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

US018

Good

Over: HURLEY CK

1.9 E JCT SD 19, Turner, SD

Built 2019 Load: 36.3 t ADT: 1,990

30630 473 AVE.

Good

Over: CK

1E & 8.3S BERESFORD, Union, SD

Built 1978 Load: 36.3 t ADT: 41

IRR SD044

Good

Over: PASS CK

5.2 E JCT SD 73, Jackson, SD

Built 1980 Load: 36.4 t ADT: 455

SD034

Good

Over: ELM CK

12 SW OF UNION CENTER, Meade, SD

Built 2012 Load: 36.4 t ADT: 847

478TH AVE, HWY 121

Good

Over: SLIP-UP CREEK

4E & 0.9S BALTIC, Minnehaha, SD

Built 2013 Load: 36.4 t ADT: 1,116

SD050 E

Good

Over: JAMES RV

6.2 E JCT US 81, Yankton, SD

Built 1985 Load: 36.4 t ADT: 2,763

44780 301st Street

Good

Over: Clay Creek

4.2W & 4.0S of Irene, Yankton, SD

Built 2020 Load: 36.4 t ADT: 50

US212

Good

Over: HORSE CK

0.3 N JCT SD 79 S, Butte, SD

Built 2005 Load: 36.5 t ADT: 2,418

IRR BIA RTE 4

Good

Over: FIRE STEEL CREEK

8 KM EAST OF HWY 65, Corson, SD

Built 1987 Load: 36.5 t ADT: 45

IRR BIA RTE 8

Good

Over: STOVE CREEK

7.1 KM SW OF US-212/BIA-8, Dewey, SD

Built 2013 Load: 36.5 t ADT: 110

IRR BIA RTE 1

Good

Over: BEAR IN THE LODGE CREEK

8 KM S 7.2 KM E INTERIOR, Jackson, SD

Built 1986 Load: 36.5 t ADT: 146

469th Avenue

Good

Over: Trib. to Saddle Creek

9.7S & 3E of Lennox, Lincoln, SD

Built 2016 Load: 36.5 t ADT: 135

US018

Good

Over: CK

2.0 W OF CANTON, Lincoln, SD

Built 1980 Load: 36.5 t ADT: 6,695

474th Avenue

Good

Over: N. Fork Whetstone Rv

2E & 1.4N of Corona, Roberts, SD

Built 2003 Load: 36.5 t ADT: 125

483RD AVENUE

Good

Over: CK

3.3N & 3W ELKTON, Brookings, SD

Built 2009 Load: 36.6 t ADT: 92

SD032

Good

Over: BIG SIOUX RV

1.7 W JCT SD 13, Moody, SD

Built 1977 Load: 36.6 t ADT: 3,322

458TH AVENUE

Good

Over: CK

2W & 0.2S DAVIS, Turner, SD

Built 2020 Load: 36.6 t ADT: 75

446th Avenue

Good

Over: Dolph Creek

4W & 0.2N of Lake Norden, Hamlin, SD

Built 2018 Load: 36.7 t ADT: 66

Yankton Trails Prk

Good

Over: Big Sioux River

north of 57th Street, Minnehaha, SD

Built 1993 Load: 36.7 t ADT: 50

NECK YOKE ROAD

Good

Over: SPRING CK

.1S .1E REPTILE GAR., Pennington, SD

Built 1973 Load: 36.7 t ADT: 3,365

SD044

Good

Over: VERMILLION RV

1.4 E JCT SD 19, Turner, SD

Built 1968 Load: 36.7 t ADT: 1,034

47910 299 ST

Good

Over: CK

2N & 0.1E ALCESTER, Union, SD

Built 2004 Load: 36.7 t ADT: 125

IRR AR SD044

Good

Over: CORN CK

0.6 W JCT SD 63, Mellette, SD

Built 1980 Load: 36.8 t ADT: 455

SD231

Good

Over: BOXELDER CK

0.8 S MEADE CO LINE, Pennington, SD

Built 1974 Load: 36.8 t ADT: 9,148

410th Avenue

Good

Over: Middle Pearl Creek

1E & 5.8S of Cavour, Beadle, SD

Built 2019 Load: 36.9 t ADT: 171

133rd Street

Good

Over: Mina Lake

1.5W of Brown Co. Line, Edmunds, SD

Built 2008 Load: 36.9 t ADT: 200

SD044

Good

Over: PONY CK

0.2 W JCT SD 37, Hutchinson, SD

Built 1959 Load: 36.9 t ADT: 1,598

US083

Good

Over: ANTELOPE CK

0.5 S STANLEY CO LINE, Lyman, SD

Built 2004 Load: 36.9 t ADT: 2,470

NEW UNDERWOOD RD.

Good

Over: ELK CK

3.2 N PENN. CO LN, Meade, SD

Built 1992 Load: 36.9 t ADT: 162

SD115

Good

Over: CK

0.1 W OF DELL RAPIDS, Minnehaha, SD

Built 2018 Load: 36.9 t ADT: 3,668

I229 S

Good

Over: BIG SIOUX RV

0.4 N RICE ST INTERCH, Minnehaha, SD

Built 2000 Load: 36.9 t ADT: 14,390

151ST ST

Good

Over: MUD CREEK

3.0N 1.5W BRENTFORD, Spink, SD

Built 2020 Load: 36.9 t ADT: 26

IRR BIA RTE 5

Good

Over: LITTLE WHITE RIVER

16 KM NE OF SPRING CREEK, Todd, SD

Built 2016 Load: 36.9 t ADT: 1,096

149 STREET

Good

Over: BIG SIOUX RV

2.5S & 12.2W MARVIN, Grant, SD

Built 2023 Load: 37.0 t ADT: 250

27020 415 AVE.

Good

Over: SOUTH FORK TWELVE MILE C

4.2E & 0.7S DIMOCK, Hutchinson, SD

Built 1994 Load: 37.0 t ADT: 69

396TH AVE

Good

Over: CREEK

5.1 S FRANKFORT, Spink, SD

Built 1972 Load: 37.0 t ADT: 70

355TH AVE

Good

Over: SOUTH FORK SNAKE CK

2E & 0.2N FAULKTON, Faulk, SD

Built 2010 Load: 37.1 t ADT: 136

I029 S

Good

Over: BURLINGTON NORTHERN RR

0.8 N I 90 INTERCH, Minnehaha, SD

Built 2000 Load: 37.1 t ADT: 11,285

I029 N

Good

Over: BURLINGTON NORTHERN RR

0.8 N I 90 INTERCH, Minnehaha, SD

Built 1999 Load: 37.1 t ADT: 11,285

SD115

Good

Over: BIG SIOUX RV

0.2 S OF DELL RAPIDS, Minnehaha, SD

Built 2018 Load: 37.1 t ADT: 3,668

SD073

Good

Over: THUNDER BUTTE CK

4.7 S JCT SD 20 E, Perkins, SD

Built 2005 Load: 37.1 t ADT: 450

43780 Beaver Lake

Good

Over: Beaver Creek

2.8E & 1.8N of Utica, Yankton, SD

Built 2013 Load: 37.1 t ADT: 60

IRR BIA RTE 11

Good

Over: CHERRY CREEK

1 KM WEST OF CHERRY CREEK, Ziebach, SD

Built 1968 Load: 37.1 t ADT: 250

218th Street

Good

Over: Creek

13.0S & 5.5W of Wolsey, Beadle, SD

Built 2017 Load: 37.2 t ADT: 66

452 AVENUE

Good

Over: BIG SIOUX RV

2S & 12.5W MARVIN, Grant, SD

Built 2023 Load: 37.2 t ADT: 25

479 AVENUE

Good

Over: SOUTH FORK YELLOW BANK R

3W & 1.2S ALBEE, Grant, SD

Built 2016 Load: 37.2 t ADT: 21

481 AVENUE

Good

Over: SOUTH FORK WHETSTONE RV

2.5E & 1.8N MILBANK, Grant, SD

Built 2021 Load: 37.2 t ADT: 49

229 ST

Good

Over: ROCK CK

7S & 2.6E CARTHAGE, Miner, SD

Built 2020 Load: 37.2 t ADT: 35

MAJOR LAKE ROAD

Good

Over: MAJOR LAKE SPILLWAY

MAJOR LK RD - HILL CITY, Pennington, SD

Built 2021 Load: 37.2 t ADT: 917

DATE ROAD

Good

Over: RABBIT CK

11W 8.5S BISON, Perkins, SD

Built 2002 Load: 37.2 t ADT: 86

Showing 4,051-4,100 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.