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

127th Street

Poor

Over: Creek

3N & 4.9W Pierpont, Day, SD

Built 1930 Load: 9.3 t ADT: 15

361ST AVE

Poor

Over: REE CK

2.4N & 1E MILLER, Hand, SD

Built 1910 Load: 9.3 t ADT: 43

130TH AVE.

Poor

Over: CK

3 E & 12.5 N STURGIS, Meade, SD

Built 1968 Load: 9.3 t ADT: 33

409th Avenue

Poor

Over: Pearl Creak

4.8S of Cavour, Beadle, SD

Built 1930 Load: 9.4 t ADT: 178

480th Avenue

Poor

Over: East Brule Creek

6W & 3.7S of Fairview, Lincoln, SD

Built 1950 Load: 9.4 t ADT: 50

327th Avenue

Poor

Over: Creek

1W & 8.2S of Reliance, Lyman, SD

Built 1940 Load: 9.4 t ADT: 10

27720 363rd Avenue

Poor

Over: Platte Creek

1.2S & 4.0W of Platte, Charles Mix, SD

Built 1977 Load: 9.5 t ADT: 48

40480 285 STR.

Poor

Over: CK

2N & 6.2W TRIPP, Hutchinson, SD

Built 1985 Load: 9.5 t ADT: 20

27310 BENSON RD

Poor

Over: TWELVE MILE CK

MILLTOWN, Hutchinson, SD

Built 1987 Load: 9.5 t ADT: 45

MAITLAND ROAD

Poor

Over: FALSE BOTTOM CK

0.7SW Christen & Maitland, Lawrence, SD

Built 1977 Load: 9.5 t ADT: 100

TOMAHAWK DR

Poor

Over: DRAINAGE CHANNEL

175'W Cntry Club Dr - RC, Pennington, SD

Built 1977 Load: 9.5 t ADT: 125

174TH ST

Poor

Over: CREEK

1S & 7.1W REDFIELD, Spink, SD

Built 1930 Load: 9.5 t ADT: 34

413th Avenue

Poor

Over: Pearl Creek

1.9N & 2E of Yale, Beadle, SD

Built 1945 Load: 9.7 t ADT: 56

227 ST

Poor

Over: CK

5S & 4.6E CARTHAGE, Miner, SD

Built 1925 Load: 9.7 t ADT: 61

383rd Avenue

Poor

Over: Cain Creek

4.5N & 4.0W of Wolsey, Beadle, SD

Built 1924 Load: 9.8 t ADT: 56

413TH Avenue

Poor

Over: Creek

1.2 S & 3 W Andover, Day, SD

Built 1930 Load: 9.8 t ADT: 12

192nd Street

Poor

Over: Hidewood Creek

1.3W & 2N of Estelline, Hamlin, SD

Built 1930 Load: 9.8 t ADT: 115

227th Street

Poor

Over: White Clay Creek

14.5N & 0.2W Murdo, Jones, SD

Built 1965 Load: 9.8 t ADT: 21

478th Avenue

Poor

Over: Trib. to E Brule Creek

6E & 1.2N of Beresford, Lincoln, SD

Built 1976 Load: 9.8 t ADT: 75

159TH AVE

Poor

Over: BOXELDER CK

1.6 W NEW UNDERWOOD, Pennington, SD

Built 1950 Load: 9.9 t ADT: 39

163 STREET

Poor

Over: SOUTH FORK YELLOW BANK R

3.7W & 2S ALBEE, Grant, SD

Built 1930 Load: 10.0 t ADT: 98

144 STREET

Poor

Over: NORTH FORK WHETSTONE RV

0.6E & 5N MILBANK, Grant, SD

Built 1965 Load: 10.0 t ADT: 52

161 STREET

Poor

Over: S Fork Yellow Bank River

4.6E ALBEE, Grant, SD

Built 1940 Load: 10.0 t ADT: 52

242 STREET

Poor

Over: CK

5.6E & 4N BELVIDERE, Jackson, SD

Built 1935 Load: 10.0 t ADT: 35

27620 457 AVE

Poor

Over: VERMILLION RV

4W & 0.8N CHANCELLOR, Turner, SD

Built 1985 Load: 10.0 t ADT: 25

10 Mile Road

Poor

Over: MEXICAN CK

7.4W & 10N PHILIP, Haakon, SD

Built 1950 Load: 10.1 t ADT: 58

160 STREET

Poor

Over: CK

1.1E & 1N LABOLT, Grant, SD

Built 1991 Load: 10.2 t ADT: 10

194th Street

Poor

Over: Dolph Creek

6W & 1S of Lake Norden, Hamlin, SD

Built 1960 Load: 10.3 t ADT: 38

272nd Street

Poor

Over: Beaver Creek

3.5W of Tea, Lincoln, SD

Built 1958 Load: 10.3 t ADT: 108

473RD AVENUE

Poor

Over: CK

10.1N & 2E BROOKINGS, Brookings, SD

Built 1977 Load: 10.4 t ADT: 92

38840 278 ST

Poor

Over: ANDES CK

2.0N & 3.6W OF ARMOUR, Douglas, SD

Built 1972 Load: 10.4 t ADT: 30

302 AVENUE

Poor

Over: OKOBOJO CK

3.7N & 2.5W ONIDA, Sully, SD

Built 1962 Load: 10.4 t ADT: 20

138th Street

Poor

Over: N. Fork Whetstone Rv

2.8E & 1.8S of Wilmot, Roberts, SD

Built 1965 Load: 10.6 t ADT: 35

ELMORE RD

Poor

Over: SPEARFISH CK

0.2KM WEST OF 14A, Lawrence, SD

Built 1901 Load: 10.7 t ADT: 50

468th Avenue

Poor

Over: Creek

4W & 0.2S of Corona, Roberts, SD

Built 1967 Load: 10.7 t ADT: 20

479TH AVENUE

Poor

Over: CK

2.2N & 1E WHITE, Brookings, SD

Built 1930 Load: 10.8 t ADT: 92

185 ST

Poor

Over: SHAEFER CK

5.3 E & 12 N MILLER, Hand, SD

Built 1930 Load: 10.8 t ADT: 25

474 AVE

Poor

Over: CK

3.0E & 5.8S TWIN BROOKS, Grant, SD

Built 1901 Load: 10.9 t ADT: 25

161 STREET

Poor

Over: S Fork Yellow Bank River

4.4E ALBEE, Grant, SD

Built 1940 Load: 10.9 t ADT: 52

TWNSHP RD 186TH ST

Poor

Over: COBB CK

4S & 5.1E CLEAR LAKE, Deuel, SD

Built 1950 Load: 11.0 t ADT: 45

231st Street

Poor

Over: Trib. to Jack Moore Crk

2.0N & 5.3W of Egan, Moody, SD

Built 1950 Load: 11.0 t ADT: 10

464th Avenue

Poor

Over: Creek

3W & 1.9N of Wilmot, Roberts, SD

Built 1950 Load: 11.0 t ADT: 20

206th Street

Poor

Over: Unnamed Creek

5.5E & 2N of Huron, Beadle, SD

Built 1930 Load: 11.1 t ADT: 39

448th Avenue

Poor

Over: Little Vermillion River

1.7N & 7E of Salem, McCook, SD

Built 1940 Load: 11.1 t ADT: 173

200TH STREET

Poor

Over: CK

3.5N & 4.7E WHITE, Brookings, SD

Built 1940 Load: 11.2 t ADT: 95

306 AVENUE

Poor

Over: KEYAPAHA RV

4.3S & 1W CLEARFIELD, Tripp, SD

Built 1982 Load: 11.2 t ADT: 150

OLD HWY 212

Poor

Over: CK

8.5N 21.8 E NEWELL, Butte, SD

Built 1950 Load: 11.3 t ADT: 47

414TH AVE.

Poor

Over: JIM CK

2.3S & 0.5W ARTESIAN, Sanborn, SD

Built 1930 Load: 11.4 t ADT: 120

295th Street

Poor

Over: Tributary to Blind Creek

2N & 3.6W of Beresford, Lincoln, SD

Built 1935 Load: 11.5 t ADT: 53

264 STREET

Poor

Over: OLD LODGE CK

2N & 4.8E IDEAL, Tripp, SD

Built 1968 Load: 11.5 t ADT: 49

Showing 5,051-5,100 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.