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 E

Unknown

Over: VANOCKER CANY, RCP&E RR

0.1 NW STRGS INTERCHANGE, Meade, SD

Built 2006 ADT: 7,729

I090 W

Unknown

Over: JUNCTION AVE - STURGIS

STURGIS INTERCHANGE, Meade, SD

Built 2005 ADT: 6,446

I090 E

Unknown

Over: JUNCTION AVE - STURGIS

STURGIS INTERCHANGE, Meade, SD

Built 2006 ADT: 6,446

I090 W

Unknown

Over: I090 WF & BH NAT CEM RD

BH NATL CEM INTERCHANGE, Meade, SD

Built 1963 ADT: 1,084

I090 E

Unknown

Over: I090 EF & BH NAT CEM RD

BH NATL CEM INTERCHANGE, Meade, SD

Built 1963 ADT: 1,084

PLEASANT VALLEY RD

Unknown

Over: I090

3.2NW TILFORD INTERCHANGE, Meade, SD

Built 2023 ADT: 18,520

TILFORD RD

Unknown

Over: I090

TILFORD INTERCHANGE, Meade, SD

Built 1964 ADT: 18,420

I090 W

Unknown

Over: CHIMNEY CANYON RD

N PIEDMONT INTERCHANGE, Meade, SD

Built 2017 ADT: 1,010

I090 E

Unknown

Over: CHIMNEY CANYON RD

N PIEDMONT INTERCHANGE, Meade, SD

Built 2018 ADT: 1,010

ELK CK RD (FAS)

Unknown

Over: I090

S PIEDMONT INTERCHANGE, Meade, SD

Built 1957 ADT: 19,590

STAGE STOP RD

Unknown

Over: I090

3.1 NW SD 231 INTERCHANGE, Meade, SD

Built 1980 ADT: 20,060

SD 231

Unknown

Over: I090

1.0 MILE NW PENN CO LINE, Meade, SD

Built 2008 ADT: 22,050

I090 W

Unknown

Over: SD019

SD 19 INTERCHANGE, Minnehaha, SD

Built 2023 ADT: 2,195

I090 E

Unknown

Over: SD019

SD 19 INTERCHANGE, Minnehaha, SD

Built 1964 ADT: 916

457 AVE

Unknown

Over: I090

1.2 E SD 19 INTERCH, Minnehaha, SD

Built 1963 ADT: 11,940

459 AVE

Unknown

Over: I090

3.8 E SD 19 INTERCH, Minnehaha, SD

Built 1963 ADT: 11,940

461 AVE

Unknown

Over: I090

4.8 W SD 38 INTERCH, Minnehaha, SD

Built 1963 ADT: 11,940

463 AVE (FAS 6353)

Unknown

Over: I090

2.8 W SD 38 INTERCHANGE, Minnehaha, SD

Built 1963 ADT: 11,940

I090 W

Unknown

Over: SD038

SD 38 & I 90 INTERCHANGE, Minnehaha, SD

Built 1989 ADT: 3,892

I090 E

Unknown

Over: SD038

SD 38 & I 90 INTERCHANGE, Minnehaha, SD

Built 1989 ADT: 3,892

I090 W

Unknown

Over: 468 AVE, DRAINAGE

2.2 E SD 38 INTERCH, Minnehaha, SD

Built 1961 ADT: 500

I090 E

Unknown

Over: 468 AVE, DRAINAGE

2.2 E SD 38 INTERCH, Minnehaha, SD

Built 1961 ADT: 500

470 AVE

Unknown

Over: I090

2.1 W I 29 INTERCH, Minnehaha, SD

Built 1961 ADT: 13,750

N MARION RD

Unknown

Over: I090

1.1 W I 29 INTERCH, Minnehaha, SD

Built 2010 ADT: 13,750

W 57TH ST

Unknown

Over: I029

INTERSECTION 57TH & I029, Minnehaha, SD

Built 2001 ADT: 46,060

W 49TH ST

Unknown

Over: I029

0.5 SW 41ST INTERCH, Minnehaha, SD

Built 1981 ADT: 46,060

I029 S

Unknown

Over: 245 ST

1 N SD 115 INTERCH, Minnehaha, SD

Built 1963 ADT: 85

SD115

Unknown

Over: I029

SD 115 & I29 INTERCHANGE, Minnehaha, SD

Built 2017 ADT: 15,650

248 ST

Unknown

Over: I029

2 S SD 115 INTERCH, Minnehaha, SD

Built 1963 ADT: 19,660

I029 S

Unknown

Over: 250 ST

BALTIC INTERCHANGE, Minnehaha, SD

Built 1963 ADT: 1,738

I029 S

Unknown

Over: 254 ST (FAS 6148)

6.3 N I 90 INTERCH, Minnehaha, SD

Built 1963 ADT: 75

I029 S

Unknown

Over: W 12TH ST

12TH ST INTERCHANGE, Minnehaha, SD

Built 2006 ADT: 37,270

26TH ST

Unknown

Over: I029

26TH ST INTERCHANGE, Minnehaha, SD

Built 1996 ADT: 44,050

41ST ST

Unknown

Over: I029

41ST INTERCHANGE, Minnehaha, SD

Built 1979 ADT: 46,060

I029 N

Unknown

Over: 245 ST

1 N SD 115 INTERCH, Minnehaha, SD

Built 1963 ADT: 85

I029 N

Unknown

Over: 250 ST

BALTIC INTERCHANGE, Minnehaha, SD

Built 1963 ADT: 1,738

I029 N

Unknown

Over: 254 ST (FAS 6148)

6.3 N I 90 INTERCH, Minnehaha, SD

Built 1963 ADT: 75

I029 N

Unknown

Over: W 12TH ST

12TH ST INTERCHANGE, Minnehaha, SD

Built 2006 ADT: 37,270

257 ST

Unknown

Over: I029

3.3 N I 90 INTERCH, Minnehaha, SD

Built 1963 ADT: 19,910

PEDESTRIAN BR

Unknown

Over: I029

0.6 S OF RUSSELL ST, Minnehaha, SD

Built 2003 ADT: 45,020

I029 S

Unknown

Over: W MADISON ST

MADISON ST INTERCHANGE, Minnehaha, SD

Built 2004 ADT: 5,800

W MAPLE ST

Unknown

Over: I029

RUSSEL STR INTERCH, Minnehaha, SD

Built 2002 ADT: 45,020

I029 N

Unknown

Over: W MADISON ST

MADISON ST INTERCHANGE, Minnehaha, SD

Built 2004 ADT: 5,800

W MAPLE ST

Unknown

Over: RAMP A-RUSSELL STR INTCH

.1 E OF RUSSELL STR INTCH, Minnehaha, SD

Built 2003 ADT: 2,847

258 ST (FAS 6364)

Unknown

Over: I029

2.2 N I 90 INTERCHANGE, Minnehaha, SD

Built 1962 ADT: 22,160

I090 W

Unknown

Over: I029, DRAINAGE DITCH

I 90 & I 29 INTERCHANGE, Minnehaha, SD

Built 1961 ADT: 22,160

I090 E

Unknown

Over: I029, DRAINAGE DITCH

I 90 & I 29 INTERCHANGE, Minnehaha, SD

Built 1961 ADT: 33,050

W 60TH ST N

Unknown

Over: I029

W 60TH ST N INTERCHANGE, Minnehaha, SD

Built 1996 ADT: 33,050

I029 S

Unknown

Over: W BENSON RD

BENSON RD INTERCHANGE, Minnehaha, SD

Built 2003 ADT: 700

I029 N

Unknown

Over: W BENSON RD

BENSON RD INTERCHANGE, Minnehaha, SD

Built 2002 ADT: 700

Showing 251-300 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.