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

41760 248 STREET

Fair

Over: ROCK CK

4 N & 1.4 W FULTON, Hanson, SD

Built 1930 Load: 24.5 t ADT: 35

41800 247 STREET

Fair

Over: ROCK CK

3 E OF PLANO, Hanson, SD

Built 1965 Load: 24.5 t ADT: 245

24550 419 AVENUE

Fair

Over: ROCK CK

6.5 N FULTON, Hanson, SD

Built 1968 Load: 24.5 t ADT: 120

42350 255 STREET

Fair

Over: PIERRE CK

3.0 S & 4.5 E FULTON, Hanson, SD

Built 1992 Load: 24.5 t ADT: 60

26760 426 AVENUE

Fair

Over: PLUM CK

5E&10.6S ALEXANDRIA, Hanson, SD

Built 1962 Load: 24.5 t ADT: 35

42890 258 STREET

Fair

Over: WOLF CK

3 N & 0.1 W EMERY, Hanson, SD

Built 1961 Load: 24.5 t ADT: 60

CAMP CROOK ROAD

Fair

Over: CK

12.5 SOUTH CAMP CROOK, Harding, SD

Built 1985 Load: 24.5 t ADT: 180

COUNTY RD

Fair

Over: KATY CK

12.9 W 0.3 N REDIG, Harding, SD

Built 1961 Load: 24.5 t ADT: 36

HARDING RD

Fair

Over: SOUTH FORK MOREAU RV

11.5 W 2.5 S REDIG, Harding, SD

Built 1961 Load: 24.5 t ADT: 22

CAVE HILL RD

Fair

Over: BULL CK

6 E 2 S LADNER, Harding, SD

Built 1977 Load: 24.5 t ADT: 131

198 STREET

Fair

Over: SOUTH MEDICINE CK

1.0S & 3.8W HARROLD, Hughes, SD

Built 1969 Load: 24.5 t ADT: 44

319 AVENUE

Fair

Over: SOUTH MEDICINE CK

2.0W & 1.3S HARROLD, Hughes, SD

Built 1964 Load: 24.5 t ADT: 33

322 AVENUE

Fair

Over: SOUTH MEDICINE CK

1.0E & 1.5S HARROLD, Hughes, SD

Built 1968 Load: 24.5 t ADT: 33

27579 408 AVE.

Fair

Over: CK

2 W & 0.1 N PARKSTON, Hutchinson, SD

Built 1939 Load: 24.5 t ADT: 150

27620 409 AVE.

Fair

Over: PONY CK

0.2S,1.0W PARKSTON, Hutchinson, SD

Built 1941 Load: 24.5 t ADT: 25

TOWN STREET

Fair

Over: PONY CK

MAPLE ST PARKSTON, Hutchinson, SD

Built 2011 Load: 24.5 t ADT: 61

41040 287 STR.

Fair

Over: CK

1.0 W TRIPP, Hutchinson, SD

Built 1967 Load: 24.5 t ADT: 92

FIRST STREET

Fair

Over: PONY CK

FIRST ST PARKSTON, Hutchinson, SD

Built 1970 Load: 24.5 t ADT: 61

41080 277 ST.

Fair

Over: NORTH BR DRY CK

1.0S,0.8E PARKSTON, Hutchinson, SD

Built 1974 Load: 24.5 t ADT: 23

288th ST

Fair

Over: CK

0.5S & 0.1W of Tripp, Hutchinson, SD

Built 1967 Load: 24.5 t ADT: 85

28310 411 AVE.

Fair

Over: SOUTH BR LONETREE CK

3.9 N TRIPP, Hutchinson, SD

Built 1962 Load: 24.5 t ADT: 69

413 AVE

Fair

Over: DAWSON CK

2E of Tripp, Hutchinson, SD

Built 1936 Load: 24.5 t ADT: 45

287 ST

Fair

Over: DAWSON CK

0.1N & 2E of Tripp, Hutchinson, SD

Built 1937 Load: 24.5 t ADT: 45

27850 415 AVE.

Fair

Over: SOUTH BR DRY CK

4E&2.5S PARKSTON SD, Hutchinson, SD

Built 1935 Load: 24.5 t ADT: 69

28090 418 AVE.

Fair

Over: LONETREE CK

9.1 N KAYLOR, Hutchinson, SD

Built 1935 Load: 24.5 t ADT: 88

41850 278 ST.

Fair

Over: DRY CK

2.0S,8.5E PARKSTON, Hutchinson, SD

Built 2008 Load: 24.5 t ADT: 25

28830 421 AVE.

Fair

Over: SOUTH BR LONETREE CK

9.6E & 1.3S TRIPP, Hutchinson, SD

Built 1939 Load: 24.5 t ADT: 69

27464 424 AVE.

Fair

Over: CK

3.0W & 2.4S OF CLAYTON, Hutchinson, SD

Built 1929 Load: 24.5 t ADT: 125

27520 424 AVE.

Fair

Over: JAMES RV

13.1E & 0.2S OF PARKSTON, Hutchinson, SD

Built 1941 Load: 24.5 t ADT: 145

29010 425 AVE.

Fair

Over: CK

4.2S,1.0W OF OLIVET, Hutchinson, SD

Built 1989 Load: 24.5 t ADT: 45

341 AVENUE

Fair

Over: SOUTH MEDICINE CK

4E 3.5S HIGHMORE, Hyde, SD

Built 1967 Load: 24.5 t ADT: 47

GRINDSTONE ROAD

Fair

Over: COTTONWOOD CK

2W & 0.8N COTTONWOOD, Jackson, SD

Built 1976 Load: 24.5 t ADT: 41

FAIRVIEW ROAD

Fair

Over: COTTONWOOD CK

2E & 0.6S COTTONWOOD, Jackson, SD

Built 1976 Load: 24.5 t ADT: 12

LONG VALLEY ROAD

Fair

Over: PASS CK

4.2E LONG VALLEY, Jackson, SD

Built 1969 Load: 24.5 t ADT: 60

221 STREET

Fair

Over: CK

7N & 0.2W WESSNGTN SPRNGS, Jerauld, SD

Built 1966 Load: 24.5 t ADT: 90

382 AVENUE

Fair

Over: CK

7N WESSINGTON SPR., Jerauld, SD

Built 1966 Load: 24.5 t ADT: 270

235 STREET

Fair

Over: FIRESTEEL CK

6 S 2 W LANE, Jerauld, SD

Built 1970 Load: 24.5 t ADT: 25

258th Avenue

Fair

Over: Bad River

12W & 14.8N of Murdo, Jones, SD

Built 1984 Load: 24.5 t ADT: 25

218 ST

Fair

Over: LK THOMPSON OUTLET

S END LK THOMPSON, Kingsbury, SD

Built 1988 Load: 24.5 t ADT: 415

215TH STREET

Fair

Over: CK

3 N & 2.6 W OLDHAM, Kingsbury, SD

Built 1987 Load: 24.5 t ADT: 75

442A AVE

Fair

Over: EAST FORK VERMILLION RV

4.2N & 0.2E WINFRED, Lake, SD

Built 1939 Load: 24.5 t ADT: 165

230 ST

Fair

Over: EAST FORK VERMILLION RV

3.3N & .6E WINFRED, Lake, SD

Built 1938 Load: 24.5 t ADT: 35

236 ST

Fair

Over: EAST FORK VERMILLION RV

3E & 2.7S WINFRED, Lake, SD

Built 1987 Load: 24.5 t ADT: 25

451 AVE

Fair

Over: CK

4W & .2N MADISON, Lake, SD

Built 1932 Load: 24.5 t ADT: 220

231 ST

Fair

Over: CK

2N & 3.2W MADISON, Lake, SD

Built 1940 Load: 24.5 t ADT: 55

414 NE SECOND STR

Fair

Over: MADISON CK

0.1E JCT SD19 S - MADISON, Lake, SD

Built 1959 Load: 24.5 t ADT: 7,576

456 AVE

Fair

Over: BATTLE CK

6.2N MADISON, Lake, SD

Built 1941 Load: 24.5 t ADT: 91

227 ST

Fair

Over: BATTLE CK

6N & 0.1E MADISON, Lake, SD

Built 1935 Load: 24.5 t ADT: 55

228 ST

Fair

Over: BATTLE CK

5N & 1.4E MADISON, Lake, SD

Built 1930 Load: 24.5 t ADT: 143

457 AVE

Fair

Over: BATTLE CK

1E & 3.5N MADISON, Lake, SD

Built 1935 Load: 24.5 t ADT: 91

Showing 1,401-1,450 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.