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

248th Street

Fair

Over: Wolf Creek

4N & 0.4E of Spencer, McCook, SD

Built 1993 Load: 52.1 t ADT: 30

260th Street

Fair

Over: W. Fork of Vermillion Rv

7S & 0.3E of Salem, McCook, SD

Built 2007 Load: 52.1 t ADT: 50

I029 S

Fair

Over: ELLIS AND EASTERN RR

0.3 N 12TH ST INTERCH, Minnehaha, SD

Built 2004 Load: 52.2 t ADT: 30,330

SD044

Fair

Over: CAMP CK

3.1 E JCT SD 19, Turner, SD

Built 1968 Load: 52.4 t ADT: 1,034

I090

Fair

Over: NORTH BR MORRIS CK

0.7 NW TILFORD INTERCH, Meade, SD

Built 1956 Load: 52.5 t ADT: 18,420

SD034 W

Fair

Over: JAMES RV

0.9 SE OF FORESTBURG, Sanborn, SD

Built 2003 Load: 52.5 t ADT: 1,253

SD034 E

Fair

Over: JAMES RV

0.9 SE OF FORESTBURG, Sanborn, SD

Built 2004 Load: 52.5 t ADT: 1,253

480 AVENUE

Fair

Over: CK

2W & 0.8N ALBEE, Grant, SD

Built 2001 Load: 52.6 t ADT: 25

IRR SD063

Fair

Over: RUDEY CK

10.2 N HAAKON CO LINE, Ziebach, SD

Built 1993 Load: 52.6 t ADT: 656

SAGE CREEK ROAD

Fair

Over: CK

1.8E 1.0N SCENIC, Pennington, SD

Built 1959 Load: 52.9 t ADT: 160

SD015

Fair

Over: CK

0.3 N JCT SD 22, Deuel, SD

Built 1994 Load: 53.1 t ADT: 2,219

I029 N

Fair

Over: ELLIS AND EASTERN RR

0.3 N 12TH ST INTERCH, Minnehaha, SD

Built 2004 Load: 53.3 t ADT: 30,330

US016A

Fair

Over: DRAW

1.9 S JCT SD 244, Pennington, SD

Built 1992 Load: 53.3 t ADT: 582

SD044

Fair

Over: RAPID CK

1.1 E JCT US 16, Pennington, SD

Built 1952 Load: 53.3 t ADT: 17,360

US085

Fair

Over: WHITEWOOD CK

0.1 NE JCT US 385, Lawrence, SD

Built 1993 Load: 53.5 t ADT: 6,526

SD049

Fair

Over: BLACK DOG CK

0.3 SW LYMAN CO LINE, Tripp, SD

Built 1964 Load: 53.5 t ADT: 376

US014

Fair

Over: REDSTONE CK

7.2 E BEADLE CO LINE, Kingsbury, SD

Built 1987 Load: 53.7 t ADT: 1,631

US018, SER RD

Fair

Over: CK

1.8 W OF WINNER, Tripp, SD

Built 1965 Load: 53.7 t ADT: 2,820

US014 W

Fair

Over: NORTH DEER CK

3.9 MI EAST OF VOLGA, Brookings, SD

Built 2001 Load: 54.0 t ADT: 4,096

SD224

Fair

Over: DRY RUN CK

0.7 E JERAULD CO LINE, Sanborn, SD

Built 1962 Load: 54.1 t ADT: 1,126

I090

Fair

Over: HIGGINS GULCH

1 W US 85 INTERCH, Lawrence, SD

Built 1974 Load: 54.2 t ADT: 7,640

SD037 N

Fair

Over: LAKE MITCHELL SPILLWAY

2.7 N JCT I 90 LOOP, Davison, SD

Built 1960 Load: 54.4 t ADT: 2,460

US016

Fair

Over: SPRING CK

1.8 W JCT US 385, Pennington, SD

Built 1986 Load: 54.4 t ADT: 6,231

47260 311 ST

Fair

Over: CK

13S & 0.6E BERESFORD, Union, SD

Built 1991 Load: 54.4 t ADT: 30

US085

Fair

Over: MILLER CK

0.3 S I 90 INTERCH, Lawrence, SD

Built 1971 Load: 54.6 t ADT: 5,754

254TH ST, HWY 122

Fair

Over: SLIP-UP CK

1.0S & 6.7W GARRETSON, Minnehaha, SD

Built 2015 Load: 54.8 t ADT: 736

SAGE CREEK ROAD

Fair

Over: BEAR CK

1.6E 0.9N SENIC, Pennington, SD

Built 1959 Load: 55.0 t ADT: 160

SD019

Fair

Over: HURLEY CK

2 N JCT US 18 EAST, Turner, SD

Built 1965 Load: 55.1 t ADT: 1,212

US212

Fair

Over: CK

5.8 SW MEADE CO LINE, Butte, SD

Built 1956 Load: 55.2 t ADT: 494

Sertoma Avenue

Fair

Over: Trib to Skunk Creek

0.3S of 12th Street, Minnehaha, SD

Built 1996 Load: 55.2 t ADT: 30

IRR SD063

Fair

Over: OAK CK

1.8 N OF MCLAUGHLIN, Corson, SD

Built 1980 Load: 55.3 t ADT: 875

US014 E

Fair

Over: NORTH DEER CK

3.9 E OF VOLGA, Brookings, SD

Built 1978 Load: 55.9 t ADT: 4,096

SD028

Fair

Over: BR SHUE CK

2.8 E SPINK CO LINE, Clark, SD

Built 2016 Load: 55.9 t ADT: 334

CAMBELL ST

Fair

Over: CK

1.8 N JCT US 16B, Pennington, SD

Built 1964 Load: 56.7 t ADT: 23,179

SD079

Fair

Over: SOUTH BR DRY CK

2.8 N NEWELL & JCT 212 E, Butte, SD

Built 1962 Load: 56.9 t ADT: 786

244 ST

Fair

Over: EAST FORK VERMILLION RV

2.4W & 3.0S ORLAND, Lake, SD

Built 2005 Load: 57.2 t ADT: 35

146th Street

Fair

Over: Snake Creek

2.0N & 7.4W of Mansfield, Brown, SD

Built 2004 Load: 57.3 t ADT: 98

I229

Fair

Over: CK

0.2 SW SD 115 INTERCH, Minnehaha, SD

Built 1959 Load: 57.3 t ADT: 43,830

US085

Fair

Over: CK

10 N OF BELLE FOURCHE, Butte, SD

Built 1966 Load: 57.4 t ADT: 1,551

I090

Fair

Over: BR BIG BUFFALO CK

2.5 E SD 240 S INTERCH, Jackson, SD

Built 1968 Load: 57.6 t ADT: 6,560

I090

Fair

Over: CK

2 SE US 14 & I90 INTERCH, Pennington, SD

Built 1958 Load: 57.8 t ADT: 6,270

470 AVENUE

Fair

Over: CK

5.3E & 0.2N MARVIN, Grant, SD

Built 2001 Load: 58.1 t ADT: 95

US212

Fair

Over: BELLE FOURCHE RV

5.7 E JCT US 85, Butte, SD

Built 2002 Load: 58.4 t ADT: 1,740

SD027

Fair

Over: MUD CK

8.9 S MARSHALL CO LINE, Day, SD

Built 1970 Load: 58.9 t ADT: 253

SD027

Fair

Over: CK

4.7 S MARSHALL CO LINE, Day, SD

Built 1970 Load: 59.4 t ADT: 518

SD079

Fair

Over: SOUTH CANAL

0.6 S BUTTE CO LINE, Meade, SD

Built 1954 Load: 59.5 t ADT: 2,199

US016A

Fair

Over: GRACE COOLIDGE CK

0.1 N JCT SD 36 E, Custer, SD

Built 1986 Load: 59.8 t ADT: 534

I090

Fair

Over: RCP&E RR

3.6 E WASTA INTERCH, Pennington, SD

Built 1996 Load: 60.1 t ADT: 7,370

US018

Fair

Over: DE BELL CK

1.2 E TODD CO LINE, Tripp, SD

Built 1988 Load: 60.1 t ADT: 1,053

US016

Fair

Over: SPRING CK

1.2 E OF HILL CITY, Pennington, SD

Built 1986 Load: 60.5 t ADT: 6,231

Showing 2,851-2,900 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.