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

SANBORN ST (SD37)

Good

Over: DRY RUN CK

0.3N JCTI90 LOOP MITCHELL, Davison, SD

Built 2001 Load: 89.8 t ADT: 13,545

39520 272 ST

Good

Over: CHOTEAU CK

1N & 6.2E CORSICA, Douglas, SD

Built 1994 Load: 89.8 t ADT: 77

28240 398 AVE

Good

Over: CK

1.8S,6.0E OF ARMOUR, Douglas, SD

Built 2003 Load: 89.8 t ADT: 35

COUNTY RD

Good

Over: LONE WELL CK

4W OELRICHS, Fall River, SD

Built 2000 Load: 89.8 t ADT: 85

OLD HIGHWAY 79

Good

Over: LONE WELL CK

3.5W OELRICHS, Fall River, SD

Built 2000 Load: 89.8 t ADT: 75

COUNTY RD

Good

Over: LONE WELL CK

1.2W & 0.3S OELRICHS, Fall River, SD

Built 2002 Load: 89.8 t ADT: 75

26370 413 AVENUE

Good

Over: TWELVE MILE CK

8W & 6.7S ALEXANDRIA, Hanson, SD

Built 2003 Load: 89.8 t ADT: 60

SORUM RD

Good

Over: POINT CK

6.0S 0.7E REVA, Harding, SD

Built 2006 Load: 89.8 t ADT: 9

328 AVE

Good

Over: SOUTH CHAPELLE CK

11.3S HOLABIRD, Hyde, SD

Built 2006 Load: 89.8 t ADT: 53

340 AVE

Good

Over: LAKE MITCHELL TRIBUTARY

3E AND 9.8N HIGHMORE, Hyde, SD

Built 2004 Load: 89.8 t ADT: 60

IRR BIA RTE 1

Good

Over: BEAR IN THE LODGE CREEK

0.5 KM N OF HISLE, Jackson, SD

Built 1999 Load: 89.8 t ADT: 133

SAINT JOE ST

Good

Over: CHIPMUNK GULCH

ST JOE ST SPEARFISH, Lawrence, SD

Built 1999 Load: 89.8 t ADT: 150

BEAR BUTTE RD.

Good

Over: SPRING CK

3.5N & 1E STURGIS, Meade, SD

Built 2001 Load: 89.8 t ADT: 80

BEAR BUTTE RD.

Good

Over: SOUTH CANAL

2E & 11.9N OF STURGIS, Meade, SD

Built 2000 Load: 89.8 t ADT: 25

194TH ST.

Good

Over: SOUTH CANAL

12N & 3.4E STURGIS, Meade, SD

Built 1995 Load: 89.8 t ADT: 30

NINE MILE RD

Good

Over: NINE MILE CK

8.0E & 9.5N STURGIS, Meade, SD

Built 2005 Load: 89.8 t ADT: 88

RICARD RD.

Good

Over: CK

11.7E&8.3S STURGIS, Meade, SD

Built 2000 Load: 89.8 t ADT: 41

N. Marion Road

Good

Over: Trib. to Skunk Creek

0.15N of Maple Street-SF, Minnehaha, SD

Built 2014 Load: 89.8 t ADT: 4,400

COUNTY RD #7

Good

Over: LODGEPOLE CK

3.0W & 15.1N BISON, Perkins, SD

Built 2004 Load: 89.8 t ADT: 20

224TH STREET

Good

Over: SAND CK

2.9E & 6N WOONSOCKET, Sanborn, SD

Built 2001 Load: 89.8 t ADT: 56

30950 439th Ave

Good

Over: Marne Creek

1.0W of Yankton, Yankton, SD

Built 2002 Load: 89.8 t ADT: 33

29540 444th Ave

Good

Over: Clay Creek

1.8 N Mayfield, Yankton, SD

Built 2012 Load: 89.8 t ADT: 162

CAMP CROOK RD

Good

Over: TRIB TO NORTH INDIAN CK

7.3 N JCT US 85, Butte, SD

Built 2011 Load: 90.6 t ADT: 124

CAMP CROOK RD

Good

Over: CK

4.2 N JCT US 85, Butte, SD

Built 2011 Load: 90.6 t ADT: 40

HARDING CUTOFF RD

Good

Over: ALKALI CK

35.5 N 4.5 E B.F., Butte, SD

Built 2016 Load: 90.6 t ADT: 47

HARMON DRIVE

Good

Over: LAKE MITCHELL LK

NW EDGE LK MITCHELL, Davison, SD

Built 2015 Load: 90.6 t ADT: 640

COUNTY RD

Good

Over: STICK CK

5.9N & 21.0W BUFFALO, Harding, SD

Built 2015 Load: 90.6 t ADT: 64

FAS 3214 280 AVE

Good

Over: PLUM CK

0.5E & 1.3S OF FT PIERRE, Stanley, SD

Built 1990 Load: 90.6 t ADT: 210

340TH AVENUE

Good

Over: WOLF CK

3E AND 7.6N HIGHMORE, Hyde, SD

Built 2020 Load: 90.7 t ADT: 60

SD079

Good

Over: LAME JOHNNY CK

9.6 N FALL RIVER CO LINE, Custer, SD

Built 2004 Load: 90.8 t ADT: 3,672

I029

Good

Over: CK

4.5 N SD 48 INTERCH, Union, SD

Built 1961 Load: 90.9 t ADT: 11,970

US385

Good

Over: WEST STRAWBERRY CK

0.6 S OF PLUMA, Lawrence, SD

Built 2002 Load: 91.2 t ADT: 2,566

I090

Good

Over: CK

0.9 NW TILFORD INTERCH, Meade, SD

Built 1956 Load: 92.1 t ADT: 18,420

SD034

Good

Over: ROCK CK

9.8 E SANBORN CO LINE, Miner, SD

Built 1986 Load: 93.9 t ADT: 1,198

SD046

Good

Over: CLAY CK

4.7 E JCT US 81, Yankton, SD

Built 2023 Load: 94.0 t ADT: 1,526

SD1804

Good

Over: COW CK

0.4 N HUGHES CO LINE, Sully, SD

Built 2007 Load: 95.1 t ADT: 634

US018

Good

Over: TRIB LITTLE WHITE RV

0.5W Todd Co Border US18, Bennett, SD

Built 2020 Load: 95.5 t ADT: 573

SD046

Good

Over: TURKEY CK

1.9 W TURNER-CLAY LINE, Yankton, SD

Built 2023 Load: 95.6 t ADT: 2,311

SD020

Good

Over: SUMNER SLOUGH

1 MI S. & 1 E. FLORENCE, Codington, SD

Built 2003 Load: 96.7 t ADT: 1,861

SD011

Good

Over: CK

6.8 N I 90 INTERCH, Minnehaha, SD

Built 2005 Load: 97.3 t ADT: 3,286

US016

Good

Over: LIGHTNING CK

7.8 W JCT US 385 S, Custer, SD

Built 1988 Load: 98.3 t ADT: 1,429

463rd Avenue

Good

Over: Tributary

4.3W & 1S of Wilmot, Roberts, SD

Built 2005 Load: 98.8 t ADT: 30

I090

Good

Over: BLACKHAWK CK

0.9 NW PENN CO LINE, Meade, SD

Built 2008 Load: 99.0 t ADT: 11,025

SD046

Good

Over: BLIND CK

0.7E JCT SD 19 S, Clay, SD

Built 2020 Load: 99.6 t ADT: 3,303

US212

Good

Over: OWL CK

2.3 W JCT SD 79, Butte, SD

Built 2020 Load: 99.7 t ADT: 1,282

I090 WB OFF RAMP

Good

Over: BLACKHAWK CK

1.0 NW PENN CO LINE, Meade, SD

Built 2008 Load: 99.7 t ADT: 2,993

IRR US018

Good

Over: CHEYENNE CK

2.0 N OF PINE RIDGE, Oglala Lakota, SD

Built 2020 Load: 99.7 t ADT: 3,442

US281

Good

Over: CK

0.2 S OF I90 INTERCHANGE, Aurora, SD

Built 2007 Load: 99.9 t ADT: 1,514

112th Street

Good

Over: Willow Creek

10.8W & 2.0N of Barnard, Brown, SD

Built 2006 Load: 99.9 t ADT: 98

138th Street

Good

Over: Mud Creek

4N & 1.7W of Ferney, Brown, SD

Built 2012 Load: 99.9 t ADT: 56

Showing 4,801-4,850 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.