State profile · Above national median SD

South Dakota bridge safety

Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in South Dakota — drawn straight from the FHWA National Bridge Inventory.

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

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 rated 0-4

Structurally Deficient

16.2%

959 bridges flagged for repair priority

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 — Structurally deficient share 54.1%
National avg

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

Condition Distribution

Bridge inventory deck-condition mix — South Dakota (FHWA NBI)

South Dakota31.922099915325997%44.06435224386113%16.240474174428453%16.240474174428453%GoodFairPoorStructurally Deficient
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 on the structurally deficient leaderboard (lower share = better)

States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below South Dakota on the same metric.

66

Guam

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

54

West Virginia

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

46

South Dakota

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

19

Iowa

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

78

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 composite NBI rating. Each is inspected at least every 24 months.

483 AVENUE

Structurally Deficient

Over: WHETSTONE RV

4.8E & 3.2N MILBANK, Grant, SD

Built 1962 Load: 0.9 t ADT: 25

202ND ST.

Structurally Deficient

Over: BEAR BUTTE CK

5.3E BEAR BUTTE, Meade, SD

Built 2000 Load: 0.9 t ADT: 50

45980 303 ST.

Structurally Deficient

Over: VERMILLION RV

6S & 7.8E IRENE, Clay, SD

Built 1909 Load: 1.8 t ADT: 15

460th Avenue

Structurally Deficient

Over: Big Coulee Creek

4S & 2W of Peever, Roberts, SD

Built 1950 Load: 2.2 t ADT: 22

197TH ST

Structurally Deficient

Over: TURTLE CK

1N & 1E ST LAWRENCE, Hand, SD

Built 1925 Load: 2.5 t ADT: 25

242 ST

Structurally Deficient

Over: CK

1.8E 11.0N PLANKINTON, Aurora, SD

Built 1917 Load: 2.7 t ADT: 101

All Bridges in South Dakota

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

205 AVENUE

Poor

Over: CK

13.0W 2.8S MARTIN, Bennett, SD

Built 1932 Load: 18.3 t ADT: 37

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

476th Avenue

Poor

Over: Nine Mile Creek

1.2S of Harrisburg, Lincoln, SD

Built 1971 Load: 18.3 t ADT: 45

241st Street

Poor

Over: Trib. to Medicine Creek

0.9W of Kennebec, Lyman, SD

Built 1930 Load: 18.3 t ADT: 45

BEAR BUTTE RD.

Poor

Over: COTTONWOOD CK

2 E & 10.8 N STURGIS, Meade, SD

Built 1935 Load: 18.3 t ADT: 33

226th Street

Poor

Over: Spring Creek

3S & 6.8W of Ward, Moody, SD

Built 1978 Load: 18.3 t ADT: 50

481st Avenue

Poor

Over: Brookfield Creek

5.9S of Flandreau, Moody, SD

Built 1940 Load: 18.3 t ADT: 397

481st Avenue

Poor

Over: West Pipestone Creek

13.2S of Flandreau, Moody, SD

Built 1968 Load: 18.3 t ADT: 314

224th Street

Poor

Over: Spring Creek

1S & 5.2W of Ward, Moody, SD

Built 1930 Load: 18.3 t ADT: 45

104th Street

Poor

Over: Little Minnesota River

1W & 1.5N of Claire City, Roberts, SD

Built 1967 Load: 18.3 t ADT: 35

164TH ST

Poor

Over: S. FORK SNAKE CREEK

4.6 W ATHOL, Spink, SD

Built 1964 Load: 18.3 t ADT: 130

377TH AVE

Poor

Over: TURTLE CREEK

7W 1.6S TULARE, Spink, SD

Built 1965 Load: 18.3 t ADT: 78

169TH ST

Poor

Over: CREEK

4.0N 1.2W FRANKFORT, Spink, SD

Built 1935 Load: 18.3 t ADT: 31

266 ST IDEAL ROAD

Poor

Over: OWL CK

4.8W IDEAL, Tripp, SD

Built 1955 Load: 18.3 t ADT: 50

45060 283 ST

Poor

Over: TURKEY RIDGE CK

0.2N & 5.4W HURLEY, Turner, SD

Built 1958 Load: 18.3 t ADT: 66

27690 458 AVE

Poor

Over: ELCE CK

1.9S & 5E PARKER, Turner, SD

Built 1950 Load: 18.3 t ADT: 25

47580 302ND ST

Poor

Over: EAST BRULE CK

3.2W & 1S ALCESTER, Union, SD

Built 1960 Load: 18.3 t ADT: 270

43230 NW Jim River

Poor

Over: Trib. to James River

6.7N & 2.3E Lesterville, Yankton, SD

Built 1975 Load: 18.3 t ADT: 50

30730 436th Avenue

Poor

Over: Marne Creek

3.3S & 1E of Utica, Yankton, SD

Built 1935 Load: 18.3 t ADT: 33

29250 442nd Avenue

Poor

Over: Clay Creek

4.5N & 10W of Irene, Yankton, SD

Built 1930 Load: 18.3 t ADT: 50

392nd Avenue

Poor

Over: Cain Creek

2.5E & 1.6S of Virgil, Beadle, SD

Built 1930 Load: 18.4 t ADT: 105

27180 369th Avenue

Poor

Over: Platte Creek

4.2N & 2.0E of Platte, Charles Mix, SD

Built 1940 Load: 18.4 t ADT: 48

OLD HWY 85

Poor

Over: SHEEP CK

3.0E & 3.2N BUFFALO, Harding, SD

Built 1936 Load: 18.4 t ADT: 60

477th Avenue

Poor

Over: Beaver Creek

3W & 2.7N of Canton, Lincoln, SD

Built 1935 Load: 18.4 t ADT: 65

280th Street

Poor

Over: Beaver Creek

2N & 1.2W of Canton, Lincoln, SD

Built 1935 Load: 18.4 t ADT: 74

44330 268 ST

Poor

Over: WEST FORK VERMILLION RV

1N & 2.3E DOLTON, Turner, SD

Built 1988 Load: 18.4 t ADT: 50

Stone House Road

Poor

Over: Dry Choteau Creek

2W & 0.9S of Avon, Bon Homme, SD

Built 1924 Load: 18.5 t ADT: 60

416TH AVE.

Poor

Over: CK

1.5E & 3.9S ARTESIAN, Sanborn, SD

Built 1920 Load: 18.5 t ADT: 56

396th Avenue

Poor

Over: James River

4.0N of Columbia, Brown, SD

Built 1957 Load: 18.7 t ADT: 252

47570 311 STR.

Poor

Over: CK

13S & 3.7E BERESFORD, Union, SD

Built 1955 Load: 18.8 t ADT: 30

41470 300th Street

Poor

Over: Emanuel Creek

3N & 1.1W of Tyndall, Bon Homme, SD

Built 1970 Load: 18.9 t ADT: 60

COUNTRY ROAD

Poor

Over: BOX ELDER CK

1.7N 0.6E ELK VALE EXIT, Pennington, SD

Built 1950 Load: 18.9 t ADT: 1,214

31340 405th Avenue

Poor

Over: Coffee Creek

10W & 0.4S Springfield, Bon Homme, SD

Built 1977 Load: 19.1 t ADT: 60

41280 294th Street

Poor

Over: Emanuel Creek

9N & 3.3W of Tyndall, Bon Homme, SD

Built 1972 Load: 19.1 t ADT: 60

30370 427th Avenue

Poor

Over: Beaver Creek

2.3N of Tabor, Bon Homme, SD

Built 1955 Load: 19.1 t ADT: 60

37590 286th Street

Poor

Over: Pease Creek

1.0S & 1.9E of Geddes, Charles Mix, SD

Built 1974 Load: 19.1 t ADT: 48

30480 391st Street

Poor

Over: Mosquito Creek

7.8S & 4.0W of Wagner, Charles Mix, SD

Built 1974 Load: 19.1 t ADT: 48

Showing 5,301-5,350 of 5,905 bridges

Related

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

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). A "structurally deficient" rating is a repair-priority signal, not a closure or unsafe-to-cross designation. Consult a qualified civil engineer before making decisions based on this data.

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.