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

IRR US018

Poor

Over: CREEK

DOUGLAS/CHARLES MIX CO LN, Douglas, SD

Built 1961 Load: 25.8 t ADT: 588

WAYNE AVENUE

Poor

Over: TRIB TO SKUNK CK

3.4S & 1.5W ELLIS, Minnehaha, SD

Built 1940 Load: 25.9 t ADT: 56

472ND AVE, HWY 133

Poor

Over: TRIB TO BIG SIOUX RV

2E & 0.4S CROOKS, Minnehaha, SD

Built 1955 Load: 25.9 t ADT: 1,204

45340 272 ST

Poor

Over: CK

3N & 0.3E PARKER, Turner, SD

Built 1939 Load: 26.1 t ADT: 35

45370 277TH ST

Poor

Over: CK

2S & 0.7E PARKER, Turner, SD

Built 1940 Load: 26.1 t ADT: 50

365TH AVE

Poor

Over: CK

1.2N DANFORTH, Hand, SD

Built 1930 Load: 26.2 t ADT: 59

176 STREET

Poor

Over: BIG SIOUX RV

4.0S 2.6E WATERTOWN, Codington, SD

Built 1971 Load: 26.3 t ADT: 468

I-90 SERVICE ROAD

Poor

Over: CROW CK

1.5 E WY STATE LINE, Lawrence, SD

Built 1940 Load: 26.4 t ADT: 1,500

256TH STREET

Poor

Over: WEST PIPESTONE CREEK

4N & 0.4W CORSON, Minnehaha, SD

Built 1940 Load: 26.5 t ADT: 76

48020 309 STR.

Poor

Over: EAST UNION CK

7.5S & 1.2E ALCESTER, Union, SD

Built 1950 Load: 26.8 t ADT: 45

TIDEWATER RD.

Poor

Over: WHITE OWL CK

14.0E & 5.2N UNION CENTER, Meade, SD

Built 1945 Load: 26.9 t ADT: 33

257TH STREET

Poor

Over: WEST PIPESTONE CREEK

3N & 0.2W CORSON, Minnehaha, SD

Built 1940 Load: 27.0 t ADT: 71

US014 EF

Poor

Over: PRAIRIE DOG CK

7.8 S JCT SD 34, Stanley, SD

Built 1920 Load: 27.2 t ADT: 50

US014 EF

Poor

Over: LITTLE PRAIRIE DOG CK

1.9 N HAAKON CO LINE, Stanley, SD

Built 1920 Load: 27.2 t ADT: 50

215 STREET

Poor

Over: WEST FORK ELM CK

1N 1.2W STEPHAN, Hyde, SD

Built 1928 Load: 27.3 t ADT: 65

159TH STREET

Poor

Over: CREEK

9.2W & 2N TURTON, Spink, SD

Built 1950 Load: 27.3 t ADT: 31

SD050

Poor

Over: R&W RR

2.7 N I 90 INTERCH, Brule, SD

Built 1952 Load: 27.4 t ADT: 4,554

407TH AVENUE

Poor

Over: NORTH BR TWELVE MILE CK

2 W & 10.2S MITCHELL, Davison, SD

Built 1930 Load: 27.5 t ADT: 64

River Boulevard

Poor

Over: Big Sioux River

W of Southeastern Avenue, Minnehaha, SD

Built 1975 Load: 27.5 t ADT: 5,300

STAE HIGHWAY 1806

Poor

Over: OAHE DAM SPILLWAY

5 Miles No. of Ft. Pierre, Stanley, SD

Built 1963 Load: 27.5 t ADT: 123

STONEVILLE RD.

Poor

Over: CK

11.8 S US 212, Meade, SD

Built 1970 Load: 27.8 t ADT: 233

343RD AVE

Poor

Over: SOUTH FORK SNAKE CK

9W FAULKTON, Faulk, SD

Built 1930 Load: 27.9 t ADT: 60

US212

Poor

Over: SOUTH FORK SNAKE CK

1 W OF FAULKTON, Faulk, SD

Built 1939 Load: 27.9 t ADT: 763

326 AVENUE

Poor

Over: SOUTH CHAPELLE CK

2W 11.6S HOLABIRD, Hyde, SD

Built 1920 Load: 27.9 t ADT: 65

IRR US012

Poor

Over: HAY CK

1.3 E OF MORRISTOWN, Corson, SD

Built 1949 Load: 28.2 t ADT: 436

372ND AVE

Poor

Over: DOVE CK

2.1N ZELL, Faulk, SD

Built 1980 Load: 28.2 t ADT: 205

471ST STREET

Poor

Over: NORTH DEER CK

10.4N BROOKINGS, Brookings, SD

Built 1925 Load: 28.3 t ADT: 462

US012

Poor

Over: MOCCASIN CK

1.4 E JCT US 281 N, Brown, SD

Built 1954 Load: 28.5 t ADT: 22,327

392 AVENUE

Poor

Over: SAND CK

3.1S & 0.3W ALPENA, Jerauld, SD

Built 2008 Load: 28.5 t ADT: 25

471ST AVENUE

Poor

Over: CK

5.8S BROOKINGS, Brookings, SD

Built 1925 Load: 28.9 t ADT: 1,305

188 STREET

Poor

Over: HIDEWOOD CK

6N & 1.8E ESTELLINE, Deuel, SD

Built 1978 Load: 29.0 t ADT: 90

SLATE PRAIRIE ROAD

Poor

Over: CASTLE CK

0.5E 1.2N DEERFD DAM, Pennington, SD

Built 1950 Load: 29.9 t ADT: 73

214TH STREET

Poor

Over: BIG SIOUX RV

2S & 3.6W BROOKINGS, Brookings, SD

Built 1962 Load: 30.0 t ADT: 64

McCURDY GULCH

Poor

Over: RAPID CREEK

T 1 N R 5 E SEC 2, Pennington, SD

Built 1945 Load: 30.1 t ADT: 10

SD013

Poor

Over: MEDARY CK

0.8 S JCT US 14, Brookings, SD

Built 1938 Load: 30.7 t ADT: 1,149

IRR SD034

Poor

Over: CHEYENNE RV

ZIEBACH CO LINE, Haakon, SD

Built 1962 Load: 30.8 t ADT: 576

I029 S

Poor

Over: BIG SIOUX RV

1 S BROOKINGS CO LINE, Moody, SD

Built 1966 Load: 30.9 t ADT: 7,880

I029 N

Poor

Over: BIG SIOUX RV

1 S BROOKINGS CO LINE, Moody, SD

Built 1966 Load: 30.9 t ADT: 7,880

248TH ST, HWY 110

Poor

Over: SKUNK CK

3.7E COLTON, Minnehaha, SD

Built 1963 Load: 31.5 t ADT: 607

US014

Poor

Over: BELCHER CK

4.3 E OF PHILIP, Haakon, SD

Built 1955 Load: 31.6 t ADT: 725

IRR SD063

Poor

Over: DUPREE CK

1.7 N HAAKON CO LINE, Ziebach, SD

Built 1961 Load: 31.6 t ADT: 656

S. Cliff Avenue

Poor

Over: Big Sioux River

south of I-229, Minnehaha, SD

Built 1986 Load: 31.7 t ADT: 9,363

CAPITOL AVE

Poor

Over: CAPITOL LAKE OUTLET

CAPITOL AVE PIERRE, Hughes, SD

Built 1950 Load: 32.0 t ADT: 7,155

US018

Poor

Over: JAMES RV

0.6 E OF OLIVET, Hutchinson, SD

Built 1956 Load: 32.0 t ADT: 707

487TH AVE, HWY 103

Poor

Over: BEAVER CREEK

NW CORNER VALLEY SPRINGS, Minnehaha, SD

Built 1967 Load: 32.3 t ADT: 1,006

IRR BIA RTE 2

Poor

Over: POTATO CREEK

8.9 KM WEST OF SD HWY 44, Jackson, SD

Built 1942 Load: 32.4 t ADT: 1,314

464th Avenue

Poor

Over: Blind Creek

7W & 1.6N of Beresford, Lincoln, SD

Built 1941 Load: 32.4 t ADT: 80

409TH AVE

Poor

Over: CREEK

3E & 1.6S DOLAND, Spink, SD

Built 1945 Load: 32.4 t ADT: 50

173RD STREET

Poor

Over: CREEK

4.5E & 1S DOLAND, Spink, SD

Built 1935 Load: 32.4 t ADT: 31

SD034

Poor

Over: CHAPELLE CK

22.5 E JCT US 14 & 83, Hughes, SD

Built 1949 Load: 33.3 t ADT: 658

Showing 5,551-5,600 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.