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

252ND STREET

Good

Over: WEST BR SKUNK CK

4S&1.3E BUFFALO TRADING, Minnehaha, SD

Built 1992 Load: 19.6 t ADT: 35

460TH AVENUE

Good

Over: WEST BR SKUNK CK

3E & 5.1N HUMBOLDT, Minnehaha, SD

Built 2014 Load: 19.6 t ADT: 39

253RD ST

Good

Over: WEST BR SKUNK CK

3.8W & 4.5S COLTON, Minnehaha, SD

Built 2014 Load: 19.6 t ADT: 46

248TH ST, HWY 110

Good

Over: COLTON CK

0.4W COLTON, Minnehaha, SD

Built 2004 Load: 19.6 t ADT: 754

250TH ST, HWY 114

Good

Over: COLTON CK

2S & 0.3E COLTON, Minnehaha, SD

Built 2008 Load: 19.6 t ADT: 1,169

466TH AVENUE

Good

Over: TRIB TO SKUNK CK

3E & 0.7S HARTFORD, Minnehaha, SD

Built 2009 Load: 19.6 t ADT: 161

GRAND VIEW MEADOW

Good

Over: SKUNK CK

1.9S & 0.9W LYONS, Minnehaha, SD

Built 1989 Load: 19.6 t ADT: 52

267TH ST, HWY 148

Good

Over: TRIB TO SKUNK CK

3.5S & 1.9W ELLIS, Minnehaha, SD

Built 2007 Load: 19.6 t ADT: 3,487

249TH STREET

Good

Over: SKUNK CK

1S & 3.3E COLTON, Minnehaha, SD

Built 1990 Load: 19.6 t ADT: 39

255TH STREET

Good

Over: WILLOW CK

7S & 4.1E COLTON, Minnehaha, SD

Built 1989 Load: 19.6 t ADT: 32

245TH STREET

Good

Over: SKUNK CK

3N & 4.7E COLTON, Minnehaha, SD

Built 1989 Load: 19.6 t ADT: 56

ELLIS RD, HWY 139

Good

Over: SKUNK CK

0.7S ELLIS, Minnehaha, SD

Built 2013 Load: 19.6 t ADT: 5,934

259TH STREET

Good

Over: WILLOW CK

2S & 0.9W CROOKS, Minnehaha, SD

Built 1987 Load: 19.6 t ADT: 30

260TH STREET

Good

Over: WILLOW CK

3S & 0.8W CROOKS, Minnehaha, SD

Built 2001 Load: 19.6 t ADT: 52

470TH, LAMESA DR

Good

Over: TRIB TO WILLOW CK

2.4N & 1E ELLIS, Minnehaha, SD

Built 2010 Load: 19.6 t ADT: 128

260TH STREET

Good

Over: TRIB TO WILLOW CK

3.5N & 1.4E ELLIS, Minnehaha, SD

Built 1987 Load: 19.6 t ADT: 44

258TH ST, HWY 130

Good

Over: TRIB TO BIG SIOUX RV

2.1W RENNER, Minnehaha, SD

Built 2008 Load: 19.6 t ADT: 2,810

252ND STREET

Good

Over: DIVERSION DITCH

2S & 1.5W OF BALTIC, Minnehaha, SD

Built 2010 Load: 19.6 t ADT: 16

473RD AVENUE

Good

Over: TRIB TO BIG SIOUX RV

1.4W & 0.5N DELL RAPIDS, Minnehaha, SD

Built 1990 Load: 19.6 t ADT: 39

DITCH RD

Good

Over: DIVERSION DITCH

3.8S & 0.3W BALTIC, Minnehaha, SD

Built 1998 Load: 19.6 t ADT: 39

256TH STREET

Good

Over: TRIB TO W PIPESTONE CK

4N & 1.4W CORSON, Minnehaha, SD

Built 1999 Load: 19.6 t ADT: 32

247TH STREET

Good

Over: WEST PIPESTONE CREEK

7.0E & 1.3S DELL RAPIDS, Minnehaha, SD

Built 2001 Load: 19.6 t ADT: 11

257TH STREET

Good

Over: SPLIT ROCK CREEK

4.6N & 1E BRANDON, Minnehaha, SD

Built 1994 Load: 19.6 t ADT: 52

250TH ST, HWY 114

Good

Over: TRIB TO SPLIT ROCK CK

1.1W SHERMAN, Minnehaha, SD

Built 2008 Load: 19.6 t ADT: 486

487TH AVE, HWY 103

Good

Over: TRIB TO BEAVER CK

1.2S OF VALLEY SPRINGS, Minnehaha, SD

Built 2004 Load: 19.6 t ADT: 600

487TH AVE, HWY 103

Good

Over: FOUR MILE CREEK

2.5S VALLEY SPRINGS, Minnehaha, SD

Built 1995 Load: 19.6 t ADT: 537

262ND ST, HWY 138

Good

Over: TRIB TO BEAVER CK

0.1E VALLEY SPRINGS, Minnehaha, SD

Built 2000 Load: 19.6 t ADT: 1,006

253RD ST, HWY 120

Good

Over: TRIB TO SPLIT ROCK CK

2.4E GARRETSON, Minnehaha, SD

Built 2010 Load: 19.6 t ADT: 412

258TH ST, HWY 130

Good

Over: TRIB TO BEAVER CK

2N & 5.8E CORSON, Minnehaha, SD

Built 2009 Load: 19.6 t ADT: 342

GREEN STREET

Good

Over: MARNE CREEK

GREEN STREET - YANKTON, Yankton, SD

Built 2008 Load: 19.6 t ADT: 500

299th Avenue

Good

Over: Unnamed Creek

6W & 7.8N of Presho, Lyman, SD

Built 1968 Load: 19.7 t ADT: 25

SD045

Good

Over: CK

1.7 S BRULE CO LINE, Charles Mix, SD

Built 1948 Load: 19.9 t ADT: 1,047

483 AVENUE

Good

Over: COBB CK

12N ASTORIA, Deuel, SD

Built 1956 Load: 20.0 t ADT: 280

150 ST

Good

Over: CK

2.5W & 1.0S MILBANK, Grant, SD

Built 2006 Load: 20.0 t ADT: 52

SD028

Good

Over: TRIB DOLPH CK

5.8 W JCT SD 21 N, Hamlin, SD

Built 2021 Load: 20.0 t ADT: 1,240

SD020

Good

Over: SIOUX CK

14.8 E JCT US 85, Harding, SD

Built 2021 Load: 20.1 t ADT: 158

BASELINE ROAD

Good

Over: Tributary to Rapid Creek

7S 5.2E NEW UNDERWOO, Pennington, SD

Built 2016 Load: 20.2 t ADT: 24

8TH AVENUE

Good

Over: BELLE FOURCHE RV

8TH AVE. BELLE FOURCHE, Butte, SD

Built 1994 Load: 20.4 t ADT: 1,637

164TH ST

Good

Over: SOUTH FORK SNAKE CK

2.2 W ATHOL, Spink, SD

Built 1978 Load: 20.4 t ADT: 135

27550 456 AVE

Good

Over: WEST FORK VERMILLION RV

0.5S & 3E PARKER, Turner, SD

Built 2013 Load: 20.4 t ADT: 45

CO RD 988 - 112 ST

Good

Over: LITTLE MISSOURI RV

3.7S 7.8W LADNER, Harding, SD

Built 2006 Load: 20.5 t ADT: 45

AVALANCH RD.

Good

Over: CK

0.5 W STURGIS, Meade, SD

Built 1963 Load: 20.6 t ADT: 33

479 AVE

Good

Over: CK

3.0W & 5.2N ALBEE, Grant, SD

Built 2005 Load: 20.9 t ADT: 35

479 AVE

Good

Over: CK

3.0W & 4.1N ALBEE, Grant, SD

Built 2005 Load: 20.9 t ADT: 35

481 AVE

Good

Over: SOUTH FORK YELLOW BANK R

1.0W & 0.9S ALBEE, Grant, SD

Built 2003 Load: 20.9 t ADT: 40

IRR BIA RTE 33

Good

Over: WOUNDED KNEE CREEK

2.6KM N OF MANDERSON, Oglala Lakota, SD

Built 2007 Load: 20.9 t ADT: 600

WHITE HILL ROAD

Good

Over: SOUTH FORK GRAND RV

4W 8.5N PRAIRIE CITY, Perkins, SD

Built 1997 Load: 20.9 t ADT: 30

183RD ST

Good

Over: TURTLE CREEK

4.1 W TULARE, Spink, SD

Built 1970 Load: 20.9 t ADT: 239

Valley Road

Good

Over: Trib. to E Fork Verm Rv

0.2W & 5.3N of Montrose, McCook, SD

Built 1957 Load: 21.0 t ADT: 215

109th Street

Good

Over: Spring Creek

1.5 S & 5.1 W of Herreid, Campbell, SD

Built 1954 Load: 21.2 t ADT: 121

Showing 3,151-3,200 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.