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

CEDAR CANYON RD

Good

Over: MOREAU RV

12.0W 26.3S BISON, Perkins, SD

Built 2005 Load: 28.8 t ADT: 14

SD073

Good

Over: EAST FLAT CK

7.3 S JCT US 12, Perkins, SD

Built 2018 Load: 28.8 t ADT: 705

SD015

Good

Over: CK

4 E I 29 INTERCH, Roberts, SD

Built 2021 Load: 28.8 t ADT: 666

314 AVENUE

Good

Over: KEYAPAHA RV

4E & 1S MILLBORO, Tripp, SD

Built 1980 Load: 28.8 t ADT: 39

HANSEN ROAD

Good

Over: NORTH CANAL

5.6W & 4N NEWELL, Butte, SD

Built 1994 Load: 28.9 t ADT: 160

192nd Street

Good

Over: Lake Poinsett Outlet

5.6E of Jct Hwy 28 & 81, Hamlin, SD

Built 1999 Load: 28.9 t ADT: 66

282nd Street

Good

Over: Long Creek

3S & 0.4W of Lennox, Lincoln, SD

Built 2015 Load: 28.9 t ADT: 168

475th Avenue

Good

Over: Trib to S Fork Beaver Ck

3E & 5.5S of Worthing, Lincoln, SD

Built 2018 Load: 28.9 t ADT: 60

142 STREET

Good

Over: CK

5.8E & 4.5N MARVIN, Grant, SD

Built 2007 Load: 29.0 t ADT: 35

318 AVENUE

Good

Over: CHAPELLE CK

3.3W & 11.5S HARROLD, Hughes, SD

Built 1994 Load: 29.0 t ADT: 51

223 ST

Good

Over: BATTLE CK

3S & 1.2W LAKE CAMPBELL, Lake, SD

Built 2012 Load: 29.0 t ADT: 350

ZEONIA ROAD

Good

Over: SOUTH FORK MOREAU RV

4.5W & 30.4S PRAIRIE CITY, Perkins, SD

Built 1996 Load: 29.3 t ADT: 41

39510 273 ST

Good

Over: CHOTEAU CK

6.1 E CORSICA, Douglas, SD

Built 2018 Load: 29.4 t ADT: 191

US212

Good

Over: TRIB S FORK SNAKE CK

5.8E & 0.5S Seneca, Faulk, SD

Built 2021 Load: 29.4 t ADT: 717

RODEO ENTRANCE

Good

Over: WHITEWOOD CK

RODEO ENTR. - DEADWOOD, Lawrence, SD

Built 1986 Load: 29.4 t ADT: 90

273rd Street

Good

Over: Nine Mile Creek

3.3E of Harrisburg, Lincoln, SD

Built 2023 Load: 29.4 t ADT: 1,032

47190 307 ST.

Good

Over: EAST BRULE CK

1.5S & 2E ALSEN, Union, SD

Built 2013 Load: 29.4 t ADT: 235

SD071

Good

Over: CK

0.5 S JCT SD 471, Fall River, SD

Built 2019 Load: 29.5 t ADT: 208

SD042

Good

Over: JAMES RV

7.5 E DAVISON CO LINE, Hanson, SD

Built 2022 Load: 29.5 t ADT: 356

HOMESTAKE ROAD

Good

Over: BEAVER CK

6.5 W 1 N SPEARFISH, Lawrence, SD

Built 1930 Load: 29.6 t ADT: 69

26870 411 AVE

Good

Over: SOUTH FORK TWELVE MILE C

0.8 N DIMOCK S.D., Hutchinson, SD

Built 1990 Load: 29.7 t ADT: 69

COYOTE LANE

Good

Over: SPEARFISH CK

1.5S Savoy, Lawrence, SD

Built 2021 Load: 29.7 t ADT: 10

243rd Ave.

Good

Over: MITCHELL CK

4 W & 6.2 N MIDLAND, Haakon, SD

Built 1965 Load: 29.8 t ADT: 28

PLANO RD

Good

Over: CK

10.5N & 8.2W ALEXANDRIA, Hanson, SD

Built 2012 Load: 29.8 t ADT: 215

411TH AVE.

Good

Over: REDSTONE CK

3.5W 4.4N ARTESIAN, Sanborn, SD

Built 1998 Load: 29.8 t ADT: 35

29980 NE Jim River

Good

Over: Mud Creek

2.8S & 10.3W of Irene, Yankton, SD

Built 2021 Load: 29.8 t ADT: 33

IRR SD073

Good

Over: BURLINGTON NORTHERN RR

0.1 S NORTH DAKOTA LINE, Corson, SD

Built 1977 Load: 29.9 t ADT: 295

WHITE BUTTE ROAD

Good

Over: FLAT CK

1 S WHITE BUTTE, Perkins, SD

Built 2002 Load: 29.9 t ADT: 163

467th Avenue

Good

Over: Tributary

0.8N of Wilmot, Roberts, SD

Built 2011 Load: 29.9 t ADT: 165

Main Ave in Vivian

Good

Over: Medicine Creek

0.3S of Vivian, Lyman, SD

Built 2004 Load: 30.0 t ADT: 130

438th Avenue

Good

Over: W. Fork of Vermillion Rv

0.5N of Unityville, McCook, SD

Built 2019 Load: 30.0 t ADT: 21

I090

Good

Over: PLEASANT VALLEY CK

2.7 NW TILFORD INTERCH, Meade, SD

Built 2023 Load: 30.0 t ADT: 18,420

107th Street

Good

Over: Oak Creek

1.0W & 2.0N MCLAUGHLIN, Corson, SD

Built 2005 Load: 30.1 t ADT: 25

US385

Good

Over: CK

2.0 S JCT US 18 E, Fall River, SD

Built 2013 Load: 30.1 t ADT: 673

25880 422 AVE.

Good

Over: PIERRE CK

1.0 S & 0.5 E ALEX, Hanson, SD

Built 2019 Load: 30.1 t ADT: 45

US081

Good

Over: CK

3.9 W JCT US 81 N, Lake, SD

Built 1997 Load: 30.2 t ADT: 1,744

I090 E

Good

Over: AMERICAN CROW CK

0.9 W OACOMA INTERCH, Lyman, SD

Built 1971 Load: 30.2 t ADT: 3,650

396th Avenue

Good

Over: Elm River

1S of Columbia, Brown, SD

Built 2014 Load: 30.3 t ADT: 100

243rd Street

Good

Over: American Crow Creek

0.6E of Reliance, Lyman, SD

Built 2004 Load: 30.3 t ADT: 50

N. Bahnson Avenue

Good

Over: Big Sioux River

north of E. Rice Street, Minnehaha, SD

Built 1989 Load: 30.3 t ADT: 1,750

SHANARD ROAD

Good

Over: FIRESTEEL CK

E OF N EDGE MITCHELL, Davison, SD

Built 2006 Load: 30.4 t ADT: 1,065

I090 EF

Good

Over: TRIB. TO MORRIS CK

Exit 40 I90 S Service Rd, Meade, SD

Built 2016 Load: 30.4 t ADT: 700

38560 303rd Street

Good

Over: Seven Mile Creek

2.4W & 0.6N of Marty, Charles Mix, SD

Built 2005 Load: 30.5 t ADT: 70

31530 UNIVERSITYRD

Good

Over: VERMILLION RV

0.3E & 2.2N VERMILLION, Clay, SD

Built 1968 Load: 30.6 t ADT: 550

Saddlerock Pl

Good

Over: Spring Creek

2.2N & 3.0E of Harrisburg, Lincoln, SD

Built 2014 Load: 30.6 t ADT: 80

I090 W

Good

Over: AMERICAN CROW CK

0.9 W OACOMA INTERCH, Lyman, SD

Built 1972 Load: 30.6 t ADT: 3,650

47180 311TH STREET

Good

Over: BRULE CK

13S & 0.8E BERESFORD, Union, SD

Built 2002 Load: 30.6 t ADT: 25

44950 292 ST

Good

Over: Drainage Ditch

5N & 2.5W of Irene, Yankton, SD

Built 2017 Load: 30.6 t ADT: 85

SD050

Good

Over: PEASE CK

4.1 S OF GEDDES, Charles Mix, SD

Built 1954 Load: 30.7 t ADT: 550

29760 467TH AVE.

Good

Over: ASH CK

0.6S & 15E IRENE, Clay, SD

Built 2022 Load: 30.7 t ADT: 25

Showing 3,651-3,700 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.