State profile · Above median Poor share

South Dakota bridge safety

Condition ratings, load ratings, and Poor-condition data for every public highway bridge in South Dakota, based on the FHWA National Bridge Inventory.

5,905
Public bridges
31.9%
Good condition
16.2%
Poor condition

Data updated May 2026

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 whose lowest applicable component is rated 0-4

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 - Poor-condition share 54.1%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.

Condition Distribution

South Dakota34.6%47.8%17.6%GoodFairPoor
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 by Poor-condition share (lower share = better)

States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below South Dakota on the same metric.

GU

Guam

15.25% top marginal rate
Structure
Progressive
Burden @ $100K
$59

WV

West Virginia

16.02% top marginal rate
Structure
Progressive
Burden @ $100K
$7,679
Selected

SD

South Dakota

16.24% top marginal rate
Structure
Progressive
Burden @ $100K
$5,905

IA

Iowa

20.01% top marginal rate
Structure
Progressive
Burden @ $100K
$20,753

VI

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 the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.

483 AVENUE

Poor

Over: WHETSTONE RV

4.8E & 3.2N MILBANK, Grant, SD

Built 1962 Load: 0.9 t ADT: 25

202ND ST.

Poor

Over: BEAR BUTTE CK

5.3E BEAR BUTTE, Meade, SD

Built 2000 Load: 0.9 t ADT: 50

45980 303 ST.

Poor

Over: VERMILLION RV

6S & 7.8E IRENE, Clay, SD

Built 1909 Load: 1.8 t ADT: 15

460th Avenue

Poor

Over: Big Coulee Creek

4S & 2W of Peever, Roberts, SD

Built 1950 Load: 2.2 t ADT: 22

197TH ST

Poor

Over: TURTLE CK

1N & 1E ST LAWRENCE, Hand, SD

Built 1925 Load: 2.5 t ADT: 25

242 ST

Poor

Over: CK

1.8E 11.0N PLANKINTON, Aurora, SD

Built 1917 Load: 2.7 t ADT: 101

All Bridges in South Dakota

411TH AVENUE

Poor

Over: CK

4.7 N & 2 E MITCHELL, Davison, SD

Built 1935 Load: 4.1 t ADT: 40

41630 268 ST.

Poor

Over: TWELVE MILE CK

8.0N,6.3E PARKSTON, Hutchinson, SD

Built 1971 Load: 4.2 t ADT: 69

361ST AVE

Poor

Over: WOLF CK

7.5N & 1E MILLER, Hand, SD

Built 1913 Load: 4.4 t ADT: 43

125th Street

Poor

Over: James River

2.5S & 2.4E of Columbia, Brown, SD

Built 1920 Load: 4.5 t ADT: 98

MAIL RD

Poor

Over: INDIAN CK

2W 5N NISLAND, Butte, SD

Built 1940 Load: 4.5 t ADT: 22

VIKEN ROAD

Poor

Over: HORSE CK

1 S 3 W OF NEWELL, Butte, SD

Built 1919 Load: 4.5 t ADT: 47

46600 313 ST.

Poor

Over: CK

7 S & 1.1 E of Hub City, Clay, SD

Built 1925 Load: 4.5 t ADT: 15

481 AVENUE

Poor

Over: NORTH FORK YELLOW BANK R

3E & 3.1S MILBANK, Grant, SD

Built 1925 Load: 4.5 t ADT: 137

481 AVENUE

Poor

Over: CK

1W & 3.2S ALBEE, Grant, SD

Built 1930 Load: 4.5 t ADT: 40

2nd Avenue

Poor

Over: BN Railroad

2nd Ave. Big Stone City, Grant, SD

Built 1914 Load: 4.5 t ADT: 2,560

366 AVE

Poor

Over: WOLF CK

6 E & 8.4 N MILLER, Hand, SD

Built 1915 Load: 4.5 t ADT: 10

296th Street

Poor

Over: East Brule Creek

1N & 8.5E of Beresford, Lincoln, SD

Built 1950 Load: 4.5 t ADT: 20

BREHM RD.

Poor

Over: CK

29E & 15.5S STURGIS, Meade, SD

Built 1935 Load: 4.5 t ADT: 10

WHITETAIL RD.

Poor

Over: BEAVER DAM CK

6 E 12 N WHITE OWL, Meade, SD

Built 1955 Load: 4.5 t ADT: 10

COUNTY RD

Poor

Over: TURKEY RIDGE CK

5W & 6.2N VIBORG, Turner, SD

Built 1913 Load: 4.5 t ADT: 30

45530 273 ST

Poor

Over: EAST FORK VERMILLION RV

2N & 2.3E PARKER, Turner, SD

Built 1910 Load: 4.5 t ADT: 30

41090 296th Street

Poor

Over: Trib. to Emanuel Creek

6N & 3.7E of Avon, Bon Homme, SD

Built 1935 Load: 4.6 t ADT: 60

133rd Street

Poor

Over: Creek

4.6E of Groton, Brown, SD

Built 1935 Load: 4.7 t ADT: 98

461 Ave.

Poor

Over: VERMILLION RV

1W & 1.2S CENTERVILLE, Turner, SD

Built 1910 Load: 4.7 t ADT: 50

391 AVE

Poor

Over: WEST FIRESTEEL CK

5E 6.8N PLANKINTON, Aurora, SD

Built 1925 Load: 4.8 t ADT: 33

185TH ST

Poor

Over: TURTLE CK

2S 7.5W TULARE, Spink, SD

Built 1903 Load: 4.8 t ADT: 31

361ST AVE

Poor

Over: TURTLE CK

1E & 5.8S MILLER, Hand, SD

Built 1930 Load: 4.9 t ADT: 10

207TH ST

Poor

Over: REDSTONE CK

8.1W DESMET, Kingsbury, SD

Built 1935 Load: 4.9 t ADT: 15

271 STREET

Poor

Over: COTTONWOOD CK

0.8E & 1.9N WITTEN, Tripp, SD

Built 1945 Load: 4.9 t ADT: 50

29280 431st Avenue

Poor

Over: James River

7.2N & 1E of Lesterville, Yankton, SD

Built 1959 Load: 4.9 t ADT: 315

227 AVENUE

Poor

Over: FRANKLIN CK

2W & 3.4N KADOKA, Jackson, SD

Built 1940 Load: 5.0 t ADT: 30

234TH STREET

Poor

Over: Trib to Rapid Ck

3.4 N FARMINGDALE, Pennington, SD

Built 1930 Load: 5.0 t ADT: 15

29620 396th Avenue

Poor

Over: Choteau Creek

0.8N & 1.0E of Wagner, Charles Mix, SD

Built 1930 Load: 5.1 t ADT: 48

42480 302nd Street

Poor

Over: Beaver Creek

4N & 2.1W of Tabor, Bon Homme, SD

Built 1925 Load: 5.2 t ADT: 60

398TH AVENUE

Poor

Over: ENEMY CK

11W & 3.7 S MITCHELL, Davison, SD

Built 1915 Load: 5.2 t ADT: 64

294th Street

Poor

Over: Garden Ck

1.5W & 2.9S Lake Andes, Charles Mix, SD

Built 1940 Load: 5.3 t ADT: 20

IDLEHURST LANE

Poor

Over: RAPID CK

0.8SW CANYON LK DAM - RC, Pennington, SD

Built 1972 Load: 5.3 t ADT: 25

39740 296th Street

Poor

Over: Creek

1.0N & 2.4E of Wagner, Charles Mix, SD

Built 1912 Load: 5.4 t ADT: 48

172 STREET

Poor

Over: CK

3.6E 1.0N HENRY, Codington, SD

Built 1940 Load: 5.4 t ADT: 73

454 AVENUE

Poor

Over: Indian River

10.7W & 4.3S MARVIN, Grant, SD

Built 1936 Load: 5.4 t ADT: 20

142 STREET

Poor

Over: CK

4.2E & 4.5N MARVIN, Grant, SD

Built 1958 Load: 5.4 t ADT: 52

117th Street

Poor

Over: Creek

2.7W & 2N of Sisseton, Roberts, SD

Built 1965 Load: 5.4 t ADT: 20

107th Street

Poor

Over: Little Minnesota River

1.5S & 1E of Claire City, Roberts, SD

Built 1950 Load: 5.4 t ADT: 30

475th Avenue

Poor

Over: N. Fork Whetstone Rv

3E & 0.2N of Corona, Roberts, SD

Built 1967 Load: 5.4 t ADT: 25

141st Street

Poor

Over: N. Fork Whetstone Rv

3.5E & 0.1N of Corona, Roberts, SD

Built 1935 Load: 5.4 t ADT: 38

405th Avenue

Poor

Over: Creek

3.3S & 1W of Groton, Brown, SD

Built 1935 Load: 5.5 t ADT: 98

113th Street

Poor

Over: Spain Ditch

0.5N & 2.1E of Amherst, Marshall, SD

Built 1935 Load: 5.5 t ADT: 35

279 STREET

Poor

Over: WEST BR BULL CK

5.5E 6.75N COLOME, Tripp, SD

Built 1955 Load: 5.5 t ADT: 55

427th Avenue

Poor

Over: Wild Rice Creek

8.8N & 4E of Britton, Marshall, SD

Built 1960 Load: 5.8 t ADT: 35

378 AVE

Poor

Over: WEST FIRESTEEL CK

8.5N 4.7E WHITE LAKE, Aurora, SD

Built 1936 Load: 6.1 t ADT: 62

201st Street

Poor

Over: Cain Creek

4.0N & 1.9W of Wolsey, Beadle, SD

Built 1910 Load: 6.1 t ADT: 56

29160 420th Avenue

Poor

Over: Dawson Creek

3W & 0.4N of Scotland, Bon Homme, SD

Built 1915 Load: 6.1 t ADT: 60

180th Street

Poor

Over: Trib. to Big Sioux River

3N & 0.9W of Castlewood, Hamlin, SD

Built 1930 Load: 6.1 t ADT: 25

113th Street

Poor

Over: Crow Creek

3S & 3.6W of Britton, Marshall, SD

Built 1935 Load: 6.1 t ADT: 30

221st Street

Poor

Over: Spring Creek

2.2W & 2N of Ward, Moody, SD

Built 1915 Load: 6.1 t ADT: 69

Showing 5,051-5,100 of 5,905 bridges

Related

All states → | National rankings → | Understanding conditions → | Retired SD term explained →
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.

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). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.

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.

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.