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

293rd Avenue

Good

Over: Creek

11W & 10.5N of Presho, Lyman, SD

Built 2018 Load: 31.8 t ADT: 24

IRR US018

Good

Over: WOUNDED KNEE CK

4.8 W JCT SD 391, Oglala Lakota, SD

Built 2017 Load: 31.8 t ADT: 1,222

BAD RIVER RD

Good

Over: PLUM CK

4 SW WENDTE, Stanley, SD

Built 1983 Load: 31.8 t ADT: 71

US018

Good

Over: CK

4.8 E JCT SD 19, Turner, SD

Built 2018 Load: 31.8 t ADT: 2,058

SD050

Good

Over: CK

0.5 E I 29 INTERCH, Union, SD

Built 2017 Load: 31.8 t ADT: 1,212

30690 451 Ave

Good

Over: Clay Ditch Creek

1 S Volin, Yankton, SD

Built 2019 Load: 31.8 t ADT: 655

I090 WF (392 AVE)

Good

Over: CK

4 E I90 & US 281 INTERCH, Aurora, SD

Built 1965 Load: 31.9 t ADT: 38

217th Street

Good

Over: James River

4.1E & 9S of Huron, Beadle, SD

Built 1991 Load: 31.9 t ADT: 56

29910 FROGCREEK RD

Good

Over: FROG CK

2.1S & 7E IRENE, Clay, SD

Built 1965 Load: 31.9 t ADT: 94

SD044

Good

Over: DRY CK

9.1 E JCT SD 37, Hutchinson, SD

Built 1964 Load: 31.9 t ADT: 1,592

SD034

Good

Over: MORRIS CK

3.4 E JCT US 281, Jerauld, SD

Built 1963 Load: 31.9 t ADT: 960

476th Avenue

Good

Over: Saddle Creek

4W & 6.9S of Canton, Lincoln, SD

Built 2015 Load: 31.9 t ADT: 94

SD231, SER RD

Good

Over: BLACKHAWK CK

1.0 N PENNINGTON CO LINE, Meade, SD

Built 1957 Load: 31.9 t ADT: 7,310

SD036EF (CORD #11)

Good

Over: GRACE COOLIDGE CK

4 MI S. & 5.3 W. HERMOSA, Custer, SD

Built 2001 Load: 32.0 t ADT: 570

US014A

Good

Over: BOULDER CK

3.2 NE JCT 85/14A, Lawrence, SD

Built 1999 Load: 32.0 t ADT: 5,676

WICKSVILLE RD

Good

Over: ELK CK

4.5 S 3 W ELM SPRING, Meade, SD

Built 2005 Load: 32.0 t ADT: 30

IRR SD034

Good

Over: CAMPBELL CK

2.8 W JCT SD 50 S, Buffalo, SD

Built 2016 Load: 32.1 t ADT: 566

SD044

Good

Over: CHOTEAU CK

3.5 E JCT US 281 S, Douglas, SD

Built 1961 Load: 32.1 t ADT: 1,721

290th Street

Good

Over: Harem Creek

11S & 3.8E of Lennox, Lincoln, SD

Built 2002 Load: 32.1 t ADT: 60

245th Street

Good

Over: W. Fork of Vermillion Rv

7N & 3.3W of Salem, McCook, SD

Built 2019 Load: 32.1 t ADT: 24

29710 445th Avenue

Good

Over: Clay Creek

0.1S & 7W of Irene, Yankton, SD

Built 2019 Load: 32.1 t ADT: 33

IRR BIA RTE 7

Good

Over: SWIFTBIRD CREEK

6.9KM N OF JUNCTION 212/7, Dewey, SD

Built 2004 Load: 32.2 t ADT: 74

227 ST

Good

Over: ROCK CK

6N & 6.3W HOWARD, Miner, SD

Built 1993 Load: 32.2 t ADT: 30

I029 NF

Good

Over: CK

1.9 E OF CROOKS, Minnehaha, SD

Built 1963 Load: 32.2 t ADT: 193

459 Ave Frog Ck Rd

Good

Over: FROG CK

2.8S & 7E IRENE, Clay, SD

Built 1965 Load: 32.3 t ADT: 94

357TH AVE

Good

Over: SOUTH FORK SNAKE CK

4E & 0.3N FAULKTON, Faulk, SD

Built 1999 Load: 32.3 t ADT: 65

GILBERT HETT RD

Good

Over: TRIB. TO GRAND RIVER

7.1W & 5.5S BUFFALO, Harding, SD

Built 2008 Load: 32.3 t ADT: 25

318 AVENUE

Good

Over: S FORK MEDICINE KNOLL CK

3.0 W & 0.6 S HARROLD, Hughes, SD

Built 2008 Load: 32.3 t ADT: 150

US018

Good

Over: LONETREE CK

1.6 E JCT SD 25, Hutchinson, SD

Built 2010 Load: 32.3 t ADT: 707

SD019

Good

Over: PARK CK

4 SE JCT SD 34, Lake, SD

Built 2014 Load: 32.3 t ADT: 2,773

461st Street

Good

Over: Little Minnesota River

3E of Sisseton, Roberts, SD

Built 2000 Load: 32.3 t ADT: 15

IRR BIA RTE 13

Good

Over: CHERRY CREEK

4 KM SE RED SCAFFOLD, Ziebach, SD

Built 1987 Load: 32.3 t ADT: 80

FRUITDALE RD

Good

Over: BELLE FOURCHE RV

0.5S FRUITDALE, Butte, SD

Built 1995 Load: 32.4 t ADT: 47

SD015

Good

Over: TRIB N FORK YELLOW BANK

2.8 S JCT US 12, Grant, SD

Built 2022 Load: 32.4 t ADT: 1,961

Deadman Creek Road

Good

Over: DEADMANS CK

7.3 N & 9 W PHILIP, Haakon, SD

Built 1955 Load: 32.4 t ADT: 53

SD044

Good

Over: PONY CK

1.2 W JCT SD 37, Hutchinson, SD

Built 1959 Load: 32.4 t ADT: 1,598

261st Street

Good

Over: Wolf Creek

1.6E of Emery, McCook, SD

Built 2012 Load: 32.4 t ADT: 225

IRR BIA RTE 36

Good

Over: WHITE CLAY CREEK

0.3KM E OF OGLALA SCHOOL, Oglala Lakota, SD

Built 2001 Load: 32.4 t ADT: 7,551

HORSE CR. (T-361)

Good

Over: SLATE CR AT DAM

T 1 N R 4 E SEC 15, Pennington, SD

Built 1935 Load: 32.4 t ADT: 50

SD075

Good

Over: LITTLE NASTY CK

11.6 N JCT SD 20, Perkins, SD

Built 2020 Load: 32.4 t ADT: 209

41310 295th Street

Good

Over: Emanuel Creek

8N & 2.8W of Tyndall, Bon Homme, SD

Built 2021 Load: 32.5 t ADT: 60

COUNTY RD

Good

Over: ANGOSTURA MAIN CANAL

2S & 2W ORAL, Fall River, SD

Built 1978 Load: 32.5 t ADT: 241

44950 282 ST

Good

Over: CK

8S & 2.5E MARION, Turner, SD

Built 2014 Load: 32.5 t ADT: 104

30300 475TH AVE

Good

Over: EAST BRULE CK

4W & 2S ALCESTER, Union, SD

Built 2017 Load: 32.5 t ADT: 280

IRR BIA RTE ALLEN

Good

Over: TRIB OF WHITE RIVER

EAST OF ALLEN, Bennett, SD

Built 2017 Load: 32.6 t ADT: 300

IRR BIA RTE 21

Good

Over: ROCK CREEK

IN BULLHEAD SOUTH DAKOTA, Corson, SD

Built 1971 Load: 32.6 t ADT: 203

366 AVE

Good

Over: CK

3.5E & 0.3S ST LAWRENCE, Hand, SD

Built 2006 Load: 32.6 t ADT: 43

West 12th Street

Good

Over: Ellis & Eastern Railroad

west of Grange Avenue -SF, Minnehaha, SD

Built 2016 Load: 32.6 t ADT: 22,694

IRR BIA ROUTE 32

Good

Over: WHITE RIVER

108 KM E OF BIA 41, Oglala Lakota, SD

Built 2012 Load: 32.6 t ADT: 500

IRR BIA RTE N

Good

Over: TRIB OF MEDICINE ROOT CK

10.8 KM N OF SH 2, Oglala Lakota, SD

Built 2013 Load: 32.6 t ADT: 100

Showing 3,751-3,800 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.