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

41840 280 ST.

Poor

Over: DRY CK

4S & 8.4E PARKSTON, Hutchinson, SD

Built 1941 Load: 12.2 t ADT: 69

41910 283 ST.

Poor

Over: LONETREE CK

7.0S,9.1E PARKSTON, Hutchinson, SD

Built 1964 Load: 12.2 t ADT: 26

286th Street

Poor

Over: Long Creek

7S & 0.5W of Lennox, Lincoln, SD

Built 1940 Load: 12.2 t ADT: 30

468th Avenue

Poor

Over: Snake Creek

7.7S & 2E of Lennox, Lincoln, SD

Built 1935 Load: 12.2 t ADT: 56

476th Avenue

Poor

Over: S Fork of Beaver Creek

1.8S & 4W of Canton, Lincoln, SD

Built 1963 Load: 12.2 t ADT: 117

River Road

Poor

Over: Creek

13.5S & 7.1W of Presho, Lyman, SD

Built 1965 Load: 12.2 t ADT: 16

304th Avenue

Poor

Over: Creek

1W & 13.1N of Presho, Lyman, SD

Built 1966 Load: 12.2 t ADT: 10

Shades Road

Poor

Over: Creek

13.5S & 2.7E of Kennebec, Lyman, SD

Built 1955 Load: 12.2 t ADT: 10

418th Avenue

Poor

Over: Spain & Langford Ditch

1W & 6.2N of Langford, Marshall, SD

Built 1979 Load: 12.2 t ADT: 50

237th Street

Poor

Over: Big Sioux River

3.5S & 2.6W of Egan, Moody, SD

Built 1976 Load: 12.2 t ADT: 35

TOWN STREET (US16)

Poor

Over: ABANDON LINE RR

OLD HWY16-N EDGE TOWN- HC, Pennington, SD

Built 1930 Load: 12.2 t ADT: 1,000

BENNET ROAD

Poor

Over: BOXELDER CK

.5N1E STPAT EXIT BOXELDER, Pennington, SD

Built 1973 Load: 12.2 t ADT: 881

450th Avenue

Poor

Over: Little Minnesota River

5W & 1N of Claire City, Roberts, SD

Built 1950 Load: 12.2 t ADT: 35

454th Avenue

Poor

Over: Creek

4.6S & 1W of Claire City, Roberts, SD

Built 1950 Load: 12.2 t ADT: 25

118th Street

Poor

Over: Little Minnesota River

2.5E & 0.5N of Sisseton, Roberts, SD

Built 1939 Load: 12.2 t ADT: 68

464th Avenue

Poor

Over: N. Fork Whetstone Rv

3W & 3.5N of Wilmot, Roberts, SD

Built 1929 Load: 12.2 t ADT: 20

138th Street

Poor

Over: Creek

1.8S & 3W of Wilmot, Roberts, SD

Built 1938 Load: 12.2 t ADT: 10

465th Avenue

Poor

Over: Creek

2W & 0.5S of Wilmot, Roberts, SD

Built 1945 Load: 12.2 t ADT: 31

466th Avenue

Poor

Over: Creek

2N & 1W of Wilmot, Roberts, SD

Built 1940 Load: 12.2 t ADT: 38

468th Avenue

Poor

Over: Jim Creek

10E & 0.5S of Sisseton, Roberts, SD

Built 1965 Load: 12.2 t ADT: 175

469th Avenue

Poor

Over: Creek

3W of Corona, Roberts, SD

Built 1935 Load: 12.2 t ADT: 17

104th Street

Poor

Over: Creek

4.5E & 1N of Rosholt, Roberts, SD

Built 1940 Load: 12.2 t ADT: 25

220 ST.

Poor

Over: CK

0.4E 13N ARTESIAN, Sanborn, SD

Built 1920 Load: 12.2 t ADT: 56

151ST ST

Poor

Over: Snake Creek

5.8W 3.0S MANSFIELD, Spink, SD

Built 1935 Load: 12.2 t ADT: 31

151ST ST

Poor

Over: SNAKE CREEK

3N 5.1W NORTHVILLE, Spink, SD

Built 1935 Load: 12.2 t ADT: 31

187TH ST

Poor

Over: TURTLE CREEK

7.7W 4.0S TULARE, Spink, SD

Built 1912 Load: 12.2 t ADT: 38

165TH ST

Poor

Over: South Fork Snake Creek

1S 3.1W ATHOL, Spink, SD

Built 1925 Load: 12.2 t ADT: 55

182nd Street

Poor

Over: TURTLE CREEK

1N 5W TULARE, Spink, SD

Built 1935 Load: 12.2 t ADT: 22

382ND AVE

Poor

Over: CREEK

0.5N ATHOL, Spink, SD

Built 1909 Load: 12.2 t ADT: 85

164TH ST

Poor

Over: CREEK

1.2N 1.9W ASHTON, Spink, SD

Built 1930 Load: 12.2 t ADT: 31

162ND ST

Poor

Over: James River

3.3N 1.6E ASHTON, Spink, SD

Built 1935 Load: 12.2 t ADT: 55

390TH AVE

Poor

Over: James River

4.0E 2.6N REDFIELD, Spink, SD

Built 1930 Load: 12.2 t ADT: 55

392ND AVE

Poor

Over: MUD CREEK

3.4W 1.8N BRENTFORD, Spink, SD

Built 1935 Load: 12.2 t ADT: 44

186th Street

Poor

Over: FOSTER CREEK

4N & 0.4W BLOOMFIELD, Spink, SD

Built 1915 Load: 12.2 t ADT: 31

311 AVENUE

Poor

Over: DOG EAR CK

7E & 5.8N WITTEN, Tripp, SD

Built 1963 Load: 12.2 t ADT: 31

45860 278 ST

Poor

Over: VERMILLION RV

1S & 2.3W CHANCELLOR, Turner, SD

Built 1940 Load: 12.2 t ADT: 65

30330 472 AVE.

Poor

Over: CK

5.3S BERESFORD, Union, SD

Built 1973 Load: 12.2 t ADT: 30

47230 305 STR.

Poor

Over: CK

7S & 0.3E BERESFORD, Union, SD

Built 1987 Load: 12.2 t ADT: 45

47230 306 STR.

Poor

Over: BRULE CK

8S & 0.3E BERESFORD, Union, SD

Built 1979 Load: 12.2 t ADT: 35

47340 306 STR.

Poor

Over: CK

8S & 1.4E BERESFORD, Union, SD

Built 1948 Load: 12.2 t ADT: 35

31070 476TH AVE

Poor

Over: CK

4E & 12.7S BERESFORD, Union, SD

Built 1963 Load: 12.2 t ADT: 35

30999 477TH AVE

Poor

Over: CK

9S & 2W ALCESTER, Union, SD

Built 1989 Load: 12.2 t ADT: 300

30010 478 AVE.

Poor

Over: CK

0.5W & 0.9N ALCESTER, Union, SD

Built 1982 Load: 12.2 t ADT: 45

30040 478 AVE.

Poor

Over: DRAINAGE DITCH

0.5W & 0.6N ALCESTER, Union, SD

Built 1983 Load: 12.2 t ADT: 45

47840 300TH ST

Poor

Over: DRAINAGE DITCH

1N & 0.6W ALCESTER, Union, SD

Built 1997 Load: 12.2 t ADT: 40

44960 296 ST

Poor

Over: Turkey Creek

2.4 W 1.0 N Irene, Yankton, SD

Built 1979 Load: 12.2 t ADT: 75

376th Avenue

Poor

Over: Cain Creek

2E & 0.4S of Wessington, Beadle, SD

Built 1954 Load: 12.3 t ADT: 56

133rd Street

Poor

Over: Creek

2.5S & 1.8E of Pierpont, Day, SD

Built 1935 Load: 12.4 t ADT: 10

42130 CO. RD. 11

Poor

Over: PLUM CK

1.3N,11.3E PARKSTON, Hutchinson, SD

Built 1935 Load: 12.4 t ADT: 69

243rd Avenue

Poor

Over: West Pipestone Creek

13.0S & 0.2E of Flandreau, Moody, SD

Built 1990 Load: 12.4 t ADT: 50

Showing 5,301-5,350 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.