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

STATE PARK RD

Fair

Over: SAND CK

3.5S & 11.0E FORT PIERRE, Stanley, SD

Built 1964 Load: 21.8 t ADT: 10

STATE PARK RD

Fair

Over: BNSF RR

2.0E & 1.0S MOBRIDGE, Walworth, SD

Built 1964 Load: 21.8 t ADT: 50

391st Avenue

Fair

Over: Elm River

0.9 S of Ordway, Brown, SD

Built 1968 Load: 21.9 t ADT: 570

SD248

Fair

Over: MEDICINE CK

3.9 W LYMAN CO LINE, Jones, SD

Built 1942 Load: 21.9 t ADT: 220

371st Avenue

Fair

Over: Foot Creek

2.3N of Wetonka, McPherson, SD

Built 1956 Load: 21.9 t ADT: 95

IRON LIGHTENING RD

Fair

Over: BEAR CK

0.2 S& 1.5 W RED ELM, Ziebach, SD

Built 1954 Load: 21.9 t ADT: 35

411TH Ave

Fair

Over: Shue Creek

8.6 N Yale, Beadle, SD

Built 1941 Load: 22.0 t ADT: 227

US085

Fair

Over: BELLE FOURCHE RV

0.4 S JCT US 212, Butte, SD

Built 1958 Load: 22.0 t ADT: 10,112

US212 P

Fair

Over: REDWATER RV

1E JCT US85-BELLE FOURCHE, Butte, SD

Built 1995 Load: 22.0 t ADT: 1,418

NASH ST

Fair

Over: SPEARFISH CK

NASH ST - SPEARFISH, Lawrence, SD

Built 1998 Load: 22.0 t ADT: 500

290 STREET

Fair

Over: SOUTH FORK WHETSTONE CK

8.9E & 1.3N BURKE, Gregory, SD

Built 1949 Load: 22.1 t ADT: 65

60th Street North

Fair

Over: Silver Creek

west of Minnesota Avenue, Minnehaha, SD

Built 1948 Load: 22.1 t ADT: 9,815

Local Road

Fair

Over: Trib to White River

8.5E 0.5S CONATA, Pennington, SD

Built 1960 Load: 22.1 t ADT: 15

481st Avenue

Fair

Over: Beaver Creek

1.6S of Canton, Lincoln, SD

Built 1959 Load: 22.2 t ADT: 435

COUNTY HIGHWAY #9

Fair

Over: LITTLE WHITE RV

11.6S & 4.3W WHITE RIVER, Mellette, SD

Built 1970 Load: 22.3 t ADT: 18

SHERIDAN LAKE ROAD

Fair

Over: RAPID CK

.4N SHERIDAN LK &SD44 -RC, Pennington, SD

Built 1973 Load: 22.3 t ADT: 4,800

473RD AVENUE

Fair

Over: CK

2E & 5.1S BROOKINGS, Brookings, SD

Built 1976 Load: 22.4 t ADT: 92

STATE HIGHWAY 47

Fair

Over: BIG BEND DAM SPILLWAY

1 Mi. So. of Ft. Thompson, Buffalo, SD

Built 1963 Load: 22.4 t ADT: 676

US014

Fair

Over: DRAW

2.6 SW HAAKON CO LINE, Jackson, SD

Built 1954 Load: 22.4 t ADT: 970

SD248

Fair

Over: MEDICINE CK

0.2 W LYMAN CO LINE, Jones, SD

Built 1941 Load: 22.4 t ADT: 220

COUNTY HIGHWAY #11

Fair

Over: LITTLE WHITE RV

10.7N & 4.8E WHITE RIVER, Mellette, SD

Built 1962 Load: 22.4 t ADT: 35

SD011

Fair

Over: CK

3.7 SW MINNESOTA LINE, Minnehaha, SD

Built 1963 Load: 22.4 t ADT: 2,154

Park Road

Fair

Over: Devils Gulch Creek

north of 5th Street, Minnehaha, SD

Built 1935 Load: 22.4 t ADT: 30

222ND STREET

Fair

Over: TRIB TO CHEYENNE RIVER

3.5E 5S CREIGHTON, Pennington, SD

Built 1960 Load: 22.4 t ADT: 17

31490 477TH AVE

Fair

Over: BR BRULE CK

4.3N JCT SD 50, Union, SD

Built 1955 Load: 22.4 t ADT: 300

US081

Fair

Over: MARNE CK

0.4 N JCT SD 50, Yankton, SD

Built 1959 Load: 22.4 t ADT: 16,539

ELK CREEK RD.

Fair

Over: MORRIS CK

13S&20.4E STURGIS, Meade, SD

Built 1954 Load: 22.5 t ADT: 66

BEAR CREEK RD

Fair

Over: BEAR CK

0.8E 3.0N SCENIC, Pennington, SD

Built 1982 Load: 22.5 t ADT: 45

220 AVENUE

Fair

Over: BEAR IN THE LODGE CK

13.4N 1.4E MARTIN, Bennett, SD

Built 1963 Load: 22.6 t ADT: 40

SD079

Fair

Over: BELLE FOURCHE RV

2.0 N MEADE CO LINE, Butte, SD

Built 1985 Load: 22.6 t ADT: 1,898

43410 290 ST.

Fair

Over: CK

4.0S,3.1E OF MENNO, Hutchinson, SD

Built 1980 Load: 22.6 t ADT: 45

365 AVENUE

Fair

Over: SMITH CK

3.5E & 12.1N KIMBALL, Brule, SD

Built 1956 Load: 22.7 t ADT: 15

365 AVENUE

Fair

Over: SMITH CK

3.5E & 11.7N KIMBALL, Brule, SD

Built 1956 Load: 22.7 t ADT: 15

N. Lake Drive

Fair

Over: Creek

0.3SW of Jct with SD 20, Codington, SD

Built 1931 Load: 22.7 t ADT: 640

154 ST

Fair

Over: CK

2.8E & 5.0S MILBANK, Grant, SD

Built 2005 Load: 22.7 t ADT: 35

IRR SD073

Fair

Over: SETTIN UP CK

5.0 S JCT SD 44, Jackson, SD

Built 2012 Load: 22.7 t ADT: 577

47340 310TH ST

Fair

Over: CK

12S & 1.4E BERESFORD, Union, SD

Built 1935 Load: 22.7 t ADT: 25

202nd Street

Fair

Over: Shue Creek

1.5N & 2.3W of Yale, Beadle, SD

Built 1977 Load: 22.8 t ADT: 66

395th Avenue

Fair

Over: James River

1W & 1.8N of Stratford, Brown, SD

Built 1964 Load: 22.8 t ADT: 244

365 AVE FAS 6115

Fair

Over: BR SMITH CK

3.5E & 10.8N KIMBALL, Brule, SD

Built 1956 Load: 22.8 t ADT: 15

260TH STREET

Fair

Over: TRIB TO BEAVER CK

2N & 0.1W VALLEY SPRINGS, Minnehaha, SD

Built 1934 Load: 22.8 t ADT: 25

SPRING CREEK ROAD

Fair

Over: SPRING CK

9.5E 4.2N HAYWARD, Pennington, SD

Built 1960 Load: 22.8 t ADT: 389

CROOKED CREEK RD

Fair

Over: BULL CK

2.7 E OF WASTA, Pennington, SD

Built 1962 Load: 22.8 t ADT: 39

304th Avenue

Fair

Over: Spring Creek

1 S & 2 W of Herreid, Campbell, SD

Built 1954 Load: 22.9 t ADT: 180

243th Street

Fair

Over: Creek

1.1W & 1S Murdo, Jones, SD

Built 1935 Load: 22.9 t ADT: 10

BIG FOOT RD

Fair

Over: COTTONWOOD CK

3.0E & 1.0N OF QUINN, Pennington, SD

Built 1987 Load: 22.9 t ADT: 27

SD022

Fair

Over: CK

5.4 E I 29 INTERCH, Deuel, SD

Built 1959 Load: 23.0 t ADT: 1,723

SD248

Fair

Over: BRAVE BULL CK

1.7 W OF BELVIDERE, Jackson, SD

Built 1942 Load: 23.0 t ADT: 152

SD248

Fair

Over: MEDICINE CK

3.1 W LYMAN CO LINE, Jones, SD

Built 1941 Load: 23.0 t ADT: 220

296 STREET

Fair

Over: CK

2.5N & 5.5E MILLBORO, Tripp, SD

Built 1958 Load: 23.0 t ADT: 90

Showing 1,051-1,100 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.