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

466th Avenue

Poor

Over: Creek

1W & 0.1N of Wilmot, Roberts, SD

Built 1935 Load: 11.0 t ADT: 35

117th Street

Poor

Over: Jim Creek

9E & 2N of Sisseton, Roberts, SD

Built 1929 Load: 11.0 t ADT: 30

477th Avenue

Poor

Over: Creek

4E & 6.5S of Rosholt, Roberts, SD

Built 1966 Load: 11.0 t ADT: 25

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

45970 279 ST.

Poor

Over: VERMILLION RV

2S & 1.3W CHANCELLOR, Turner, SD

Built 1985 Load: 11.4 t ADT: 97

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

413th Avenue

Poor

Over: Middle Pearl Creek

5.2S & 4E of Cavour, Beadle, SD

Built 1930 Load: 11.6 t ADT: 119

477TH AVENUE

Poor

Over: DEER CK

1W & 1.1N BUSHNELL, Brookings, SD

Built 1930 Load: 11.6 t ADT: 92

482ND AVENUE

Poor

Over: Medary Creek

3.8N & 4W ELKTON, Brookings, SD

Built 1975 Load: 11.7 t ADT: 45

136TH PL

Poor

Over: SPRING CK

9E & 4.9N STURGIS, Meade, SD

Built 1955 Load: 11.7 t ADT: 15

2ND AVE (GARY)

Poor

Over: W Br Lac qui Parle River

SECOND AVE. GARY, Deuel, SD

Built 1930 Load: 11.8 t ADT: 50

175 ST

Poor

Over: CK

3S & 0.3E ROCKHAM, Hand, SD

Built 1978 Load: 11.8 t ADT: 35

369TH AVE

Poor

Over: SAND CK

13.7S VAYLAND, Hand, SD

Built 1932 Load: 11.8 t ADT: 37

462 AVE

Poor

Over: ROUND & BRANT LK

2.0W & 2.5N CHESTER, Lake, SD

Built 1977 Load: 11.8 t ADT: 131

HUETHER ROAD

Poor

Over: TRIB TO CHEYENNE RIVER

4.0W 5.3N CONATA, Pennington, SD

Built 1940 Load: 11.8 t ADT: 25

WHITE BUTTE ROAD

Poor

Over: LODGEPOLE CK

4.5E 13.9 N BISON, Perkins, SD

Built 1965 Load: 11.8 t ADT: 163

416th Avenue

Poor

Over: Creek

3 W & 2 N of Pierpont, Day, SD

Built 1932 Load: 11.9 t ADT: 24

354 AVENUE

Poor

Over: PONCA CK

0.2W & 3.6S ST. CHARLES, Gregory, SD

Built 1952 Load: 11.9 t ADT: 189

209TH STREET

Poor

Over: CK

2N & 1.5E BUSHNELL, Brookings, SD

Built 1913 Load: 12.0 t ADT: 92

197th Street

Poor

Over: Creek

2.5W & 2N of Broadland, Beadle, SD

Built 1928 Load: 12.1 t ADT: 56

244 ST

Poor

Over: FIRESTEEL CK

1S & 2.5W STORLA, Aurora, SD

Built 1940 Load: 12.2 t ADT: 33

245 ST

Poor

Over: FIRESTEEL CK

5.3E 8N PLANKINTON, Aurora, SD

Built 1940 Load: 12.2 t ADT: 33

191st Street

Poor

Over: Turtle Creek

11N & 2.9E of Wessington, Beadle, SD

Built 1913 Load: 12.2 t ADT: 56

193rd Street

Poor

Over: Creek

9N & 3.8E of Wessington, Beadle, SD

Built 1930 Load: 12.2 t ADT: 56

379th Avenue

Poor

Over: Creek

12.8S & 6W of Wolsey, Beadle, SD

Built 1928 Load: 12.2 t ADT: 69

193rd Street

Poor

Over: Unnamed Creek

0.8W & 3S of Bloomfield, Beadle, SD

Built 1940 Load: 12.2 t ADT: 56

201ST ST

Poor

Over: Shue Creek

7N 0.9E Cavour, Beadle, SD

Built 1922 Load: 12.2 t ADT: 56

411th Avenue

Poor

Over: Middle Pearl Creek

5.1S & 2E of Cavour, Beadle, SD

Built 1920 Load: 12.2 t ADT: 56

203rd Street

Poor

Over: Pearl Creek

5N & 4.9W of Iroquois, Beadle, SD

Built 1924 Load: 12.2 t ADT: 56

42090 303rd Street

Poor

Over: Snatch Creek

3.9E & 1N of Tyndall, Bon Homme, SD

Built 1910 Load: 12.2 t ADT: 60

30420 426th Avenue

Poor

Over: Beaver Creek

1W & 1.8N of Tabor, Bon Homme, SD

Built 1930 Load: 12.2 t ADT: 60

30480 428th Avenue

Poor

Over: Beaver Creek

2W & 4.8S of Lesterville, Bon Homme, SD

Built 1940 Load: 12.2 t ADT: 130

102nd Street

Poor

Over: Elm Lake

8.5W & 5N of Frederick, Brown, SD

Built 1935 Load: 12.2 t ADT: 33

407th Avenue

Poor

Over: Mud Creek

4.4S & 1E of Groton, Brown, SD

Built 1935 Load: 12.2 t ADT: 98

OLD HWY 212

Poor

Over: SULPHUR CK

20.2E 6.7N NEWELL, Butte, SD

Built 1940 Load: 12.2 t ADT: 20

38710 294th Street

Poor

Over: Creek

1.0S & 0.9W of Ravina, Charles Mix, SD

Built 1930 Load: 12.2 t ADT: 48

39460 289th Street

Poor

Over: Creek

8.0N & 0.4W of Wagner, Charles Mix, SD

Built 1940 Load: 12.2 t ADT: 48

HARMON DRIVE

Poor

Over: MITCHELL LK

2.1W & 4.0N OF MITCHELL, Davison, SD

Built 2000 Load: 12.2 t ADT: 350

130th Street

Poor

Over: Snake Creek

10.6E & 4N of Ipswich, Edmunds, SD

Built 1980 Load: 12.2 t ADT: 31

369th Avenue

Poor

Over: Unnamed Creek

11E & 7.4N of Ipswich, Edmunds, SD

Built 1980 Load: 12.2 t ADT: 31

COUNTY RD (SD 298)

Poor

Over: BURLINGTON NORTHERN RR

0.2 E IGLOO BHOD RD, Fall River, SD

Built 1945 Load: 12.2 t ADT: 20

438th Avenue

Poor

Over: BN Railroad

3.5W & 2.1S of Hazel, Hamlin, SD

Built 1936 Load: 12.2 t ADT: 200

ADAMS STREET

Poor

Over: CK

ADAMS ST. BLUNT, Hughes, SD

Built 1925 Load: 12.2 t ADT: 20

310 AVENUE

Poor

Over: NORTH MEDICINE CK

1.0E & 0.5N BLUNT, Hughes, SD

Built 1934 Load: 12.2 t ADT: 33

Showing 5,251-5,300 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.