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

168TH ST

Poor

Over: CREEK

4S 2.7W ATHOL, Spink, SD

Built 1940 Load: 6.4 t ADT: 50

112th Street

Poor

Over: Crow Creek

2S & 0.6E of Britton, Marshall, SD

Built 1968 Load: 6.5 t ADT: 35

WINKLER RD

Poor

Over: HORSE CK

5.0 W 4.1 N NEWELL, Butte, SD

Built 1958 Load: 6.6 t ADT: 47

29610 457 AVE

Poor

Over: CK

1E & 5.1S VIBORG, Turner, SD

Built 1945 Load: 6.6 t ADT: 97

118th Street

Poor

Over: Langford Ditch

5N & 1W of Langford, Marshall, SD

Built 1935 Load: 6.7 t ADT: 25

Willow St.-Presho

Poor

Over: Medicine Creek

1E of Presho, Lyman, SD

Built 1930 Load: 6.9 t ADT: 60

269 STREET

Poor

Over: OLD LODGE CK

2E & 9N WINNER, Tripp, SD

Built 1955 Load: 6.9 t ADT: 40

206TH STREET

Poor

Over: SIXMILE CK

2.5S & 3.1W WHITE, Brookings, SD

Built 1940 Load: 7.0 t ADT: 92

410th Avenue

Poor

Over: Pearl Creek

1E & 2.8S of Cavour, Beadle, SD

Built 1930 Load: 7.1 t ADT: 56

44820 304 ST

Poor

Over: Tributary to Clay Creek

4N&2.2E Mission Hill, Yankton, SD

Built 1940 Load: 7.1 t ADT: 45

470TH AVENUE

Poor

Over: CK

14.3N & 1W BROOKINGS, Brookings, SD

Built 1930 Load: 7.3 t ADT: 92

Old NE Road

Poor

Over: BIG BUFFALO CK

2W & 2.4S CACTUS FLAT, Jackson, SD

Built 1940 Load: 7.3 t ADT: 27

300 AVENUE

Poor

Over: SAND CK

1.4W & 2.1S KEYAPAHA, Tripp, SD

Built 1965 Load: 7.3 t ADT: 29

268 STREET

Poor

Over: OLD LODGE CK

3.3E & 9N WINNER, Tripp, SD

Built 1960 Load: 7.4 t ADT: 31

324 AVENUE

Poor

Over: MOCASSIN CK

0.3N & 0.2E OF HAMILL, Tripp, SD

Built 1924 Load: 7.4 t ADT: 20

318 AVENUE

Poor

Over: OLD LODGE CK

3E & 9.3N WINNER, Tripp, SD

Built 1958 Load: 7.6 t ADT: 37

407TH AVENUE

Poor

Over: NORTH BR TWELVE MILE CK

2 W & 8.3 S MITCHELL, Davison, SD

Built 1930 Load: 7.7 t ADT: 64

100th Street

Poor

Over: Wild Rice Creek

10N & 3.1E of Britton, Marshall, SD

Built 1935 Load: 7.8 t ADT: 80

473 AVENUE

Poor

Over: SOUTH FORK WHETSTONE RV

5W & 0.2N MILBANK, Grant, SD

Built 1942 Load: 7.9 t ADT: 25

45190 299 ST

Poor

Over: Trib. to Turkey Creek

2 S & 0.1 W Irene, Yankton, SD

Built 1940 Load: 7.9 t ADT: 5

42090 305th Street

Poor

Over: Snatch Creek

1S & 3.9E of Tyndall, Bon Homme, SD

Built 1950 Load: 8.1 t ADT: 60

153RD ST

Poor

Over: SNAKE CREEK

1.0N 4.1W NORTHVILLE, Spink, SD

Built 1913 Load: 8.1 t ADT: 55

39450 292nd Street

Poor

Over: Choteau Creek

5.0N & 0.5W of Wagner, Charles Mix, SD

Built 1974 Load: 8.2 t ADT: 40

144 STREET

Poor

Over: CK

10.1W & 2.5N MARVIN, Grant, SD

Built 1956 Load: 8.2 t ADT: 55

476 AVENUE

Poor

Over: CK

2W & 5.3S MILBANK, Grant, SD

Built 1920 Load: 8.2 t ADT: 10

165 STREET

Poor

Over: SOUTH FORK YELLOW BANK R

4.7E & 4S STRANDBURG, Grant, SD

Built 1940 Load: 8.2 t ADT: 26

485 AVENUE

Poor

Over: CK

3E & 4.5S ALBEE, Grant, SD

Built 1950 Load: 8.2 t ADT: 35

487 AVENUE

Poor

Over: NORTH FORK YELLOW BANK R

9E & 1.3S MILBANK, Grant, SD

Built 1958 Load: 8.2 t ADT: 35

STATE PARK RD

Poor

Over: CK

4.4E 3.5N STURGIS, Meade, SD

Built 1964 Load: 8.2 t ADT: 33

223RD STREET

Poor

Over: BIG SIOUX RV

EGAN, SD, Moody, SD

Built 1922 Load: 8.2 t ADT: 100

167TH ST

Poor

Over: James River

1.8S 0.9E ASHTON, Spink, SD

Built 1912 Load: 8.2 t ADT: 54

210TH STREET

Poor

Over: BIG SIOUX RV

1N & 1.8E VOLGA, Brookings, SD

Built 1907 Load: 8.3 t ADT: 92

479TH AVENUE

Poor

Over: CK

1.6N & 1E WHITE, Brookings, SD

Built 1920 Load: 8.3 t ADT: 92

36460 276th Street

Poor

Over: Platte Creek

2.4W & 0.2N of Platte, Charles Mix, SD

Built 1936 Load: 8.3 t ADT: 48

280 STREET

Poor

Over: THUNDER CK

3.4E & 3S WINNER, Tripp, SD

Built 1962 Load: 8.4 t ADT: 31

41460 301st Street

Poor

Over: Emanuel Creek

2N & 1.4W of Tyndall, Bon Homme, SD

Built 1930 Load: 8.6 t ADT: 60

295th Street

Poor

Over: Trib. to E Brule Creek

2N & 6.4E of Beresford, Lincoln, SD

Built 1940 Load: 8.7 t ADT: 41

THUNDERHEAD FALLS

Poor

Over: RAPID CK

0.8E 1.9S JOHNSON SD, Pennington, SD

Built 1972 Load: 8.7 t ADT: 62

463rd Avenue

Poor

Over: Creek

4W & 3S of Wilmot, Roberts, SD

Built 1929 Load: 8.9 t ADT: 30

471st Avenue

Poor

Over: Creek

0.8NW of Corona, Roberts, SD

Built 1934 Load: 9.0 t ADT: 50

192nd Street

Poor

Over: Creek

16N & 4.8W of Iroquois, Beadle, SD

Built 1928 Load: 9.1 t ADT: 33

STATE PARK RD

Poor

Over: Grace Coolidge Creek

8.6E 3.7N OF CUSTER, Custer, SD

Built 1950 Load: 9.1 t ADT: 100

STATE PARK RD

Poor

Over: Grace Coolidge Creek

9E 2.6N CUSTER, Custer, SD

Built 1950 Load: 9.1 t ADT: 100

423rd Avenue

Poor

Over: BURLINGTON NORTHERN RR

3rd Street - Bristol, Day, SD

Built 1938 Load: 9.1 t ADT: 218

27140 404 AVE

Poor

Over: CK

12.5 N 2.5E DELMONT, Douglas, SD

Built 1985 Load: 9.1 t ADT: 10

150 STREET

Poor

Over: CK

1.9W & 1S MILBANK, Grant, SD

Built 1925 Load: 9.1 t ADT: 35

CENTER ROAD

Poor

Over: CK

1.5W & 5.1S MILBANK, Grant, SD

Built 1927 Load: 9.1 t ADT: 20

FAIRVIEW ROAD

Poor

Over: SOUTH FORK BAD RV

5E & 3S COTTONWOOD, Jackson, SD

Built 1940 Load: 9.1 t ADT: 10

OLD HIGHWAY 79

Poor

Over: ANTELOPE HOLLOW CK

0.8S & 0.2E OELRICHS, Fall River, SD

Built 1930 Load: 9.2 t ADT: 100

158TH STREET

Poor

Over: CREEK

3N & 2.5W TURTON, Spink, SD

Built 1935 Load: 9.2 t ADT: 31

Showing 5,001-5,050 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.