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

413th Avenue

Poor

Over: Middle Pearl Creek

5.2S & 4E of Cavour, Beadle, SD

Built 1930 Load: 11.6 t ADT: 119

477TH AVENUE

Poor

Over: DEER CK

1W & 1.1N BUSHNELL, Brookings, SD

Built 1930 Load: 11.6 t ADT: 92

136TH PL

Poor

Over: SPRING CK

9E & 4.9N STURGIS, Meade, SD

Built 1955 Load: 11.7 t ADT: 15

2ND AVE (GARY)

Poor

Over: W Br Lac qui Parle River

SECOND AVE. GARY, Deuel, SD

Built 1930 Load: 11.8 t ADT: 50

175 ST

Poor

Over: CK

3S & 0.3E ROCKHAM, Hand, SD

Built 1978 Load: 11.8 t ADT: 35

369TH AVE

Poor

Over: SAND CK

13.7S VAYLAND, Hand, SD

Built 1932 Load: 11.8 t ADT: 37

462 AVE

Poor

Over: ROUND & BRANT LK

2.0W & 2.5N CHESTER, Lake, SD

Built 1977 Load: 11.8 t ADT: 131

416th Avenue

Poor

Over: Creek

3 W & 2 N of Pierpont, Day, SD

Built 1932 Load: 11.9 t ADT: 24

354 AVENUE

Poor

Over: PONCA CK

0.2W & 3.6S ST. CHARLES, Gregory, SD

Built 1952 Load: 11.9 t ADT: 189

209TH STREET

Poor

Over: CK

2N & 1.5E BUSHNELL, Brookings, SD

Built 1913 Load: 12.0 t ADT: 92

197th Street

Poor

Over: Creek

2.5W & 2N of Broadland, Beadle, SD

Built 1928 Load: 12.1 t ADT: 56

191st Street

Poor

Over: Turtle Creek

11N & 2.9E of Wessington, Beadle, SD

Built 1913 Load: 12.2 t ADT: 56

193rd Street

Poor

Over: Unnamed Creek

0.8W & 3S of Bloomfield, Beadle, SD

Built 1940 Load: 12.2 t ADT: 56

411th Avenue

Poor

Over: Middle Pearl Creek

5.1S & 2E of Cavour, Beadle, SD

Built 1920 Load: 12.2 t ADT: 56

203rd Street

Poor

Over: Pearl Creek

5N & 4.9W of Iroquois, Beadle, SD

Built 1924 Load: 12.2 t ADT: 56

30420 426th Avenue

Poor

Over: Beaver Creek

1W & 1.8N of Tabor, Bon Homme, SD

Built 1930 Load: 12.2 t ADT: 60

407th Avenue

Poor

Over: Mud Creek

4.4S & 1E of Groton, Brown, SD

Built 1935 Load: 12.2 t ADT: 98

OLD HWY 212

Poor

Over: SULPHUR CK

20.2E 6.7N NEWELL, Butte, SD

Built 1940 Load: 12.2 t ADT: 20

38710 294th Street

Poor

Over: Creek

1.0S & 0.9W of Ravina, Charles Mix, SD

Built 1930 Load: 12.2 t ADT: 48

HARMON DRIVE

Poor

Over: MITCHELL LK

2.1W & 4.0N OF MITCHELL, Davison, SD

Built 2000 Load: 12.2 t ADT: 350

369th Avenue

Poor

Over: Unnamed Creek

11E & 7.4N of Ipswich, Edmunds, SD

Built 1980 Load: 12.2 t ADT: 31

COUNTY RD (SD 298)

Poor

Over: BURLINGTON NORTHERN RR

0.2 E IGLOO BHOD RD, Fall River, SD

Built 1945 Load: 12.2 t ADT: 20

476th Avenue

Poor

Over: S Fork of Beaver Creek

1.8S & 4W of Canton, Lincoln, SD

Built 1963 Load: 12.2 t ADT: 117

River Road

Poor

Over: Creek

13.5S & 7.1W of Presho, Lyman, SD

Built 1965 Load: 12.2 t ADT: 16

Shades Road

Poor

Over: Creek

13.5S & 2.7E of Kennebec, Lyman, SD

Built 1955 Load: 12.2 t ADT: 10

418th Avenue

Poor

Over: Spain & Langford Ditch

1W & 6.2N of Langford, Marshall, SD

Built 1979 Load: 12.2 t ADT: 50

TOWN STREET (US16)

Poor

Over: ABANDON LINE RR

OLD HWY16-N EDGE TOWN- HC, Pennington, SD

Built 1930 Load: 12.2 t ADT: 1,000

450th Avenue

Poor

Over: Little Minnesota River

5W & 1N of Claire City, Roberts, SD

Built 1950 Load: 12.2 t ADT: 35

454th Avenue

Poor

Over: Creek

4.6S & 1W of Claire City, Roberts, SD

Built 1950 Load: 12.2 t ADT: 25

464th Avenue

Poor

Over: N. Fork Whetstone Rv

3W & 3.5N of Wilmot, Roberts, SD

Built 1929 Load: 12.2 t ADT: 20

138th Street

Poor

Over: Creek

1.8S & 3W of Wilmot, Roberts, SD

Built 1938 Load: 12.2 t ADT: 10

465th Avenue

Poor

Over: Creek

2W & 0.5S of Wilmot, Roberts, SD

Built 1945 Load: 12.2 t ADT: 31

466th Avenue

Poor

Over: Creek

2N & 1W of Wilmot, Roberts, SD

Built 1940 Load: 12.2 t ADT: 38

469th Avenue

Poor

Over: Creek

3W of Corona, Roberts, SD

Built 1935 Load: 12.2 t ADT: 17

220 ST.

Poor

Over: CK

0.4E 13N ARTESIAN, Sanborn, SD

Built 1920 Load: 12.2 t ADT: 56

151ST ST

Poor

Over: Snake Creek

5.8W 3.0S MANSFIELD, Spink, SD

Built 1935 Load: 12.2 t ADT: 31

151ST ST

Poor

Over: SNAKE CREEK

3N 5.1W NORTHVILLE, Spink, SD

Built 1935 Load: 12.2 t ADT: 31

187TH ST

Poor

Over: TURTLE CREEK

7.7W 4.0S TULARE, Spink, SD

Built 1912 Load: 12.2 t ADT: 38

165TH ST

Poor

Over: South Fork Snake Creek

1S 3.1W ATHOL, Spink, SD

Built 1925 Load: 12.2 t ADT: 55

182nd Street

Poor

Over: TURTLE CREEK

1N 5W TULARE, Spink, SD

Built 1935 Load: 12.2 t ADT: 22

382ND AVE

Poor

Over: CREEK

0.5N ATHOL, Spink, SD

Built 1909 Load: 12.2 t ADT: 85

164TH ST

Poor

Over: CREEK

1.2N 1.9W ASHTON, Spink, SD

Built 1930 Load: 12.2 t ADT: 31

162ND ST

Poor

Over: James River

3.3N 1.6E ASHTON, Spink, SD

Built 1935 Load: 12.2 t ADT: 55

390TH AVE

Poor

Over: James River

4.0E 2.6N REDFIELD, Spink, SD

Built 1930 Load: 12.2 t ADT: 55

392ND AVE

Poor

Over: MUD CREEK

3.4W 1.8N BRENTFORD, Spink, SD

Built 1935 Load: 12.2 t ADT: 44

311 AVENUE

Poor

Over: DOG EAR CK

7E & 5.8N WITTEN, Tripp, SD

Built 1963 Load: 12.2 t ADT: 31

47230 306 STR.

Poor

Over: BRULE CK

8S & 0.3E BERESFORD, Union, SD

Built 1979 Load: 12.2 t ADT: 35

30010 478 AVE.

Poor

Over: CK

0.5W & 0.9N ALCESTER, Union, SD

Built 1982 Load: 12.2 t ADT: 45

376th Avenue

Poor

Over: Cain Creek

2E & 0.4S of Wessington, Beadle, SD

Built 1954 Load: 12.3 t ADT: 56

42130 CO. RD. 11

Poor

Over: PLUM CK

1.3N,11.3E PARKSTON, Hutchinson, SD

Built 1935 Load: 12.4 t ADT: 69

Showing 5,101-5,150 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.