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

182ND ST

Fair

Over: James River

9 S 0.1 E FRANKFORT, Spink, SD

Built 1975 Load: 37.5 t ADT: 40

US018

Fair

Over: BIG HOLLOW CK

3.9 E JCT US 183, Tripp, SD

Built 1965 Load: 37.5 t ADT: 1,613

US014

Fair

Over: MIDDLE PEARL CK

2.7 W OF IROQUOIS, Beadle, SD

Built 1965 Load: 37.6 t ADT: 1,883

Morristown Road

Fair

Over: Grand River

18S & 1E MORRISTOWN, Corson, SD

Built 1981 Load: 37.6 t ADT: 30

SD071

Fair

Over: ALABAUGH CANYON

8.1 S OF HOT SPRINGS, Fall River, SD

Built 1998 Load: 37.6 t ADT: 383

WHITEWOOD RD

Fair

Over: BEAR BUTTE CK

WEST EDGE OF STURGIS, Meade, SD

Built 2006 Load: 37.6 t ADT: 875

463rd Avenue

Fair

Over: Little Minnesota River

5E & 0.5S of Sisseton, Roberts, SD

Built 1986 Load: 37.6 t ADT: 47

I090 E

Fair

Over: PLATTE CK

3.2 W WHITE LAKE INTERCH, Aurora, SD

Built 1964 Load: 37.7 t ADT: 4,390

SD046

Fair

Over: EMANUEL CK

3.1 E JCT SD 37, Bon Homme, SD

Built 1966 Load: 37.7 t ADT: 522

WALNUT STREET

Fair

Over: WHITEWOOD CK

CHARLES ST - DEADWOOD, Lawrence, SD

Built 1994 Load: 37.7 t ADT: 30

SD042

Fair

Over: WOLF CK

2.9 W JCT SD 262, McCook, SD

Built 1957 Load: 37.7 t ADT: 356

IRR BIA RTE 41

Fair

Over: WHITE RIVER

19.3 KM NW OF OGLALA, Oglala Lakota, SD

Built 1976 Load: 37.7 t ADT: 624

CAMBELL ST

Fair

Over: RAPID CK

0.6 S JCT SD 44, Pennington, SD

Built 1967 Load: 37.7 t ADT: 21,415

SD026

Fair

Over: TURTLE CK

4.3 W JCT US 281, Spink, SD

Built 1984 Load: 37.7 t ADT: 578

I090 W

Fair

Over: PLATTE CK

3.2 W WHITE LAKE INTERCH, Aurora, SD

Built 1964 Load: 37.8 t ADT: 4,390

395th Avenue

Fair

Over: Elm River

2S & 1.1W of Columbia, Brown, SD

Built 1987 Load: 37.8 t ADT: 98

US085

Fair

Over: JONES CK

8.9 NE OF BUFFALO, Harding, SD

Built 1960 Load: 37.8 t ADT: 1,312

US085

Fair

Over: BIG NASTY CK

9.7 S NORTH DAKOTA LINE, Harding, SD

Built 1960 Load: 37.8 t ADT: 1,100

SD011

Fair

Over: NINE MILE CK

6 S MINNEHAHA CO LINE, Lincoln, SD

Built 1963 Load: 37.8 t ADT: 2,938

IRR US018

Fair

Over: WHITE CLAY CK

11.2 NW OF PINE RIDGE, Oglala Lakota, SD

Built 2011 Load: 37.8 t ADT: 2,241

SD050

Fair

Over: VERMILLION RV

1 NW OF VERMILLION, Clay, SD

Built 1981 Load: 37.9 t ADT: 4,888

SD020

Fair

Over: CK

2.6 W JCT SD 15, Grant, SD

Built 1956 Load: 37.9 t ADT: 739

US016

Fair

Over: SPRING CK

0.2 E JCT US 385, Pennington, SD

Built 1985 Load: 37.9 t ADT: 6,612

116th Street

Fair

Over: Little Minnesota River

1E & 3N of Sisseton, Roberts, SD

Built 1988 Load: 37.9 t ADT: 68

IRR SD010

Fair

Over: LITTLE MINNESOTA RV

1.7 E JCT I 29, Roberts, SD

Built 2006 Load: 37.9 t ADT: 1,588

470th Avenue

Fair

Over: N Fork Whetstone River

3N & 2W of Corona, Roberts, SD

Built 1988 Load: 37.9 t ADT: 55

SD011

Fair

Over: WEST UNION CK

12.4 S JCT SD 46, Union, SD

Built 1969 Load: 37.9 t ADT: 359

US014

Fair

Over: DEER CK

1.9 E I 29 INTERCH, Brookings, SD

Built 1973 Load: 38.0 t ADT: 4,885

US014

Fair

Over: PEARL CK

5.8 E JCT SD 45, Hand, SD

Built 1996 Load: 38.0 t ADT: 1,373

SD050

Fair

Over: PEASE CK

4.3 S OF GEDDES, Charles Mix, SD

Built 1954 Load: 38.1 t ADT: 550

145 STREET

Fair

Over: NORTH FORK WHETSTONE RV

0.5S & 6.5W BIG STONE, Grant, SD

Built 1966 Load: 38.1 t ADT: 370

455 AVE

Fair

Over: NORTH BR BUFFALO CK

2.0W & 0.5S FRANKLIN, Lake, SD

Built 1977 Load: 38.1 t ADT: 60

I090 E

Fair

Over: CK

2.6 E SD 38 INTERCH, Minnehaha, SD

Built 1961 Load: 38.1 t ADT: 8,550

Falls Park Drive

Fair

Over: Big Sioux River

west of Weber Avenue, Minnehaha, SD

Built 1995 Load: 38.1 t ADT: 8,260

SD044

Fair

Over: RAPID CK

4.2 SW JCT SD 231, Pennington, SD

Built 1967 Load: 38.1 t ADT: 3,690

US016

Fair

Over: SPRING CK

200' EAST NEWTON ST, Pennington, SD

Built 1995 Load: 38.2 t ADT: 6,642

SD025

Fair

Over: ROCK CK

7.5 S JCT SD 34, Miner, SD

Built 1976 Load: 38.3 t ADT: 484

I090 W

Fair

Over: POLO CK

1 E US 85 S INTERCH, Lawrence, SD

Built 1971 Load: 38.4 t ADT: 7,465

Russell Street EBL

Fair

Over: Big Sioux River

west of Kiwanis Avenue, Minnehaha, SD

Built 2013 Load: 38.4 t ADT: 19,500

Otumwa Road

Fair

Over: NOWLIN CK

7 S OTTUMWA, Haakon, SD

Built 1965 Load: 38.5 t ADT: 42

I090 WF

Fair

Over: SPEARFISH CK

0.4 W US 85 INTERCH, Lawrence, SD

Built 1974 Load: 38.5 t ADT: 50

I090 E

Fair

Over: POLO CK

1 E US 85 S INTERCH, Lawrence, SD

Built 1971 Load: 38.5 t ADT: 7,465

44910 273 ST.

Fair

Over: WEST FORK VERMILLION RV

2.1E MARION, Turner, SD

Built 1990 Load: 38.6 t ADT: 97

SD019A

Fair

Over: CK

2.7 E JCT SD 19, Turner, SD

Built 1968 Load: 38.6 t ADT: 320

SD019A

Fair

Over: TURKEY RIDGE CK

4.6 E JCT SD 19, Turner, SD

Built 1968 Load: 38.6 t ADT: 320

I029 S

Fair

Over: PEG MUNKY RUN CK

0.9 N SD 28 INTERCH, Deuel, SD

Built 1973 Load: 38.7 t ADT: 4,290

I090 W

Fair

Over: WOLF CK

0.9 W MCCOOK CO LINE, Hanson, SD

Built 1964 Load: 38.7 t ADT: 6,255

I090 E

Fair

Over: WOLF CK

0.9 W MCCOOK CO LINE, Hanson, SD

Built 1964 Load: 38.7 t ADT: 6,255

SD044

Fair

Over: NORTH BR DRY CK

5.6 E JCT SD 37, Hutchinson, SD

Built 1964 Load: 38.7 t ADT: 1,592

SD044

Fair

Over: NORTH BR DRY CK

6.5 E JCT SD 37, Hutchinson, SD

Built 1964 Load: 38.7 t ADT: 1,592

Showing 2,501-2,550 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.