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

Poor

Over: CK

2.8E & 1.0 N AURORA, Brookings, SD

Built 1930 Load: 14.3 t ADT: 50

230 ST

Poor

Over: CROW CK

1.5S & 17.4W WSSGTN SPRGS, Jerauld, SD

Built 2002 Load: 14.3 t ADT: 35

Township Road

Poor

Over: Dirt Lodge Creek

2.2E & 12.9S WATAUGA, Corson, SD

Built 1932 Load: 14.4 t ADT: 30

408TH AVENUE

Poor

Over: SOUTH FORK TWELVE MILE C

1W & 13.7 S MITCHELL, Davison, SD

Built 1930 Load: 14.5 t ADT: 81

COUNTY RD

Poor

Over: FALL RV

3.2E & 1.8S HOT SPRINGS, Fall River, SD

Built 1932 Load: 14.5 t ADT: 41

456 AVENUE

Poor

Over: Indian River

3.1 MI S & 8 W OF MARVIN, Grant, SD

Built 1960 Load: 14.5 t ADT: 35

468th Avenue

Poor

Over: Creek

1.8S & 0.3E of Wilmot, Roberts, SD

Built 1901 Load: 14.5 t ADT: 50

32201 478TH AVE.

Poor

Over: Lewis Ditch

2E & 1.9N ELK POINT, Union, SD

Built 1940 Load: 14.5 t ADT: 40

467th Avenue

Poor

Over: Saddle Creek

1E & 9.3S of Lennox, Lincoln, SD

Built 1972 Load: 14.6 t ADT: 25

469th Avenue

Poor

Over: Tributary to Ash Creek

2W & 0.3N of Beresford, Lincoln, SD

Built 1935 Load: 14.6 t ADT: 261

476th Avenue

Poor

Over: Trib. to W Brule Creek

4E & 0.7N of Beresford, Lincoln, SD

Built 1940 Load: 14.6 t ADT: 137

43160 307th Street

Poor

Over: Marne Creek

3S & 3.4W of Utica, Yankton, SD

Built 1930 Load: 14.6 t ADT: 10

219TH STREET

Poor

Over: CK

1.1E & 7S BROOKINGS, Brookings, SD

Built 1977 Load: 14.7 t ADT: 108

209TH STREET

Poor

Over: SIX MILE CK

3N & 2.3E BROOKINGS, Brookings, SD

Built 1967 Load: 14.7 t ADT: 99

200TH STREET

Poor

Over: SIXMILE CK

3.5N & 0.8E WHITE, Brookings, SD

Built 1966 Load: 14.7 t ADT: 127

486TH AVENUE

Poor

Over: CK

3.2N & 8E BUSHNELL, Brookings, SD

Built 1961 Load: 14.7 t ADT: 175

46080 313 ST.

Poor

Over: CLAY CK

0.8N & 3.8E MECKLING, Clay, SD

Built 1983 Load: 14.7 t ADT: 125

201 ST

Poor

Over: CK

3 S & 2.7 W MILLER, Hand, SD

Built 1926 Load: 14.7 t ADT: 10

369 AVE

Poor

Over: CK

1 E & 6.2 S ROCKHAM, Hand, SD

Built 1935 Load: 14.7 t ADT: 10

203RD ST

Poor

Over: SOUTH FORK PEARL CK

5 N & 0.6 E IROQUOIS, Kingsbury, SD

Built 1930 Load: 14.7 t ADT: 15

212TH ST

Poor

Over: LAKE WHITEWOOD

3.7S 0.5E LK PRESTON, Kingsbury, SD

Built 1978 Load: 14.7 t ADT: 104

164TH STREET

Poor

Over: TIMBER CREEK

8N & 4.8W DOLAND, Spink, SD

Built 1940 Load: 14.7 t ADT: 9

28320 445TH AVE

Poor

Over: TURKEY RIDGE CK

2W & 9.2S MARION, Turner, SD

Built 1945 Load: 14.7 t ADT: 60

207TH STREET

Poor

Over: CK

10N & 1.4W ELKTON, Brookings, SD

Built 1950 Load: 14.8 t ADT: 65

Hanson Avenue

Poor

Over: MITCHELL CK

6.2 W & 7.9 N MIDLAND, Haakon, SD

Built 1986 Load: 14.8 t ADT: 28

Cottonwood Road

Poor

Over: COTTONWOOD CK

0.4S COTTONWOOD, Jackson, SD

Built 1936 Load: 15.0 t ADT: 35

414TH AVE

Poor

Over: WEST REDSTONE CK

0.5W 3.5N ARTESIAN, Sanborn, SD

Built 1920 Load: 15.0 t ADT: 56

38450 292nd Street

Poor

Over: Creek

0.2S & 2.5E Lake Andes, Charles Mix, SD

Built 1935 Load: 15.1 t ADT: 48

397th Avenue

Poor

Over: Mud Creek

1E & 3.8S of Stratford, Brown, SD

Built 1930 Load: 15.2 t ADT: 98

ASH STREET

Poor

Over: PONY CK

ASH STREET PARKSTON, Hutchinson, SD

Built 1950 Load: 15.2 t ADT: 317

161ST STREET

Poor

Over: CREEK

9.1W TURTON, Spink, SD

Built 1930 Load: 15.2 t ADT: 100

318 AVENUE

Poor

Over: KEYA PAHA RV

1.5W & 1.5N WEWELA, Tripp, SD

Built 1945 Load: 15.2 t ADT: 50

47960 312TH ST

Poor

Over: WEST UNION CK

11.5S & 0.6E ALCESTER, Union, SD

Built 1986 Load: 15.2 t ADT: 40

30820 480 AVE.

Poor

Over: CK

1E & 6.2S ALCESTER, Union, SD

Built 1935 Load: 15.2 t ADT: 40

29650 426th Avenue

Poor

Over: Prairie Creek

2E & 3.5S of Scotland, Bon Homme, SD

Built 1925 Load: 15.3 t ADT: 60

484th Avenue

Poor

Over: Trib. to Pattee Creek

3.5W & 1.1N of Hudson, Lincoln, SD

Built 1935 Load: 15.3 t ADT: 50

228 ST

Poor

Over: ROCK CK

5.0N & 6.3W HOWARD, Miner, SD

Built 1930 Load: 15.4 t ADT: 20

359TH AVE

Poor

Over: CK

1W & 2.4S MILLER, Hand, SD

Built 1930 Load: 15.5 t ADT: 15

221 STREET

Poor

Over: SAND CK

0.1W JCT US 281, Jerauld, SD

Built 1934 Load: 15.5 t ADT: 275

451st Avenue

Poor

Over: Trib. to E Fork Verm Rv

W. City Limit - Montrose, McCook, SD

Built 1930 Load: 15.5 t ADT: 66

214th Street

Poor

Over: Silver Creek

12.2W of Virgil, Beadle, SD

Built 1930 Load: 15.7 t ADT: 120

207TH STREET

Poor

Over: CK

5N & 1.3W BROOKINGS, Brookings, SD

Built 1958 Load: 15.7 t ADT: 32

FAS 6247

Poor

Over: Bear Creek

0.7 W 3.1 N LANTRY, Dewey, SD

Built 1960 Load: 15.7 t ADT: 103

CHANCE ROAD

Poor

Over: RABBIT CK

15.7S 3.4E BISON, Perkins, SD

Built 1950 Load: 15.8 t ADT: 26

468TH AVENUE

Poor

Over: CK

13.9N & 3W BROOKINGS, Brookings, SD

Built 1930 Load: 15.9 t ADT: 92

THUNDERHEAD FALLS

Poor

Over: RAPID CK

0.9E 1.5S JOHNSON SD, Pennington, SD

Built 1972 Load: 15.9 t ADT: 218

30680 432nd Avenue

Poor

Over: Marne Creek

3W & 2.8S of Utica, Yankton, SD

Built 1940 Load: 15.9 t ADT: 10

300 STREET

Poor

Over: SHADY CK

14.7W & 2.75N WEWELA, Tripp, SD

Built 1966 Load: 16.0 t ADT: 31

418th Avenue

Poor

Over: Antelope Creek

4.8N & 1W of Pierpont, Day, SD

Built 1928 Load: 16.1 t ADT: 15

206TH STREET

Poor

Over: REDSTONE CK

6 S & 1.9 E BANCROFT, Kingsbury, SD

Built 1940 Load: 16.1 t ADT: 27

Showing 5,201-5,250 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.