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

455 AVENUE

Poor

Over: CK

0.9 N JCT SD 20 W, Codington, SD

Built 1940 Load: 19.1 t ADT: 672

COUNTY RD

Poor

Over: CK

MIDLAND, Haakon, SD

Built 1941 Load: 19.1 t ADT: 30

25210 413 AVENUE

Poor

Over: ROCK CK

6.0 MI W OF FULTON, Hanson, SD

Built 1983 Load: 19.1 t ADT: 70

41330 264 STREET

Poor

Over: CK

7S & 7.7W ALEXANDRIA, Hanson, SD

Built 1982 Load: 19.1 t ADT: 45

41440 267 STREET

Poor

Over: TWELVE MILE CK

2.0 S & 3.4 E ETHAN, Hanson, SD

Built 1982 Load: 19.1 t ADT: 45

26990 407 AVE

Poor

Over: SOUTH FORK TWELVE MILE C

3 W DIMOCK S.D., Hutchinson, SD

Built 1984 Load: 19.1 t ADT: 45

27140 417 AVE.

Poor

Over: SOUTH FORK TWELVE MILE C

6 E 3.6 N PARKSTON, Hutchinson, SD

Built 1983 Load: 19.1 t ADT: 45

28430 420 AVE.

Poor

Over: LONETREE CK

4 W 1.7 N HYS 18 &25, Hutchinson, SD

Built 1984 Load: 19.1 t ADT: 45

28550 421 AVE.

Poor

Over: CK

5 W & 0.5 N OLIVET, Hutchinson, SD

Built 1978 Load: 19.1 t ADT: 69

28450 423 AVE

Poor

Over: LONETREE CK

1.5N,3.0W OF OLIVET, Hutchinson, SD

Built 1985 Load: 19.1 t ADT: 69

43290 288 ST.

Poor

Over: CK

2 S & 1.9 E MENNO, Hutchinson, SD

Built 1930 Load: 19.1 t ADT: 25

CAMP COMFORT ROAD

Poor

Over: SPEARFISH CK

1.5N SPEARFISH, Lawrence, SD

Built 1975 Load: 19.1 t ADT: 500

COUNTY RD 014B

Poor

Over: MILLER CK

.2 W JCT US85S -SPEARFISH, Lawrence, SD

Built 1934 Load: 19.1 t ADT: 2,000

COUNTY HIGHWAY #7

Poor

Over: COTTONWOOD CK

5W & 4.2N WHITE RV, Mellette, SD

Built 1982 Load: 19.1 t ADT: 9

HAYNES ROAD

Poor

Over: LODGE POLE CK

4W 13.9S WHITE BUTTE, Perkins, SD

Built 1980 Load: 19.1 t ADT: 26

HIDDEN TIMBER ROAD

Poor

Over: ANTELOPE CK

9 E 3.8 S MISSION, Todd, SD

Built 1951 Load: 19.1 t ADT: 128

27490 462 AVE

Poor

Over: LONG CK

2.1N & 1E CHANCELLOR, Turner, SD

Built 1945 Load: 19.1 t ADT: 65

39280 284 ST

Poor

Over: BR CHOTEAU CK

8.2 W. OF DELMONT, Douglas, SD

Built 1925 Load: 19.3 t ADT: 330

250TH ST, HWY 114

Poor

Over: SLIP-UP CREEK

4.2E BALTIC, Minnehaha, SD

Built 1956 Load: 19.3 t ADT: 965

FAIRPOINT RD.

Poor

Over: CK

34.5E&17.7N STURGIS, Meade, SD

Built 1962 Load: 19.4 t ADT: 65

47400 302 ST.

Poor

Over: WEST BRULE CK

4.8W & 1S ALCESTER, Union, SD

Built 1960 Load: 19.5 t ADT: 435

202ND STREET

Poor

Over: BIG SIOUX RV

1.25N & 0.4W BRUCE, Brookings, SD

Built 1970 Load: 19.6 t ADT: 92

199TH STREET

Poor

Over: BIG SIOUX RV

13N & 4.1W BROOKINGS, Brookings, SD

Built 1970 Load: 19.6 t ADT: 92

214TH STREET

Poor

Over: CK

2S & 3.3W BROOKINGS, Brookings, SD

Built 1962 Load: 19.6 t ADT: 64

214TH STREET

Poor

Over: CK

2S & 2.3W BROOKINGS, Brookings, SD

Built 1974 Load: 19.6 t ADT: 63

216TH STREET

Poor

Over: CK

4S & 1.7W BROOKINGS, Brookings, SD

Built 1935 Load: 19.6 t ADT: 597

WESTERN AVE.

Poor

Over: CK

WESTERN AVE - BROOKINGS, Brookings, SD

Built 1932 Load: 19.6 t ADT: 1,356

207TH STREET

Poor

Over: CK

4N & 1.8W BUSHNELL, Brookings, SD

Built 1974 Load: 19.6 t ADT: 75

477TH AVENUE

Poor

Over: MEDARY CK

1E & 0.6S AURORA, Brookings, SD

Built 1968 Load: 19.6 t ADT: 92

482ND AVENUE

Poor

Over: CK

7.1N & 4W ELKTON, Brookings, SD

Built 1973 Load: 19.6 t ADT: 137

482ND AVENUE

Poor

Over: CK

4W & 2.9N ELKTON, Brookings, SD

Built 1950 Load: 19.6 t ADT: 89

220TH STREET

Poor

Over: CK

3S & 0.9W ELKTON, Brookings, SD

Built 1941 Load: 19.6 t ADT: 92

487TH AVENUE

Poor

Over: CK

1E & 0.5N OF ELKTON, Brookings, SD

Built 1993 Load: 19.6 t ADT: 92

45530 306 STREET

Poor

Over: CK

4S & 0.4E WAKONDA, Clay, SD

Built 1971 Load: 19.6 t ADT: 147

46320 306 ST.

Poor

Over: VERMILLION RV

1.8W HUB CITY, Clay, SD

Built 1970 Load: 19.6 t ADT: 150

399TH AVENUE

Poor

Over: NORTH BR TWELVE MILE CK

12 W & 0.4 N ETHAN, Davison, SD

Built 1972 Load: 19.6 t ADT: 71

403RD AVENUE

Poor

Over: DRY RUN CK

1.8 N & 2.0 W LOOMIS, Davison, SD

Built 1945 Load: 19.6 t ADT: 64

403RD AVENUE

Poor

Over: FIRESTEEL CK

2.0W 1.5S LOOMIS, Davison, SD

Built 1910 Load: 19.6 t ADT: 390

259TH STREET

Poor

Over: ENEMY CK

5 S & 5.8 W MITCHELL, Davison, SD

Built 1970 Load: 19.6 t ADT: 64

260TH STREET

Poor

Over: ENEMY CK

5.0N 7.2W ETHAN, Davison, SD

Built 1917 Load: 19.6 t ADT: 25

404TH AVENUE

Poor

Over: ENEMY CK

5 W & 5.8 S MITCHELL, Davison, SD

Built 1935 Load: 19.6 t ADT: 15

409TH AVE

Poor

Over: NORTH BR TWELVE MILE CK

2.3 N & 2 W ETHAN, Davison, SD

Built 1945 Load: 19.6 t ADT: 64

345TH AVE

Poor

Over: CK

3.7W & 9.4S REE HEIGHTS, Hand, SD

Built 1930 Load: 19.6 t ADT: 43

GREEN VALLEY RD

Poor

Over: CK

5.8S & 1.7W REE HEIGHTS, Hand, SD

Built 1920 Load: 19.6 t ADT: 43

198TH ST

Poor

Over: CK

REE HEIGHTS, Hand, SD

Built 1930 Load: 19.6 t ADT: 30

202ND ST

Poor

Over: CK

4S & 2.9W MILLER, Hand, SD

Built 1928 Load: 19.6 t ADT: 10

193RD ST

Poor

Over: CK

4N & 0.9W MILLER, Hand, SD

Built 1930 Load: 19.6 t ADT: 43

W. 2ND ST

Poor

Over: REE CK

MILLER, Hand, SD

Built 1914 Load: 19.6 t ADT: 10

258TH ST, HWY 130

Poor

Over: WILLOW CK

5.6W RENNER, Minnehaha, SD

Built 1979 Load: 19.6 t ADT: 878

LAMESA DR, HWY 137

Poor

Over: TRIB TO SKUNK CK

0.4S & 1E ELLIS, Minnehaha, SD

Built 1982 Load: 19.6 t ADT: 1,492

Showing 5,351-5,400 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.