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

485TH AVENUE

Poor

Over: CK

1.5N & 7E WHITE, Brookings, SD

Built 1950 Load: 17.0 t ADT: 139

165TH ST

Poor

Over: James River

1.6 E. ASHTON, Spink, SD

Built 1955 Load: 17.0 t ADT: 146

401ST AVENUE

Poor

Over: NORTH BR TWELVE MILE CK

10 W & 1.2 N ETHAN, Davison, SD

Built 1925 Load: 17.1 t ADT: 53

38830 280 ST

Poor

Over: ANDES CK

0.5N 3.7W ARMOUR, Douglas, SD

Built 1950 Load: 17.1 t ADT: 206

25810 416 AVENUE

Poor

Over: JAMES RV

1.1S & 5W OF ALEXANDRIA, Hanson, SD

Built 1959 Load: 17.1 t ADT: 165

27440 BENSEN ROAD

Poor

Over: DRY CK

9.5E&0.6N PARKSTON, Hutchinson, SD

Built 1980 Load: 17.1 t ADT: 35

45670 273 ST

Poor

Over: ELCE CK

2N & 3.7E PARKER, Turner, SD

Built 1945 Load: 17.1 t ADT: 30

27380 458 AVE

Poor

Over: CAMP CK

1.1N & 5E PARKER, Turner, SD

Built 1930 Load: 17.1 t ADT: 31

31270 473RD AVE

Poor

Over: BRULE CK

1E & 14.7S BERESFORD, Union, SD

Built 1976 Load: 17.1 t ADT: 30

47320 304 STR

Poor

Over: CK

6S & 1.2E BERESFORD, Union, SD

Built 1970 Load: 17.1 t ADT: 43

47610 312TH ST

Poor

Over: CK

3E & 1N SPINK, Union, SD

Built 1992 Load: 17.1 t ADT: 50

48030 310 STR.

Poor

Over: EAST UNION CK

8.5S & 1.3E ALCESTER, Union, SD

Built 1948 Load: 17.1 t ADT: 40

44660 298th Street

Poor

Over: Trib. to Clay Creek

5.4W & 1S of Irene, Yankton, SD

Built 1940 Load: 17.1 t ADT: 25

148 STREET

Poor

Over: BIG SIOUX RV

13.9W & 1.5S MARVIN, Grant, SD

Built 1930 Load: 17.2 t ADT: 52

321 AVENUE

Poor

Over: CHAPELLE CK

0.3W & 10.17S HARROLD, Hughes, SD

Built 1963 Load: 17.2 t ADT: 99

476TH AVENUE

Poor

Over: SIX MILE CK

1.4S & 2W WHITE, Brookings, SD

Built 1950 Load: 17.3 t ADT: 92

30010 400th Avenue

Poor

Over: Choteau Creek

0.1S of Dante, Charles Mix, SD

Built 1958 Load: 17.4 t ADT: 205

WILCOX RD.

Poor

Over: EAST ELM CK

6.2N & 35.2E STURGIS, Meade, SD

Built 1966 Load: 17.4 t ADT: 15

45520 275 ST

Poor

Over: WEST FORK VERMILLION RV

2.2E PARKER, Turner, SD

Built 1952 Load: 17.4 t ADT: 758

IGLOO RD

Poor

Over: COAL CK

0.1 E IGLOO (SD298), Fall River, SD

Built 1940 Load: 17.5 t ADT: 20

487TH AVENUE

Poor

Over: TRIB TO BEAVER CK

2.1N VALLEY SPRINGS, Minnehaha, SD

Built 1958 Load: 17.6 t ADT: 39

352 AVENUE

Poor

Over: WILLOW CK

5.2S & 2E HERRICK, Gregory, SD

Built 1956 Load: 17.7 t ADT: 36

28220 432 AVE.

Poor

Over: CK

3.8N,1.0E OF MENNO, Hutchinson, SD

Built 1981 Load: 17.7 t ADT: 15

221ST STREET

Poor

Over: JAMES RV

3.4E JCT SD37 & SD32, Sanborn, SD

Built 1957 Load: 17.8 t ADT: 176

347TH AVE

Poor

Over: CK

8.5S & 2W REE HEIGHTS, Hand, SD

Built 1910 Load: 17.9 t ADT: 43

TWNSHP RD 484TH AV

Poor

Over: COBB CK

3.4 S 3.0 W GARY, Deuel, SD

Built 1945 Load: 18.0 t ADT: 10

269 STREET

Poor

Over: EAGLE NEST CK

4S & 2.4W WANBLEE, Jackson, SD

Built 1945 Load: 18.0 t ADT: 15

14TH AVE. N, WTN.

Poor

Over: BIG SIOUX RV

2 N 1.2W WATERTOWN, Codington, SD

Built 1974 Load: 18.1 t ADT: 4,970

455 AVENUE

Poor

Over: MAHONEY CK

3.3 S JCT SD 20 E, Codington, SD

Built 1940 Load: 18.1 t ADT: 1,167

400TH AVENUE

Poor

Over: CK

3 E MT VERNON, Davison, SD

Built 1945 Load: 18.1 t ADT: 20

485 AVENUE

Poor

Over: NORTH FORK YELLOW BANK R

7E & 4.6S MILBANK, Grant, SD

Built 1930 Load: 18.1 t ADT: 35

449 AVE

Poor

Over: CK

2.0 W ORLAND, Lake, SD

Built 1930 Load: 18.1 t ADT: 290

387th Avenue

Poor

Over: Creek

6.5S of Wolsey, Beadle, SD

Built 1922 Load: 18.2 t ADT: 56

205TH STREET

Poor

Over: SIX MILE CK

1.5S & 2.2W WHITE, Brookings, SD

Built 1930 Load: 18.2 t ADT: 92

IRR BIA RTE 5

Poor

Over: COUNSELOR CREEK

6.8 KM SE OF LOWER BRULE, Lyman, SD

Built 1965 Load: 18.2 t ADT: 663

201st Street

Poor

Over: Cain Creek

4.0N & 3.9W of Wolsey, Beadle, SD

Built 1926 Load: 18.3 t ADT: 56

206th Street

Poor

Over: Cain Creek

1S & 1.3E of Wolsey, Beadle, SD

Built 1930 Load: 18.3 t ADT: 56

393rd Avenue

Poor

Over: Creek

SW Edge of Broadland, Beadle, SD

Built 1924 Load: 18.3 t ADT: 213

192nd Street

Poor

Over: Creek

16N & 3.9W of Iroquois, Beadle, SD

Built 1928 Load: 18.3 t ADT: 33

219th Street

Poor

Over: Creek

11S & 2.5W of Iroquois, Beadle, SD

Built 1934 Load: 18.3 t ADT: 20

215th Street

Poor

Over: Creek

7S & 0.3W of Iroquois, Beadle, SD

Built 1932 Load: 18.3 t ADT: 11

295 STREET

Poor

Over: CK

14.5W 3.0S MARTIN, Bennett, SD

Built 1932 Load: 18.3 t ADT: 27

205 AVENUE

Poor

Over: CK

13.0W 2.8S MARTIN, Bennett, SD

Built 1932 Load: 18.3 t ADT: 37

30710 406th Avenue

Poor

Over: Trib. to Choteau Creek

4.1S of Avon, Bon Homme, SD

Built 1930 Load: 18.3 t ADT: 60

OLD HWY 212

Poor

Over: DRY CK

0.7 E OF NEWELL, Butte, SD

Built 1970 Load: 18.3 t ADT: 47

38080 291st Street

Poor

Over: Creek

1.0N & 1.2W of Lake Andes, Charles Mix, SD

Built 1935 Load: 18.3 t ADT: 48

Four Corners Road

Poor

Over: CHEYENNE RV

15.7W 4.4N MILESVILL, Haakon, SD

Built 1930 Load: 18.3 t ADT: 45

460th Avenue

Poor

Over: Lake Poinsett Outlet

8.2S & 1E of Castlewood, Hamlin, SD

Built 1960 Load: 18.3 t ADT: 66

28760 433 AVE.

Poor

Over: CK

1.6S,2.0E OF MENNO, Hutchinson, SD

Built 1935 Load: 18.3 t ADT: 35

274th Street

Poor

Over: Beaver Creek

4N & 0.1W of Lennox, Lincoln, SD

Built 1935 Load: 18.3 t ADT: 67

Showing 5,501-5,550 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.