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

Fair

Over: CK

1.4 SE PIEDMONT INTERCH, Meade, SD

Built 1957 Load: 83.4 t ADT: 20,060

4TH STREET

Fair

Over: HILGERS GULCH

4TH ST - PIERRE, Hughes, SD

Built 1994 Load: 83.9 t ADT: 100

US012

Fair

Over: CK

1.1 W JCT SD 123, Grant, SD

Built 1994 Load: 84.7 t ADT: 1,590

SD025

Fair

Over: WEST FORK VERMILLION RV

3.9 S KINGSBURY CO LINE, Miner, SD

Built 1953 Load: 85.3 t ADT: 797

SD045

Fair

Over: REE CK

1 N JCT US 14, Hand, SD

Built 2002 Load: 86.0 t ADT: 954

US018

Fair

Over: EAST COTTONWOOD CK

1.9 W JCT SD 53, Tripp, SD

Built 1988 Load: 86.0 t ADT: 1,053

DAKOTA AVENUE

Fair

Over: HILGERS GULCH

DAKOTA AVE - PIERRE, Hughes, SD

Built 1995 Load: 86.6 t ADT: 2,315

I029 S

Fair

Over: DRAINAGE DITCH

0.1 S I 90 INTERCH, Minnehaha, SD

Built 2000 Load: 87.2 t ADT: 21,205

IRR AR SD050

Fair

Over: BAD HAND CK

5.4 N JCT I 90 LOOP, Brule, SD

Built 1995 Load: 87.7 t ADT: 949

US014 B

Fair

Over: WEST BR SIX MILE CK

2.5 W I 29 INTERCH, Brookings, SD

Built 1967 Load: 88.9 t ADT: 9,525

SD123

Fair

Over: CK

0.2 N GRANT CO LINE, Roberts, SD

Built 1988 Load: 89.0 t ADT: 276

SD027

Fair

Over: TRIB SPAIN DITCH

3.8 N & 3.6 E of Langford, Marshall, SD

Built 1959 Load: 89.7 t ADT: 613

SD1806

Fair

Over: CK

1.4 N JCT US 14, Stanley, SD

Built 1963 Load: 89.7 t ADT: 1,804

244 ST FAS 6506

Fair

Over: BR SMITH CK

7N & 0.6W KIMBALL, Brule, SD

Built 2005 Load: 89.8 t ADT: 35

SD045

Fair

Over: CK

8.7 S JCT US 14 E, Hand, SD

Built 1928 Load: 89.8 t ADT: 551

SD045

Fair

Over: SPRING CK

3.6 S NORTH DAKOTA LINE, McPherson, SD

Built 1933 Load: 89.8 t ADT: 178

154 STREET

Fair

Over: CK

6S & 0.2W HOVEN, Potter, SD

Built 2007 Load: 89.8 t ADT: 10

Corson County 35

Fair

Over: Grand River

2.4E & 16S THUNDER HAWK, Corson, SD

Built 1990 Load: 90.4 t ADT: 20

SD032

Fair

Over: SQUAW CK

2.0 E I 29 INTERCH, Moody, SD

Built 1977 Load: 90.8 t ADT: 2,043

SD079

Fair

Over: DRY CK

6.4 N FALL RIVER CO LINE, Custer, SD

Built 2004 Load: 91.1 t ADT: 3,672

US016

Fair

Over: SPRING CK

1.6 N OF CUSTER CO LINE, Pennington, SD

Built 1998 Load: 91.3 t ADT: 7,034

US016

Fair

Over: SPRING CK

3.1 N CUSTER CO LINE, Pennington, SD

Built 1998 Load: 91.4 t ADT: 7,034

US016

Fair

Over: SPRING CK

3.0 N OF CUSTER CO LINE, Pennington, SD

Built 1998 Load: 91.6 t ADT: 7,034

SD046

Fair

Over: CK

11.9 E OF BERESFORD, Union, SD

Built 1954 Load: 91.9 t ADT: 1,852

SD079

Fair

Over: ELM CK

1.3 S CUSTER CO LINE, Fall River, SD

Built 2006 Load: 93.2 t ADT: 4,214

24470 422 AVE.

Fair

Over: ROCK CK

3 E & 7.3 N FULTON, Hanson, SD

Built 2008 Load: 93.4 t ADT: 15

SD158

Fair

Over: CK

1.2 W MINNESOTA LINE, Grant, SD

Built 1966 Load: 94.5 t ADT: 270

SD079

Fair

Over: CK

8.9 NE JCT SD 168, Butte, SD

Built 1983 Load: 95.9 t ADT: 388

303rd Avenue

Fair

Over: Creek

4.6S of Akaska, Walworth, SD

Built 1998 Load: 97.0 t ADT: 99

US081

Fair

Over: EAST FORK VERMILLION RV

2.2 E MINER CO LINE, Lake, SD

Built 1983 Load: 98.4 t ADT: 1,744

IRR I029

Fair

Over: HINES CK

0.3 N PEEVER INTERCH, Roberts, SD

Built 1978 Load: 98.7 t ADT: 4,890

IRR I029

Fair

Over: CK

4.2 S PEEVER INTERCH, Roberts, SD

Built 1978 Load: 99.4 t ADT: 5,340

I029 NF

Fair

Over: CK

2 N I29 & SD 324 INTERCH, Brookings, SD

Built 1967 Load: 99.7 t ADT: 410

US212 SER RD

Fair

Over: CK

1.9 E JCT US 81, Codington, SD

Built 1970 Load: 99.7 t ADT: 12,968

I029

Fair

Over: DEER CK

0.8 S SD 28 INTERCH, Deuel, SD

Built 1971 Load: 99.7 t ADT: 7,560

101st Street

Fair

Over: Maple River

6.3N & 2.4E of Frederick, Brown, SD

Built 2007 Load: 99.9 t ADT: 98

SD034

Fair

Over: WILLOW CK

0.7 E JCT US 85, Butte, SD

Built 1939 Load: 99.9 t ADT: 3,661

SD1804

Fair

Over: OAHE RESERVOIR LK

2.7 NW OF POLLOCK, Campbell, SD

Built 1980 Load: 99.9 t ADT: 168

SD045

Fair

Over: CK

1.6 S BRULE CO LINE, Charles Mix, SD

Built 1948 Load: 99.9 t ADT: 963

IRR SD046

Fair

Over: CK

0.9 E OF WAGNER, Charles Mix, SD

Built 1968 Load: 99.9 t ADT: 1,273

IRR US012

Fair

Over: CK

3.1 E JCT SD 65 S, Corson, SD

Built 1964 Load: 99.9 t ADT: 402

US016A

Fair

Over: GRACE COOLIDGE CK

5.5 E JCT SD 87 N, Custer, SD

Built 1988 Load: 99.9 t ADT: 1,335

142nd Street

Fair

Over: Creek

8S & 2E of Ipswich, Edmunds, SD

Built 2009 Load: 99.9 t ADT: 209

126th Street

Fair

Over: Creek

8N & 5.4E of Craven Cor, Edmunds, SD

Built 2004 Load: 99.9 t ADT: 25

US018

Fair

Over: CK

4.4 E JCT US 385 S, Fall River, SD

Built 1952 Load: 99.9 t ADT: 676

SD123

Fair

Over: CK

0.8 S ROBERTS CO LINE, Grant, SD

Built 1988 Load: 99.9 t ADT: 276

US012

Fair

Over: CK

1.9 SE JCT SD 123, Grant, SD

Built 1997 Load: 99.9 t ADT: 1,722

347 AVENUE

Fair

Over: CK

7.6S & 3E BURKE, Gregory, SD

Built 1988 Load: 99.9 t ADT: 36

US014

Fair

Over: CK

10.3 E OF PHILIP, Haakon, SD

Built 1994 Load: 99.9 t ADT: 725

US014

Fair

Over: CK

12.6 E OF PHILIP, Haakon, SD

Built 1994 Load: 99.9 t ADT: 725

Showing 2,851-2,900 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.