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

I029 S

Fair

Over: BACHELOR CK

3.8 S SD 34 INTERCH, Moody, SD

Built 1964 Load: 34.5 t ADT: 9,835

WHITE BUTTE ROAD

Fair

Over: SOUTH FORK GRAND RV

0.4E 5.5 N BISON, Perkins, SD

Built 2012 Load: 34.5 t ADT: 155

OLSON CUTOFF ROAD

Fair

Over: BELLE FOURCHE RV

1N & 4E BELLE FOURCH, Butte, SD

Built 1995 Load: 34.6 t ADT: 47

US018

Fair

Over: SOUTH FORK BLACKTAIL CK

6 E JCT US 385 S, Fall River, SD

Built 1952 Load: 34.6 t ADT: 676

SD044

Fair

Over: DIXON CK

1.9 W JCT SD 47, Gregory, SD

Built 1971 Load: 34.6 t ADT: 568

SD079

Fair

Over: COTTONWOOD CK

3.3 S BUTTE CO LINE, Meade, SD

Built 1954 Load: 34.6 t ADT: 2,199

SD044

Fair

Over: SAND CK

1.6 E JCT US 18, Tripp, SD

Built 1969 Load: 34.6 t ADT: 1,236

27210 447 AVE

Fair

Over: WEST FORK VERMILLION RV

0.9 N MARION, Turner, SD

Built 2017 Load: 34.6 t ADT: 653

AVANCE RD.

Fair

Over: CK

6S & 9.9W FAITH, Meade, SD

Built 1962 Load: 34.7 t ADT: 40

SHEILDS RD

Fair

Over: RAPID CK

0.5E 1.3S JOHNSON SD, Pennington, SD

Built 1972 Load: 34.7 t ADT: 38

SD037

Fair

Over: TIMBER CK

1.1 S BROWN CO LINE, Spink, SD

Built 1955 Load: 34.7 t ADT: 960

I029

Fair

Over: CK

3.3 S US 14 INTERCH, Brookings, SD

Built 1966 Load: 34.8 t ADT: 12,240

117th Street

Fair

Over: Sand Lake

5.5N & 0.3E of Columbia, Brown, SD

Built 1971 Load: 34.8 t ADT: 41

SD079N

Fair

Over: BEAVER CK

2.7 N FALL RIVER CO LINE, Custer, SD

Built 1957 Load: 34.8 t ADT: 2,203

US014

Fair

Over: WILBURN CK

6.4 E OF PHILIP, Haakon, SD

Built 1955 Load: 34.8 t ADT: 725

CANYON LAKE DR

Fair

Over: RAPID CK

.2W CANYON LK&MT VIEW -RC, Pennington, SD

Built 2003 Load: 34.8 t ADT: 8,885

SD028

Fair

Over: JAMES RV

2.6 W JCT SD 37, Spink, SD

Built 2013 Load: 34.8 t ADT: 363

390 AVE

Fair

Over: FIRESTEEL CK

3W 1.2N STORLA, Aurora, SD

Built 1999 Load: 34.9 t ADT: 33

US085

Fair

Over: SHEEP CK

3.6 N OF BUFFALO, Harding, SD

Built 1963 Load: 34.9 t ADT: 1,312

SD027

Fair

Over: SPAIN DITCH

6.3 S JCT SD 10, Marshall, SD

Built 1977 Load: 34.9 t ADT: 727

SD079

Fair

Over: SOUTH WILLOW CK

10 N NEWELL & JCT 212 E, Butte, SD

Built 1962 Load: 35.0 t ADT: 786

SD079

Fair

Over: DRY CK

3.7 N NEWELL & JCT 212 E, Butte, SD

Built 1962 Load: 35.0 t ADT: 786

42840 282 STR.

Fair

Over: JAMES RV

4N 2.4E OLIVET, Hutchinson, SD

Built 1966 Load: 35.0 t ADT: 106

US212

Fair

Over: JAMES RV

1.7 W OF FRANKFORT, Spink, SD

Built 1968 Load: 35.0 t ADT: 1,651

Shore Drive

Fair

Over: GAVINS POINT SPILLWAY

5 Miles West of Yankton, Yankton, SD

Built 1956 Load: 35.0 t ADT: 1,029

111th Street

Fair

Over: Elm River

3.7S & 1.5W of Frederick, Brown, SD

Built 1988 Load: 35.1 t ADT: 98

30280 458 AVE

Fair

Over: NORWEGIAN GULCH

5.8S & 6.0E IRENE, Clay, SD

Built 2006 Load: 35.1 t ADT: 31

SD040

Fair

Over: BATTLE CK

0.1 E OF HAYWARD, Pennington, SD

Built 1974 Load: 35.1 t ADT: 995

I090 W

Fair

Over: RCP&E RR

0.5 W SD 240 INTERCH, Pennington, SD

Built 1968 Load: 35.1 t ADT: 3,895

I090 E

Fair

Over: RCP&E RR

0.5 W SD 240 INTERCH, Pennington, SD

Built 1968 Load: 35.1 t ADT: 3,895

180th Street

Fair

Over: Stray Horse Creek

3.8E & 3N of Castlewood, Hamlin, SD

Built 1990 Load: 35.2 t ADT: 118

IRR US083

Fair

Over: ANTELOPE CK

0.1 S JCT US 18, Todd, SD

Built 1981 Load: 35.2 t ADT: 2,517

IRR SD050

Fair

Over: WOLF CK

6.1 S JCT SD 34, Buffalo, SD

Built 1954 Load: 35.3 t ADT: 954

SD034

Fair

Over: WEST PLUM CK

7.1 E JCT SD 73 S, Haakon, SD

Built 1958 Load: 35.3 t ADT: 438

SD028

Fair

Over: LAKE POINSETT INLET

3.3 E JCT US 81, Hamlin, SD

Built 1951 Load: 35.3 t ADT: 998

41270 271 ST.

Fair

Over: COFFEE CK

1 S 1.7 E DIMOCK SD, Hutchinson, SD

Built 2009 Load: 35.3 t ADT: 45

I090 E

Fair

Over: WHITE WILLOW CK

1.3 W KADOKA INTERCH, Jackson, SD

Built 1967 Load: 35.3 t ADT: 3,360

10th Street

Fair

Over: Big Sioux River

west of Reid Street, Minnehaha, SD

Built 1934 Load: 35.3 t ADT: 25,000

US016 EF

Fair

Over: SPRING CK

0.5 E JCT US 385, Pennington, SD

Built 1985 Load: 35.3 t ADT: 60

STATE HIGHWAY 514

Fair

Over: OAHE DAM DISCHARGE CHAN.

5 Miles No. of Ft. Pierre, Stanley, SD

Built 1957 Load: 35.3 t ADT: 300

SD048

Fair

Over: BRULE CK

3.5 E I 29 INTERCH, Union, SD

Built 1957 Load: 35.3 t ADT: 742

164 STREET

Fair

Over: BIG SIOUX RV

8N 3.2 W WATERTOWN, Codington, SD

Built 1966 Load: 35.4 t ADT: 397

I090 W

Fair

Over: WHITE WILLOW CK

1.3 W KADOKA INTERCH, Jackson, SD

Built 1967 Load: 35.4 t ADT: 3,360

I090 E

Fair

Over: R&W RR

2.6 E OKATON INTERCH, Jones, SD

Built 1969 Load: 35.4 t ADT: 3,360

SD040

Fair

Over: BATTLE CK

0.3 E OF HAYWARD, Pennington, SD

Built 1974 Load: 35.4 t ADT: 995

SD044

Fair

Over: PLATTE CK

2.4 W JCT SD 45 N, Charles Mix, SD

Built 1964 Load: 35.5 t ADT: 2,262

42818 MAXWELL RD.

Fair

Over: JAMES RV

3.8S 2.1E OLIVET, Hutchinson, SD

Built 1971 Load: 35.5 t ADT: 148

SD040

Fair

Over: IRON CK

5.3 E JCT US 16A, Pennington, SD

Built 1974 Load: 35.5 t ADT: 995

3rd Street

Fair

Over: Turtle Creek

3rd Street West Redfield, Spink, SD

Built 1993 Load: 35.5 t ADT: 191

396TH AVE

Fair

Over: CREEK

7.1S FRANKFORT, Spink, SD

Built 1972 Load: 35.5 t ADT: 40

Showing 2,351-2,400 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.