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

IRR I029 S

Good

Over: AGENCY CK

1.8 N PEEVER INTERCH, Roberts, SD

Built 1981 Load: 39.6 t ADT: 2,475

415TH AVE.

Good

Over: CK

0.5E 3.4N ARTESIAN, Sanborn, SD

Built 2020 Load: 39.6 t ADT: 56

152ND ST

Good

Over: SNAKE CREEK

2N & 4.2W NORTHVILLE, Spink, SD

Built 1995 Load: 39.6 t ADT: 55

447TH AVE

Good

Over: CK

9W & 0.3N VIBORG, Turner, SD

Built 2009 Load: 39.6 t ADT: 50

294th Street

Good

Over: Tributary to Blind Creek

3N & 4.9W of Beresford, Lincoln, SD

Built 2012 Load: 39.7 t ADT: 385

SD046

Good

Over: ASH CK

2.0 W I 29 INTERCH, Lincoln, SD

Built 2020 Load: 39.7 t ADT: 3,303

254TH ST, HWY 122

Good

Over: SILVER CK

4S & 0.6E BALTIC, Minnehaha, SD

Built 2020 Load: 39.7 t ADT: 922

SD037

Good

Over: JAMES RV

4.9 S SPINK CO LINE, Beadle, SD

Built 2020 Load: 39.8 t ADT: 1,683

193RD ST

Good

Over: Shue Creek

15N 6.2W Iroquois, Beadle, SD

Built 2019 Load: 39.8 t ADT: 56

SD046

Good

Over: BEAVER CK

4.9 W JCT SD 25, Bon Homme, SD

Built 1966 Load: 39.8 t ADT: 753

215TH STREET

Good

Over: CK

3.0S & 2.5W OF BROOKINGS, Brookings, SD

Built 2000 Load: 39.8 t ADT: 92

Nowlin Road

Good

Over: HAY DRAW CK

17.9 E PHILIP, Haakon, SD

Built 2002 Load: 39.8 t ADT: 25

US083

Good

Over: TRIB LITTLE CHEYENNE CK

10.3 S WALWORTH CO LINE, Potter, SD

Built 2003 Load: 39.8 t ADT: 939

SD044

Good

Over: THUNDER CK

4 E JCT US 18, Tripp, SD

Built 1969 Load: 39.8 t ADT: 1,236

46340 304 ST.

Good

Over: VERMILLION RV

2.0S & 8.3E WAKONDA, Clay, SD

Built 1996 Load: 39.9 t ADT: 35

SD471

Good

Over: COTTONWOOD CK

1.3 S OF EDGEMONT, Fall River, SD

Built 2015 Load: 40.0 t ADT: 209

I090 W

Good

Over: ELK CK

1.8 NW N PIEDMONT INTERCH, Meade, SD

Built 2017 Load: 40.0 t ADT: 11,460

379th Avenue

Good

Over: Cain Creek

5E & 0.4N of Wessington, Beadle, SD

Built 2018 Load: 40.1 t ADT: 35

SD1804

Good

Over: SPRING CK

2.1 S JCT SD 50, Charles Mix, SD

Built 1974 Load: 40.1 t ADT: 150

245TH ST / 15TH ST

Good

Over: TRIB TO BIG SIOUX RV

1.1E & 0.7N DELL RAPIDS, Minnehaha, SD

Built 2014 Load: 40.1 t ADT: 33

SD047

Good

Over: SWAN LAKE CK

3.9 N JCT SD 20, Walworth, SD

Built 2023 Load: 40.1 t ADT: 380

30130 448 Ave

Good

Over: Clay Creek

3.0W & 4.5N of Volin, Yankton, SD

Built 1996 Load: 40.1 t ADT: 198

27760 418 AVE.

Good

Over: NORTH BR DRY CK

8E 2.6S PARKSTON, Hutchinson, SD

Built 2020 Load: 40.2 t ADT: 205

185th Street

Good

Over: TRIB SHUE CK

4.5N & 0.1E of Carpenter, Clark, SD

Built 2018 Load: 40.3 t ADT: 50

356 AVE

Good

Over: MATTER CK

2 E & 2.8 N POLO, Hand, SD

Built 2015 Load: 40.3 t ADT: 43

218th Street

Good

Over: S. Fork of Pearl Creek

10S & 2.1E of Cavour, Beadle, SD

Built 2023 Load: 40.4 t ADT: 56

SD015

Good

Over: NORTH FORK YELLOW BANK R

3.6 S JCT US 12, Grant, SD

Built 2023 Load: 40.4 t ADT: 1,643

46010 302 ST.

Good

Over: VERMILLION RV

5.1 E WAKONDA, Clay, SD

Built 1998 Load: 40.5 t ADT: 234

111 GARFIELD AVE S

Good

Over: PARK CK

GARFIELD AVE - MADISON, Lake, SD

Built 2020 Load: 40.5 t ADT: 100

FDR 140

Good

Over: BOXELDER CREEK

T 3 N R 5 E SEC 29, Lawrence, SD

Built 2009 Load: 40.5 t ADT: 50

129th Street

Good

Over: Creek

2S & 0.5E of Peever, Roberts, SD

Built 2022 Load: 40.5 t ADT: 35

US018

Good

Over: TRIB TURKEY RIDGE CK

1.4 E TURKEY RIDGE, Turner, SD

Built 2019 Load: 40.5 t ADT: 875

212TH STREET

Good

Over: BIG SIOUX RV

3W BROOKINGS, Brookings, SD

Built 1991 Load: 40.6 t ADT: 92

212TH STREET

Good

Over: CK

1.0S & 3.2E OF VOLGA, Brookings, SD

Built 2001 Load: 40.6 t ADT: 50

I090 EF

Good

Over: DRAINAGE

2 SE S PIEDMONT INTERCH, Meade, SD

Built 2008 Load: 40.6 t ADT: 50

60TH ST N

Good

Over: SLIP UP CREEK

0.2W of VETERANS PRKWY, Minnehaha, SD

Built 2019 Load: 40.6 t ADT: 2,800

365TH AVE

Good

Over: LITTLE TURTLE CK

5.3N & 5E MILLER, Hand, SD

Built 2014 Load: 40.7 t ADT: 43

472nd Avenue

Good

Over: Nine Mile Creek

0.2S & 3W of Harrisburg, Lincoln, SD

Built 2018 Load: 40.7 t ADT: 100

I090 E

Good

Over: ELK CK

1.8 NW N PIEDMONT INTERCH, Meade, SD

Built 2018 Load: 40.7 t ADT: 11,460

US014

Good

Over: WILLOW CK

7.9 W JCT US 83, Stanley, SD

Built 1984 Load: 40.7 t ADT: 1,519

30140 437th Avenue

Good

Over: Beaver Creek

2E & 2.6N of Utica, Yankton, SD

Built 2006 Load: 40.7 t ADT: 21

159 STREET

Good

Over: BIG SIOUX RV

11.4W 2S SOUTH SHORE, Codington, SD

Built 2020 Load: 40.8 t ADT: 73

US016A

Good

Over: FRENCH CK

2.6 E JCT SD 89 N, Custer, SD

Built 1964 Load: 40.8 t ADT: 1,691

FDR 345

Good

Over: IRON CREEK

T 2 S R 6 E SEC 32, Custer, SD

Built 1958 Load: 40.8 t ADT: 25

TWNSHP RD 486TH AV

Good

Over: Cobb Creek

3.3 S & 1 W GARY, Deuel, SD

Built 2023 Load: 40.8 t ADT: 134

IRR US212

Good

Over: VIRGIN CK

0.6 W OF LAPLANT, Dewey, SD

Built 1990 Load: 40.8 t ADT: 671

456 AVE

Good

Over: Creek

1E & 1.3S MADISON, Lake, SD

Built 2023 Load: 40.8 t ADT: 173

461 AVE

Good

Over: NORTH BUFFALO CK

6.2S & 6.0E MADISON, Lake, SD

Built 2021 Load: 40.8 t ADT: 681

310th Avenue

Good

Over: Swan Creek

0.3N of Lowry, Walworth, SD

Built 1991 Load: 40.8 t ADT: 41

106th Street

Good

Over: Spring Creek

1.5 N & 6.1 E of Herreid, Campbell, SD

Built 2015 Load: 40.9 t ADT: 110

Showing 4,201-4,250 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.