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

259TH, 85TH ST N

Poor

Over: SILVER CK

1S RENNER, Minnehaha, SD

Built 1970 Load: 19.6 t ADT: 32

JASPER ST, HWY 104

Poor

Over: TRIB TO BIG SIOUX RV

1.2E & 0.2N DELL RAPIDS, Minnehaha, SD

Built 1922 Load: 19.6 t ADT: 994

JASPER ST, HWY 104

Poor

Over: TRIB TO BIG SIOUX RV

1.5E & 0.2N DELL RAPIDS, Minnehaha, SD

Built 1938 Load: 19.6 t ADT: 974

483RD AVENUE

Poor

Over: TRIB TO SPLIT ROCK CK

1.1N & 1E CORSON, Minnehaha, SD

Built 1938 Load: 19.6 t ADT: 46

487TH AVE, HWY 103

Poor

Over: TRIB TO SPLIT ROCK CK

2E & 0.4N GARRETSON, Minnehaha, SD

Built 1977 Load: 19.6 t ADT: 398

26930 442 AVE

Poor

Over: CK

3.7N & 5W MARION, Turner, SD

Built 1950 Load: 19.6 t ADT: 10

28010 453 AVE

Poor

Over: CK

4.1S PARKER, Turner, SD

Built 1940 Load: 19.6 t ADT: 50

44930 295 ST

Poor

Over: Turkey Creek

2 N & 2.7 W Irene, Yankton, SD

Built 1991 Load: 19.6 t ADT: 75

431st Avenue

Poor

Over: Wolf Creek

4W & 1.5N of Bridgewater, McCook, SD

Built 1952 Load: 19.8 t ADT: 98

266 ST, IDEAL RD

Poor

Over: DOG EAR CK

1.9W IDEAL, Tripp, SD

Built 1955 Load: 19.8 t ADT: 50

162 STREET

Poor

Over: BIG SIOUX RV

7.5E & 1S FLORENCE, Codington, SD

Built 1985 Load: 20.0 t ADT: 40

US014

Poor

Over: MISSOURI RV

HUGHES - STANLEY CO LINE, Hughes, SD

Built 1962 Load: 20.0 t ADT: 15,450

SUMMERSET DRIVE

Poor

Over: DITCH

50' E SHERIDAN LAKE ROAD, Pennington, SD

Built 1984 Load: 20.1 t ADT: 250

208TH ST

Poor

Over: SOUTH FORK PEARL CK

OSEWAGO ST. IROQUIS, Kingsbury, SD

Built 1933 Load: 20.2 t ADT: 913

408TH AVE

Poor

Over: CREEK

2E & 1.9S DOLAND, Spink, SD

Built 1935 Load: 20.2 t ADT: 31

365TH AVE

Poor

Over: DOVE CK

4E & 0.3S MIRANDA, Faulk, SD

Built 1929 Load: 20.3 t ADT: 36

207TH STREET

Poor

Over: CK

10N & 1.9W ELKTON, Brookings, SD

Built 1950 Load: 20.4 t ADT: 65

39120 305th Street

Poor

Over: Mosquito Creek

8.0S & 3.8W of Wagner, Charles Mix, SD

Built 1920 Load: 20.8 t ADT: 48

I090 WF

Poor

Over: R&W RR

0.7 W OACOMA INTERCH, Lyman, SD

Built 1953 Load: 20.8 t ADT: 2,622

305th Street

Poor

Over: Emanuel Creek

1S & 2.8W of Tyndall, Bon Homme, SD

Built 1970 Load: 20.9 t ADT: 60

TENTH AVENUE

Poor

Over: SOUTH FORK SNAKE CK

TENTH AVE. FAULKTON, Faulk, SD

Built 1932 Load: 20.9 t ADT: 50

IRR BIA RTE 7

Poor

Over: LITTLE WHITE RIVER

AT GHOST HAWK PARK, Todd, SD

Built 1972 Load: 20.9 t ADT: 1,851

364TH AVE

Poor

Over: BRYANT CK

8W & 1.4N ZELL, Faulk, SD

Built 1928 Load: 21.0 t ADT: 36

TIMM LN

Poor

Over: WHITEWOOD CK

TIMM LN - DEADWOOD, Lawrence, SD

Built 1901 Load: 21.0 t ADT: 10

261ST STREET

Poor

Over: TRIB TO BEAVER CK

1N & 0.6E VALLEY SPRINGS, Minnehaha, SD

Built 1935 Load: 21.1 t ADT: 62

397TH AVE.

Poor

Over: MORRIS CK

7.1S WOONSOCKET, Sanborn, SD

Built 1930 Load: 21.3 t ADT: 225

IRR BIA RTE 5

Poor

Over: LITTLE WHITE RIVER

5 KM N SPRING CR SCHOOL, Todd, SD

Built 1967 Load: 21.6 t ADT: 1,050

IRR BIA RTE 11

Poor

Over: ROSEBUD CREEK

ROSEBUD STREET IN ROSEBUD, Todd, SD

Built 1971 Load: 21.6 t ADT: 114

OAK STREET

Poor

Over: WILLOW CK

5.2E 3.5N WATERTOWN, Codington, SD

Built 1988 Load: 21.8 t ADT: 60

IRR BIA RTE 7

Poor

Over: NO MOUTH CREEK

25.7 KM NO. OF US HWY 212, Dewey, SD

Built 1960 Load: 21.8 t ADT: 70

475 AVENUE

Poor

Over: CK

3W & 0.9S MILBANK, Grant, SD

Built 1965 Load: 21.8 t ADT: 75

314 AVENUE

Poor

Over: CHAPELLE CK

15.5S & 6.4W HARROLD, Hughes, SD

Built 1961 Load: 21.8 t ADT: 33

246TH ST, HWY 104

Poor

Over: SKUNK CK

2N & 4.4E COLTON, Minnehaha, SD

Built 1953 Load: 21.8 t ADT: 1,135

27130 445 AVE

Poor

Over: CK

1.7N & 2W MARION, Turner, SD

Built 1950 Load: 21.8 t ADT: 100

355th Avenue

Poor

Over: Crow Creek

5W & 2.5S of Gann Valley, Buffalo, SD

Built 1975 Load: 22.0 t ADT: 55

466th Avenue

Poor

Over: Saddle Creek

3.2S of Jct. US Hwy 18, Lincoln, SD

Built 1964 Load: 22.0 t ADT: 495

164TH STREET

Poor

Over: TIMBER CREEK

8N & 4.2W DOLAND, Spink, SD

Built 1935 Load: 22.0 t ADT: 9

182ND STREET

Poor

Over: CREEK

10S & 5.2E DOLAND, Spink, SD

Built 1967 Load: 22.0 t ADT: 29

258TH ST, HWY 130

Poor

Over: SKUNK CREEK

1N & 1.9E HARTFORD, Minnehaha, SD

Built 1977 Load: 22.1 t ADT: 589

148TH ST

Poor

Over: MUD CREEK

4.5 W RANDOLPH, Spink, SD

Built 1977 Load: 22.4 t ADT: 146

IRR BIA RTE 5

Poor

Over: LITTLE WHITE RIVER

18.4 KM NE SPRING CR SCHL, Todd, SD

Built 1967 Load: 22.8 t ADT: 1,050

471ST AVENUE

Poor

Over: BR NORTH DEER CK

5.9N BROOKINGS, Brookings, SD

Built 1925 Load: 22.9 t ADT: 1,163

IRR AR SD047

Poor

Over: BR WEST FORK ELM CK

2.4 N JCT SD 34, Hyde, SD

Built 1959 Load: 23.1 t ADT: 444

RANCH RD.

Poor

Over: EAST KILDEER CK.

2S&6.2E UNIONCENTER, Meade, SD

Built 1930 Load: 23.1 t ADT: 15

208TH ST

Poor

Over: CK

0.5S & 0.2E HETLAND, Kingsbury, SD

Built 1932 Load: 23.2 t ADT: 220

262ND, BENSON RD

Poor

Over: WILLOW CK

1.5N & 0.4E ELLIS, Minnehaha, SD

Built 1974 Load: 23.3 t ADT: 102

48140 312TH ST

Poor

Over: CK

10.5S & 2.4E ALCESTER, Union, SD

Built 1940 Load: 23.7 t ADT: 45

161ST STREET

Poor

Over: CREEK

2.2E TURTON, Spink, SD

Built 1930 Load: 23.8 t ADT: 91

IRR BIA RTE 5

Poor

Over: LITTLE WHITE RIVER

17.6 KM NE SPRING CR SCH, Todd, SD

Built 1965 Load: 23.9 t ADT: 1,019

196TH STREET

Poor

Over: CK

16N & 1.1E BROOKINGS, Brookings, SD

Built 1940 Load: 24.0 t ADT: 92

Showing 5,401-5,450 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.