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

482 AVE

Unknown

Over: I029

0.5 SE JEFFERSON INTERCH, Union, SD

Built 1961 ADT: 13,030

484 AVE

Unknown

Over: I029

3.4 NW N SCITY INTERCH, Union, SD

Built 1961 ADT: 13,030

SD029 P

Unknown

Over: I029

1.9 N of N SIOUX CITY INT, Union, SD

Built 1961 ADT: 14,730

I029 S

Unknown

Over: RIVER DRIVE

N SIOUX CITY INTERCHANGE, Union, SD

Built 1981 ADT: 8,603

I029 N

Unknown

Over: RIVER DRIVE

N SIOUX CITY INTERCHANGE, Union, SD

Built 1981 ADT: 8,603

DAKOTA DUNES BLVD

Unknown

Over: I029

1.6 S NSCITY INTERCHANGE, Union, SD

Built 1991 ADT: 28,610

SO DAK OWNED RR

Unknown

Over: CITY STREET

NORTH SIOUX CITY, Union, SD

Built 1930 ADT: 1,870

SO DAK OWNED RR

Unknown

Over: CITY STREET

NORTH SIOUX CITY, Union, SD

Built 1930 ADT: 1,870

BURL NORTHERN RR

Unknown

Over: SD271

1.1 NE JCT SD 130, Walworth, SD

Built 1936 ADT: 133

11980 - 421 AVE

Fair

Over: CK

3.2N & 2E LANGFORD, Marshall, SD

Built 1930 ADT: 35

270 STREET

Fair

Over: OLD LODGE CK

1.7E & 8N WINNER, Tripp, SD

Built 1955 Load: 2.5 t ADT: 73

338th Avenue

Fair

Over: Waterhole Creek

7.1E & 16.1S of Reliance, Lyman, SD

Built 1950 Load: 2.6 t ADT: 15

STATE PARK RD

Fair

Over: SPLIT ROCK CK

1.5S & 0.5 W GARRETSON, Minnehaha, SD

Built 1908 Load: 2.7 t ADT: 35

187 AVE

Fair

Over: DEEP CK

21KM W & 11KM N OF FAITH, Perkins, SD

Built 1985 Load: 3.6 t ADT: 50

215TH STREET

Fair

Over: BIG SIOUX RV

3S & 2.7W BROOKINGS, Brookings, SD

Built 1900 Load: 4.2 t ADT: 63

181ST AVENUE

Fair

Over: DEEP CK

30KM W & 9 KM N OF FAITH, Perkins, SD

Built 1990 Load: 6.3 t ADT: 20

40290 285 ST

Fair

Over: CK

1.0S,0.9E OF DELMONT, Douglas, SD

Built 1925 Load: 6.6 t ADT: 10

214th Street

Fair

Over: Middle Pearl Creek

6S & 0.4E of Cavour, Beadle, SD

Built 1930 Load: 6.8 t ADT: 121

VALLERY RD

Fair

Over: STINKINGWATER CK

1.0S 1.0W NISLAND, Butte, SD

Built 1920 Load: 7.0 t ADT: 47

474 AVENUE

Fair

Over: CK

4W & 1.9S MILBANK, Grant, SD

Built 1926 Load: 7.0 t ADT: 15

225TH ST.

Fair

Over: CK

.9W 8N ARTESIAN, Sanborn, SD

Built 1905 Load: 7.5 t ADT: 56

285 STREET

Fair

Over: WEST BR BULL CK

4.8E 0.8N COLOME, Tripp, SD

Built 1987 Load: 7.8 t ADT: 31

27890 451 AVE

Fair

Over: CK

3.9S & 2W PARKER, Turner, SD

Built 1950 Load: 7.9 t ADT: 50

CORRAL RD.

Fair

Over: PINE CK

13E&0.8S UNIONCENTER, Meade, SD

Built 1966 Load: 8.0 t ADT: 10

110th Street

Fair

Over: Creek

0.3W & 5S of Claire City, Roberts, SD

Built 1940 Load: 8.3 t ADT: 35

OLD HWY 212

Fair

Over: STATION ELM CK

2N 14E OF NEWELL, Butte, SD

Built 1945 Load: 8.5 t ADT: 48

468th Avenue

Fair

Over: Beaver Creek

2.2N & 2E of Lennox, Lincoln, SD

Built 1940 Load: 8.5 t ADT: 68

165TH ST

Fair

Over: SNAKE CREEK

1.5 W ASHTON, Spink, SD

Built 1957 Load: 8.8 t ADT: 148

45090 299 ST

Fair

Over: Turkey Creek

7 N & 0.1 W Volin, Yankton, SD

Built 1940 Load: 8.8 t ADT: 5

463rd Avenue

Fair

Over: Creek

4.3W of Wilmot, Roberts, SD

Built 1935 Load: 8.9 t ADT: 34

40401 - 298TH ST

Fair

Over: DRY CHOTEAU CREEK

4.0 N & 2.0 W OF AVON, Bon Homme, SD

Built 1901 Load: 9.0 t ADT: 60

38580 300th Street

Fair

Over: Marty Mission Spillway

6.9S & 2.2W of Ravina, Charles Mix, SD

Built 1937 Load: 9.0 t ADT: 48

475TH AVENUE

Fair

Over: CK

2.9N & 3W BUSHNELL, Brookings, SD

Built 1930 Load: 9.3 t ADT: 92

411th Avenue

Fair

Over: Creek

5E & 0.6N of Groton, Brown, SD

Built 1925 Load: 9.3 t ADT: 98

475th Avenue

Fair

Over: West Brule Creek

3E & 1.4N of Beresford, Lincoln, SD

Built 1936 Load: 9.7 t ADT: 35

OLD HWY 85

Fair

Over: BATTLE CK

28.2N 4.2E B FOURCHE, Butte, SD

Built 1945 Load: 9.8 t ADT: 25

466 AVENUE

Fair

Over: CK

1.3E & 3.7N MARVIN, Grant, SD

Built 1930 Load: 10.0 t ADT: 54

471 AVENUE

Fair

Over: CK

7W & 2.1N MILBANK, Grant, SD

Built 1926 Load: 10.0 t ADT: 25

473 AVENUE

Fair

Over: CK

1E & 0.1S STRANDBURG, Grant, SD

Built 1936 Load: 10.0 t ADT: 25

207TH STREET

Fair

Over: CK

2.1 E DE SMET, Kingsbury, SD

Built 1930 Load: 10.1 t ADT: 25

30620 455 AVE

Fair

Over: CK

9.2S & 3E IRENE SD, Clay, SD

Built 1974 Load: 10.3 t ADT: 97

151 STREET

Fair

Over: BIG SIOUX RV

13.1W & 4.5S MARVIN, Grant, SD

Built 1958 Load: 10.3 t ADT: 45

TRASK RD

Fair

Over: BULL CK

3.2E 8.5N WASTA, Pennington, SD

Built 1964 Load: 10.3 t ADT: 51

39320 291st Street

Fair

Over: Creek

6.0N & 1.8W of Wagner, Charles Mix, SD

Built 1935 Load: 10.4 t ADT: 48

327 AVENUE

Fair

Over: CK

4E 6.5S COLOME, Tripp, SD

Built 1952 Load: 10.6 t ADT: 31

375th Avenue

Fair

Over: Sand Creek

1E & 8.3S pf Wessington, Beadle, SD

Built 1932 Load: 10.7 t ADT: 56

201ST STREET

Fair

Over: CK

2.5N & 7.2E WHITE, Brookings, SD

Built 1930 Load: 10.7 t ADT: 62

OLD HWY 79

Fair

Over: MOREAU RV

6.7 W .1 N HOOVER, Butte, SD

Built 1930 Load: 10.7 t ADT: 22

475th Avenue

Fair

Over: Big Sioux River

1.1N & 12W of Ward, Moody, SD

Built 1966 Load: 10.7 t ADT: 67

37380 281st Street

Fair

Over: Pease Creek

4.0N & 0.2W of Geddes, Charles Mix, SD

Built 1945 Load: 10.8 t ADT: 48

Showing 451-500 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.