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

45650 275 ST

Poor

Over: EAST FORK VERMILLION RV

3.5E PARKER, Turner, SD

Built 1958 Load: 16.1 t ADT: 747

W 23RD STREET

Poor

Over: MARNE CREEK

W 23RD STREET - YANKTON, Yankton, SD

Built 1976 Load: 16.1 t ADT: 3,980

41590 289 ST.

Poor

Over: Dawson Creek

2 S & 4.5 E TRIPP, Hutchinson, SD

Built 1937 Load: 16.2 t ADT: 45

203 A STREET

Poor

Over: SIX MILE CK

1.2W WHITE, Brookings, SD

Built 1940 Load: 16.3 t ADT: 92

STATE PARK RD

Poor

Over: CENTER LAKE INLET

8.4E 2.7N OF CUSTER, Custer, SD

Built 1950 Load: 16.3 t ADT: 1,000

STATE PARK RD

Poor

Over: CK

10.8E 1S CUSTER, Custer, SD

Built 1950 Load: 16.3 t ADT: 5

TWNSHP RD 483RD AV

Poor

Over: CK

7E & 5.6N TUNERVILLE, Deuel, SD

Built 1930 Load: 16.3 t ADT: 25

39530 271 ST

Poor

Over: CK

2.0N,6.3E OF CORSICA, Douglas, SD

Built 1980 Load: 16.3 t ADT: 25

147 STREET

Poor

Over: CK

6.5W & 2N MILBANK, Grant, SD

Built 1926 Load: 16.3 t ADT: 100

477 AVENUE

Poor

Over: CK

5W & 4.9N ALBEE, Grant, SD

Built 1965 Load: 16.3 t ADT: 18

480 AVENUE

Poor

Over: CK

2W & 4.1N ALBEE, Grant, SD

Built 1969 Load: 16.3 t ADT: 35

482 AVENUE

Poor

Over: NORTH FORK YELLOW BANK R

8.3N ALBEE, Grant, SD

Built 1930 Load: 16.3 t ADT: 258

357TH AVE

Poor

Over: CK

3W & 4.1 S MILLER, Hand, SD

Built 1926 Load: 16.3 t ADT: 10

281st Street

Poor

Over: Long Creek

2S & 0.3E of Lennox, Lincoln, SD

Built 1935 Load: 16.3 t ADT: 45

HAMMERQUIST ROAD

Poor

Over: RAPID CK

1.2W,0.5N,FARMINGDALE, Pennington, SD

Built 1916 Load: 16.3 t ADT: 54

467th Avenue

Poor

Over: Creek

0.6N of Wilmot, Roberts, SD

Built 1968 Load: 16.3 t ADT: 165

476th Avenue

Poor

Over: Big Slough Creek

3E & 1.4N of Rosholt, Roberts, SD

Built 1930 Load: 16.3 t ADT: 22

477th Avenue

Poor

Over: Big Slough Creek

4E & 1.1N of Rosholt, Roberts, SD

Built 1955 Load: 16.3 t ADT: 22

I-90 SERVICE ROAD

Poor

Over: SPRING CK

2.5 MI. SE WHITEWOOD, Lawrence, SD

Built 1938 Load: 16.5 t ADT: 335

242nd Street

Poor

Over: Big Sioux River

2.4S of Trent, Moody, SD

Built 1983 Load: 16.5 t ADT: 20

257TH STREET

Poor

Over: TRIB TO BEAVER CK

2.7E & 4S GARRETSON, Minnehaha, SD

Built 1935 Load: 16.6 t ADT: 30

MOCCASIN PARK RD

Poor

Over: WHITE CLAY CREEK

0.36 KM W OF SH 407, Oglala Lakota, SD

Built 1975 Load: 16.9 t ADT: 50

485TH AVENUE

Poor

Over: CK

1.5N & 7E WHITE, Brookings, SD

Built 1950 Load: 17.0 t ADT: 139

165TH ST

Poor

Over: James River

1.6 E. ASHTON, Spink, SD

Built 1955 Load: 17.0 t ADT: 146

401ST AVENUE

Poor

Over: NORTH BR TWELVE MILE CK

10 W & 1.2 N ETHAN, Davison, SD

Built 1925 Load: 17.1 t ADT: 53

38830 280 ST

Poor

Over: ANDES CK

0.5N 3.7W ARMOUR, Douglas, SD

Built 1950 Load: 17.1 t ADT: 206

25810 416 AVENUE

Poor

Over: JAMES RV

1.1S & 5W OF ALEXANDRIA, Hanson, SD

Built 1959 Load: 17.1 t ADT: 165

27440 BENSEN ROAD

Poor

Over: DRY CK

9.5E&0.6N PARKSTON, Hutchinson, SD

Built 1980 Load: 17.1 t ADT: 35

45670 273 ST

Poor

Over: ELCE CK

2N & 3.7E PARKER, Turner, SD

Built 1945 Load: 17.1 t ADT: 30

27380 458 AVE

Poor

Over: CAMP CK

1.1N & 5E PARKER, Turner, SD

Built 1930 Load: 17.1 t ADT: 31

31270 473RD AVE

Poor

Over: BRULE CK

1E & 14.7S BERESFORD, Union, SD

Built 1976 Load: 17.1 t ADT: 30

47320 304 STR

Poor

Over: CK

6S & 1.2E BERESFORD, Union, SD

Built 1970 Load: 17.1 t ADT: 43

48030 310 STR.

Poor

Over: EAST UNION CK

8.5S & 1.3E ALCESTER, Union, SD

Built 1948 Load: 17.1 t ADT: 40

44660 298th Street

Poor

Over: Trib. to Clay Creek

5.4W & 1S of Irene, Yankton, SD

Built 1940 Load: 17.1 t ADT: 25

148 STREET

Poor

Over: BIG SIOUX RV

13.9W & 1.5S MARVIN, Grant, SD

Built 1930 Load: 17.2 t ADT: 52

476TH AVENUE

Poor

Over: SIX MILE CK

1.4S & 2W WHITE, Brookings, SD

Built 1950 Load: 17.3 t ADT: 92

30010 400th Avenue

Poor

Over: Choteau Creek

0.1S of Dante, Charles Mix, SD

Built 1958 Load: 17.4 t ADT: 205

IGLOO RD

Poor

Over: COAL CK

0.1 E IGLOO (SD298), Fall River, SD

Built 1940 Load: 17.5 t ADT: 20

487TH AVENUE

Poor

Over: TRIB TO BEAVER CK

2.1N VALLEY SPRINGS, Minnehaha, SD

Built 1958 Load: 17.6 t ADT: 39

352 AVENUE

Poor

Over: WILLOW CK

5.2S & 2E HERRICK, Gregory, SD

Built 1956 Load: 17.7 t ADT: 36

28220 432 AVE.

Poor

Over: CK

3.8N,1.0E OF MENNO, Hutchinson, SD

Built 1981 Load: 17.7 t ADT: 15

221ST STREET

Poor

Over: JAMES RV

3.4E JCT SD37 & SD32, Sanborn, SD

Built 1957 Load: 17.8 t ADT: 176

347TH AVE

Poor

Over: CK

8.5S & 2W REE HEIGHTS, Hand, SD

Built 1910 Load: 17.9 t ADT: 43

TWNSHP RD 484TH AV

Poor

Over: COBB CK

3.4 S 3.0 W GARY, Deuel, SD

Built 1945 Load: 18.0 t ADT: 10

269 STREET

Poor

Over: EAGLE NEST CK

4S & 2.4W WANBLEE, Jackson, SD

Built 1945 Load: 18.0 t ADT: 15

14TH AVE. N, WTN.

Poor

Over: BIG SIOUX RV

2 N 1.2W WATERTOWN, Codington, SD

Built 1974 Load: 18.1 t ADT: 4,970

455 AVENUE

Poor

Over: MAHONEY CK

3.3 S JCT SD 20 E, Codington, SD

Built 1940 Load: 18.1 t ADT: 1,167

485 AVENUE

Poor

Over: NORTH FORK YELLOW BANK R

7E & 4.6S MILBANK, Grant, SD

Built 1930 Load: 18.1 t ADT: 35

449 AVE

Poor

Over: CK

2.0 W ORLAND, Lake, SD

Built 1930 Load: 18.1 t ADT: 290

387th Avenue

Poor

Over: Creek

6.5S of Wolsey, Beadle, SD

Built 1922 Load: 18.2 t ADT: 56

Showing 5,251-5,300 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.