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

30520 475TH AVE

Good

Over: CK

4W & 4.2S ALCESTER, Union, SD

Built 2009 Load: 34.0 t ADT: 150

I090 W

Good

Over: R&W RR

0.6 W OACOMA INTERCH, Lyman, SD

Built 1971 Load: 34.1 t ADT: 3,650

I090 E

Good

Over: R&W RR

0.6 W OACOMA INTERCH, Lyman, SD

Built 1971 Load: 34.1 t ADT: 3,650

487th Avenue

Good

Over: Trib. to Pipestone Creek

9E & 2.8S of Trent, Moody, SD

Built 2020 Load: 34.1 t ADT: 69

IRR AR SD040

Good

Over: BATTLE CK

17.5 SE OF HERMOSA, Custer, SD

Built 2017 Load: 34.2 t ADT: 665

393rd Avenue

Good

Over: Elm River

3.6S & 3W of Columbia, Brown, SD

Built 1996 Load: 34.3 t ADT: 158

45206 BLUFF RD

Good

Over: CK

4.5S & 2.4W WAKONDA, Clay, SD

Built 2019 Load: 34.3 t ADT: 97

30940 BLUFF ROAD

Good

Over: CK

4.6N & 0.2W MECKLING, Clay, SD

Built 2019 Load: 34.3 t ADT: 121

DORSETTE ROAD

Good

Over: REDWATER RV

4.5N 2W SPEARFISH, Lawrence, SD

Built 2020 Load: 34.3 t ADT: 69

BLOODY GULCH

Good

Over: RAPID CREEK

T 2 N R 3 E SEC 24, Meade, SD

Built 2005 Load: 34.3 t ADT: 25

216TH STREET

Good

Over: BIG SIOUX RV

4S & 2.3W BROOKINGS, Brookings, SD

Built 2022 Load: 34.4 t ADT: 454

US385

Good

Over: WHITEWOOD CK

0.5 S OF PLUMA, Lawrence, SD

Built 1985 Load: 34.4 t ADT: 2,566

177th Street

Good

Over: Foster Creek

6.0S & 0.3E Raymond, Clark, SD

Built 2023 Load: 34.5 t ADT: 39

COUNTY RD 21

Good

Over: BEAVER CK

1.1W & 0.3S BURDOCK, Fall River, SD

Built 2022 Load: 34.5 t ADT: 41

OLD HIGHWAY 79

Good

Over: HORSEHEAD CK

5.6W & 5.7N OELRICHS, Fall River, SD

Built 1992 Load: 34.5 t ADT: 58

482 AVENUE

Good

Over: CK

0.5S REVILLO, Grant, SD

Built 2018 Load: 34.5 t ADT: 159

189th Street

Good

Over: Big Sioux River

2W & 1N of Dempster, Hamlin, SD

Built 2008 Load: 34.5 t ADT: 45

184th Street

Good

Over: Stray Horse Creek

2.6E & 1S of Castlewood, Hamlin, SD

Built 1990 Load: 34.5 t ADT: 376

234th Street

Good

Over: Creek

7N & 10.9W of Presho, Lyman, SD

Built 2008 Load: 34.5 t ADT: 10

I090 EF

Good

Over: TRIB. TO ELK CK

1.2 NW N Piedmont Interch, Meade, SD

Built 2016 Load: 34.5 t ADT: 700

461ST AVE, HWY 155

Good

Over: WEST BR SKUNK CK

5.2N & 2W HARTFORD, Minnehaha, SD

Built 2020 Load: 34.5 t ADT: 200

NEMO ROAD

Good

Over: BOXELDER CK

9.5W 3.5N RAPID CITY, Pennington, SD

Built 1972 Load: 34.5 t ADT: 1,452

382nd Avenue

Good

Over: Richmond Lake Spillway

1N & 1.4E of Richmond, Brown, SD

Built 1999 Load: 34.6 t ADT: 283

JOLLY LANE

Good

Over: RAPID CK

0.3S SD44 ON JOLLYLN RC, Pennington, SD

Built 1998 Load: 34.7 t ADT: 350

US014

Good

Over: BR COTTONWOOD CK

3.8 W JACKSON CO LINE, Pennington, SD

Built 2021 Load: 34.7 t ADT: 1,036

SD044

Good

Over: WEST BR BULL CK

14.5 E OF WINNER, Tripp, SD

Built 1971 Load: 34.7 t ADT: 568

30250 484TH AVE

Good

Over: CK

5.4E & 1.5S ALCESTER, Union, SD

Built 2021 Load: 34.7 t ADT: 34

I090 EF

Good

Over: LITTLE ELK CK

0.6 NW N PIEDMONT INTERCH, Meade, SD

Built 2016 Load: 34.8 t ADT: 700

I090 E

Good

Over: LITTLE ELK CK

0.5 NW PIEDMONT INTERCH, Meade, SD

Built 2018 Load: 34.8 t ADT: 11,460

249TH STREET

Good

Over: SLIP-UP CREEK

4.5E & 1N BALTIC, Minnehaha, SD

Built 2020 Load: 34.8 t ADT: 17

233rd Street

Good

Over: Squaw Creek

6.8E & 1.5N of Colman, Moody, SD

Built 2020 Load: 34.8 t ADT: 30

8TH AVENUE

Good

Over: HAY CK

8TH AVENUE- BELLE FOURCHE, Butte, SD

Built 2019 Load: 34.9 t ADT: 300

US018

Good

Over: VERMILLION RV

3.5 E JCT SD 19, Turner, SD

Built 2013 Load: 34.9 t ADT: 2,058

47380 301ST ST

Good

Over: WEST BRULE CK

3S & 1.8E BERESFORD, Union, SD

Built 2010 Load: 34.9 t ADT: 50

SD025

Good

Over: SOUTH BR LONETREE CK

0.7 S JCT US 18, Hutchinson, SD

Built 2012 Load: 35.0 t ADT: 725

FDR 181

Good

Over: CASTLE CREEK

T 1 N R 3 E SEC 2, Pennington, SD

Built 1956 Load: 35.0 t ADT: 25

SD1806EF

Good

Over: DIVERSION CHANNEL

2.2 N FORT PIERRE, Stanley, SD

Built 1998 Load: 35.0 t ADT: 50

WALNUT STREET

Good

Over: PONY CK

WALNUT ST PARKSTON, Hutchinson, SD

Built 2011 Load: 35.1 t ADT: 45

30680 435th Avenue

Good

Over: Marne Creek

2.8S of Utica, Yankton, SD

Built 2020 Load: 35.1 t ADT: 366

IRR BIA ROUTE 8

Good

Over: EAST BRANCH WILLOW CREEK

RTE 8 OVER E BRCH WIL CRK, Dewey, SD

Built 2008 Load: 35.2 t ADT: 160

250TH ST, HWY 114

Good

Over: SILVER CREEK

0.5E BALTIC, Minnehaha, SD

Built 2019 Load: 35.2 t ADT: 2,628

29260 448 Ave

Good

Over: Turkey Creek

1.6 S Center Point, Yankton, SD

Built 2022 Load: 35.2 t ADT: 98

44890 294 St

Good

Over: Turkey Creek

3 N & 3.1 W Irene, Yankton, SD

Built 2022 Load: 35.2 t ADT: 95

383RD AVENUE

Good

Over: Foot Creek

4.1N & 4.2W ABERDEEN, Brown, SD

Built 1990 Load: 35.3 t ADT: 1,128

E FRENCH CK ROAD

Good

Over: FRENCH CK

2S 10.5E FAIRBURN, Custer, SD

Built 2020 Load: 35.3 t ADT: 15

418th Avenue

Good

Over: Tributary to Mud Creek

2.9S & 1.0W of Pierpont, Day, SD

Built 2006 Load: 35.3 t ADT: 15

133rd Street

Good

Over: Tributary to Mud Creek

2.5S & 0.8W of Pierpont, Day, SD

Built 2006 Load: 35.3 t ADT: 25

133rd Street

Good

Over: Tributary to Mud Creek

2.3S & 0.4W of Pierpont, Day, SD

Built 2006 Load: 35.3 t ADT: 25

270 ST

Good

Over: TWELVE MILE CK

7E of Dimock, Hutchinson, SD

Built 2020 Load: 35.3 t ADT: 257

ELK VALE RD.

Good

Over: DRY CK

11.9E 1.4S PIEDMONT, Meade, SD

Built 2017 Load: 35.3 t ADT: 153

Showing 3,951-4,000 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.