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

293rd Street

Poor

Over: Trib. to W Brule Creek

4N & 2.7E of Beresford, Lincoln, SD

Built 1940 Load: 24.5 t ADT: 45

480th Avenue

Poor

Over: East Brule Creek

8E & 0.6N of Beresford, Lincoln, SD

Built 1935 Load: 24.5 t ADT: 50

293rd Street

Poor

Over: Trib. to Pattee Creek

4N & 10.6E of Beresford, Lincoln, SD

Built 1940 Load: 24.5 t ADT: 35

483rd Avenue

Poor

Over: Trib. to Finnie Creek

4.5W & 2.6S of Hudson, Lincoln, SD

Built 1935 Load: 24.5 t ADT: 45

484th Avenue

Poor

Over: Trib. to Finnie Creek

3.5W & 2.7S of Hudson, Lincoln, SD

Built 1941 Load: 24.5 t ADT: 50

415th Avenue

Poor

Over: Crow Creek Ditch

2.2N of Amherst, Marshall, SD

Built 1974 Load: 24.5 t ADT: 322

263rd Street

Poor

Over: Wolf Creek

1N & 3.2W of Bridgewater, McCook, SD

Built 1961 Load: 24.5 t ADT: 35

433rd Avenue

Poor

Over: Tributary to Wolf Creek

2E & 5.1N of Spencer, McCook, SD

Built 1977 Load: 24.5 t ADT: 50

439th Avenue

Poor

Over: W. Fork of Vermillion Rv

2W & 4.1N of Salem, McCook, SD

Built 1961 Load: 24.5 t ADT: 45

246th Street

Poor

Over: Trib. to Little Verm Rvr

6.5N & 1.3E of Salem, McCook, SD

Built 1965 Load: 24.5 t ADT: 66

260th Street

Poor

Over: Trib. to W Fork Verm Rv

7.5S & 1.4E of Salem, McCook, SD

Built 1925 Load: 24.5 t ADT: 45

DUNN RD.

Poor

Over: SOUTH CANAL

6E & 12.5N STURGIS, Meade, SD

Built 1968 Load: 24.5 t ADT: 75

PIONEER RD.

Poor

Over: ELK CK

32.7E & 15.9S OF STURGIS, Meade, SD

Built 1955 Load: 24.5 t ADT: 10

HAYDRAW RD.

Poor

Over: EAST ELM CK

3.2N & 35E STURGIS, Meade, SD

Built 1949 Load: 24.5 t ADT: 33

242 ST

Poor

Over: ROCK CK

9W CANOVA, Miner, SD

Built 1966 Load: 24.5 t ADT: 24

428 AVE

Poor

Over: CK

6W & 4.3N HOWARD, Miner, SD

Built 1940 Load: 24.5 t ADT: 61

242 ST

Poor

Over: WEST FORK VERMILLION RV

1.4E CANOVA, Miner, SD

Built 1972 Load: 24.5 t ADT: 250

226 ST

Poor

Over: E FORK VERMILLION RV

7.0N & 7.2E HOWARD, Miner, SD

Built 2000 Load: 24.5 t ADT: 60

221st Street

Poor

Over: Lake Campbell Inlet

20.2W & 2N of Ward, Moody, SD

Built 1978 Load: 24.5 t ADT: 45

471st Avenue

Poor

Over: Bachelor Creek

1E & 3.1S of Colman, Moody, SD

Built 1997 Load: 24.5 t ADT: 50

475th Avenue

Poor

Over: Trib. to Big Sioux River

1.8N & 12W of Ward, Moody, SD

Built 1980 Load: 24.5 t ADT: 67

238th Street

Poor

Over: Brookfield Creek

2N & 2.6E of Trent, Moody, SD

Built 1920 Load: 24.5 t ADT: 45

163RD STREET

Poor

Over: CREEK

2S & 10.1W TURTON, Spink, SD

Built 1935 Load: 24.5 t ADT: 55

151ST STREET

Poor

Over: CREEK

6.5W & 3N CONDE, Spink, SD

Built 1935 Load: 24.5 t ADT: 34

156TH STREET

Poor

Over: CREEK

2S & 2.5W CONDE, Spink, SD

Built 1966 Load: 24.5 t ADT: 13

160TH ST

Poor

Over: CREEK

1.0N & 2.5 W TURTON, Spink, SD

Built 1965 Load: 24.5 t ADT: 50

407TH AVE

Poor

Over: CREEK

2.8N & 1E TURTON, Spink, SD

Built 1963 Load: 24.5 t ADT: 50

409TH AVE

Poor

Over: CREEK

3E & 0.9S CONDE, Spink, SD

Built 1935 Load: 24.5 t ADT: 34

188 STREET

Poor

Over: CK

20.3W & 3S ONIDA, Sully, SD

Built 1964 Load: 24.5 t ADT: 75

301 AVENUE

Poor

Over: Okobojo Creek

3W & 3.4N ONIDA, Sully, SD

Built 1961 Load: 24.5 t ADT: 20

315 AVENUE

Poor

Over: MEDICINE CK

11E & 7.4S ONIDA, Sully, SD

Built 1956 Load: 24.5 t ADT: 64

320 AVENUE

Poor

Over: CK

16E & 10.2S ONIDA, Sully, SD

Built 1961 Load: 24.5 t ADT: 25

44280 283RD ST

Poor

Over: CK

9S & 4.2W MARION, Turner, SD

Built 1990 Load: 24.5 t ADT: 50

26890 443 AVE

Poor

Over: CK

2E & 0.1N DOLTON, Turner, SD

Built 1950 Load: 24.5 t ADT: 50

27220 444 AVE

Poor

Over: CK

0.8N & 3W MARION, Turner, SD

Built 1950 Load: 24.5 t ADT: 100

44960 274 ST

Poor

Over: WEST FORK VERMILLION RV

1N & 3.2W PARKER, Turner, SD

Built 1992 Load: 24.5 t ADT: 97

45380 271 ST

Poor

Over: EAST FORK VERMILLION RV

4N & 0.8E PARKER, Turner, SD

Built 1950 Load: 24.5 t ADT: 50

46220 275 ST

Poor

Over: LONG CK

2N & 1.2E CHANCELLOR, Turner, SD

Built 1977 Load: 24.5 t ADT: 570

46360 277 ST

Poor

Over: LONG CK

2.6E CHANCELLOR, Turner, SD

Built 1987 Load: 24.5 t ADT: 25

32200 477TH AVE

Poor

Over: CK

1E & 2N ELK POINT, Union, SD

Built 1968 Load: 24.5 t ADT: 40

48480 CO HWY 13

Poor

Over: GREEN CK

1.8S & 5.8E ALCESTER, Union, SD

Built 1985 Load: 24.5 t ADT: 500

45170 313 ST

Poor

Over: Unnamed Creek

7 S & 0.7 E Volin, Yankton, SD

Built 1940 Load: 24.5 t ADT: 45

YOUNGBERG RD

Poor

Over: DRY CK

2.8 S 3 E NEWELL, Butte, SD

Built 1945 Load: 24.8 t ADT: 32

FAS 3214

Poor

Over: DAN POWELL CK

8.5 W JCT US 83, Stanley, SD

Built 1936 Load: 24.8 t ADT: 210

IRR US012

Poor

Over: BR SNAKE CK

1.7 NW JCT SD 20, Corson, SD

Built 1965 Load: 24.9 t ADT: 1,102

NORRIS PEAK ROAD

Poor

Over: RAPID CK

JOHNSON'S SIDING, Pennington, SD

Built 1973 Load: 24.9 t ADT: 654

SD020 P

Poor

Over: CK

NORTH LAKE KAMPESKA, Codington, SD

Built 1931 Load: 25.1 t ADT: 56

US014 EF

Poor

Over: LONE TREE CK

3.2 S STANLEY CO LINE, Haakon, SD

Built 1920 Load: 25.1 t ADT: 50

SD037

Poor

Over: CK

7.8 N JCT US 212, Spink, SD

Built 1958 Load: 25.1 t ADT: 446

COUNTY RD

Poor

Over: SAND CK

2N & 1.6W FORESTBURG, Sanborn, SD

Built 1940 Load: 25.3 t ADT: 70

Showing 5,501-5,550 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.