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

SD248

Fair

Over: TIN PAN CK

4.6 W JCT US 183, Lyman, SD

Built 1953 Load: 23.1 t ADT: 219

KENTUCKY PL.

Fair

Over: SULFUR CK

9.8S & 2.1E MUD BUTTE, Meade, SD

Built 1925 Load: 23.2 t ADT: 30

48250 VIRGINIA RD

Fair

Over: CK

3.5E & 0.5N ALCESTER, Union, SD

Built 1991 Load: 23.2 t ADT: 55

SD073

Fair

Over: LITTLE WHITE RV

3 S OF MARTIN, Bennett, SD

Built 1964 Load: 23.3 t ADT: 523

I029 S

Fair

Over: CK, BURLINGTON NOR RR

4.8 S SD 20 INTERCH, Codington, SD

Built 1974 Load: 23.3 t ADT: 4,175

US014

Fair

Over: CK

2.5 NE JACKSON CO LINE, Haakon, SD

Built 1955 Load: 23.3 t ADT: 1,015

41440 257 STREET

Fair

Over: JAMES RV

6.6 W ALEXANDRIA, Hanson, SD

Built 1975 Load: 23.3 t ADT: 195

SD248

Fair

Over: BRAVE BULL CK

0.4 E OF BELVIDERE, Jackson, SD

Built 1942 Load: 23.3 t ADT: 84

SD248

Fair

Over: MEDICINE CK

4.9 W LYMAN CO LINE, Jones, SD

Built 1942 Load: 23.3 t ADT: 220

COUNTY HIGHWAY #23

Fair

Over: OAK CK

3S MOSHER, Mellette, SD

Built 1957 Load: 23.3 t ADT: 63

SD046

Fair

Over: EAST BRULE CK

7.9 E OF BERESFORD, Union, SD

Built 1954 Load: 23.3 t ADT: 1,852

SD044

Fair

Over: JAMES RV

15 E JCT SD 37, Hutchinson, SD

Built 1962 Load: 23.4 t ADT: 1,592

237 ST

Fair

Over: EAST FORK VERMILLION RV

4.7S & 3.6E WINFRED, Lake, SD

Built 1940 Load: 23.4 t ADT: 91

MYSTIC ROAD

Fair

Over: CASTLE CK

0.3W 0.6S MYSTIC, Pennington, SD

Built 1940 Load: 23.4 t ADT: 128

294 STREET

Fair

Over: PONCA CK

3.1W & 3S BURKE, Gregory, SD

Built 1950 Load: 23.5 t ADT: 140

10 Mile Road

Fair

Over: GRINDSTONE CK

3.3 W & 10 N PHILIP, Haakon, SD

Built 1965 Load: 23.5 t ADT: 80

300 AVENUE

Fair

Over: KEYA PAHA RV

7W & 2.4S CLEARFIELD, Tripp, SD

Built 1982 Load: 23.6 t ADT: 31

SD050

Fair

Over: SNATCH CK

3.3 NW JCT SD 25, Bon Homme, SD

Built 1956 Load: 23.7 t ADT: 2,322

SD034

Fair

Over: DRAINAGE DITCH

0.6 E I 90 INTERCH, Meade, SD

Built 1964 Load: 23.7 t ADT: 8,970

224 ST

Fair

Over: REDSTONE CK

2S & 2.8W CARTHAGE, Miner, SD

Built 1930 Load: 23.7 t ADT: 52

CONATA BASIN RD

Fair

Over: Trib to White River

1.7E &12.3S WALL, Pennington, SD

Built 1982 Load: 23.7 t ADT: 66

172ND ST

Fair

Over: OKOBOJO CK

4N & 2.9W AGAR, Sully, SD

Built 1912 Load: 23.7 t ADT: 25

US014

Fair

Over: WITCHER HOLES CK

10.9 W OF MIDLAND, Haakon, SD

Built 1994 Load: 23.8 t ADT: 725

I090 W

Fair

Over: CK

2.6 E SD 38 INTERCH, Minnehaha, SD

Built 1961 Load: 23.8 t ADT: 8,550

HWY 1416

Fair

Over: Trib. to Box Elder Creek

10.2 E NEW UNDERWOOD, Pennington, SD

Built 1936 Load: 23.8 t ADT: 90

377TH ST

Fair

Over: SNAKE CREEK

4 W 3.9 N NORTHVILLE, Spink, SD

Built 1966 Load: 23.8 t ADT: 51

The Bottom Road

Fair

Over: Emanuel Creek

1W & 0.9S of Springfield, Bon Homme, SD

Built 1994 Load: 23.9 t ADT: 60

29420 420th Avenue

Fair

Over: Creek

3W & 1.2S of Scotland, Bon Homme, SD

Built 1915 Load: 23.9 t ADT: 60

142nd Street

Fair

Over: James River

1N & 1.6W of Stratford, Brown, SD

Built 2009 Load: 23.9 t ADT: 303

SD037 S

Fair

Over: LAKE MITCHELL SPILLWAY

2.7 N JCT I 90 LOOP, Davison, SD

Built 1943 Load: 23.9 t ADT: 2,460

SD044

Fair

Over: JOHNSON CK

1 E OF INTERIOR, Jackson, SD

Built 1956 Load: 23.9 t ADT: 571

288th Street

Fair

Over: Long Creek

9S & 0.7W of Lennox, Lincoln, SD

Built 1964 Load: 23.9 t ADT: 81

DEER VIEW ROAD

Fair

Over: ELK CK

8.4E&12.3S STURGIS, Meade, SD

Built 1965 Load: 23.9 t ADT: 10

246TH STREET

Fair

Over: TRIB TO BIG SIOUX RV

2.2E & 0.3S DELL RAPIDS, Minnehaha, SD

Built 1940 Load: 23.9 t ADT: 16

401ST AVE

Fair

Over: CREEK

5W & 5.7S DOLAND, Spink, SD

Built 1920 Load: 23.9 t ADT: 31

OLD HWY 85

Fair

Over: SOUTH FORK MOREAU RV

4.6 N 18.7 W HOOVER, Butte, SD

Built 1955 Load: 24.0 t ADT: 21

TWNSHP RD 170TH ST

Fair

Over: CROW TIMBER CK

7.6E & 2N TUNERVILLE, Deuel, SD

Built 1940 Load: 24.0 t ADT: 30

43350 283 ST.

Fair

Over: CK

3.0N,2.5E OF MENNO, Hutchinson, SD

Built 1982 Load: 24.0 t ADT: 15

OPAL RD.

Fair

Over: BEAVER DAM CK

9 S 8.5 E MAURINE, Meade, SD

Built 1966 Load: 24.0 t ADT: 23

MAIN STREET

Fair

Over: ANTELOPE CK

0.1S MISSION, Todd, SD

Built 1978 Load: 24.0 t ADT: 1,400

48040 312TH ST

Fair

Over: EAST UNION CK

10.5S & 1.4E ALCESTER, Union, SD

Built 1950 Load: 24.0 t ADT: 25

243 ST

Fair

Over: CK

4.5 W STORLA, Aurora, SD

Built 1924 Load: 24.1 t ADT: 101

367TH AVE

Fair

Over: SOUTH FORK SNAKE CK

6E & 6.6N MIRANDA, Faulk, SD

Built 1930 Load: 24.1 t ADT: 38

S. Cliff Avenue

Fair

Over: Big Sioux River

south of E. 10th Street, Minnehaha, SD

Built 1973 Load: 24.1 t ADT: 14,800

SD044

Fair

Over: RAPID CK

5.1 SE JCT US 385, Pennington, SD

Built 1958 Load: 24.1 t ADT: 3,104

197TH AVE

Fair

Over: Trib to Cottonwood Creek

0.2E & 0.7S OF QUINN, Pennington, SD

Built 1935 Load: 24.1 t ADT: 19

223RD STREET

Fair

Over: SAND CK

2.1E & 7N WOONSOCKET, Sanborn, SD

Built 2010 Load: 24.1 t ADT: 56

151ST ST

Fair

Over: SNAKE CREEK

3.6 W 3 N NORTHVILLE, Spink, SD

Built 1966 Load: 24.1 t ADT: 51

485TH AVENUE

Fair

Over: CK

6.9N & 1W ELKTON, Brookings, SD

Built 1930 Load: 24.2 t ADT: 92

350 AVE FAS 6471

Fair

Over: AMERICAN CK

0.2N PUKWANA, Brule, SD

Built 1962 Load: 24.2 t ADT: 308

Showing 1,101-1,150 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.