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

IRR SD034

Good

Over: ELM CK

8.2 W JCT SD 45, Buffalo, SD

Built 1990 Load: 38.5 t ADT: 468

IRR SD050

Good

Over: TRIB CHOTEAU CK

0.4 N JCT SD46, Charles Mix, SD

Built 2020 Load: 38.5 t ADT: 1,329

IRR BIA RTE 44

Good

Over: OAK CREEK

7.2 KM SE OF MAHTO, Corson, SD

Built 2010 Load: 38.5 t ADT: 100

193RD ST

Good

Over: REE CK

6.4N & 1.4W VAYLAND, Hand, SD

Built 2010 Load: 38.5 t ADT: 43

287th Street

Good

Over: Snake Creek

8S & 1.6E of Lennox, Lincoln, SD

Built 2019 Load: 38.5 t ADT: 57

225 ST

Good

Over: ROCK CK

3S & 2.4E CARTHAGE, Miner, SD

Built 1990 Load: 38.5 t ADT: 35

258TH ST, HWY 130

Good

Over: SILVER CK

0.2E RENNER, Minnehaha, SD

Built 2017 Load: 38.5 t ADT: 2,292

257TH STREET

Good

Over: SLIP-UP CREEK

3.1E & 7S BALTIC, Minnehaha, SD

Built 2019 Load: 38.5 t ADT: 32

446A Avenue

Good

Over: Blue Dog Lake

1.5E & 0.5N of Waubay, Day, SD

Built 2023 Load: 38.6 t ADT: 852

SD044 WF

Good

Over: RAPID CK

7.4 SE JCT US 385, Pennington, SD

Built 1958 Load: 38.6 t ADT: 50

185 ST

Good

Over: MEDICINE KNOLL CK

14.8E ONIDA, Sully, SD

Built 2005 Load: 38.6 t ADT: 25

45290 280 ST

Good

Over: CK

5S & 0.4W PARKER, Turner, SD

Built 2016 Load: 38.6 t ADT: 385

47605 310TH ST

Good

Over: CK

12S & 4.1E BERESFORD, Union, SD

Built 2020 Load: 38.6 t ADT: 30

US016

Good

Over: SPRING CK

0.3E & 0.3N HILL CITY, Pennington, SD

Built 1995 Load: 38.8 t ADT: 6,642

157 AVENUE

Good

Over: RABBIT CK

1.2E & 0.8S SORUM, Perkins, SD

Built 1994 Load: 38.8 t ADT: 55

SD019

Good

Over: BNSF RR

0.6 W JCT SD 19 N/SD 50L, Clay, SD

Built 1997 Load: 38.9 t ADT: 2,342

US212

Good

Over: BIG SIOUX RV

0.7 W JCT US 81, Codington, SD

Built 2019 Load: 38.9 t ADT: 14,449

SD034

Good

Over: SPRING CK

9.4 NE JCT SD 79 N, Meade, SD

Built 2014 Load: 38.9 t ADT: 818

SD1806EF

Good

Over: DIVERSION CHANNEL

2.0 N FORT PIERRE, Stanley, SD

Built 1998 Load: 38.9 t ADT: 50

38630 291st Street

Good

Over: Lake Andes Lake

1.0N & 4.3E Lake Andes, Charles Mix, SD

Built 2007 Load: 39.0 t ADT: 100

38840 288th Street

Good

Over: Lake Andes Lake

4.0N & 6.4E Lake Andes, Charles Mix, SD

Built 2007 Load: 39.0 t ADT: 100

480 AVENUE

Good

Over: CK

2W & 1.3N ALBEE, Grant, SD

Built 2023 Load: 39.0 t ADT: 327

487 AVENUE

Good

Over: CK

4E & 2.1N ALBEE, Grant, SD

Built 2014 Load: 39.0 t ADT: 98

IRR SD044

Good

Over: LOST DOG CK

4.4 SE OF INTERIOR, Jackson, SD

Built 2012 Load: 39.0 t ADT: 571

US014A

Good

Over: SPEARFISH CK

4.8 N CHEYENNE XING, Lawrence, SD

Built 2003 Load: 39.0 t ADT: 830

KILLDEER RD.

Good

Over: SULPHUR CK

9 S 2 W MUD BUTTE, Meade, SD

Built 1999 Load: 39.0 t ADT: 15

264TH STREET

Good

Over: BEAVER CREEK

2S & 3.7W VALLEY SPRINGS, Minnehaha, SD

Built 2018 Load: 39.1 t ADT: 63

464TH AVENUE

Good

Over: MEADOW CK

0.9S Volga, Brookings, SD

Built 2021 Load: 39.2 t ADT: 720

FDR 345

Good

Over: IRON CREEK

T 2 S R 6 E SEC 30, Custer, SD

Built 1957 Load: 39.2 t ADT: 25

192nd Street

Good

Over: Big Sioux River

2N & 2.3W of Estelline, Hamlin, SD

Built 2001 Load: 39.2 t ADT: 40

208 STREET

Good

Over: BREKKE DRAW

1.4 W 0.3 S CANNING, Hughes, SD

Built 1967 Load: 39.2 t ADT: 57

130th Street

Good

Over: Jorgenson River

1E & 3S of Peever, Roberts, SD

Built 1992 Load: 39.2 t ADT: 34

310th Avenue

Good

Over: Tributary to Swan Creek

0.7N of Lowry, Walworth, SD

Built 1991 Load: 39.2 t ADT: 41

IRR BIA RTE 6

Good

Over: BEAR IN THE LODGE CREEK

1 KM N OF HISLE, Jackson, SD

Built 1999 Load: 39.3 t ADT: 100

264TH STREET

Good

Over: SPLIT ROCK CREEK

2.5S & 0.9W BRANDON, Minnehaha, SD

Built 1992 Load: 39.3 t ADT: 135

SD1806

Good

Over: ANTELOPE CK

11.2 SE JCT US 83, Stanley, SD

Built 1981 Load: 39.3 t ADT: 199

406TH AVENUE

Good

Over: TRIB ENEMY CK

2W 6.3S MITCHELL, Davison, SD

Built 2020 Load: 39.4 t ADT: 114

SHERIDAN LAKE ROAD

Good

Over: SPRING CK

2.IN & 2.6W ROCKERVILLE, Pennington, SD

Built 1974 Load: 39.4 t ADT: 933

SHERIDAN LAKE ROAD

Good

Over: SPRING CK

2.IN,2.6WROCKERVILLE, Pennington, SD

Built 1974 Load: 39.4 t ADT: 933

SHERIDAN LAKE ROAD

Good

Over: SPRING CK

2.1N & 2.3W ROCKERVILLE, Pennington, SD

Built 1974 Load: 39.4 t ADT: 747

SD038

Good

Over: FIRESTEEL CK

0.3 W HANSON CO LINE, Davison, SD

Built 1988 Load: 39.5 t ADT: 2,279

RICARD RD.

Good

Over: ELK CK

12E & 12.5S OF STURGIS, Meade, SD

Built 2000 Load: 39.5 t ADT: 33

SD115

Good

Over: SOUTH FORK SIOUX RV

0.5 S OF DELL RAPIDS, Minnehaha, SD

Built 2016 Load: 39.5 t ADT: 3,668

IRR SD127

Good

Over: CK

5.2 E JCT SD 106, Roberts, SD

Built 2023 Load: 39.5 t ADT: 669

310 AVENUE

Good

Over: KEYAPAHA RV

.1E & 1N MILLBORO, Tripp, SD

Built 2017 Load: 39.5 t ADT: 50

BURLEIGH STREET

Good

Over: MARNE CREEK

BURLEIGH STREET - YANKTON, Yankton, SD

Built 1989 Load: 39.5 t ADT: 4,996

247TH STREET

Good

Over: FIRESTEEL CK

7N & 14.2 W MITCHELL, Davison, SD

Built 2011 Load: 39.6 t ADT: 149

SD015

Good

Over: CK

0.5 N JCT SD 20, Grant, SD

Built 2022 Load: 39.6 t ADT: 1,643

GRAPEVINE RD.

Good

Over: BEAVER CK

14S & 15.3W FAITH, Meade, SD

Built 2002 Load: 39.6 t ADT: 20

160TH AVE

Good

Over: RAPID CK

1.2E 1.3S FARMINGDAL, Pennington, SD

Built 1999 Load: 39.6 t ADT: 120

Showing 4,151-4,200 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.