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

376th Avenue

Good

Over: Turtle Creek

10.5N & 2E of Wessington, Beadle, SD

Built 2004 Load: 24.5 t ADT: 4

202nd Street

Good

Over: James River

1.5N & 6.4W of Yale, Beadle, SD

Built 1969 Load: 24.5 t ADT: 104

406TH AVE

Good

Over: BYRON LK

4.5 S BLOOMFIELD, Beadle, SD

Built 1939 Load: 24.5 t ADT: 50

406th Avenue

Good

Over: Shue Creek

6E & 5.1N of Huron, Beadle, SD

Built 1986 Load: 24.5 t ADT: 37

407th Avenue

Good

Over: Shue Creek

2W & 5.1N Cavour, Beadle, SD

Built 1983 Load: 24.5 t ADT: 37

408 Ave

Good

Over: Pearl Creek

7.1 S & 1.0 W Cavour, Beadle, SD

Built 2004 Load: 24.5 t ADT: 16

215 ST

Good

Over: Pearl Creek

7.0 S & 0.7 W Cavour, Beadle, SD

Built 2004 Load: 24.5 t ADT: 16

201st Street

Good

Over: Shue Creek

7N & 0.7E of Cavour, Beadle, SD

Built 1932 Load: 24.5 t ADT: 56

290 STREET

Good

Over: CK

3 N 0.5 W TUTHILL, Bennett, SD

Built 1954 Load: 24.5 t ADT: 123

Stone House Road

Good

Over: Dry Choteau Creek

1.7W & 1.5S of Avon, Bon Homme, SD

Built 2001 Load: 24.5 t ADT: 60

31060 416th Avenue

Good

Over: Creek

1.4N & 1E of Springfield, Bon Homme, SD

Built 1935 Load: 24.5 t ADT: 132

478TH AVENUE

Good

Over: CK

5.8N BUSHNELL, Brookings, SD

Built 2016 Load: 24.5 t ADT: 712

135th Street

Good

Over: Snake Creek

9.1W & 2.0S of Aberdeen, Brown, SD

Built 2006 Load: 24.5 t ADT: 50

148th Street

Good

Over: Mansfield Slough

0.4 East of Mansfield, Brown, SD

Built 2006 Load: 24.5 t ADT: 455

384th Avenue

Good

Over: Foot Creek

3.5N & 3.2W of Aberdeen, Brown, SD

Built 1995 Load: 24.5 t ADT: 98

131st Street

Good

Over: Foot Creek

2N & 2.5W of Aberdeen, Brown, SD

Built 2004 Load: 24.5 t ADT: 98

387th Avenue

Good

Over: Foot Creek

2.4S of Aberdeen, Brown, SD

Built 2009 Load: 24.5 t ADT: 775

387th Avenue

Good

Over: Moccasin Creek

1.8S of Warner, Brown, SD

Built 2010 Load: 24.5 t ADT: 98

104th Street

Good

Over: Maple River

3.3N & 1.8E of Frederick, Brown, SD

Built 2013 Load: 24.5 t ADT: 150

393rd Avenue

Good

Over: Moccasin Creek

6S & 2.5W of Bath, Brown, SD

Built 2021 Load: 24.5 t ADT: 98

122nd Street

Good

Over: Crow Creek Ditch

5.5E & 0.5N of Columbia, Brown, SD

Built 2012 Load: 24.5 t ADT: 98

100th Street

Good

Over: James River

4N & 1.4W of Hecla, Brown, SD

Built 1971 Load: 24.5 t ADT: 100

Crow Creek Ditch

Good

Over: CROW CREEK DITCH

7.6N & 1W CLAREMONT, Brown, SD

Built 2016 Load: 24.5 t ADT: 98

130th Street

Good

Over: Creek

3N & 3.8E of Groton, Brown, SD

Built 2009 Load: 24.5 t ADT: 399

140th Street

Good

Over: Mud Creek

2N & 4.7E of Ferney, Brown, SD

Built 2021 Load: 24.5 t ADT: 98

233rd Street

Good

Over: Crow Creek

2S & 1.9E of Gann Valley, Buffalo, SD

Built 1999 Load: 24.5 t ADT: 41

OWL BASIN RD

Good

Over: CK

12.8N Belle Fourche, Butte, SD

Built 1962 Load: 24.5 t ADT: 10

REID RD

Good

Over: NORTH CANAL

5.5W 5N NISLAND, Butte, SD

Built 1997 Load: 24.5 t ADT: 21

OLD HWY 85

Good

Over: N. BRANCH SPUR CK

6 N 16.6 W HOOVER, Butte, SD

Built 1932 Load: 24.5 t ADT: 21

TAYLOR ROAD

Good

Over: NORTH CANAL

3 W 8 N NISLAND, Butte, SD

Built 1998 Load: 24.5 t ADT: 31

BEET ROAD

Good

Over: INDIAN CK LATERAL

3W 5N NISLAND, Butte, SD

Built 1962 Load: 24.5 t ADT: 75

BEET RD

Good

Over: SOUTH CANAL

2W & 2.5N Nisland, Butte, SD

Built 1997 Load: 24.5 t ADT: 75

OLD HWY 85

Good

Over: CK

6 N 16.4 W HOOVER, Butte, SD

Built 1932 Load: 24.5 t ADT: 21

MAIL RD

Good

Over: NORTH CANAL

2W 8N NISLAND, Butte, SD

Built 1998 Load: 24.5 t ADT: 31

MAIL RD

Good

Over: CK

2W 7N NISLAND, Butte, SD

Built 1998 Load: 24.5 t ADT: 53

MAIL RD

Good

Over: INDIAN CK LATERAL

2 W 5 N NISLAND, Butte, SD

Built 1997 Load: 24.5 t ADT: 22

VALLERY RD

Good

Over: SOUTH CANAL

1.0S 1.3W NISLAND, Butte, SD

Built 1998 Load: 24.5 t ADT: 47

RILEY RD

Good

Over: NORTH CANAL

6.0 W 3.1 N NEWELL, Butte, SD

Built 1997 Load: 24.5 t ADT: 47

WINKLER RD

Good

Over: NORTH CANAL

5 W 4.5 N NEWELL, Butte, SD

Built 1997 Load: 24.5 t ADT: 47

STONE LAKE RD

Good

Over: NORTH CANAL

4.0 W 2.6 N NEWELL, Butte, SD

Built 1996 Load: 24.5 t ADT: 47

SNOMA RD

Good

Over: SOUTH CANAL

5 SO. 3.6W OF NEWELL, Butte, SD

Built 1996 Load: 24.5 t ADT: 59

VALE CUTOFF RD

Good

Over: SOUTH CANAL

5.9 S 3 W NEWELL, Butte, SD

Built 1995 Load: 24.5 t ADT: 66

YPARILLA ROAD

Good

Over: NORTH CANAL

3N 1.5E Newell, Butte, SD

Built 1997 Load: 24.5 t ADT: 47

OLD HWY 212

Good

Over: WILLOW CK

5.5E .2S NEWELL, Butte, SD

Built 2009 Load: 24.5 t ADT: 102

DOUBLE R RD

Good

Over: NORTH FORK SULPHUR CK

11.8 E 13.3 N NEWELL, Butte, SD

Built 1962 Load: 24.5 t ADT: 28

TWILIGHT RD

Good

Over: NORTH FORK SULPHUR CK

13 E 15.3 N NEWELL, Butte, SD

Built 1962 Load: 24.5 t ADT: 25

OLD HWY 212

Good

Over: MUD ELM CK

13.5 E 0.8 N NEWELL, Butte, SD

Built 2023 Load: 24.5 t ADT: 48

FAIRPOINT RD

Good

Over: CK

22.8E 2N OF NEWELL, Butte, SD

Built 2017 Load: 24.5 t ADT: 30

36460 275th Street

Good

Over: Platte Creek

2.4W & 1N of Platte, Charles Mix, SD

Built 2015 Load: 24.5 t ADT: 48

28490 376th Avenue

Good

Over: Pease Creek

2.0E & 0.6N of Geddes, Charles Mix, SD

Built 2017 Load: 24.5 t ADT: 48

Showing 3,251-3,300 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.