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 EB ON RAMP

Good

Over: MORRIS CK

0.2 SE TILFORD INTERCH, Meade, SD

Built 1963 Load: 99.9 t ADT: 224

MORRIS CREEK PL.

Good

Over: MORRIS CK

8E & 8.8S STURGIS, Meade, SD

Built 2020 Load: 99.9 t ADT: 10

CROSS ROAD

Good

Over: CK

SUMMERSET, Meade, SD

Built 2008 Load: 99.9 t ADT: 3,948

137TH PL

Good

Over: SPRING CK

10E & 4.5N STURGIS, Meade, SD

Built 2014 Load: 99.9 t ADT: 33

224 ST

Good

Over: BOXELDER CK

6.0 E BLACKHAWK, Meade, SD

Built 2004 Load: 99.9 t ADT: 35

SD042

Good

Over: LONG CK

0.6 E JCT SD 19 N, Minnehaha, SD

Built 1995 Load: 99.9 t ADT: 3,234

I029 SF

Good

Over: DRAINAGE DITCH

.1 W OF I29-26TH ST.INTER, Minnehaha, SD

Built 1996 Load: 99.9 t ADT: 8,300

Harmodon Rd/SD11

Good

Over: Drainage Ditch

0.3N of Lincoln Co Line, Minnehaha, SD

Built 2012 Load: 99.9 t ADT: 100

Harmodon Road

Good

Over: Drainage Channel

north of 57th Street, Minnehaha, SD

Built 2012 Load: 99.9 t ADT: 100

SD011

Good

Over: TRIB TO W PIPESTONE CK

5.9 N I 90 INTERCH, Minnehaha, SD

Built 2004 Load: 99.9 t ADT: 3,797

SD034

Good

Over: BROOKFIELD CK

1.5 E JCT SD 13, Moody, SD

Built 2010 Load: 99.9 t ADT: 1,552

SD044

Good

Over: CK

18.6 SE OF SCENIC, Pennington, SD

Built 1983 Load: 99.9 t ADT: 486

SD020

Good

Over: THUNDER BUTTE CK

4.1E PRAIRIE CITY, Perkins, SD

Built 2008 Load: 99.9 t ADT: 424

IRR SD010

Good

Over: CK

1.6 W OF SISSETON, Roberts, SD

Built 1997 Load: 99.9 t ADT: 2,520

127th Street

Good

Over: Creek

1.8W of Peever, Roberts, SD

Built 2017 Load: 99.9 t ADT: 254

465th Avenue

Good

Over: Creek

3.5S & 2W of Wilmot, Roberts, SD

Built 2007 Load: 99.9 t ADT: 31

SD015

Good

Over: NORTH FORK WHETSTONE RV

1.1 W JCT SD 123, Roberts, SD

Built 2021 Load: 99.9 t ADT: 666

471st Avenue

Good

Over: Creek

1.2N & 1W of Corona, Roberts, SD

Built 2017 Load: 99.9 t ADT: 20

229TH STREET

Good

Over: OVERFLOW SAND CK

5.8E & 1N Woonsocket, Sanborn, SD

Built 2014 Load: 99.9 t ADT: 56

162ND ST

Good

Over: Snake Creek

2.2N 0.1E ATHOL, Spink, SD

Built 2019 Load: 99.9 t ADT: 31

398TH AVE

Good

Over: CREEK

2E & 2.5S BRENTFORD, Spink, SD

Built 1935 Load: 99.9 t ADT: 50

SD028

Good

Over: BR SHUE CK

0.4 W CLARK CO LINE, Spink, SD

Built 2013 Load: 99.9 t ADT: 334

US014

Good

Over: WAGON HOUND CK

1.7 W OF HAYES, Stanley, SD

Built 2002 Load: 99.9 t ADT: 1,136

IRR COUNTY ROAD

Good

Over: ANTELOPE CK

2 S & 6.3 E OF MISSION, Todd, SD

Built 2020 Load: 99.9 t ADT: 27

297 AVE

Good

Over: OAK CK

0.8N CARTER, Tripp, SD

Built 2006 Load: 99.9 t ADT: 50

268 ST

Good

Over: COTTONWOOD CK

5.0N & 0.8W WITTEN, Tripp, SD

Built 2005 Load: 99.9 t ADT: 61

304 AVENUE

Good

Over: WILLOW CK

3W & 3.1N CLEARFIELD, Tripp, SD

Built 2018 Load: 99.9 t ADT: 55

278 STREET

Good

Over: EAST COTTONWOOD CK

11.9W & 1.0S WINNER, Tripp, SD

Built 2014 Load: 99.9 t ADT: 55

282 STREET

Good

Over: BIG HOLLOW CK

7W & 4S WINNER, Tripp, SD

Built 2007 Load: 99.9 t ADT: 40

313 AVENUE

Good

Over: DOG EAR CK

9E & 1.7N WITTEN, Tripp, SD

Built 2012 Load: 99.9 t ADT: 15

314 AVENUE

Good

Over: DOG EAR CK

10E & 0.6N WITTEN, Tripp, SD

Built 2011 Load: 99.9 t ADT: 50

278 STREET

Good

Over: CK

1.7E & 1S WINNER, Tripp, SD

Built 2012 Load: 99.9 t ADT: 50

327 AVENUE

Good

Over: PONCA CK

4E 2.3S COLOME, Tripp, SD

Built 2010 Load: 99.9 t ADT: 50

291ST STREET

Good

Over: TURKEY CK

8.8W VIBORG, Turner, SD

Built 2008 Load: 99.9 t ADT: 140

SD019

Good

Over: CK

4.3 S JCT US 18 WEST, Turner, SD

Built 1963 Load: 99.9 t ADT: 1,358

45770 275 ST

Good

Over: ELCE CK

4.7E PARKER, Turner, SD

Built 2014 Load: 99.9 t ADT: 743

I029

Good

Over: CK

5.2 N SD 48 INTERCH, Union, SD

Built 1961 Load: 99.9 t ADT: 11,970

US012

Good

Over: CK

0.4 S JCT SD 130 E, Walworth, SD

Built 1969 Load: 99.9 t ADT: 1,900

SD052

Good

Over: CK

5.2 S JCT SD 50, Yankton, SD

Built 2005 Load: 99.9 t ADT: 2,430

30810 437th Ave

Good

Over: Marne Creek

4.1 S & 2.0 E Utica, Yankton, SD

Built 2016 Load: 99.9 t ADT: 45

KELLEN GROSS DR

Good

Over: UNNAMED TRIB TO MARNE CK

KELLEN GROSS DR - YANKTON, Yankton, SD

Built 1993 Load: 99.9 t ADT: 500

Whiting Drive

Good

Over: Unnamed Creek

NE Edge of Yankton, Yankton, SD

Built 1997 Load: 99.9 t ADT: 1,440

446th Ave

Good

Over: Clay Creek

6W 1.2S Irene, Yankton, SD

Built 2008 Load: 99.9 t ADT: 20

44970 294st

Good

Over: Drainage Ditch

3 N & 2.3 W Irene, Yankton, SD

Built 2017 Load: 99.9 t ADT: 93

30720 451 AVE

Good

Over: Drainage Ditch

1.3 S Volin, Yankton, SD

Built 2016 Load: 99.9 t ADT: 655

IRR SD063

Good

Over: RUDY CK TRIBUTARY

9.4 S DEWEY CO LINE, Ziebach, SD

Built 1994 Load: 99.9 t ADT: 656

COUNTY RD

Poor

Over: CK

17.1S & 7.3E RELIANCE, Lyman, SD

Built 1950 ADT: 10

PARLE ST (GARY)

Poor

Over: W Br Lac qui Parle River

PARLE ST. GARY, Deuel, SD

Built 1950 Load: 2.7 t ADT: 50

113th Street

Poor

Over: Crow Creek

3S & 1.2W of Britton, Marshall, SD

Built 1935 Load: 2.7 t ADT: 35

405TH AVE

Poor

Over: FOSTER CREEK

1W & 3.2N BLOOMFIELD, Spink, SD

Built 1910 Load: 2.7 t ADT: 50

Showing 4,901-4,950 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.