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

THUNDERHEAD FALLS

Poor

Over: RAPID CK

1.0E 2.0S JOHNSON SD, Pennington, SD

Built 1972 Load: 33.3 t ADT: 62

159TH ST

Poor

Over: CREEK

5.0S 0.5W NORTHVILLE, Spink, SD

Built 1930 Load: 34.0 t ADT: 12

328TH AVENUE

Poor

Over: SOUTH MEDICINE CK

1.2 S HOLABIRD, Hyde, SD

Built 1967 Load: 34.3 t ADT: 90

SD011

Poor

Over: WEST PIPESTONE CK

2.9 N I 90 INTERCH, Minnehaha, SD

Built 1953 Load: 34.6 t ADT: 3,797

CHAPEL LANE

Poor

Over: RAPID CK

CHAPEL LANE & SD44 - RC, Pennington, SD

Built 1974 Load: 35.8 t ADT: 4,700

464TH AVENUE

Poor

Over: CK

5.9S VOLGA, Brookings, SD

Built 1950 Load: 35.9 t ADT: 198

361ST AVE

Poor

Over: NORTH FORK SNAKE CK

0.5W & 0.1S CRESBARD, Faulk, SD

Built 1979 Load: 35.9 t ADT: 136

258TH ST, HWY 130

Poor

Over: BIG SIOUX RIVER

1.6W RENNER, Minnehaha, SD

Built 1966 Load: 36.0 t ADT: 2,419

IRR US012

Poor

Over: CLAYMORE CK

2.4 W WALWORTH CO LINE, Corson, SD

Built 1958 Load: 37.2 t ADT: 1,392

THUNDERHEAD FALLS

Poor

Over: RAPID CK

1.2E 1.4S JOHNSON SIDING, Pennington, SD

Built 1972 Load: 38.8 t ADT: 218

US014

Poor

Over: JAMES RV

1.3 E JCT SD 37, Beadle, SD

Built 1960 Load: 40.7 t ADT: 3,619

SD037

Poor

Over: MISSOURI RIVER

1.5NE NIOBRARA, Bon Homme, SD

Built 1996 Load: 42.6 t ADT: 830

Benson Road

Poor

Over: Big Sioux Diversion

east of Minnesota Avenue, Minnehaha, SD

Built 1999 Load: 45.2 t ADT: 9,273

47460 304 STR.

Poor

Over: BRULE CK

6S & 2.6E BERESFORD, Union, SD

Built 1987 Load: 45.5 t ADT: 40

US385

Poor

Over: HORSE CK

3.6 N JCT US 16 E, Pennington, SD

Built 1947 Load: 49.9 t ADT: 2,610

SD022

Poor

Over: CK

5.3 E I 29 INTERCH, Deuel, SD

Built 1959 Load: 50.9 t ADT: 1,723

SD049

Poor

Over: CK

7 S OF HAMILL, Tripp, SD

Built 1972 Load: 51.5 t ADT: 509

31160 UNIVER. ROAD

Poor

Over: VERMILLION RV

1.2E & 6N VERMILLION, Clay, SD

Built 1973 Load: 51.6 t ADT: 297

ARPAN RD

Poor

Over: SOUTH CANAL

11 WEST NEWELL, Butte, SD

Built 1975 Load: 52.9 t ADT: 269

29020 453 AVE

Poor

Over: CK

3W & 0.8N VIBORG, Turner, SD

Built 1999 Load: 59.1 t ADT: 100

US014A

Poor

Over: ICE BOX CK

0.2 E CHEYENNE XING, Lawrence, SD

Built 1964 Load: 61.7 t ADT: 1,447

47320 305 STR

Poor

Over: BRULE CK

7S & 2.2E BERESFORD, Union, SD

Built 1989 Load: 64.4 t ADT: 40

212TH STREET

Poor

Over: CK

1S & 3.7E VOLGA, Brookings, SD

Built 1930 Load: 65.7 t ADT: 92

US012

Poor

Over: CK

4.2 E OF IPSWICH, Edmunds, SD

Built 1974 Load: 67.6 t ADT: 2,882

29895 BOYER AVE

Poor

Over: CK

12.5E & 0.9S BERESFORD, Union, SD

Built 1992 Load: 81.3 t ADT: 70

700 S. DAKOTA AVE.

Poor

Over: VERMILLION RV

1.0S CNT VERMILLION, Clay, SD

Built 1975 Load: 81.6 t ADT: 550

210TH STREET

Poor

Over: CK

7N & 1.3W ELKTON, Brookings, SD

Built 1930 Load: 89.8 t ADT: 92

IRR SD034

Poor

Over: CAMPBELL CK

0.4 N BUFFALO CO LINE, Hyde, SD

Built 1963 Load: 99.9 t ADT: 874

395th Avenue

Structurally Deficient

Over: Cain Creek

8.6S & 5W of Huron, Beadle, SD

Built 1926 ADT: 56

216 ST

Structurally Deficient

Over: SOUTH FORK PEARL CK

8.0S 1.5W CAVOUR, Beadle, SD

Built 1924 ADT: 56

200TH ST

Structurally Deficient

Over: SHUE CK

8N 0.8E CAVOUR, Beadle, SD

Built 1912 ADT: 56

412th Avenue

Structurally Deficient

Over: Middle Pearl Creek

5.1S & 3E of Cavour, Beadle, SD

Built 1930 ADT: 56

41480 299th Street

Structurally Deficient

Over: Emanuel Creek

4N & 1.2W of Tyndall, Bon Homme, SD

Built 1905 ADT: 20

GAVER ROAD

Structurally Deficient

Over: REDWATER RV

1.5S 1.5E B. FOURCHE, Butte, SD

Built 1920 ADT: 47

38930 302 ST

Structurally Deficient

Over: CK

9.0S,1.3E OF RAVINA, Charles Mix, SD

Built 1941 ADT: 48

46080 314 ST.

Structurally Deficient

Over: CLAY CK DITCH

3.5N & 3.2W VERMILLION, Clay, SD

Built 1900 ADT: 97

46530 314TH ST.

Structurally Deficient

Over: VERMILLION RV

3.5N & 1.3E VERMILLION, Clay, SD

Built 1930 ADT: 97

46540 307TH ST.

Structurally Deficient

Over: BAPTIST CK

10S & 13.4E IRENE, Clay, SD

Built 1940 ADT: 97

29830 ASH CRK AVE.

Structurally Deficient

Over: ASH CK

1.3S & 13.5E IRENE, Clay, SD

Built 1945 ADT: 25

46580 313 ST.

Structurally Deficient

Over: VERMILLION RV

7.0 S & 0.6 E HUB CITY, Clay, SD

Built 1910 ADT: 40

29810 466 ST.

Structurally Deficient

Over: ASH CK

1.2S & 14E IRENE, Clay, SD

Built 1940 ADT: 5

12590-416TH AVENUE

Structurally Deficient

Over: CK

3W & 4.IN PIERPONT, Day, SD

Built 1932 ADT: 70

476 AVE

Structurally Deficient

Over: CK

2.0W & 5.1S MILBANK, Grant, SD

Built 1901 ADT: 20

179 STREET

Structurally Deficient

Over: STRAY HORSE CK

4.9E & 4N CASTLEWOOD, Hamlin, SD

Built 1910 ADT: 5

368 AVE

Structurally Deficient

Over: WOLF CK

8 E & 9.9 N MILLER, Hand, SD

Built 1915 ADT: 10

27490 416 AVE.

Structurally Deficient

Over: PONY CK

2.1N,6.0E PARKSTON, Hutchinson, SD

Built 1986 ADT: 25

211 AVENUE

Structurally Deficient

Over: WHITEWATER CK

2E & 4S COTTONWOOD, Jackson, SD

Built 1940 ADT: 14

CHRISTENSEN ROAD

Structurally Deficient

Over: FALSE BOTTOM CK

Int Christensen Maitland, Lawrence, SD

Built 1970 ADT: 100

900006: PETERSON

Structurally Deficient

Over: Whitewood Creek

2 mi S of Lead, SD, Lawrence, SD

Built 2011 ADT: 25

465TH AVENUE

Structurally Deficient

Over: BLIND CK

6W & 2.5N BERESFORD, Lincoln, SD

Built 1935 ADT: 35

Showing 5,601-5,650 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.