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

272 ST

Good

Over: DOG EAR CK

9.7E & 1.0N WITTEN, Tripp, SD

Built 2005 Load: 55.2 t ADT: 15

327 AVENUE

Good

Over: CK

4E 7.3N COLOME, Tripp, SD

Built 2018 Load: 55.2 t ADT: 31

EDGEMONT RD

Good

Over: INDIAN CK

10.2W & 1.5S ARDMORE, Fall River, SD

Built 2003 Load: 55.3 t ADT: 20

SD071

Good

Over: DUCK CK

2.5 S JCT SD 471, Fall River, SD

Built 1992 Load: 55.3 t ADT: 208

IRR AR SD063

Good

Over: BRAVE BULL CK

0.6 S JCT I 90, Jackson, SD

Built 2006 Load: 55.4 t ADT: 95

US014A

Good

Over: DEADWOOD CK

2 N JCT US 85, Lawrence, SD

Built 2019 Load: 55.4 t ADT: 7,743

COUNTY RD

Good

Over: VERMILLION RV

1.9N CENTERVILLE, Turner, SD

Built 1995 Load: 55.4 t ADT: 160

S ROCHFORD

Good

Over: RAPID CK

0.6W,0.1S ROCHFORD, Pennington, SD

Built 2021 Load: 55.5 t ADT: 276

254TH ST, HWY 122

Good

Over: WILLOW CK

1.4S & 1.1E LYONS, Minnehaha, SD

Built 1998 Load: 55.6 t ADT: 819

SD1806

Good

Over: DRAW

0.5 N JCT US14/SD34, Stanley, SD

Built 2010 Load: 55.7 t ADT: 1,804

SD044

Good

Over: CK

2.4 E HUTCHINSON CO LINE, Turner, SD

Built 1961 Load: 55.7 t ADT: 1,726

US083

Good

Over: CK

2 S OF MOUND CITY, Campbell, SD

Built 2011 Load: 55.8 t ADT: 929

213TH STREET

Good

Over: CK

1S & 2.9W BROOKINGS, Brookings, SD

Built 2000 Load: 56.0 t ADT: 92

202ND STREET

Good

Over: NORTH DEER CK

1N & 3.8E BRUCE, Brookings, SD

Built 1996 Load: 56.0 t ADT: 92

470TH AVENUE

Good

Over: NORTH DEER CK

10.3N & 1.0W BROOKINGS, Brookings, SD

Built 2005 Load: 56.0 t ADT: 40

197TH STREET

Good

Over: NORTH DEER CK

15N & 1E BROOKINGS, Brookings, SD

Built 2003 Load: 56.0 t ADT: 35

SD087

Good

Over: GRACE COOLIDGE CK

3.6 N JCT US 16A, Custer, SD

Built 2005 Load: 56.2 t ADT: 730

476 AVENUE

Good

Over: SOUTH FORK WHETSTONE RV

2W MILBANK, Grant, SD

Built 1999 Load: 56.2 t ADT: 25

202 NW 7TH STREET

Good

Over: PARK CK

7TH ST NW - MADISON, Lake, SD

Built 2003 Load: 56.2 t ADT: 290

SD019

Good

Over: CK

2.8 N JCT SD 44 WEST, Turner, SD

Built 1999 Load: 56.2 t ADT: 1,660

SD036

Good

Over: GRACE COOLIDGE CK

1.8 W JCT SD 79, Custer, SD

Built 1992 Load: 56.3 t ADT: 730

ALDER PL.

Good

Over: CK

1 W STURGIS, Meade, SD

Built 1963 Load: 56.3 t ADT: 33

47700 301 ST

Good

Over: CK

1W ALCESTER, Union, SD

Built 2004 Load: 56.3 t ADT: 120

GREEN VALLEY RD

Good

Over: CK

5.5S & 1.5W REE HEIGHTS, Hand, SD

Built 2008 Load: 56.6 t ADT: 43

SD115

Good

Over: BEAVER CK

1.1 N JCT SD 44, Lincoln, SD

Built 1987 Load: 56.7 t ADT: 1,900

US012

Good

Over: WHETSTONE RV

0.6 SW JCT SD 109, Grant, SD

Built 2003 Load: 57.1 t ADT: 3,317

SD087

Good

Over: GRACE COOLIDGE CK

4.9 N JCT US 16A, Custer, SD

Built 2005 Load: 57.2 t ADT: 730

TWNSHP RD 186TH ST

Good

Over: Hidewood Creek

2.2 W & 2 N BRANDT, Deuel, SD

Built 2022 Load: 57.2 t ADT: 35

459 AVE

Good

Over: BATTLE CK

6.6 MILES SOUTH OF NUNDA, Lake, SD

Built 2001 Load: 57.2 t ADT: 65

296 STREET

Good

Over: RAHN LK

2.5N & 6.9E MILLBORO, Tripp, SD

Built 2021 Load: 57.2 t ADT: 93

30800 438th Ave

Good

Over: Marne Creek

4.0S and 3.0 E of Utica, Yankton, SD

Built 2009 Load: 57.2 t ADT: 33

SD037 N

Good

Over: JAMES RV

4.6 S JCT SD 34, Sanborn, SD

Built 1992 Load: 57.3 t ADT: 1,305

IRR SD063

Good

Over: CK

0.9 N OF MCLAUGHLIN, Corson, SD

Built 1980 Load: 57.5 t ADT: 875

GREEN VALLEY RD

Good

Over: CK

9.4S & 2.2W REE HEIGHTS, Hand, SD

Built 2021 Load: 57.5 t ADT: 43

HOMESTAKE ROAD

Good

Over: HIGGINS GULCH

.9N 2.7W SPEARFISH, Lawrence, SD

Built 2000 Load: 57.5 t ADT: 69

415th Avenue

Good

Over: Tributary Foster Creek

8.6 N Carpenter, Clark, SD

Built 2012 Load: 57.6 t ADT: 140

US018

Good

Over: BEAVER CK

0.7 W OF CANTON, Lincoln, SD

Built 1980 Load: 57.7 t ADT: 2,742

451st Avenue

Good

Over: Creek

5.5S & 4W of Claire City, Roberts, SD

Built 2021 Load: 57.7 t ADT: 30

295th Street

Good

Over: Blind Creek

2N & 6.7W of Beresford, Lincoln, SD

Built 2016 Load: 58.0 t ADT: 63

456 AVENUE

Good

Over: MAHONEY CK

2.2S 8W SOUTH SHORE, Codington, SD

Built 1991 Load: 58.1 t ADT: 73

187TH STREET

Good

Over: CK

10.7 W & 7 N TORONTO, Deuel, SD

Built 2002 Load: 58.1 t ADT: 15

188 ST

Good

Over: CK

7.4W BRANDT, Deuel, SD

Built 2004 Load: 58.1 t ADT: 325

224 ST

Good

Over: BATTLE CK

5.6E & 1S NUNDA, Lake, SD

Built 2003 Load: 58.1 t ADT: 50

US016A

Good

Over: GRIZZLY BEAR CK

0.7 S JCT SD 244, Pennington, SD

Built 1974 Load: 58.1 t ADT: 582

I090 E

Good

Over: BURLINGTON NORTHERN RR

0.9 E I 29 INTERCH, Minnehaha, SD

Built 1993 Load: 58.3 t ADT: 13,405

251ST ST

Good

Over: WEST PIPESTONE CK

3.6W & 1S SHERMAN, Minnehaha, SD

Built 2014 Load: 58.4 t ADT: 16

US183

Good

Over: MILL IRON CK

1.0 E & 6.5 S PRESHO, Lyman, SD

Built 2005 Load: 58.6 t ADT: 756

206TH STREET

Good

Over: NORTH DEER CK

6N & 3.1W BROOKINGS, Brookings, SD

Built 1996 Load: 58.7 t ADT: 35

203RD STREET

Good

Over: NORTH DEER CK

9N & 1.9W BROOKINGS, Brookings, SD

Built 2004 Load: 58.7 t ADT: 30

I090 E

Good

Over: FALSE BOTTOM CK

1 E US 14A INTERCH, Lawrence, SD

Built 1970 Load: 58.7 t ADT: 8,525

Showing 4,601-4,650 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.