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 I029 N

Fair

Over: BURLINGTON NORTHERN RR

0.6 S US 12 INTERCH, Roberts, SD

Built 1979 Load: 45.7 t ADT: 3,340

US281

Fair

Over: SNAKE CK

5.8 N JCT US 212, Spink, SD

Built 1978 Load: 45.7 t ADT: 2,226

1ST AVE NE

Fair

Over: WILLOW CK

1ST AVE NE, Codington, SD

Built 2008 Load: 45.8 t ADT: 200

SD013

Fair

Over: SPRING CK

4.1 S BROOKINGS CO LINE, Moody, SD

Built 1963 Load: 45.8 t ADT: 1,135

SD037

Fair

Over: CK

0.2E & 0.8N SPRINGFIELD, Bon Homme, SD

Built 2000 Load: 45.9 t ADT: 726

SD079

Fair

Over: NORTH CANAL

4.5 N NEWELL & JCT 212 E, Butte, SD

Built 1962 Load: 45.9 t ADT: 786

244TH ST, HWY 102

Fair

Over: PIPESTONE CREEK

6N & 2.1W SHERMAN, Minnehaha, SD

Built 2005 Load: 46.0 t ADT: 301

SD044

Fair

Over: CK

11.4 E OF WINNER, Tripp, SD

Built 1971 Load: 46.0 t ADT: 568

SD053

Fair

Over: WHITE RV

MELLETTE CO LINE, Lyman, SD

Built 2001 Load: 46.1 t ADT: 60

US085

Fair

Over: NORTH BR MOREAU RV

10 N BUTTE CO LINE, Harding, SD

Built 1974 Load: 46.3 t ADT: 1,223

I029 S

Fair

Over: BNSF RR

0.6 N SD 44 INTERCH, Lincoln, SD

Built 2000 Load: 46.3 t ADT: 12,340

US016A

Fair

Over: BATTLE CK

2.7 S JCT US 16, Pennington, SD

Built 1968 Load: 46.3 t ADT: 3,638

167TH ST

Fair

Over: CREEK

2S 1.5W ASHTON, Spink, SD

Built 1997 Load: 46.3 t ADT: 55

460th Avenue

Fair

Over: Boswell Diversion Ditch

5.9S & 1E of Castlewood, Hamlin, SD

Built 1929 Load: 46.4 t ADT: 129

SD040

Fair

Over: BATTLE CK

2.2 E JCT US 16A, Pennington, SD

Built 1974 Load: 46.4 t ADT: 995

2500 WEST MAIN ST.

Fair

Over: BNSF RR

0.5S,0.5W VERMILLION, Clay, SD

Built 1996 Load: 46.5 t ADT: 700

SD079S

Fair

Over: BEAVER CK

2.7 N FALL RIVER CO LINE, Custer, SD

Built 2004 Load: 46.6 t ADT: 2,203

US012

Fair

Over: WHETSTONE RV DIV CHANNEL

0.6 E JCT SD 109, Grant, SD

Built 1955 Load: 46.6 t ADT: 3,824

142nd Street

Fair

Over: Moccasin Creek

0.2N & 2.8E of Warner, Brown, SD

Built 2001 Load: 46.7 t ADT: 255

S BROADWAY WTN

Fair

Over: BIG SIOUX RV

S. BROADWAY - WATERTOWN, Codington, SD

Built 1962 Load: 46.7 t ADT: 169

I090

Fair

Over: RC,P&E RR

ADJ TO BLACKHAWK INT, Meade, SD

Built 2008 Load: 46.7 t ADT: 21,020

10th Avenue

Fair

Over: HAY CK

10th Avenue, Butte, SD

Built 1961 Load: 46.8 t ADT: 300

SD324

Fair

Over: MEDARY CK OVERFLOW

0.4 E I 29 INTERCH, Brookings, SD

Built 1974 Load: 46.9 t ADT: 1,295

US016A

Fair

Over: GRACE COOLIDGE CK

0.2 W JCT SD 36, Custer, SD

Built 1987 Load: 46.9 t ADT: 1,335

158TH ST

Fair

Over: SOUTH FORK SNAKE CK

5S & 0.1E CRESBARD, Faulk, SD

Built 1988 Load: 46.9 t ADT: 55

I090

Fair

Over: SLIP UP CK

1 E I 229 INTERCH, Minnehaha, SD

Built 1993 Load: 46.9 t ADT: 19,640

OFFETT ST

Fair

Over: CK

2.5 W OF BOX ELDER, Pennington, SD

Built 1962 Load: 46.9 t ADT: 50

214TH STREET

Fair

Over: CK

2S & 2.6W BROOKINGS, Brookings, SD

Built 1970 Load: 47.2 t ADT: 63

WHITEWOOD VALLEYRD

Fair

Over: BELLE FOURCHE RV

EAST EDGE OF NISLAND, Butte, SD

Built 1980 Load: 47.2 t ADT: 55

IRR SD025

Fair

Over: CK

0.9 E MARSHALL CO LINE, Roberts, SD

Built 1960 Load: 47.2 t ADT: 514

SD027

Fair

Over: DRY RUN CK

0.3 E OF LANGFORD, Marshall, SD

Built 1980 Load: 47.4 t ADT: 727

IRR I029 S

Fair

Over: SOO LINE RR

0.5 N SD 127 INTERCH, Roberts, SD

Built 1976 Load: 47.4 t ADT: 2,665

IRR I029 N

Fair

Over: SOO LINE RR

0.5 N SD 127 INTERCH, Roberts, SD

Built 1976 Load: 47.4 t ADT: 2,665

SD1804

Fair

Over: OKOBOJO CK

5.2 N HUGHES CO LINE, Sully, SD

Built 1972 Load: 47.4 t ADT: 634

US018

Fair

Over: FALL RV

0.8 W JCT SD 79 N, Fall River, SD

Built 2010 Load: 47.6 t ADT: 4,764

42580 287 ST.

Fair

Over: LONETREE CK

1.0S & 0.2W OF OLIVET, Hutchinson, SD

Built 1989 Load: 47.6 t ADT: 25

I090 W

Fair

Over: BURLINGTON NORTHERN RR

0.9 E I 29 INTERCH, Minnehaha, SD

Built 1992 Load: 47.6 t ADT: 13,405

US018

Fair

Over: DRAW

3 S JCT US 18 & SD 89, Fall River, SD

Built 1982 Load: 47.7 t ADT: 2,290

SD042

Fair

Over: BIG SIOUX RV

5.3 E I 229 INTERCH, Minnehaha, SD

Built 1995 Load: 47.8 t ADT: 11,510

SD034

Fair

Over: FALSE BOTTOM CK

5.1 SE BUTTE CO LINE, Lawrence, SD

Built 1998 Load: 47.9 t ADT: 3,410

US014

Fair

Over: COTTONWOOD CK

0.7 E PENNINGTON CO LINE, Jackson, SD

Built 1955 Load: 48.0 t ADT: 970

PRIVATE DR/US16 F

Fair

Over: SPRING CK

0.5M S & 0.5M W HILL CITY, Pennington, SD

Built 1980 Load: 48.0 t ADT: 10

361ST AVE

Fair

Over: SOUTH FORK SNAKE CK

5.3N MIRANDA, Faulk, SD

Built 1995 Load: 48.1 t ADT: 39

SD047

Fair

Over: SOUTH MEDICINE CK

2.8 S JCT US 14, Hyde, SD

Built 1959 Load: 48.1 t ADT: 542

US014 E

Fair

Over: NORTH DEER CK OVERFLOW

4.1 E OF VOLGA, Brookings, SD

Built 1979 Load: 48.2 t ADT: 4,096

US016

Fair

Over: CK

0.2 E JCT US 385 S, Custer, SD

Built 1966 Load: 48.4 t ADT: 9,174

SD079S

Fair

Over: FRENCH CK

11.5 S JCT SD 36 W, Custer, SD

Built 2003 Load: 48.5 t ADT: 2,203

SD079N

Fair

Over: FRENCH CK

11.5 S JCT SD 36 W, Custer, SD

Built 2003 Load: 48.5 t ADT: 2,203

US014 W

Fair

Over: BIG SIOUX RV OVERFLOW

2.4 MI EAST OF VOLGA, Brookings, SD

Built 2001 Load: 48.6 t ADT: 4,096

ELM SPRINGS RD.

Fair

Over: ELK CK

4.3S & 1.2E ELM SPRG, Meade, SD

Built 1965 Load: 48.6 t ADT: 58

Showing 2,751-2,800 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.