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

TWNSHP RD 184TH ST

Poor

Over: COBB CK

5 S & 4.7 W GARY, Deuel, SD

Built 1960 Load: 24.0 t ADT: 15

49th Street

Poor

Over: Big Sioux River

0.1W of Kiawanis Ave - SF, Minnehaha, SD

Built 1979 Load: 24.1 t ADT: 13,800

29850 407th Avenue

Poor

Over: Trib to Dry Choteau Crk

3.5N of Avon, Bon Homme, SD

Built 1930 Load: 24.4 t ADT: 60

IRR BIA RTE 7

Poor

Over: VIRGIN CREEK

0.5 KM EAST OF PROMISE, Dewey, SD

Built 1961 Load: 24.4 t ADT: 105

383 AVE

Poor

Over: WEST FIRESTEEL CK

3W 9.4N PLANKINTON, Aurora, SD

Built 1973 Load: 24.5 t ADT: 33

376th Street

Poor

Over: Creek

11.2N of 2E of Wessington, Beadle, SD

Built 1920 Load: 24.5 t ADT: 56

383rd Avenue

Poor

Over: Cain Creek

4W & 6.7N of Wolsey, Beadle, SD

Built 1924 Load: 24.5 t ADT: 56

384th Avenue

Poor

Over: Sand Creek

5.5W & 2.7S of Virgil, Beadle, SD

Built 1928 Load: 24.5 t ADT: 56

394th Avenue

Poor

Over: Creek

0.5S of Broadland, Beadle, SD

Built 1940 Load: 24.5 t ADT: 213

202nd Street

Poor

Over: Broadland Creek

2.5S & 1.9E of Broadland, Beadle, SD

Built 1930 Load: 24.5 t ADT: 35

212th Street

Poor

Over: Creek

4S & 1.8W of Huron, Beadle, SD

Built 1928 Load: 24.5 t ADT: 56

409th Avenue

Poor

Over: Creek

8.2S of Cavour, Beadle, SD

Built 1935 Load: 24.5 t ADT: 120

40510 308th Street

Poor

Over: Trib. to Choteau Creek

5S & 1.8W Avon, Bon Homme, SD

Built 1935 Load: 24.5 t ADT: 115

30660 418th Avenue

Poor

Over: Deadman Creek

1.5E of 2.6S of Tyndall, Bon Homme, SD

Built 1967 Load: 24.5 t ADT: 25

310th Street

Poor

Over: Trib to Snatch Ck

3N & 4.7E Springfield, Bon Homme, SD

Built 1940 Load: 24.5 t ADT: 88

123rd Street

Poor

Over: Foot Creek

6.6W & 3S of Westport, Brown, SD

Built 1932 Load: 24.5 t ADT: 35

135th Street

Poor

Over: Foot Creek

1W & 2S of Aberdeen, Brown, SD

Built 1977 Load: 24.5 t ADT: 98

134th Street

Poor

Over: Creek

1.1E of JCT with SD 37, Brown, SD

Built 1930 Load: 24.5 t ADT: 1,400

BROOKER RD

Poor

Over: HILDER BRAND CK

14N 6.4E B FOURCHE, Butte, SD

Built 1985 Load: 24.5 t ADT: 47

VALE CUTOFF RD

Poor

Over: BELLE FOURCHE RV

2.8E & 0.45S Nisland, Butte, SD

Built 1974 Load: 24.5 t ADT: 10

29120 383rd Avenue

Poor

Over: Drainage Ditch

0.3N & 1.0E of Lake Andes, Charles Mix, SD

Built 1930 Load: 24.5 t ADT: 4

28870 385th Avenue

Poor

Over: Creek

3.3N & 3.0E of Lake Andes, Charles Mix, SD

Built 1945 Load: 24.5 t ADT: 48

SIOUX CONIFER ROAD

Poor

Over: BIG SIOUX RV

3.6N 2.0W WATERTOWN, Codington, SD

Built 1940 Load: 24.5 t ADT: 1,499

412TH Avenue

Poor

Over: Creek

0.7 S & 4 W of Andover, Day, SD

Built 1920 Load: 24.5 t ADT: 69

472 AVENUE

Poor

Over: CK

6.2S & 4W CLEAR LAKE, Deuel, SD

Built 1950 Load: 24.5 t ADT: 25

188 STREET

Poor

Over: CK

1.9W BRANDT, Deuel, SD

Built 1930 Load: 24.5 t ADT: 381

370th Avenue

Poor

Over: Creek

12E & 6.4N of Ipswich, Edmunds, SD

Built 1974 Load: 24.5 t ADT: 114

190th Street

Poor

Over: Hidewood Creek

3E of Dempster, Hamlin, SD

Built 1965 Load: 24.5 t ADT: 40

355 AVE

Poor

Over: LOST CK

10.5 N & 5 W MILLER, Hand, SD

Built 1930 Load: 24.5 t ADT: 43

356TH AVE

Poor

Over: WOLF CK

4W & 6.2N MILLER, Hand, SD

Built 1922 Load: 24.5 t ADT: 10

215TH ST

Poor

Over: CK

17S & 5.1E MILLER, Hand, SD

Built 1930 Load: 24.5 t ADT: 10

369 AVE

Poor

Over: CK

4 S 1.2 E ROCKHAM SD, Hand, SD

Built 1966 Load: 24.5 t ADT: 43

370 AVE

Poor

Over: MEDICINE CK

2E & 6.1S ROCKHAM, Hand, SD

Built 1915 Load: 24.5 t ADT: 43

191ST ST

Poor

Over: CK

11N & 0.6W WESSINGTON, Hand, SD

Built 1935 Load: 24.5 t ADT: 15

202ND ST

Poor

Over: CAIN CK

0.3W WESSINGTON, Hand, SD

Built 1925 Load: 24.5 t ADT: 18

41390 251 STREET

Poor

Over: ROCK CK

1.0N & 5.1W OF FULTON SD, Hanson, SD

Built 1963 Load: 24.5 t ADT: 30

25020 415 AVENUE

Poor

Over: ROCK CK

1.8N & 4W FULTON, Hanson, SD

Built 1967 Load: 24.5 t ADT: 60

311 AVENUE

Poor

Over: SOUTH MEDICINE CK

2 E 1.1 N BLUNT, Hughes, SD

Built 1964 Load: 24.5 t ADT: 96

BEN STREET

Poor

Over: PONY CK

BEN STREET PARKSTON, Hutchinson, SD

Built 1941 Load: 24.5 t ADT: 51

41750 290 ST.

Poor

Over: DAWSON CREEK

0.5 W KAYLOR, Hutchinson, SD

Built 1935 Load: 24.5 t ADT: 241

333RD AVENUE

Poor

Over: SOUTH MEDICINE CK

4W 1.2S HIGHMORE, Hyde, SD

Built 1934 Load: 24.5 t ADT: 31

234 STREET

Poor

Over: SMITH CK

2.6N CROW LAKE, Jerauld, SD

Built 1968 Load: 24.5 t ADT: 55

230TH STREET

Poor

Over: MORRIS CK

1S & 2.6E LANE, Jerauld, SD

Built 1937 Load: 24.5 t ADT: 20

461 AVE

Poor

Over: CK

0.9W & 3.8S WENTWORTH, Lake, SD

Built 1950 Load: 24.5 t ADT: 580

ST ONGE ROAD

Poor

Over: MILLER CK

.3W4.5S ST ONGE-SPEARFISH, Lawrence, SD

Built 1950 Load: 24.5 t ADT: 50

NEMO ROAD

Poor

Over: BOXELDER CK

2.3 N 3.5 W OF NEMO, Lawrence, SD

Built 1974 Load: 24.5 t ADT: 282

NEMO ROAD

Poor

Over: BOXELDER CK

2.4 N 3.5 W NEMO, Lawrence, SD

Built 1974 Load: 24.5 t ADT: 425

NEMO ROAD

Poor

Over: BOXELDER CK

1.3 N & 2.6 W NEMO, Lawrence, SD

Built 1975 Load: 24.5 t ADT: 300

465th Avenue

Poor

Over: Trib. to Vermillion Rvr

11.5S & 1W of Lennox, Lincoln, SD

Built 1938 Load: 24.5 t ADT: 45

470th Avenue

Poor

Over: Snake Creek

5.8S & 4E of Lennox, Lincoln, SD

Built 1935 Load: 24.5 t ADT: 50

Showing 5,451-5,500 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.