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

213TH STREET

Fair

Over: REDSTONE CK

2 N & 3.6 E ESMOND, Kingsbury, SD

Built 1940 Load: 10.8 t ADT: 35

214th Street

Fair

Over: Silver Creek

6.5W of Virgil, Beadle, SD

Built 1930 Load: 10.9 t ADT: 120

470TH AVENUE

Fair

Over: BIG SIOUX RV

0.6W & 4.1S BROOKINGS, Brookings, SD

Built 1930 Load: 10.9 t ADT: 1,330

463 AVENUE

Fair

Over: WILLOW CK

1.3W 4.1N KRANZBURG, Codington, SD

Built 1950 Load: 10.9 t ADT: 340

STATE PARK RD

Fair

Over: FRENCH CK

6.7E 3.5S CUSTER, Custer, SD

Built 1950 Load: 10.9 t ADT: 5

IRR STATE PARK RD

Fair

Over: LITTLE MOREAU RV

5.7S .3W TIMBER LK, Dewey, SD

Built 1950 Load: 10.9 t ADT: 5

474 AVENUE

Fair

Over: SOUTH FORK YELLOW BANK R

2E & 4.8S STRANDBURG, Grant, SD

Built 1933 Load: 10.9 t ADT: 25

HWY 1416

Fair

Over: Trib. to Box Elder Creek

1.1 E OF BOX ELDER, Pennington, SD

Built 1924 Load: 11.0 t ADT: 1,552

30090 401st Avenue

Fair

Over: Choteau Creek

0.9S & 1.0E of Dante, Charles Mix, SD

Built 1925 Load: 11.1 t ADT: 48

27690 411 AVE.

Fair

Over: NORTH BR DRY CK

1.9S 1E PARKSTON, Hutchinson, SD

Built 1925 Load: 11.1 t ADT: 69

469TH AVENUE

Fair

Over: SIX MILE CK

2W & 0.5S BROOKINGS, Brookings, SD

Built 1930 Load: 11.2 t ADT: 92

206TH STREET

Fair

Over: CK

11.1N & 0.1W ELKTON, Brookings, SD

Built 1910 Load: 11.2 t ADT: 62

391st Avenue

Fair

Over: Moccasin Creek

2.3N & 5W of Stratford, Brown, SD

Built 1958 Load: 11.2 t ADT: 141

30660 454 AVE

Fair

Over: CLAY CK

9.6S & 2E IRENE, Clay, SD

Built 1935 Load: 11.2 t ADT: 35

S 11TH STREET

Fair

Over: FRENCH CK

S 11TH STREET; CUSTER, Custer, SD

Built 1973 Load: 11.2 t ADT: 100

134th Street

Fair

Over: N. Fork Whetstone Rv

2.3N & 0.8W of Wilmot, Roberts, SD

Built 1960 Load: 11.2 t ADT: 30

263RD STREET

Fair

Over: ENEMY CK

9.8W & 2.0N OF ETHAN, Davison, SD

Built 1991 Load: 11.3 t ADT: 64

259TH STREET

Fair

Over: ENEMY CK

5 S & 0.8 W MITCHELL, Davison, SD

Built 1989 Load: 11.3 t ADT: 64

469 AVENUE

Fair

Over: CK

4.3E & 0.2N MARVIN, Grant, SD

Built 1930 Load: 11.4 t ADT: 25

PAULSEN RD

Fair

Over: COTTONWOOD CK

2.3E & 2.2N OF QUINN, Pennington, SD

Built 1959 Load: 11.4 t ADT: 25

COUNTY RD

Fair

Over: CK

1.3N & 5.2E STURGIS, Meade, SD

Built 1940 Load: 11.5 t ADT: 15

400th Avenue

Fair

Over: Mud Creek

4E & 0.9S of Stratford, Brown, SD

Built 1956 Load: 11.7 t ADT: 46

216TH STREET

Fair

Over: CK

2S & 1.1W AURORA, Brookings, SD

Built 1983 Load: 11.8 t ADT: 92

STATE PARK RD

Fair

Over: FRENCH CK

6.2E 3.5S CUSTER, Custer, SD

Built 1950 Load: 11.8 t ADT: 5

COTTONWOOD ROAD

Fair

Over: WHITEWATER CK

3.8S COTTONWOOD, Jackson, SD

Built 1959 Load: 11.8 t ADT: 35

STATE PARK RD

Fair

Over: CK

4.2E 3.4N STURGIS, Meade, SD

Built 1964 Load: 11.8 t ADT: 50

SIOUX AVE

Fair

Over: MEADE DITCH

.2 MI S OF ST. PATRICK RC, Pennington, SD

Built 1974 Load: 11.8 t ADT: 50

30690 433rd Avenue

Fair

Over: Beaver Creek

2.8S & 2W of Utica, Yankton, SD

Built 1940 Load: 11.9 t ADT: 150

27490 424 AVE.

Fair

Over: CK

13.2E & 0.1N OF PARKSTON, Hutchinson, SD

Built 1930 Load: 12.0 t ADT: 145

31030 411th Avenue

Fair

Over: Emanuel Creek

1.7N&4.3W of Springfield, Bon Homme, SD

Built 1960 Load: 12.2 t ADT: 60

376TH AVE

Fair

Over: CREEK

4.0W 0.4S ATHOL, Spink, SD

Built 1930 Load: 12.2 t ADT: 55

HWY 63 SERVICE RD

Fair

Over: COTTONWOOD CK

4.2S JCT SD34 & US14, Stanley, SD

Built 1920 Load: 12.2 t ADT: 50

COUNTY RD

Fair

Over: CK

7.1 W & 11.3 S FAITH, Meade, SD

Built 1935 Load: 12.3 t ADT: 21

41470 272 STR.

Fair

Over: CK

3.7 E 3 N PARKSTON, Hutchinson, SD

Built 1988 Load: 12.4 t ADT: 69

474th Avenue

Fair

Over: Big Slough Creek

1E & 1N of Rosholt, Roberts, SD

Built 1960 Load: 12.6 t ADT: 30

377th Avenue

Fair

Over: Willow Creek

8W & 2.1N of Westport, Brown, SD

Built 1950 Load: 12.7 t ADT: 66

142nd Street

Fair

Over: Moccasin Creek

0.2W of Warner, Brown, SD

Built 1951 Load: 12.7 t ADT: 384

145 STREET

Fair

Over: WHETSTONE RV

0.6S & 2.4W BIG STONE, Grant, SD

Built 1959 Load: 12.7 t ADT: 374

220TH

Fair

Over: ELK CK

14S 21.9E OF STURGIS, Meade, SD

Built 1950 Load: 12.7 t ADT: 10

216TH STREET

Fair

Over: DEER CREEK

3.1E & 4.1S BROOKINGS, Brookings, SD

Built 1983 Load: 12.9 t ADT: 92

352 AVENUE

Fair

Over: SQUAW CK

2E & 6.8S HERRICK, Gregory, SD

Built 1956 Load: 12.9 t ADT: 36

452nd Avenue

Fair

Over: Trib. to E Fork Verm Rv

2.4S & 1E of Montrose, McCook, SD

Built 1925 Load: 13.0 t ADT: 66

MYSTIC ROAD

Fair

Over: RAPID CK

0.6 GW 1.9N MYSTIC, Pennington, SD

Built 1940 Load: 13.1 t ADT: 128

449th Avenue

Fair

Over: Little Vermillion River

0.2N & 8E of Salem, McCook, SD

Built 1930 Load: 13.2 t ADT: 35

5th Street

Fair

Over: Split Rock Creek

west of N. Main Avenue, Minnehaha, SD

Built 1966 Load: 13.2 t ADT: 500

HWY 1416

Fair

Over: TRIB BOX ELDER CK

1.2 E OF BOX ELDER, Pennington, SD

Built 1924 Load: 13.2 t ADT: 1,134

190th Street

Fair

Over: Turtle Creek

12.0W of Hitchcock, Beadle, SD

Built 1980 Load: 13.3 t ADT: 410

459th Avenue

Fair

Over: Boswell Diversion Ditch

6.5S of Castlewood, Hamlin, SD

Built 1956 Load: 13.3 t ADT: 253

458th Avenue

Fair

Over: Creek

2.5N of Sisseton, Roberts, SD

Built 1940 Load: 13.4 t ADT: 30

CRESTON ROAD

Fair

Over: SPRING CK

8.5E 7.3S FARMINGDALE, Pennington, SD

Built 1967 Load: 13.5 t ADT: 27

Showing 501-550 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.