State profile · Above median Poor share

South Dakota bridge safety

According to the Federal Highway Administration's 2024 National Bridge Inventory, condition ratings, load ratings, and Poor-condition shares for every public highway bridge in South Dakota.

5,887
Public bridges
33.8%
Good condition
16.4%
Poor condition

South Dakota holds 5,887 public highway bridges (#33 of 52 by inventory) with a 16.36% Poor share (#3 of 52 by Poor share).

That is 16.4% of the state's inventory, against an average of 7.5% across the 54 states and territories with Poor-rated bridges on file, which places it 51 of 54 ordered from the lowest Poor share upward. A bridge is rated Poor when its weakest applicable component scores 4 or below on the inspecting agency's 0-9 scale, so the category is a maintenance and funding signal rather than a closure order or a live crossing-safety verdict.

Inventory: FHWA NBI 2024 · last ETL August 2026

Total Bridges

5,887

Public highway bridges in South Dakota

Good Condition

33.8%

1,992 bridges rated 7-9

-16.2pp vs 50% benchmark

Poor Condition

16.4%

963 bridges whose lowest applicable component is rated 0-4

8.8pp vs national avg 7.5%

South Dakota vs national bridge condition

South Dakota - Good condition share 33.8%
National avg

Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).

South Dakota - Poor-condition share 54.5%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.5%.

South Dakota in the national condition pattern

Each point is a state or territory in the FHWA NBI; the highlighted point is this profile.

Inventory size and Poor-condition share are different measures: South Dakota has 5,887 bridges and a 16.4% Poor-condition share in the 2024 NBI, rank #51 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold. Scatter plot of 54 data points. 0%10%20%30%40% 0k20k40k60k Public bridges in inventory (thousands) Poor-condition share (%) SD, Public bridges in inventory (thousands): 5.9k · Poor-condition share (%): 16.36%AL, Public bridges in inventory (thousands): 16.2k · Poor-condition share (%): 3.35%AK, Public bridges in inventory (thousands): 1.7k · Poor-condition share (%): 7.89%AZ, Public bridges in inventory (thousands): 8.6k · Poor-condition share (%): 1.15%AR, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 5.43%CA, Public bridges in inventory (thousands): 25.8k · Poor-condition share (%): 5.91%CO, Public bridges in inventory (thousands): 9k · Poor-condition share (%): 4.82%CT, Public bridges in inventory (thousands): 4.4k · Poor-condition share (%): 4.72%DE, Public bridges in inventory (thousands): 0.9k · Poor-condition share (%): 1.26%DC, Public bridges in inventory (thousands): 0.3k · Poor-condition share (%): 1.95%FL, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 2.79%GA, Public bridges in inventory (thousands): 15.1k · Poor-condition share (%): 1.59%GU, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 12.77%HI, Public bridges in inventory (thousands): 1.2k · Poor-condition share (%): 6.53%ID, Public bridges in inventory (thousands): 4.6k · Poor-condition share (%): 4.9%IL, Public bridges in inventory (thousands): 26.9k · Poor-condition share (%): 9.35%IN, Public bridges in inventory (thousands): 19.5k · Poor-condition share (%): 5.22%IA, Public bridges in inventory (thousands): 23.7k · Poor-condition share (%): 19.16%KS, Public bridges in inventory (thousands): 24.9k · Poor-condition share (%): 5.26%KY, Public bridges in inventory (thousands): 14.5k · Poor-condition share (%): 7.37%LA, Public bridges in inventory (thousands): 12.7k · Poor-condition share (%): 11.48%ME, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 15.41%MD, Public bridges in inventory (thousands): 5.5k · Poor-condition share (%): 4.56%MA, Public bridges in inventory (thousands): 5.3k · Poor-condition share (%): 8.88%MI, Public bridges in inventory (thousands): 11.4k · Poor-condition share (%): 11.27%MN, Public bridges in inventory (thousands): 13.5k · Poor-condition share (%): 4.44%MS, Public bridges in inventory (thousands): 16.7k · Poor-condition share (%): 6.03%MO, Public bridges in inventory (thousands): 24.6k · Poor-condition share (%): 8.95%MT, Public bridges in inventory (thousands): 5.2k · Poor-condition share (%): 6.81%NE, Public bridges in inventory (thousands): 15.4k · Poor-condition share (%): 7.9%NV, Public bridges in inventory (thousands): 2.1k · Poor-condition share (%): 1.14%NH, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 7.51%NJ, Public bridges in inventory (thousands): 6.8k · Poor-condition share (%): 6.01%NM, Public bridges in inventory (thousands): 4k · Poor-condition share (%): 4.51%NY, Public bridges in inventory (thousands): 17.6k · Poor-condition share (%): 9.43%NC, Public bridges in inventory (thousands): 19.2k · Poor-condition share (%): 6.76%ND, Public bridges in inventory (thousands): 4.3k · Poor-condition share (%): 10.98%OH, Public bridges in inventory (thousands): 26.7k · Poor-condition share (%): 4.74%OK, Public bridges in inventory (thousands): 22.9k · Poor-condition share (%): 7.7%OR, Public bridges in inventory (thousands): 8.3k · Poor-condition share (%): 4.61%PA, Public bridges in inventory (thousands): 23.3k · Poor-condition share (%): 12.58%PR, Public bridges in inventory (thousands): 2.4k · Poor-condition share (%): 13.92%RI, Public bridges in inventory (thousands): 0.8k · Poor-condition share (%): 15.2%SC, Public bridges in inventory (thousands): 9.5k · Poor-condition share (%): 6.17%TN, Public bridges in inventory (thousands): 20.4k · Poor-condition share (%): 4.41%TX, Public bridges in inventory (thousands): 56.7k · Poor-condition share (%): 1.23%UT, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 2.91%VT, Public bridges in inventory (thousands): 2.9k · Poor-condition share (%): 2.9%VI, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 29.17%VA, Public bridges in inventory (thousands): 14.1k · Poor-condition share (%): 3.39%WA, Public bridges in inventory (thousands): 8.5k · Poor-condition share (%): 5.45%WV, Public bridges in inventory (thousands): 7.3k · Poor-condition share (%): 18.64%WI, Public bridges in inventory (thousands): 14.4k · Poor-condition share (%): 6.52%WY, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 6.51%
Inventory size and Poor-condition share are different measures: South Dakota has 5,887 bridges and a 16.4% Poor-condition share in the 2024 NBI, rank #51 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold.

South Dakota vs all states by public bridge inventory

Where this state's FHWA NBI public-highway bridge count sits among every state and territory on PlainBridges

5,887 33rd of 54 higher than 21 of 54 states

States and territories, banded by public bridge inventory size

Each bar is a band; taller bars hold more states. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source FHWA National Bridge Inventory · 2024

Read the rank neighborhood for South Dakota

The highlighted point is South Dakota: 5,887 bridges and 16.36% in Poor condition, rank #51 of 54 jurisdictions ordered from the lowest share upward. The five jurisdictions immediately above and below South Dakota on that same Poor-share ordering:

  • Rhode Island: 783 bridges · 15.20% Poor
  • Maine: 2,518 bridges · 15.41% Poor
  • South Dakota: 5,887 bridges · 16.36% Poor
  • West Virginia: 7,348 bridges · 18.64% Poor
  • Iowa: 23,719 bridges · 19.16% Poor

The full national sortable table lives on the rankings page.

Material families in South Dakota

Exclusive FHWA material families across all 5,887 bridges in this state; continuous variants fold into the parent family. Orthogonal to the Poor-share scatter above.

Who maintains South Dakota’s inventory

State agency holds 31.3% of the 5,887 public highway bridges filed under South Dakota in the 2024 NBI, the agency-of-record split for this state, not a condition verdict.

When South Dakota’s bridges were built

Pre-1950 construction accounts for 18.2% of the 5,887 bridges with a recorded original year in South Dakota. Era bands are orthogonal to the Poor-share ranking above.

Condition Distribution

South Dakota33.8%49.8%16.4%GoodFairPoor
Bridge inventory deck-condition mix - South Dakota (FHWA NBI)

Counties (66)

Aurora 61 Beadle 152 Bennett 15 Bon Homme 126 Brookings 233 Brown 170 Brule 38 Buffalo 25 Butte 143 Campbell 15 Charles Mix 103 Clark 20 Clay 94 Codington 74 Corson 49 Custer 95 Davison 123 Day 34 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 40 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 215 Mellette 28 Miner 64 Minnehaha 393 Moody 87 Oglala Lakota 34 Pennington 348 Perkins 60 Potter 24 Roberts 157 Sanborn 53 Spink 176 Stanley 37 Sully 31 Todd 24 Tripp 90 Turner 143 Union 170 Walworth 33 Yankton 99 Ziebach 30

South Dakota vs nearby ranks

Adjacent states by Poor-condition share (lower share = better)

States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below South Dakota on the same metric.

RI

Rhode Island

15.20% top marginal rate
Structure
Progressive
Burden @ $100K
$783

ME

Maine

15.41% top marginal rate
Structure
Progressive
Burden @ $100K
$2,518
Selected

SD

South Dakota

16.36% top marginal rate
Structure
Progressive
Burden @ $100K
$5,887

WV

West Virginia

18.64% top marginal rate
Structure
Progressive
Burden @ $100K
$7,348

IA

Iowa

19.16% top marginal rate
Structure
Progressive
Burden @ $100K
$23,719

Bridges Needing Most Attention in South Dakota

Six lowest-condition bridges in South Dakota, ranked by the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.

SMITHWICK ROAD

Poor

Over: WHITE RIVER

.75 KM NE OF BIA RTE 41, Oglala Lakota, SD

Built 1935 Load: 0.0 t ADT: 10

395th Avenue

Poor

Over: Cain Creek

8.6S & 5W of Huron, Beadle, SD

Built 1926 Load: 0.0 t ADT: 56

216 ST

Poor

Over: SOUTH FORK PEARL CK

8.0S 1.5W CAVOUR, Beadle, SD

Built 1924 Load: 0.0 t ADT: 56

200TH ST

Poor

Over: SHUE CK

8N 0.8E CAVOUR, Beadle, SD

Built 1912 Load: 0.0 t ADT: 56

412th Avenue

Poor

Over: Middle Pearl Creek

5.1S & 3E of Cavour, Beadle, SD

Built 1930 Load: 0.0 t ADT: 56

41480 299th Street

Poor

Over: Emanuel Creek

4N & 1.2W of Tyndall, Bon Homme, SD

Built 1905 Load: 0.0 t ADT: 20

All Bridges in South Dakota

I090 W

Fair

Over: 310 AVE

4 E US 183 INTERCH, Lyman, SD

Built 1970 Load: 36.4 t ADT: 3,745

I090 W

Fair

Over: 312 AVE

6 E US 183 INTERCH, Lyman, SD

Built 1970 Load: 36.4 t ADT: 3,745

I090 E

Fair

Over: 312 AVE

6 E US 183 INTERCH, Lyman, SD

Built 1970 Load: 36.4 t ADT: 3,745

PLAYHOUSE ROAD

Fair

Over: IRON CK

2.3 N. SPOKANE, Pennington, SD

Built 1977 Load: 36.4 t ADT: 487

I090 W

Fair

Over: 158 AVE

3.0 W NEW UNDRWD INTERCH, Pennington, SD

Built 1961 Load: 36.4 t ADT: 8,440

405TH AVE.

Fair

Over: JAMES RV

7.4N FORESTBURG, Sanborn, SD

Built 1969 Load: 36.4 t ADT: 192

IRR BIA RTE 202

Fair

Over: SMITH CREEK

0.8 KM S OF SHELBY, Buffalo, SD

Built 1983 Load: 36.5 t ADT: 147

US014

Fair

Over: PEARL CK

2.8 E OF CAVOUR, Beadle, SD

Built 1965 Load: 36.5 t ADT: 1,883

US016A

Fair

Over: FRENCH CK

1.8 E JCT SD 89 N, Custer, SD

Built 1964 Load: 36.5 t ADT: 1,691

US016A

Fair

Over: FRENCH CK

2.0 E JCT SD 89 N, Custer, SD

Built 1964 Load: 36.5 t ADT: 1,691

SD011

Fair

Over: BEAVER CK

2.5 N JCT US 18, Lincoln, SD

Built 1963 Load: 36.5 t ADT: 2,938

I029 N

Fair

Over: SKUNK CK

0.3 N 26TH ST INTERCH, Minnehaha, SD

Built 1989 Load: 36.5 t ADT: 32,190

318 AVENUE

Fair

Over: WHITE RV

5.7W & 7.5N HAMILL, Tripp, SD

Built 1980 Load: 36.5 t ADT: 47

SD050

Fair

Over: WEST BR EMANUEL CK

0.3 E JCT SD 37 NORTH, Bon Homme, SD

Built 1960 Load: 36.6 t ADT: 2,189

41970 301st Street

Fair

Over: Snatch Creek

3N & 3.2E of Tyndall, Bon Homme, SD

Built 1959 Load: 36.6 t ADT: 345

US085

Fair

Over: HAY CK

0.8 N JCT SD 34, Butte, SD

Built 1963 Load: 36.6 t ADT: 14,896

SD079

Fair

Over: DEADMAN CK

0.6 N NEWELL & JCT 212 E, Butte, SD

Built 1962 Load: 36.6 t ADT: 786

SD040

Fair

Over: BATTLE CK

2.6 W OF HERMOSA, Custer, SD

Built 1986 Load: 36.6 t ADT: 980

273 ST

Fair

Over: PLUM CK

1.6E & 2N of Milltown, Hutchinson, SD

Built 1982 Load: 36.6 t ADT: 35

PARK DRIVE

Fair

Over: RAPID CK

0.2S PARK DR & SD44 - RC, Pennington, SD

Built 1974 Load: 36.6 t ADT: 5,400

US281

Fair

Over: TURTLE CK

0.5 N JCT US 212, Spink, SD

Built 1963 Load: 36.6 t ADT: 2,226

46240 287TH ST.

Fair

Over: VERMILLION RV

2S & 1.4E DAVIS, Turner, SD

Built 1991 Load: 36.6 t ADT: 65

US014 B

Fair

Over: EAST BR SIX MILE CK

1.6 W I 29 INTERCH, Brookings, SD

Built 1968 Load: 36.7 t ADT: 8,734

SD045

Fair

Over: CROW CK

3.9 N BUFFALO CO LINE, Hand, SD

Built 1955 Load: 36.7 t ADT: 503

176 ST

Fair

Over: BRYANT CK

1E & 3.7S ROCKHAM, Hand, SD

Built 1983 Load: 36.7 t ADT: 15

FAIRPOINT RD.

Fair

Over: SULPHUR CK

8.2 N 1.0 E FAIRPOIN, Meade, SD

Built 1977 Load: 36.7 t ADT: 33

I029 N

Fair

Over: 228 ST

8 S BROOKINGS CO LINE, Moody, SD

Built 1967 Load: 36.7 t ADT: 7,685

IRR SD127

Fair

Over: LITTLE MINNESOTA RV

2.7 N JCT SD 10, Roberts, SD

Built 1953 Load: 36.7 t ADT: 838

FAS 3214

Fair

Over: BAD RV

0.6W & 1.8S OF FT. PIERRE, Stanley, SD

Built 1990 Load: 36.7 t ADT: 210

US018

Fair

Over: COTTONWOOD CK

0.5 E JCT US 183N, Tripp, SD

Built 1965 Load: 36.7 t ADT: 1,613

SD046

Fair

Over: CK

0.2 W JCT SD 37, Bon Homme, SD

Built 1935 Load: 36.8 t ADT: 758

I090 W

Fair

Over: 262 AVE

OKATON INTERCHANGE, Jones, SD

Built 1969 Load: 36.8 t ADT: 3,360

US014A

Fair

Over: HOMESTAKE FLUME

7.2 S OF SPEARFISH, Lawrence, SD

Built 1967 Load: 36.8 t ADT: 1,854

S. Marion Road

Fair

Over: Skunk Creek

north of Silver Valley Dr, Minnehaha, SD

Built 2003 Load: 36.8 t ADT: 15,400

US212

Fair

Over: TURTLE CK

0.3 NW JCT US 281 S, Spink, SD

Built 2017 Load: 36.8 t ADT: 1,606

IRR SD046

Fair

Over: DRY CHOTEAU CK

WEST CO LINE, Bon Homme, SD

Built 1964 Load: 36.9 t ADT: 758

SD030

Fair

Over: I029

SD 30 INTERCHANGE, Brookings, SD

Built 1970 Load: 36.9 t ADT: 1,604

US014

Fair

Over: CK

1.6 E I 29 INTERCH, Brookings, SD

Built 1973 Load: 36.9 t ADT: 4,885

SD040

Fair

Over: BILLOVER CK

1.1 E JCT SD 79, Custer, SD

Built 1968 Load: 36.9 t ADT: 665

I090 E

Fair

Over: ST ONGE OIL RD (FAS)

0.7 E US 85 S INTERCH, Lawrence, SD

Built 1971 Load: 36.9 t ADT: 7,465

I229 N

Fair

Over: BIG SIOUX RV

0.4 N RICE ST INTERCH, Minnehaha, SD

Built 2001 Load: 36.9 t ADT: 14,390

I029 S

Fair

Over: 228 ST

8 S BROOKINGS CO LINE, Moody, SD

Built 1967 Load: 36.9 t ADT: 7,685

US012

Fair

Over: SNAKE CK

0.1 E EDMUNDS CO LINE, Brown, SD

Built 1970 Load: 37.0 t ADT: 2,958

US281 S

Fair

Over: MOCCASIN CK

6.7 S JCT US 12, Brown, SD

Built 1972 Load: 37.0 t ADT: 1,836

US281 N

Fair

Over: MOCCASIN CK

6.7 S JCT US 12, Brown, SD

Built 1972 Load: 37.0 t ADT: 1,836

SD044

Fair

Over: LONE TREE CK

2.1 W JCT SD 47, Gregory, SD

Built 1971 Load: 37.0 t ADT: 568

I090 W

Fair

Over: ST ONGE OIL RD (FAS)

0.7 E US 85 S INTERCH, Lawrence, SD

Built 1971 Load: 37.0 t ADT: 7,465

I090 W

Fair

Over: 151 AVE (FAS) DRAW

1.0 E. OF EXIT 67, Pennington, SD

Built 1961 Load: 37.0 t ADT: 8,440

I090 E

Fair

Over: 151 AVE (FAS) DRAW

1.9 E BOX ELDER INTERCH, Pennington, SD

Built 1961 Load: 37.0 t ADT: 8,440

IRR SD063

Fair

Over: CHEYENNE RV

ZIEBACH-HAAKON CO LINE, Ziebach, SD

Built 1981 Load: 37.0 t ADT: 396

Showing 2,201-2,250 of 5,887 bridges

Related

All states → | National rankings → | Understanding conditions → | Retired SD term explained →
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.

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). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.

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.

What to do with this

Use South Dakota's inventory picture to drill to a county or a specific span.

  • Browse counties in South Dakota and open the highest-Poor shares first. County list
  • See where this state sits among peers on Poor-condition share. State rankings
  • Compare this state with another jurisdiction on the same measures. State compare

NBI condition ratings are inventory snapshots, not live crossing-safety verdicts.

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. South Dakota Good/Fair/Poor shares and county rollups on this page are computed from the same NBI extract as the national boards; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.