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

48510 299TH STR.

Good

Over: FINNIE CK

6.1E & 2N ALCESTER, Union, SD

Built 2020 Load: 36.2 t ADT: 185

DOUGLAS AVENUE

Good

Over: MARNE CREEK

DOUGLAS AVENUE - YANKTON, Yankton, SD

Built 1999 Load: 36.2 t ADT: 50

IRR BIA RTE 30

Good

Over: LITTLE WHITE RIVER

1.5MI W SPRING CRK SCHOOL, Todd, SD

Built 1994 Load: 36.3 t ADT: 158

SD050

Good

Over: SD 50 WL SO DAK OWNED R

2 NW OF VERMILLION, Clay, SD

Built 1981 Load: 36.3 t ADT: 4,888

TWNSHP RD 474TH AV

Good

Over: Deer Creek

4 W & 0.7 S TORONTO, Deuel, SD

Built 2021 Load: 36.3 t ADT: 30

TWNSHP RD 170TH ST

Good

Over: CK

2.0N 3.9E TUNERVILLE, Deuel, SD

Built 2020 Load: 36.3 t ADT: 25

472 AVENUE

Good

Over: Trib to S Fork Whetstone

1E & 3.2N TWIN BROOKS, Grant, SD

Built 2021 Load: 36.3 t ADT: 332

WAGNER RD

Good

Over: BIG NASTY CK

0.4 S OF RALPH, Harding, SD

Built 2017 Load: 36.3 t ADT: 23

SD115

Good

Over: TRIB NINE MILE CK

1.5W & 1.2N HARRISBURG, Lincoln, SD

Built 2019 Load: 36.3 t ADT: 6,280

296th Street

Good

Over: Trib. to E Brule Creek

1N & 5.9E of Beresford, Lincoln, SD

Built 1990 Load: 36.3 t ADT: 45

I090 W

Good

Over: SPLIT ROCK CK

0.4 E SD 11 INTERCH, Minnehaha, SD

Built 2018 Load: 36.3 t ADT: 11,910

122nd Street

Good

Over: Little Minnesota River

8E & 3S of Sisseton, Roberts, SD

Built 2020 Load: 36.3 t ADT: 198

US018

Good

Over: HURLEY CK

1.9 E JCT SD 19, Turner, SD

Built 2019 Load: 36.3 t ADT: 1,990

30630 473 AVE.

Good

Over: CK

1E & 8.3S BERESFORD, Union, SD

Built 1978 Load: 36.3 t ADT: 41

IRR SD044

Good

Over: PASS CK

5.2 E JCT SD 73, Jackson, SD

Built 1980 Load: 36.4 t ADT: 455

I090 E

Good

Over: 305 AVE

W PRESHO INTERCHANGE, Lyman, SD

Built 1970 Load: 36.4 t ADT: 3,715

SD034

Good

Over: ELM CK

12 SW OF UNION CENTER, Meade, SD

Built 2012 Load: 36.4 t ADT: 847

478TH AVE HWY 121

Good

Over: SLIP-UP CREEK

4E & 0.9S BALTIC, Minnehaha, SD

Built 2013 Load: 36.4 t ADT: 1,116

SD050 E

Good

Over: JAMES RV

6.2 E JCT US 81, Yankton, SD

Built 1985 Load: 36.4 t ADT: 2,763

44780 301st Street

Good

Over: Clay Creek

4.2W & 4.0S of Irene, Yankton, SD

Built 2020 Load: 36.4 t ADT: 50

IRR BIA RTE 1

Good

Over: BEAR IN THE LODGE CREEK

8 KM S 7.2 KM E INTERIOR, Jackson, SD

Built 1986 Load: 36.5 t ADT: 146

IRR BIA RTE 4

Good

Over: FIRE STEEL CREEK

8 KM EAST OF HWY 65, Corson, SD

Built 1987 Load: 36.5 t ADT: 45

US212

Good

Over: HORSE CK

0.3 N JCT SD 79 S, Butte, SD

Built 2005 Load: 36.5 t ADT: 2,418

469th Avenue

Good

Over: Trib. to Saddle Creek

9.7S & 3E of Lennox, Lincoln, SD

Built 2016 Load: 36.5 t ADT: 135

US018

Good

Over: CK

2.0 W OF CANTON, Lincoln, SD

Built 1980 Load: 36.5 t ADT: 6,695

474th Avenue

Good

Over: N. Fork Whetstone Rv

2E & 1.4N of Corona, Roberts, SD

Built 2003 Load: 36.5 t ADT: 125

IRR BIA RTE 8

Good

Over: STOVE CREEK

7.1 KM SW OF US-212/BIA-8, Dewey, SD

Built 2013 Load: 36.5 t ADT: 110

483RD AVENUE

Good

Over: CK

3.3N & 3W ELKTON, Brookings, SD

Built 2009 Load: 36.6 t ADT: 92

SD032

Good

Over: BIG SIOUX RV

1.7 W JCT SD 13, Moody, SD

Built 1977 Load: 36.6 t ADT: 3,322

458TH AVENUE

Good

Over: CK

2W & 0.2S DAVIS, Turner, SD

Built 2020 Load: 36.6 t ADT: 75

446th Avenue

Good

Over: Dolph Creek

4W & 0.2N of Lake Norden, Hamlin, SD

Built 2018 Load: 36.7 t ADT: 66

Yankton Trails Prk

Good

Over: Big Sioux River

north of 57th Street, Minnehaha, SD

Built 1993 Load: 36.7 t ADT: 50

NECK YOKE ROAD

Good

Over: SPRING CK

.1S .1E REPTILE GAR., Pennington, SD

Built 1973 Load: 36.7 t ADT: 3,365

LACROSSE ST

Good

Over: I090

LACROSSE ST INTERCHANGE, Pennington, SD

Built 2022 Load: 36.7 t ADT: 16,908

SD044

Good

Over: VERMILLION RV

1.4 E JCT SD 19, Turner, SD

Built 1968 Load: 36.7 t ADT: 1,034

47910 299 ST

Good

Over: CK

2N & 0.1E ALCESTER, Union, SD

Built 2004 Load: 36.7 t ADT: 125

US014A

Good

Over: I090

US 14A INTERCHANGE, Lawrence, SD

Built 2016 Load: 36.8 t ADT: 10,868

PLEASANT VALLEY RD

Good

Over: I090

3.2NW TILFORD INTERCHANGE, Meade, SD

Built 2023 Load: 36.8 t ADT: 433

IRR AR SD044

Good

Over: CORN CK

0.6 W JCT SD 63, Mellette, SD

Built 1980 Load: 36.8 t ADT: 455

SD231

Good

Over: BOXELDER CK

0.8 S MEADE CO LINE, Pennington, SD

Built 1974 Load: 36.8 t ADT: 9,148

410th Avenue

Good

Over: Middle Pearl Creek

1E & 5.8S of Cavour, Beadle, SD

Built 2019 Load: 36.9 t ADT: 171

133rd Street

Good

Over: Mina Lake

1.5W of Brown Co. Line, Edmunds, SD

Built 2008 Load: 36.9 t ADT: 200

SD044

Good

Over: PONY CK

0.2 W JCT SD 37, Hutchinson, SD

Built 1959 Load: 36.9 t ADT: 1,598

US083

Good

Over: ANTELOPE CK

0.5 S STANLEY CO LINE, Lyman, SD

Built 2004 Load: 36.9 t ADT: 2,470

NEW UNDERWOOD RD.

Good

Over: ELK CK

3.2 N PENN. CO LN, Meade, SD

Built 1992 Load: 36.9 t ADT: 162

SD115

Good

Over: CK

0.1 W OF DELL RAPIDS, Minnehaha, SD

Built 2018 Load: 36.9 t ADT: 3,668

I229 S

Good

Over: BIG SIOUX RV

0.4 N RICE ST INTERCH, Minnehaha, SD

Built 2000 Load: 36.9 t ADT: 14,390

478 AVE (FAS 1157)

Good

Over: I090

2 E I 229 INTERCHANGE, Minnehaha, SD

Built 2019 Load: 36.9 t ADT: 2,533

151ST ST

Good

Over: MUD CREEK

3.0N 1.5W BRENTFORD, Spink, SD

Built 2020 Load: 36.9 t ADT: 26

IRR BIA RTE 5

Good

Over: LITTLE WHITE RIVER

16 KM NE OF SPRING CREEK, Todd, SD

Built 2016 Load: 36.9 t ADT: 1,096

Showing 3,951-4,000 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.