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

272 STREET

Fair

Over: BR THUNDER CK

6N & 4.1E WINNER, Tripp, SD

Built 1959 Load: 17.5 t ADT: 80

309TH AVENUE

Fair

Over: CK

0.2 W 0.4 S BLUNT, Hughes, SD

Built 1962 Load: 17.6 t ADT: 152

378th Avenue

Fair

Over: Creek

5.7S & 9.5W of Virgil, Beadle, SD

Built 1955 Load: 17.7 t ADT: 56

ELK CREEK RD.

Fair

Over: ANTELOPE CK

13S&22.2E STURGIS, Meade, SD

Built 1954 Load: 17.7 t ADT: 63

161ST STREET

Fair

Over: DRAINAGE DITCH

2.4W TURTON, Spink, SD

Built 1930 Load: 17.7 t ADT: 169

42860 COLONY RD.

Fair

Over: JAMES RV

6.9N 2.6E OLIVET, Hutchinson, SD

Built 1961 Load: 17.8 t ADT: 147

239 STREET

Fair

Over: SMITH CK

3.9E & 10N PUKWANA, Brule, SD

Built 1959 Load: 17.9 t ADT: 41

355 AVENUE

Fair

Over: SMITH CK

9.7N & 5E PUKWANA, Brule, SD

Built 1959 Load: 17.9 t ADT: 41

272 STREET

Fair

Over: THUNDER CK

6N & 2.9E WINNER, Tripp, SD

Built 1959 Load: 17.9 t ADT: 110

44367 309th Street

Fair

Over: James River

1.1S&2.4W of Mission Hill, Yankton, SD

Built 1952 Load: 17.9 t ADT: 2,250

173RD AVE

Fair

Over: BOXELDER CK

0.2 S.E. OWANKA, Pennington, SD

Built 1981 Load: 18.0 t ADT: 14

42070 292ND STREET

Fair

Over: DAWSON CK

0.5N 3.3W SCOTLAND, Bon Homme, SD

Built 2014 Load: 18.1 t ADT: 386

42110 307th Street

Fair

Over: Snatch Creek

3S & 4.1E of Tyndall, Bon Homme, SD

Built 1950 Load: 18.1 t ADT: 67

212TH STREET

Fair

Over: CK

1S & 3.1E VOLGA, Brookings, SD

Built 1950 Load: 18.1 t ADT: 92

216TH STREET

Fair

Over: BIG SIOUX RV OVERFLOW

4S & 2.8W BROOKINGS, Brookings, SD

Built 1955 Load: 18.1 t ADT: 454

CAMP CROOK RD

Fair

Over: SOUTH INDIAN CK

4.3 N JCT US85, Butte, SD

Built 1962 Load: 18.1 t ADT: 40

STATE HWY 10

Fair

Over: SPRING CREEK & RESERVOIR

1/2 Mile No. of Pollock, Campbell, SD

Built 1961 Load: 18.1 t ADT: 129

475TH AVE

Fair

Over: CK

1.8N & 1W of Clear Lake, Deuel, SD

Built 1960 Load: 18.1 t ADT: 30

TWNSHP RD 185TH ST

Fair

Over: CK

3.0N 2.3W BRANDT, Deuel, SD

Built 1940 Load: 18.1 t ADT: 35

IRR BIA RTE 2

Fair

Over: LITTLE MOREAU CREEK

3.2 KM W OF WHITE HORSE, Dewey, SD

Built 1960 Load: 18.1 t ADT: 109

152 STREET

Fair

Over: INDIAN RV

12.2W & 5.5S MARVIN, Grant, SD

Built 1932 Load: 18.1 t ADT: 52

156 ST

Fair

Over: CK

2.5E & 6.0S TWIN BROOKS, Grant, SD

Built 1901 Load: 18.1 t ADT: 35

363 AVE

Fair

Over: WOLF CK

8.2 N ST. LAWRENCE, Hand, SD

Built 1951 Load: 18.1 t ADT: 78

374 AVE

Fair

Over: WOLF CK

5E 1.5S BURDETTE, Hand, SD

Built 1956 Load: 18.1 t ADT: 43

229 ST

Fair

Over: BATTLE CK

7.2E & 3.5S RAMONA, Lake, SD

Built 1941 Load: 18.1 t ADT: 265

BOXELDER CAMP

Fair

Over: BOXELDER CREEK

T 3 N R 5 E SEC 20, Meade, SD

Built 1948 Load: 18.1 t ADT: 25

BIG FOOT RD

Fair

Over: KIMBALL CK

3.4 E 9.8 S QUINN, Pennington, SD

Built 1962 Load: 18.1 t ADT: 79

472nd Avenue

Fair

Over: Creek

0.9N of Corona, Roberts, SD

Built 1955 Load: 18.1 t ADT: 208

343 AVE

Fair

Over: WEST FORK VERMILLION RV

3.9N HOWARD, Miner, SD

Built 1940 Load: 18.2 t ADT: 40

473rd Avenue

Fair

Over: Big Slough Creek

0.9N of Rosholt, Roberts, SD

Built 1953 Load: 18.2 t ADT: 620

35400 271st Street

Fair

Over: Snake Creek

1W of Academy, Charles Mix, SD

Built 1963 Load: 18.3 t ADT: 48

28770 423 AVE.

Fair

Over: SOUTH BR LONETREE CK

3 W & 1.7 S OLIVET, Hutchinson, SD

Built 1960 Load: 18.3 t ADT: 69

471st Avenue

Fair

Over: Snake Creek

3.8S & 1W of Worthing, Lincoln, SD

Built 1935 Load: 18.3 t ADT: 45

41780 308th Street

Fair

Over: Deadman Creek

4S & 0.8E of Tyndall, Bon Homme, SD

Built 1930 Load: 18.4 t ADT: 60

242 STREET

Fair

Over: BR SMITH CK

1.5W & 9N KIMBALL, Brule, SD

Built 1959 Load: 18.4 t ADT: 43

363 AVE

Fair

Over: SHAEFER CK

6.1 W BURDETTE, Hand, SD

Built 1957 Load: 18.4 t ADT: 43

HEREFORD RD.

Fair

Over: CK

29E & 3.8N STURGIS, Meade, SD

Built 1960 Load: 18.4 t ADT: 55

223rd Street

Fair

Over: Spring Creek

3.3W of Ward, Moody, SD

Built 1951 Load: 18.4 t ADT: 263

NEMO ROAD

Fair

Over: BOXELDER CK

11.2W 4.IN RAPID CITY, Pennington, SD

Built 1972 Load: 18.4 t ADT: 974

289 STREET

Fair

Over: WILLOW CK

2.5W & 3N CLEARFIELD, Tripp, SD

Built 1958 Load: 18.4 t ADT: 110

28450 447TH AVE

Fair

Over: TURKEY RIDGE CK

11S MARION, Turner, SD

Built 1953 Load: 18.4 t ADT: 189

IRR COUNTY ROAD

Fair

Over: FLINT ROCK CK

5.5 N & 8.5 W RED EL, Ziebach, SD

Built 1945 Load: 18.4 t ADT: 16

478TH AVENUE

Fair

Over: SIX MILE CK

0.5N WHITE, Brookings, SD

Built 1950 Load: 18.5 t ADT: 714

46050 294TH ST

Fair

Over: TURKEY RIDGE CK

1.5W CENTERVILLE, Turner, SD

Built 2002 Load: 18.5 t ADT: 97

173 ST (MEADE CO)

Fair

Over: BEAVER CK

13.0S 3.3E FAITH, Ziebach, SD

Built 1935 Load: 18.5 t ADT: 10

386 AVE

Fair

Over: WEST FIRESTEEL CK

9.1 N PLANKINTON, Aurora, SD

Built 1930 Load: 18.6 t ADT: 53

393 AVE

Fair

Over: SAND CK

1E & 2.1S ALPENA, Jerauld, SD

Built 1953 Load: 18.6 t ADT: 79

27510 395 AVE

Fair

Over: CHOTEAU CK

4.9N,3.0E OF ARMOUR, Douglas, SD

Built 1940 Load: 18.7 t ADT: 77

475th Avenue

Fair

Over: Trib. to W Brule Creek

3E & 4.3N of Beresford, Lincoln, SD

Built 1935 Load: 18.7 t ADT: 45

220 AVENUE

Fair

Over: BEAR IN THE LODGE CK

5.8N 1.8E MARTIN, Bennett, SD

Built 1958 Load: 18.8 t ADT: 40

Showing 651-700 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.