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

SORUM ROAD

Good

Over: GAP CK

4W & 5S PRAIRIE CITY, Perkins, SD

Built 1952 Load: 21.3 t ADT: 85

Spur Avenue

Good

Over: Trib. to Pattee Creek

1.4N of Jct with SD 46, Lincoln, SD

Built 1997 Load: 21.4 t ADT: 654

CROKED CREEK

Good

Over: FALSE BOTTOM CREEK

T 5 N R 2 E SEC 24, Lawrence, SD

Built 2003 Load: 21.7 t ADT: 25

US016A

Good

Over: LAUGHING WATER CK

0.4 E JCT US 16 & 385 N, Custer, SD

Built 1964 Load: 21.8 t ADT: 5,106

151 ST

Good

Over: CK

2.6E & 1.0S TWIN BROOKS, Grant, SD

Built 2003 Load: 21.8 t ADT: 52

205TH ST

Good

Over: CK

7S & 4E ST LAWRENCE, Hand, SD

Built 1930 Load: 21.8 t ADT: 44

403RD AVE.

Good

Over: SAND CK

2.4N & 2W FORESTBURG, Sanborn, SD

Built 2008 Load: 21.8 t ADT: 56

IRR COUNTY ROAD

Good

Over: PHISTER CK

3.9S & 8W PARMELLE, Todd, SD

Built 2003 Load: 21.8 t ADT: 15

288 STREET

Good

Over: PONCA CK

6E 2S COLOME, Tripp, SD

Built 2012 Load: 21.8 t ADT: 150

31450 471 AVE.

Good

Over: CK

16.5S BERESFORD, Union, SD

Built 1955 Load: 21.8 t ADT: 400

31410 474TH AVE

Good

Over: BRULE CK

1.8E & 16.1S BERESFORD, Union, SD

Built 1986 Load: 21.8 t ADT: 40

Old NE Road

Good

Over: Unnamed Creek

2W & 1.7S CACTUS FLAT, Jackson, SD

Built 1935 Load: 22.0 t ADT: 27

SD019

Good

Over: CK

1.6 S LAKE CO LINE, Minnehaha, SD

Built 2014 Load: 22.0 t ADT: 1,586

US212

Good

Over: CHEYENNE CK

0.8 W JCT US 83 S, Potter, SD

Built 1940 Load: 22.0 t ADT: 985

SD020

Good

Over: SOUTH FORK YELLOW BANK R

6.3 S JCT SD 158, Grant, SD

Built 2021 Load: 22.1 t ADT: 1,368

FOREST ROAD

Good

Over: RAPID CK

0.2W & 0.2S JOHNSON SIDNG, Pennington, SD

Built 2001 Load: 22.4 t ADT: 101

SD079

Good

Over: FROG CK

10 NE JCT SD 168, Butte, SD

Built 2021 Load: 22.5 t ADT: 388

469th Avenue

Good

Over: Snake Creek

3E & 5.9S of Lennox, Lincoln, SD

Built 1999 Load: 22.6 t ADT: 145

SD019

Good

Over: BR SKUNK CK

6.5 S LAKE CO LINE, Minnehaha, SD

Built 2014 Load: 22.6 t ADT: 1,626

152 ST

Good

Over: CK

4.8W & 3.0S MILBANK, Grant, SD

Built 2005 Load: 22.7 t ADT: 35

479 AVE

Good

Over: CK

3.0W & 1.8N ALBEE, Grant, SD

Built 2005 Load: 22.7 t ADT: 35

481 AVE

Good

Over: CK

1.0W & 1.8N ALBEE, Grant, SD

Built 2005 Load: 22.7 t ADT: 52

484 AVE

Good

Over: CK

2.0E & 1.9N ALBEE, Grant, SD

Built 2004 Load: 22.7 t ADT: 52

368 AVE

Good

Over: CK

4.8S ROCKHAM, Hand, SD

Built 2023 Load: 22.7 t ADT: 47

BOXELDER FORKS CG

Good

Over: BOXELDER CREEK

T 3 N R 5 E SEC 29, Meade, SD

Built 1972 Load: 22.7 t ADT: 25

BIXBY ROAD

Good

Over: ANTELOPE CK

5.7 W 15.3 S BISON, Perkins, SD

Built 1965 Load: 23.0 t ADT: 155

MELGAARD ROAD

Good

Over: MOCCASIN CK

MELGAARD RD(18TH)ABERDEEN, Brown, SD

Built 1990 Load: 23.2 t ADT: 3,600

SD019

Good

Over: NORTH BUFFALO CK

2.8 N MINNEHAHA CO LINE, Lake, SD

Built 2014 Load: 23.2 t ADT: 1,586

AVANCE RD.

Good

Over: CK

10 W & 11.1 S FAITH, Meade, SD

Built 1960 Load: 23.2 t ADT: 53

NEMO ROAD

Good

Over: BOX ELDER CK

6.1W 2.2N RAPID CITY, Pennington, SD

Built 1972 Load: 23.2 t ADT: 2,013

HWY 1416

Good

Over: Trib. to Box Elder Creek

5.6 E NEW UNDERWOOD, Pennington, SD

Built 2013 Load: 23.2 t ADT: 156

SD019

Good

Over: TRIB TO BUFFALO LAKE

0.1 N MINNEHAHA CO LINE, Lake, SD

Built 2014 Load: 23.3 t ADT: 1,586

US014

Good

Over: CK

9.1 E HYDE CO LINE, Hand, SD

Built 1935 Load: 23.5 t ADT: 1,935

SD079

Good

Over: MEADE ST. DRAINAGE

0.2SE ST JOE & ST PAT -RC, Pennington, SD

Built 1964 Load: 23.5 t ADT: 15,500

296 AVENUE

Good

Over: OKOBOJO CK

15.5W & 4.5S ONIDA, Sully, SD

Built 2010 Load: 23.6 t ADT: 48

265 ST

Good

Over: South Fork Platte Creek

13S 3.5E WHITE LAKE, Aurora, SD

Built 1941 Load: 23.9 t ADT: 40

468th Avenue

Good

Over: Tributary to Blind Creek

3W & 2.8N of Beresford, Lincoln, SD

Built 2016 Load: 23.9 t ADT: 48

SD079

Good

Over: COTTONWOOD CK

4.2 S BUTTE CO LINE, Meade, SD

Built 2021 Load: 23.9 t ADT: 2,199

46610 304 ST.

Good

Over: BAPTIST CK

7S & 14.1E IRENE, Clay, SD

Built 2012 Load: 24.0 t ADT: 11

SD028

Good

Over: CK

1.9 W JCT SD 21 N, Hamlin, SD

Built 2011 Load: 24.0 t ADT: 1,364

46030 272 ST

Good

Over: LONG CK

5N & 0.7W CHANCELLOR, Turner, SD

Built 2018 Load: 24.0 t ADT: 97

Spring Valley Road

Good

Over: TRIB PRIEST CANYON CK

0.7 E & 0.6 S I90 Exit 44, Meade, SD

Built 2015 Load: 24.1 t ADT: 175

378TH AVE

Good

Over: SNAKE CREEK

3 W 0.3 N NORTHVILLE, Spink, SD

Built 1967 Load: 24.1 t ADT: 39

SUNNY BROOK ROAD

Good

Over: HORSEHEAD CK

4.5W & 5.5N OELRICHS, Fall River, SD

Built 1979 Load: 24.2 t ADT: 20

288th Street

Good

Over: Saddle Creek

9S & 2.1E of Lennox, Lincoln, SD

Built 1964 Load: 24.2 t ADT: 80

CROOK CITY ROAD

Good

Over: WHITEWOOD CREEK

T 6 N R 4 E SEC 33, Meade, SD

Built 1983 Load: 24.3 t ADT: 50

GRIZZLY PG

Good

Over: GRIZZLY BEAR CREEK

T2S R6E SECTION 17, Pennington, SD

Built 1973 Load: 24.3 t ADT: 25

456TH AVENUE

Good

Over: LONG HOLLOW CK

2.0W & 2.0N SISSETON, Roberts, SD

Built 2006 Load: 24.4 t ADT: 33

392 AVE

Good

Over: CK

1.4S 1W STORLA, Aurora, SD

Built 1935 Load: 24.5 t ADT: 65

193rd Street

Good

Over: Turtle Creek

9.0N & 0.2E of Wessington, Beadle, SD

Built 2006 Load: 24.5 t ADT: 2

Showing 3,201-3,250 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.