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

ALKALI RD.

Fair

Over: BELLE FOURCHE RV

3 W HEREFORD, Meade, SD

Built 1983 Load: 40.3 t ADT: 40

SD1804

Fair

Over: CHEYENNE CK

3.7 N JCT US 212, Potter, SD

Built 1969 Load: 40.3 t ADT: 277

SD089

Fair

Over: DRY RUN CK

7.2 N FALL RIVER CO LINE, Custer, SD

Built 1970 Load: 40.4 t ADT: 990

US085 S

Fair

Over: REDWATER RV

AT BUTTE CO LINE, Lawrence, SD

Built 1986 Load: 40.4 t ADT: 4,417

US085 S

Fair

Over: POLO CK

1 S I 90 INTERCH, Lawrence, SD

Built 1971 Load: 40.4 t ADT: 3,439

Minnesota Avenue

Fair

Over: Big Sioux Diversion

south of 60th Street N, Minnehaha, SD

Built 1972 Load: 40.4 t ADT: 5,640

US014 E

Fair

Over: SIX MILE CK

1 SE JCT US 14 BY-PASS, Brookings, SD

Built 1967 Load: 40.5 t ADT: 1,917

US014 W

Fair

Over: SIX MILE CK

1 SE JCT US 14 BY-PASS, Brookings, SD

Built 1970 Load: 40.5 t ADT: 1,917

KIRK RD

Fair

Over: WHITEWOOD CK

1.0E 0.5S LEAD, Lawrence, SD

Built 2004 Load: 40.5 t ADT: 69

469th Avenue

Fair

Over: Saddle Creek

8.9S & 3E of Lennox, Lincoln, SD

Built 2010 Load: 40.5 t ADT: 135

IRR BIA RTE 44

Fair

Over: WEST FORK OF OAK CREEK

1 KM NE OF MAHTO, Corson, SD

Built 1961 Load: 40.6 t ADT: 213

NEW UNDERWOOD RD.

Fair

Over: BELLE FOURCHE RV

17 N NEW UNDERWOOD, Meade, SD

Built 1975 Load: 40.7 t ADT: 280

SD026

Fair

Over: MEDICINE CK

0.3 E HAND CO LINE, Spink, SD

Built 1989 Load: 40.7 t ADT: 244

SD109

Fair

Over: BURLINGTON NORTHERN RR

0.1 N JCT US 12, Grant, SD

Built 1983 Load: 40.8 t ADT: 1,177

SD073

Fair

Over: WEST PLUM CK

2.8 S JCT SD 34, Haakon, SD

Built 1990 Load: 40.8 t ADT: 422

US014A, PINE ST

Fair

Over: WHITEWOOD CK

AT JCT US 85 S, Lawrence, SD

Built 1967 Load: 40.8 t ADT: 10,880

241 STREET

Fair

Over: CK

5.3W & 10N KIMBALL, Brule, SD

Built 1959 Load: 40.9 t ADT: 45

US085 N

Fair

Over: POLO CK

1 S I 90 INTERCH, Lawrence, SD

Built 1971 Load: 40.9 t ADT: 3,439

309 AVENUE

Fair

Over: MEDICINE KNOLL CK

0.3 W 1 S BLUNT, Hughes, SD

Built 2003 Load: 41.0 t ADT: 150

I229 NF (WESTERN)

Fair

Over: BIG SIOUX RV

0.1 S I 229 INTERCH, Minnehaha, SD

Built 1995 Load: 41.0 t ADT: 17,000

SHERIDAN LAKE ROAD

Fair

Over: SPRING CK

1.9N3.4W.ROCKERVILLE, Pennington, SD

Built 1974 Load: 41.0 t ADT: 933

SHERIDAN LAKE ROAD

Fair

Over: SPRING CK

1.8N3.3W ROCKERVILLE, Pennington, SD

Built 1974 Load: 41.0 t ADT: 933

SD044

Fair

Over: CK

2.2 E JCT US16B & SD 44, Pennington, SD

Built 2008 Load: 41.0 t ADT: 5,934

133rd Street

Fair

Over: Foot Creek

1.9W of Aberdeen, Brown, SD

Built 2002 Load: 41.1 t ADT: 60

SD044

Fair

Over: CK

1.2 W JCT SD 47, Gregory, SD

Built 1971 Load: 41.1 t ADT: 568

48480 298TH ST

Fair

Over: CK

12.8E BERESFORD, Union, SD

Built 1987 Load: 41.1 t ADT: 55

SD011

Fair

Over: SPLIT ROCK CK

0.4 S OF GARRETSON, Minnehaha, SD

Built 1964 Load: 41.2 t ADT: 3,286

US012 E

Fair

Over: BNSF RR

3.2 W JCT SD 37, Brown, SD

Built 2005 Load: 41.3 t ADT: 2,783

I029 N

Fair

Over: PEG MUNKY RUN CK

0.9 N SD 28 INTERCH, Deuel, SD

Built 1973 Load: 41.3 t ADT: 4,290

SD013

Fair

Over: SPRING CK

5.2 S BROOKINGS CO LINE, Moody, SD

Built 1963 Load: 41.3 t ADT: 1,135

161ST AVENUE

Fair

Over: BOXELDER CK

0.6S NEW UNDERWOOD, Pennington, SD

Built 1973 Load: 41.3 t ADT: 780

SD010

Fair

Over: CK

5.6 E JCT SD 45, McPherson, SD

Built 1957 Load: 41.4 t ADT: 762

252ND ST, HWY 118

Fair

Over: SLIP-UP CREEK

4.1E & 2S BALTIC, Minnehaha, SD

Built 1973 Load: 41.4 t ADT: 610

168TH STREET

Fair

Over: TIMBER CREEK

4N & 5.2W DOLAND, Spink, SD

Built 1990 Load: 41.5 t ADT: 24

SD044

Fair

Over: LONG CK

0.9 W JCT SD 17, Lincoln, SD

Built 1968 Load: 41.6 t ADT: 1,642

ELM SPRINGS RD.

Fair

Over: BELLE FOURCHE RV

1.9W 3.8N ELM SPRING, Meade, SD

Built 1988 Load: 41.6 t ADT: 60

IRR AR SD063

Fair

Over: BLACK PIPE CK

0.1 SE JACKSON CO LINE, Mellette, SD

Built 1970 Load: 41.6 t ADT: 159

SD044

Fair

Over: BLACK PIPE CK

0.3 E JCT SD 63, Mellette, SD

Built 1987 Load: 41.6 t ADT: 328

SD019

Fair

Over: TURKEY RIDGE CK

2.1 S JCT US 18 WEST, Turner, SD

Built 1963 Load: 41.6 t ADT: 1,358

BROADWAY AVE

Fair

Over: HILGERS GULCH

BROADWAY AVE PIERRE, Hughes, SD

Built 1964 Load: 41.7 t ADT: 6,045

I090 E

Fair

Over: SPRING CK

3 SE SD 34 N INTERCH, Lawrence, SD

Built 1967 Load: 41.7 t ADT: 7,485

SD044

Fair

Over: PINE CK

2.3 W JCT US 83, Mellette, SD

Built 1973 Load: 41.7 t ADT: 328

Russell Street WBL

Fair

Over: Big Sioux River

west of Kiwanis Avenue, Minnehaha, SD

Built 2013 Load: 41.7 t ADT: 19,500

I229 S

Fair

Over: BIG SIOUX RV

0.2 NE 26 ST INTERCH, Minnehaha, SD

Built 1997 Load: 41.7 t ADT: 18,295

I229 N

Fair

Over: BIG SIOUX RV

0.2 NE 26TH ST INTERCH, Minnehaha, SD

Built 1998 Load: 41.7 t ADT: 18,295

IRR I029 S

Fair

Over: BURLINGTON NORTHERN RR

0.6 S US 12 INTERCH, Roberts, SD

Built 1979 Load: 41.7 t ADT: 3,340

SD019A

Fair

Over: VERMILLION RV

0.3 N JCT SD 46, Turner, SD

Built 1968 Load: 41.7 t ADT: 700

COLORADO BLVD

Fair

Over: FALSE BOTTOM CK

2.4E JCT US14A -SPEARFISH, Lawrence, SD

Built 1978 Load: 41.8 t ADT: 1,500

I090 W

Fair

Over: SPRING CK

3 SE SD 34 N INTERCH, Lawrence, SD

Built 1968 Load: 41.8 t ADT: 7,485

SD019

Fair

Over: MISSOURI RIVER/COUNTY RD

4.1 S. OF VERMILLION, Clay, SD

Built 2001 Load: 41.9 t ADT: 1,548

Showing 2,601-2,650 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.