Hamlin, SD

Built 2021 Load: 32.9 t ADT: 1,168

69th Street

Good

Over: BNSF Railroad

0.5E of Cliff Avenue, Lincoln, SD

Built 2010 Load: 32.9 t ADT: 11,600

232nd Street

Good

Over: Creek

9N & 6.2W PRESHO, Lyman, SD

Built 2017 Load: 32.9 t ADT: 24

US083

Good

Over: LITTLE WHITE RV

2 N OF WHITE RIVER, Mellette, SD

Built 2022 Load: 32.9 t ADT: 1,375

102nd Street

Good

Over: Maple River

5.3N & 2E of Frederick, Brown, SD

Built 1992 Load: 33.0 t ADT: 98

389th Avenue

Good

Over: Moccasin Creek

2E & 1.4S of Warner, Brown, SD

Built 2020 Load: 33.0 t ADT: 98

SNOMA RD

Good

Over: MALONEY CK

9.1E 1.0S OF BELLE F, Butte, SD

Built 2022 Load: 33.0 t ADT: 175

WINKLER ROAD

Good

Over: HORSE CK

4.3 W 2 N NEWELL, Butte, SD

Built 2020 Load: 33.0 t ADT: 47

29810 UNIV. RD

Good

Over: ASH CK

13E & 1.1S IRENE, Clay, SD

Built 2017 Load: 33.0 t ADT: 285

SD038

Good

Over: BURLINGTON NORTHER/SF RR

0.8 E JCT I 90 LOOP, Davison, SD

Built 1989 Load: 33.0 t ADT: 2,719

335 Ave

Good

Over: Creek

6.2S & 2W GREGORY, Gregory, SD

Built 2004 Load: 33.0 t ADT: 16

ANTELOPE CREEK RD

Good

Over: RAPID CK

0.8 W & 0.4 S CAPUTA, Pennington, SD

Built 1980 Load: 33.0 t ADT: 44

SD073

Good

Over: FLINT ROCK CK

3.4 N MEADE CO LINE, Perkins, SD

Built 2016 Load: 33.0 t ADT: 452

133rd Street

Good

Over: Mina Lake

1N & 2E of Jct with US 12, Edmunds, SD

Built 2008 Load: 33.1 t ADT: 200

269 ST

Good

Over: LONG CK

8N & 2.9W CHANCELLOR, Turner, SD

Built 2022 Load: 33.1 t ADT: 97

129th Street

Good

Over: Foot Creek

4N & 3.8W of Aberdeen, Brown, SD

Built 2019 Load: 33.2 t ADT: 98

STONE LAKE RD

Good

Over: HORSE CK

0.1 N 4 W NEWELL, Butte, SD

Built 2002 Load: 33.2 t ADT: 302

W. 5TH ST MILLER

Good

Over: REE CK

MILLER, Hand, SD

Built 1991 Load: 33.2 t ADT: 15

296 AVENUE

Good

Over: DRY RUN CK

6.2E & 1.3N PIERRE, Hughes, SD

Built 1995 Load: 33.2 t ADT: 62

Showing 3,851-3,900 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.