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

243rd Avenue

Poor

Over: West Pipestone Creek

13.0S & 0.2E of Flandreau, Moody, SD

Built 1990 Load: 12.4 t ADT: 50

177TH ST

Poor

Over: CK

4S 7.5W REDFIELD, Spink, SD

Built 1935 Load: 12.4 t ADT: 55

30830 405TH AVE

Poor

Over: Trib. to Choteau Creek

6.3 S 1 W AVON, Bon Homme, SD

Built 1935 Load: 12.5 t ADT: 60

365 AVE

Poor

Over: SHAEFER CK

5 E & 11.1 N MILLER, Hand, SD

Built 1935 Load: 12.6 t ADT: 15

220 AVENUE

Poor

Over: LAKE CK

1.2E 6.3S MARTIN, Bennett, SD

Built 1950 Load: 12.7 t ADT: 40

219TH STREET

Poor

Over: CK

5S & 0.7E AURORA, Brookings, SD

Built 1930 Load: 12.7 t ADT: 19

38890 286th Street

Poor

Over: Andes Creek

6.0N & 6.9E Lake Andes, Charles Mix, SD

Built 1930 Load: 12.7 t ADT: 48

Main Street

Poor

Over: MITCHELL CK

MIDLAND, Haakon, SD

Built 1955 Load: 12.7 t ADT: 45

243 ST

Poor

Over: ROCK CK

10S & 9.2W HOWARD, Miner, SD

Built 1925 Load: 12.7 t ADT: 25

46020 282 ST

Poor

Over: VERMILLION RV

3N & 0.2E DAVIS, Turner, SD

Built 1985 Load: 12.7 t ADT: 97

473RD AVENUE

Poor

Over: BR NORTH DEER CK

5W & 3.4N WHITE, Brookings, SD

Built 1930 Load: 12.8 t ADT: 92

27290 433 AVE.

Poor

Over: CK

5.1N,5.0W FREEMAN, Hutchinson, SD

Built 1935 Load: 12.8 t ADT: 15

234 ST

Poor

Over: ROCK CK

1S & 6.1W HOWARD, Miner, SD

Built 1926 Load: 12.8 t ADT: 25

300 STREET

Poor

Over: SAND CK

1.7W & 4S KEYAPAHA, Tripp, SD

Built 1967 Load: 12.9 t ADT: 55

475TH AVENUE

Poor

Over: SIX MILE CK

2.3S & 3W WHITE, Brookings, SD

Built 1930 Load: 13.0 t ADT: 92

127th Street

Poor

Over: Creek

4.5W & 3N Pierpont, Day, SD

Built 1930 Load: 13.0 t ADT: 23

COUNTY RD

Poor

Over: ROCK CK

2.3E CARTHAGE, Miner, SD

Built 1930 Load: 13.1 t ADT: 228

217th Street

Poor

Over: S. Fork of Pearl Creek

2.9E & 9S of Cavour, Beadle, SD

Built 1930 Load: 13.2 t ADT: 56

383rd Avenue

Poor

Over: Creek

0.7W & 0.1N of Mansfield, Brown, SD

Built 1930 Load: 13.2 t ADT: 98

171ST ST

Poor

Over: CREEK

7S 2.9W ATHOL, Spink, SD

Built 1930 Load: 13.2 t ADT: 55

329 AVENUE

Poor

Over: WEST BR BULL CK

13E 0.9S WINNER, Tripp, SD

Built 1950 Load: 13.2 t ADT: 35

205TH STREET

Poor

Over: NORTH DEER CK

7N & 2.9W BROOKINGS, Brookings, SD

Built 1930 Load: 13.3 t ADT: 92

OLD HWY 85

Poor

Over: FOUR MILE CK

4.2E 32.8N B FOURCHE, Butte, SD

Built 1945 Load: 13.3 t ADT: 25

FAS 6253

Poor

Over: NORTH FORK BAD RV

15 W 6.8N PHILIP, Haakon, SD

Built 1950 Load: 13.3 t ADT: 48

256TH STREET

Poor

Over: SLIP-UP CREEK

3.7E & 6S BALTIC, Minnehaha, SD

Built 1938 Load: 13.3 t ADT: 80

PAULSEN RD

Poor

Over: COTTONWOOD CK

0.6W & 2.1N OF QUINN, Pennington, SD

Built 1964 Load: 13.3 t ADT: 17

397TH AVE.

Poor

Over: SAND CK

7.5N WOONSOCKET, Sanborn, SD

Built 1920 Load: 13.3 t ADT: 35

408TH AVENUE

Poor

Over: DRY RUN CK

3 E LOOMIS, Davison, SD

Built 1935 Load: 13.4 t ADT: 25

223RD STREET

Poor

Over: TRIB TO CHEYENNE RIVER

1.1W&6S OF CREIGHTON, Pennington, SD

Built 1935 Load: 13.4 t ADT: 20

COTTONWOOD STREET

Poor

Over: BIG SIOUX RV

12.3W .5N SOUTHSHORE, Codington, SD

Built 1973 Load: 13.6 t ADT: 40

177 STREET

Poor

Over: BIG SIOUX RV

5.0S 2.5E WATERTOWN, Codington, SD

Built 1920 Load: 13.6 t ADT: 73

476 AVENUE

Poor

Over: SOUTH FORK YELLOW BANK R

4.8S LABOLT, Grant, SD

Built 1925 Load: 13.6 t ADT: 176

PAULSEN RD

Poor

Over: COTTONWOOD CK

0.5W & 2.2N OF QUINN, Pennington, SD

Built 1964 Load: 13.6 t ADT: 17

DILLINGER RD

Poor

Over: HORSE CK

2 W 1.1 S NEWELL, Butte, SD

Built 1937 Load: 13.7 t ADT: 46

ROY STREET

Poor

Over: GRIZZLY BEAR CK

ROY ST - KEYSTONE, Pennington, SD

Built 1955 Load: 13.7 t ADT: 200

301 STREET

Poor

Over: CK

1.8N 4W WEWELA, Tripp, SD

Built 1958 Load: 13.7 t ADT: 31

COUNTY RD

Poor

Over: CK

2 S & 2.6 E DE SMET, Kingsbury, SD

Built 1930 Load: 13.8 t ADT: 35

256TH STREET

Poor

Over: WEST BR SKUNK CK

3.5N & 0.3W HARTFORD, Minnehaha, SD

Built 1930 Load: 13.8 t ADT: 13

472ND AVENUE

Poor

Over: MEDARY CK

1E & 6.1S BROOKINGS, Brookings, SD

Built 1910 Load: 13.9 t ADT: 92

472nd Avenue

Poor

Over: Saddle Creek

7.3S of Worthing, Lincoln, SD

Built 1938 Load: 14.1 t ADT: 150

29210 412th Avenue

Poor

Over: Emanuel Creek

11W of Scotland, Bon Homme, SD

Built 1975 Load: 14.2 t ADT: 127

40340 287 ST.

Poor

Over: CK

3.0S,1.4E OF DELMONT, Douglas, SD

Built 1912 Load: 14.2 t ADT: 20

26970 417 AVE.

Poor

Over: TWELVE MILE CK

6.3N,7.0E PARKSTON, Hutchinson, SD

Built 1978 Load: 14.2 t ADT: 45

237 STREET

Poor

Over: COTTONWOOD CK

2.5E COTTONWOOD, Jackson, SD

Built 1935 Load: 14.2 t ADT: 10

237 STREET

Poor

Over: SOUTH FORK BAD RIVER

6.7E COTTONWOOD, Jackson, SD

Built 1935 Load: 14.2 t ADT: 11

425TH AVE

Poor

Over: CK

2 E .1 S BANCROFT, Kingsbury, SD

Built 1935 Load: 14.2 t ADT: 95

ANTELOPE CREEK RD.

Poor

Over: ELK CK

24E & 13.5S STURGIS, Meade, SD

Built 1976 Load: 14.2 t ADT: 56

222 ST

Poor

Over: WEST REDSTONE CK

5.5W CARTHAGE, Miner, SD

Built 1930 Load: 14.2 t ADT: 148

241 ST

Poor

Over: JAMES RV

7.4E LETCHER, Sanborn, SD

Built 1973 Load: 14.2 t ADT: 16

475TH AVENUE

Poor

Over: MEDARY CK

1.8S & 1W AURORA, Brookings, SD

Built 1930 Load: 14.3 t ADT: 92

Showing 5,151-5,200 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.