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

161ST STREET

Poor

Over: CREEK

9.1W TURTON, Spink, SD

Built 1930 Load: 15.2 t ADT: 100

318 AVENUE

Poor

Over: KEYA PAHA RV

1.5W & 1.5N WEWELA, Tripp, SD

Built 1945 Load: 15.2 t ADT: 50

47960 312TH ST

Poor

Over: WEST UNION CK

11.5S & 0.6E ALCESTER, Union, SD

Built 1986 Load: 15.2 t ADT: 40

30820 480 AVE.

Poor

Over: CK

1E & 6.2S ALCESTER, Union, SD

Built 1935 Load: 15.2 t ADT: 40

29650 426th Avenue

Poor

Over: Prairie Creek

2E & 3.5S of Scotland, Bon Homme, SD

Built 1925 Load: 15.3 t ADT: 60

484th Avenue

Poor

Over: Trib. to Pattee Creek

3.5W & 1.1N of Hudson, Lincoln, SD

Built 1935 Load: 15.3 t ADT: 50

29210 421st Avenue

Poor

Over: Dawson Creek

3W & 0.1S of Scotland, Bon Homme, SD

Built 1925 Load: 15.4 t ADT: 56

228 ST

Poor

Over: ROCK CK

5.0N & 6.3W HOWARD, Miner, SD

Built 1930 Load: 15.4 t ADT: 20

359TH AVE

Poor

Over: CK

1W & 2.4S MILLER, Hand, SD

Built 1930 Load: 15.5 t ADT: 15

221 STREET

Poor

Over: SAND CK

0.1W JCT US 281, Jerauld, SD

Built 1934 Load: 15.5 t ADT: 275

451st Avenue

Poor

Over: Trib. to E Fork Verm Rv

W. City Limit - Montrose, McCook, SD

Built 1930 Load: 15.5 t ADT: 66

214th Street

Poor

Over: Silver Creek

12.2W of Virgil, Beadle, SD

Built 1930 Load: 15.7 t ADT: 120

207TH STREET

Poor

Over: CK

5N & 1.3W BROOKINGS, Brookings, SD

Built 1958 Load: 15.7 t ADT: 32

FAS 6247

Poor

Over: Bear Creek

0.7 W 3.1 N LANTRY, Dewey, SD

Built 1960 Load: 15.7 t ADT: 103

287 STREET

Poor

Over: CK

1.8E 1.2S COLOME, Tripp, SD

Built 1935 Load: 15.7 t ADT: 55

CHANCE ROAD

Poor

Over: RABBIT CK

15.7S 3.4E BISON, Perkins, SD

Built 1950 Load: 15.8 t ADT: 26

468TH AVENUE

Poor

Over: CK

13.9N & 3W BROOKINGS, Brookings, SD

Built 1930 Load: 15.9 t ADT: 92

THUNDERHEAD FALLS

Poor

Over: RAPID CK

0.9E 1.5S JOHNSON SD, Pennington, SD

Built 1972 Load: 15.9 t ADT: 218

30680 432nd Avenue

Poor

Over: Marne Creek

3W & 2.8S of Utica, Yankton, SD

Built 1940 Load: 15.9 t ADT: 10

300 STREET

Poor

Over: SHADY CK

14.7W & 2.75N WEWELA, Tripp, SD

Built 1966 Load: 16.0 t ADT: 31

418th Avenue

Poor

Over: Antelope Creek

4.8N & 1W of Pierpont, Day, SD

Built 1928 Load: 16.1 t ADT: 15

206TH STREET

Poor

Over: REDSTONE CK

6 S & 1.9 E BANCROFT, Kingsbury, SD

Built 1940 Load: 16.1 t ADT: 27

45650 275 ST

Poor

Over: EAST FORK VERMILLION RV

3.5E PARKER, Turner, SD

Built 1958 Load: 16.1 t ADT: 747

W 23RD STREET

Poor

Over: MARNE CREEK

W 23RD STREET - YANKTON, Yankton, SD

Built 1976 Load: 16.1 t ADT: 3,980

41590 289 ST.

Poor

Over: Dawson Creek

2 S & 4.5 E TRIPP, Hutchinson, SD

Built 1937 Load: 16.2 t ADT: 45

203 A STREET

Poor

Over: SIX MILE CK

1.2W WHITE, Brookings, SD

Built 1940 Load: 16.3 t ADT: 92

133rd Street

Poor

Over: Creek

2.2E of Groton, Brown, SD

Built 1935 Load: 16.3 t ADT: 98

STATE PARK RD

Poor

Over: CENTER LAKE INLET

8.4E 2.7N OF CUSTER, Custer, SD

Built 1950 Load: 16.3 t ADT: 1,000

STATE PARK RD

Poor

Over: CK

10.8E 1S CUSTER, Custer, SD

Built 1950 Load: 16.3 t ADT: 5

TWNSHP RD 483RD AV

Poor

Over: CK

7E & 5.6N TUNERVILLE, Deuel, SD

Built 1930 Load: 16.3 t ADT: 25

39530 271 ST

Poor

Over: CK

2.0N,6.3E OF CORSICA, Douglas, SD

Built 1980 Load: 16.3 t ADT: 25

147 STREET

Poor

Over: CK

6.5W & 2N MILBANK, Grant, SD

Built 1926 Load: 16.3 t ADT: 100

477 AVENUE

Poor

Over: CK

5W & 4.9N ALBEE, Grant, SD

Built 1965 Load: 16.3 t ADT: 18

480 AVENUE

Poor

Over: CK

2W & 4.1N ALBEE, Grant, SD

Built 1969 Load: 16.3 t ADT: 35

482 AVENUE

Poor

Over: NORTH FORK YELLOW BANK R

8.3N ALBEE, Grant, SD

Built 1930 Load: 16.3 t ADT: 258

357TH AVE

Poor

Over: CK

3W & 4.1 S MILLER, Hand, SD

Built 1926 Load: 16.3 t ADT: 10

281st Street

Poor

Over: Long Creek

2S & 0.3E of Lennox, Lincoln, SD

Built 1935 Load: 16.3 t ADT: 45

471st Avenue

Poor

Over: Saddle Creek

1W & 7.5S of Worthing, Lincoln, SD

Built 1935 Load: 16.3 t ADT: 45

HAMMERQUIST ROAD

Poor

Over: RAPID CK

1.2W,0.5N,FARMINGDALE, Pennington, SD

Built 1916 Load: 16.3 t ADT: 54

467th Avenue

Poor

Over: Creek

0.6N of Wilmot, Roberts, SD

Built 1968 Load: 16.3 t ADT: 165

476th Avenue

Poor

Over: Big Slough Creek

3E & 1.4N of Rosholt, Roberts, SD

Built 1930 Load: 16.3 t ADT: 22

477th Avenue

Poor

Over: Big Slough Creek

4E & 1.1N of Rosholt, Roberts, SD

Built 1955 Load: 16.3 t ADT: 22

48050 311TH ST

Poor

Over: EAST UNION CK

9.5S & 1.5E ALCESTER, Union, SD

Built 1950 Load: 16.3 t ADT: 110

220 STREET

Poor

Over: CK

1W 1N ALPENA, Jerauld, SD

Built 1930 Load: 16.4 t ADT: 42

I-90 SERVICE ROAD

Poor

Over: SPRING CK

2.5 MI. SE WHITEWOOD, Lawrence, SD

Built 1938 Load: 16.5 t ADT: 335

242nd Street

Poor

Over: Big Sioux River

2.4S of Trent, Moody, SD

Built 1983 Load: 16.5 t ADT: 20

463rd Avenue

Poor

Over: Creek

3.8S & 4W of Wilmot, Roberts, SD

Built 1966 Load: 16.5 t ADT: 30

257TH STREET

Poor

Over: TRIB TO BEAVER CK

2.7E & 4S GARRETSON, Minnehaha, SD

Built 1935 Load: 16.6 t ADT: 30

483RD AVENUE

Poor

Over: TRIB TO SPLIT ROCK CK

2.9N & 1E CORSON, Minnehaha, SD

Built 1937 Load: 16.8 t ADT: 28

MOCCASIN PARK RD

Poor

Over: WHITE CLAY CREEK

0.36 KM W OF SH 407, Oglala Lakota, SD

Built 1975 Load: 16.9 t ADT: 50

Showing 5,451-5,500 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.