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

40430 306th Street

Good

Over: Choteau Creek

2.7W & 3S of Avon, Charles Mix, SD

Built 2016 Load: 24.5 t ADT: 60

414th Avenue

Good

Over: Creek

11.5 N Raymond, Clark, SD

Built 1956 Load: 24.5 t ADT: 158

414th Avenue

Good

Over: Creek

4.1 N Raymond, Clark, SD

Built 1956 Load: 24.5 t ADT: 245

414th Avenue

Good

Over: Creek

0.9 N Raymond, Clark, SD

Built 1956 Load: 24.5 t ADT: 450

414th Avenue

Good

Over: Creek

0.5 S Raymond, Clark, SD

Built 1956 Load: 24.5 t ADT: 389

45410 307 ST

Good

Over: CLAY CK

10.0S & 2.1E IRENE, Clay, SD

Built 2005 Load: 24.5 t ADT: 10

30880 BLUFF ROAD

Good

Over: CK

6S & 0.1W WAKONDA, Clay, SD

Built 1975 Load: 24.5 t ADT: 111

45750 300 ST.

Good

Over: SPRING CK

3S & 5.5E IRENE, Clay, SD

Built 1999 Load: 24.5 t ADT: 25

30370 458 AVE

Good

Over: CK

6.7S & 6E IRENE, Clay, SD

Built 2002 Load: 24.5 t ADT: 20

30920 458 AVE

Good

Over: CK

12.2S & 6E IRENE, Clay, SD

Built 1993 Load: 24.5 t ADT: 25

45910 300 ST.

Good

Over: FROG CK

3S & 7.2E IRENE, Clay, SD

Built 1993 Load: 24.5 t ADT: 30

30350 461 STREET

Good

Over: VERMILLION RV OVERFLOW

6.5S & 9E IRENE SD, Clay, SD

Built 2002 Load: 24.5 t ADT: 97

46150 310 ST.

Good

Over: CK

8N & 2W VERMILLION, Clay, SD

Built 1978 Load: 24.5 t ADT: 25

31160 462 AVE.

Good

Over: CK

14.6S & 10E IRENE, Clay, SD

Built 1999 Load: 24.5 t ADT: 77

46290 300 ST.

Good

Over: VERMILLION RV

7.9E & 2N WAKONDA, Clay, SD

Built 1982 Load: 24.5 t ADT: 102

46310 313 ST

Good

Over: CK

0.6 E JCT SD 19, Clay, SD

Built 1998 Load: 24.5 t ADT: 150

29920 464 AVE.

Good

Over: ASH CK

2 E & 4 S Centerville, Clay, SD

Built 2001 Load: 24.5 t ADT: 97

30250 464 AVE

Good

Over: CK

5.5S & 12.0E IRENE, Clay, SD

Built 2005 Load: 24.5 t ADT: 97

46620 298 ST.

Good

Over: ASH CK

1S & 14.2E IRENE, Clay, SD

Built 2002 Load: 24.5 t ADT: 25

211th Avenue

Good

Over: BLACK HORSE BUTTE CK

4E & 27S THUNDER HAWK, Corson, SD

Built 1999 Load: 24.5 t ADT: 30

OLD SAWMILL ROAD

Good

Over: MICKELSON TRAIL

1.0 SOUTH OF CUSTER, Custer, SD

Built 2009 Load: 24.5 t ADT: 50

398TH AVENUE

Good

Over: NORTH BR TWELVE MILE CK

11.3 S & 1E MT VERNO, Davison, SD

Built 2002 Load: 24.5 t ADT: 64

406TH AVENUE

Good

Over: CK

2 W 1.4 S MITCHELL, Davison, SD

Built 2000 Load: 24.5 t ADT: 187

267TH STREET

Good

Over: SOUTH FORK TWELVE MILE C

13S & 2.8 W MITCHELL, Davison, SD

Built 2003 Load: 24.5 t ADT: 24

130TH Street

Good

Over: Creek

0.5 N & 5.1 W of Pierpont, Day, SD

Built 1930 Load: 24.5 t ADT: 376

448th Avenue

Good

Over: Creek

2.5E & 0.3N of Waubay, Day, SD

Built 1993 Load: 24.5 t ADT: 69

486 AVENUE

Good

Over: CK

6.7S 4.5E REVILLO, Deuel, SD

Built 1953 Load: 24.5 t ADT: 410

BIA Highway 4

Good

Over: Creek

2N PROMISE, Dewey, SD

Built 2008 Load: 24.5 t ADT: 90

38830 281 ST

Good

Over: ANDES CK

3.7W .5S ARMOUR, Douglas, SD

Built 1962 Load: 24.5 t ADT: 206

31940 269 ST

Good

Over: CK

4.0N,2.4E OF CORSICA, Douglas, SD

Built 1941 Load: 24.5 t ADT: 77

27520 397 AVE

Good

Over: CK

4.8N,5.0E OF ARMOUR, Douglas, SD

Built 1969 Load: 24.5 t ADT: 35

28470 401 AVE

Good

Over: CK

0.5W 0.7S DELMONT, Douglas, SD

Built 1940 Load: 24.5 t ADT: 424

Nesbitt Drive

Good

Over: Mina Lake Spillway

1.7E & 0.5N of Mina, Edmunds, SD

Built 2004 Load: 24.5 t ADT: 200

DEWEY RD

Good

Over: CK

0.2W & 0.3N BURDOCK, Fall River, SD

Built 1991 Load: 24.5 t ADT: 50

E. ARDMORE RD

Good

Over: HORSEHEAD CK

8.3S & 2.7W OELRICHS, Fall River, SD

Built 1988 Load: 24.5 t ADT: 41

LENNON SCHOOL ROAD

Good

Over: HORSEHEAD CK

1.7W & 2.8N OELRICHS, Fall River, SD

Built 1995 Load: 24.5 t ADT: 15

ASH ROAD

Good

Over: IRRIGATION DITCH

1.3E & 1.3S OF ORAL, Fall River, SD

Built 1979 Load: 24.5 t ADT: 15

SAND CREEK ROAD

Good

Over: IRRIGATION DITCH

2.3E & 0.4S ORAL, Fall River, SD

Built 1993 Load: 24.5 t ADT: 65

SMITHWICK ROAD

Good

Over: SAND CK

E. CITY LIMIT SMITHWICK, Fall River, SD

Built 1979 Load: 24.5 t ADT: 41

GRAVEL ROAD

Good

Over: IRRIGATION DITCH

2.8E ORAL, Fall River, SD

Built 1936 Load: 24.5 t ADT: 15

HIGHLINE ROAD

Good

Over: IRRIGATION DITCH

4.3E & 0.4N OF ORAL, Fall River, SD

Built 1950 Load: 24.5 t ADT: 15

E. ORAL RD.

Good

Over: IRRIGATION DITCH

5.2N & 1N ORAL, Fall River, SD

Built 1950 Load: 24.5 t ADT: 15

ORAL ROAD

Good

Over: IRRIGATION DITCH

5.3E & 1.2N ORAL, Fall River, SD

Built 1987 Load: 24.5 t ADT: 41

476A AVE CENTER RD

Good

Over: NORTH FORK YELLOW BANK R

1.5W & 3.5S MILBANK, Grant, SD

Built 2004 Load: 24.5 t ADT: 20

483 AVE

Good

Over: CK

1.0E & 1.3N ALBEE, Grant, SD

Built 2003 Load: 24.5 t ADT: 35

281 STREET

Good

Over: Bull Creek

6N & 0.7E DALLAS, Gregory, SD

Built 2001 Load: 24.5 t ADT: 36

342 AVENUE

Good

Over: PONCA CK

4.3S & 2W BURKE, Gregory, SD

Built 2007 Load: 24.5 t ADT: 36

358 AVENUE

Good

Over: NORTH FORK WHETSTONE CK

10.3N & 3.9 W BONESTEEL, Gregory, SD

Built 2001 Load: 24.5 t ADT: 20

366 AVENUE

Good

Over: NORTH SCALP CK

4.2E & 2.8N BONESTEEL, Gregory, SD

Built 2015 Load: 24.5 t ADT: 36

LODGE ROAD

Good

Over: RANDALL CK

13.1E & 0.1S FAIRFAX, Gregory, SD

Built 1984 Load: 24.5 t ADT: 36

Showing 3,301-3,350 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.