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 E

Good

Over: WEST FORK VERMILLION RV

0.6 W US 81 INTERCH, McCook, SD

Built 2021 Load: 30.7 t ADT: 6,370

242 ST

Good

Over: WOLF CK

4.4W CANOVA, Miner, SD

Built 2008 Load: 30.7 t ADT: 105

EAST BOULEVARD

Good

Over: RAPID CK

0.1 N JCT SD 44 - RC, Pennington, SD

Built 1977 Load: 30.7 t ADT: 15,878

413 AVE

Good

Over: FORK OF REDSTONE CK

1.0 W 2.9 N ARTESIAN, Sanborn, SD

Built 2005 Load: 30.7 t ADT: 175

SD044

Good

Over: BNSF RR

3.3 W JCT SD 19, Turner, SD

Built 1976 Load: 30.7 t ADT: 2,330

139TH AVE WETZ RD

Good

Over: NINE MILE CK

7 E 0.9 S VALE, Butte, SD

Built 2001 Load: 30.8 t ADT: 25

TWNSHP RD 184TH AV

Good

Over: CK

2S & .5E CLEAR LAKE, Deuel, SD

Built 2009 Load: 30.8 t ADT: 25

365TH AVE

Good

Over: CK

5E & 18.7S MILLER, Hand, SD

Built 2020 Load: 30.8 t ADT: 25

SD079

Good

Over: CK

11.6 N JCT SD 20, Harding, SD

Built 1962 Load: 30.8 t ADT: 357

27810 418 AVE.

Good

Over: SOUTH BR DRY CK

11.9 N KAYLOR, Hutchinson, SD

Built 2020 Load: 30.8 t ADT: 183

242 ST

Good

Over: BR ROCK CK

11.5W CANOVA, Miner, SD

Built 2009 Load: 30.8 t ADT: 20

IRR US018

Good

Over: TRIB. TO WHITE CLAY CK

8.3 NW PINE RIDGE, Oglala Lakota, SD

Built 2011 Load: 30.8 t ADT: 2,241

30890 471 AVE.

Good

Over: BRULE CK

10.9S BERESFORD, Union, SD

Built 2017 Load: 30.8 t ADT: 400

SD1804

Good

Over: DRY CK

7.1 S JCT SD 44 & 50, Charles Mix, SD

Built 1970 Load: 30.9 t ADT: 124

SD044

Good

Over: PONY CK

1.7 E DOUGLAS CO LINE, Hutchinson, SD

Built 1959 Load: 30.9 t ADT: 1,598

258th Street

Good

Over: W. Fork of Vermillion Rv

5S & 0.1E of Salem, McCook, SD

Built 2008 Load: 30.9 t ADT: 50

E. MAIN ST.

Good

Over: RAPID CK

0.2W MAIN & LACROSS - RC, Pennington, SD

Built 1973 Load: 30.9 t ADT: 930

DEEP CREEK RD

Good

Over: FLINT CK

14.7W 4.8N FAITH, Perkins, SD

Built 2004 Load: 30.9 t ADT: 15

164TH ST

Good

Over: SOUTH FORK SNAKE CK

1 W ATHOL, Spink, SD

Built 1968 Load: 30.9 t ADT: 71

32050 475TH AVE

Good

Over: DRAINAGE DITCH

1W & 3.5N ELK POINT, Union, SD

Built 1993 Load: 30.9 t ADT: 45

266 ST

Good

Over: PLATTE CK

0.7W 14S WHITE LAKE, Aurora, SD

Built 2006 Load: 31.0 t ADT: 33

40430 301st Street

Good

Over: Dry Choteau Creek

0.8S & 4.3E of Dante, Charles Mix, SD

Built 2021 Load: 31.0 t ADT: 48

IRR COUNTY ROAD

Good

Over: TRIB TO LITTLE MOREAU R

3.0S 2.5E FIRESTEEL, Dewey, SD

Built 2008 Load: 31.0 t ADT: 10

IRR US018

Good

Over: TRIB. TO WHITE CLAY CK

7.1 NW PINE RIDGE, Oglala Lakota, SD

Built 2011 Load: 31.0 t ADT: 2,241

28010 454 AVE

Good

Over: CK

2.9N & 2W HURLEY, Turner, SD

Built 2018 Load: 31.0 t ADT: 650

CR 11 - 374 AVE

Good

Over: CREEK-TRIB TO WHITE LAKE

8 N WHITE LAKE, Aurora, SD

Built 2012 Load: 31.1 t ADT: 425

BITTERSWEET CREEK

Good

Over: CASTLE CREEK

T 1 N R 3 E SEC 12, Pennington, SD

Built 1965 Load: 31.1 t ADT: 25

US018

Good

Over: CK

6.3 E JCT SD 19, Turner, SD

Built 2018 Load: 31.1 t ADT: 1,280

SD047

Good

Over: CK

4.8 S JCT US 12, Walworth, SD

Built 2023 Load: 31.2 t ADT: 380

471ST STREET

Good

Over: BIG SIOUX RV

7.8S BROOKINGS, Brookings, SD

Built 2020 Load: 31.3 t ADT: 1,305

57th Street

Good

Over: BNSF Railroad

0.4W of SE Avenue - SF, Lincoln, SD

Built 2008 Load: 31.3 t ADT: 17,600

SD1804

Good

Over: PLATTE CK

5.9 S JCT SD 44 & 50, Charles Mix, SD

Built 1970 Load: 31.4 t ADT: 124

SD046

Good

Over: VERMILLION RV

0.2 E JCT SD 19 S, Clay, SD

Built 2020 Load: 31.4 t ADT: 2,694

SD034

Good

Over: COTTLE CK

1.7 NE JCT SD 79 N, Meade, SD

Built 2017 Load: 31.4 t ADT: 818

418 AVE

Good

Over: REDSTONE CK

7.0W & 5.8S CARTHAGE, Miner, SD

Built 2006 Load: 31.4 t ADT: 2

SHERIDAN LAKE ROAD

Good

Over: ARROWHEAD DRAIN

0.5NE SHRDN LK&CORRAL -RC, Pennington, SD

Built 1991 Load: 31.4 t ADT: 3,000

BISMARCK BRANCH RD

Good

Over: BELLE FOURCHE RV

8.6E 6.2S NEWELL, Butte, SD

Built 2007 Load: 31.5 t ADT: 47

46280 298 ST

Good

Over: BLIND CK

1S & 10.8E IRENE, Clay, SD

Built 2004 Load: 31.5 t ADT: 25

US014

Good

Over: CK

6.8 E HYDE CO LINE, Hand, SD

Built 1935 Load: 31.5 t ADT: 1,935

Bluejay Street

Good

Over: Lake Norden Outlet

1.5E of Lake Norden, Hamlin, SD

Built 2002 Load: 31.6 t ADT: 100

N. Career Avenue

Good

Over: Trib. to Skunk Creek

0.5S of W. 60th Street N., Minnehaha, SD

Built 2001 Load: 31.6 t ADT: 1,328

US281

Good

Over: FIRESTEEL CK

1.3 S N COUNTY LINE, Aurora, SD

Built 1959 Load: 31.7 t ADT: 1,115

170TH ST

Good

Over: James River

3N 1.2E REDFIELD, Spink, SD

Built 1981 Load: 31.7 t ADT: 55

462ND AVENUE

Good

Over: TRIB TO OAKWOOD LAKE

4W & 2.6N of Bruce, Brookings, SD

Built 2017 Load: 31.8 t ADT: 130

201ST STREET

Good

Over: UNNAMED TRIBUTARY

2.5N & 3.9W of White, Brookings, SD

Built 2017 Load: 31.8 t ADT: 41

138th Street

Good

Over: Snake Creek

10.3W & 4N of Warner, Brown, SD

Built 1993 Load: 31.8 t ADT: 98

118th Street

Good

Over: Elm River

2N & 2.2W of Westport, Brown, SD

Built 1988 Load: 31.8 t ADT: 44

361 ST

Good

Over: CK

1.2N MIRANDA, Faulk, SD

Built 2016 Load: 31.8 t ADT: 54

SD063

Good

Over: HERMAPHRODITE CK

0.5 S ZIEB-HAAK CO LINE, Haakon, SD

Built 1981 Load: 31.8 t ADT: 396

FDR 140

Good

Over: BOXELDER CREEK

T 3 N R 5 E SEC 28, Lawrence, SD

Built 1948 Load: 31.8 t ADT: 50

Showing 3,701-3,750 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.