County profile · official public datasets

Hyde County, SD

23 public highway bridges tracked in the FHWA National Bridge Inventory: 34.8% rated Good, 39.1% Fair, 26.1% Poor.

Compiled by PlainBridges

23
Public bridges: 34.8%
Good condition: 26.1%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Hyde County posts a higher-than-median Poor-condition share among rated counties in the state across rated county bridge inventory.

56th
of 66 on Poor share: 26.1%
Poor-condition share: 23
public highway bridges: 1974
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Hyde County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Hyde County ranks #56 of 66 South Dakota counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 26.1%). Hyde County, South Dakota contains 23 public highway bridges. Roughly 34.8% are rated “Good,” 39.1% “Fair,” and 26.1% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

Total bridges

23

Public highway bridges in Hyde County

Good condition

34.8%

8 of 23 rated 7-9

Fair condition

39.1%

9 of 23 rated 5-6

Poor condition

26.1%

6 of 23 rated 4 or below

In-state Poor-share rank

#56 of 66

Among South Dakota counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 23 NBI-tracked bridges by lowest applicable component rating.

Good

34.8% (8)

Fair

39.1% (9)

Poor

26.1% (6)

Hyde County's Poor-condition bridges carry 1,569 vehicle crossings a day

That is 28.6% of the county's reported daily bridge traffic on 26.1% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 262 crossings a day against 193 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 23 of 23 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

60.9% of Hyde County's bridges have passed the 50-year mark

14 of the 23 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 34.8% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

One structure carries 55.7% of the county's Poor-condition bridge traffic

IRR SD034 over CAMPBELL CK, built 1963, carries 874 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 6-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 1,569 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

2
1930s

1
1950s

5
1960s

5
1970s

2
2000s

6
2010s

1
2020s

1

What this shows Construction peaked in the 2000s, when 6 of the county's bridges still in the inventory were built, which is 26.1% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year (1974) matches the South Dakota average (1975).

How Hyde County compares with South Dakota's closest counties by inventory size

The 5 South Dakota counties nearest Hyde County in number of bridges, with their condition splits. Its 26.1% Poor share is the 5th-lowest of these 6. Its average build year of 1974 against a peer-group mean of 1984 is 10 years older.

Showing the 5 closest of 65 South Dakota counties eligible for comparison.

Bridge inventory size and condition shares for Hyde County and the 5 South Dakota counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Buffalo County	25	32%	64%	4%	1976
Potter County	24	54.2%	45.8%	0%	1981
Todd County	24	41.7%	29.2%	29.2%	1986
Hyde County (this page)	23	34.8%	39.1%	26.1%	1974
Clark County	20	60%	40%	0%	1987
Edmunds County	20	35%	40%	25%	1991

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Hyde County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Hyde County, both outside South Dakota so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside SD (23 bridges here).

Franklin County, ID · 23 bridges
Oneida County, ID · 23 bridges
Powder River County, MT · 23 bridges
Keya Paha County, NE · 23 bridges

Similar average build year

Nearest mean year-built outside SD (1974 here).

Knox County, TN · avg 1974 · 588 bridges
Summit County, OH · avg 1974 · 563 bridges
Onondaga County, NY · avg 1974 · 472 bridges
Orange County, NY · avg 1974 · 472 bridges

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 23 Good 8 Fair 9 Poor 6

All bridges (23)

Sort:

216 STREET

Over: BR ELM CK

1.3 E MACS CORNER, Hyde, SD

Built 1957 Load: 19.3 t ADT: 98

339 AVENUE

Over: MEDICINE CK

2E & 3S OF HIGHMORE, Hyde, SD

Built 1969 Load: 20.0 t ADT: 45

341 AVENUE

Over: SOUTH MEDICINE CK

4E 3.5S HIGHMORE, Hyde, SD

Built 1967 Load: 24.5 t ADT: 47

340 AVENUE

Over: CK

3E 2.4N STEPHAN, Hyde, SD

Built 1975 Load: 32.3 t ADT: 14

IRR SD034

Over: WEST FORK ELM CK

0.9 S JCT SD 47 N, Hyde, SD

Built 1955 Load: 36.0 t ADT: 874

328TH AVENUE

Over: CHAPELLE CK

.3W 9.1S HOLABIRD, Hyde, SD

Built 1971 Load: 42.0 t ADT: 53

SD047

Over: CK

9.2 N JCT US 14, Hyde, SD

Built 1964 Load: 45.7 t ADT: 262

SD047

Over: SOUTH MEDICINE CK

2.8 S JCT US 14, Hyde, SD

Built 1959 Load: 48.1 t ADT: 542

IRR AR SD047

Over: BR WEST FORK ELM CK

4 N JCT SD 34, Hyde, SD

Built 1959 Load: 79.9 t ADT: 444

341 AVENUE

Over: WEST FORK ELM CK

4E 3.2S STEPHAN, Hyde, SD

Built 2009 Load: 24.5 t ADT: 60

216 STREET

Over: CK

5 E STEPHAN, Hyde, SD

Built 2015 Load: 24.9 t ADT: 95

IRR SD034

Over: DRAW

4.8MI W JCT SD47, Hyde, SD

Built 2001 Load: 77.3 t ADT: 575

328 AVE

Over: SOUTH CHAPELLE CK

11.3S HOLABIRD, Hyde, SD

Built 2006 Load: 89.8 t ADT: 53

340 AVE

Over: LAKE MITCHELL TRIBUTARY

3E AND 9.8N HIGHMORE, Hyde, SD

Built 2004 Load: 89.8 t ADT: 60

340TH AVENUE

Over: WOLF CK

3E AND 7.6N HIGHMORE, Hyde, SD

Built 2020 Load: 90.7 t ADT: 60

IRR SD034

Over: WEST FORK ELM CK

1.4 W JCT SD 47 N, Hyde, SD

Built 2001 Load: 99.9 t ADT: 575

212 STREET

Over: CK

4N STEPHAN, Hyde, SD

Built 2008 Load: 99.9 t ADT: 65

IRR AR SD047

Over: BR WEST FORK ELM CK

2.4 N JCT SD 34, Hyde, SD

Built 1959 Load: 23.1 t ADT: 444

333RD AVENUE

Over: SOUTH MEDICINE CK

4W 1.2S HIGHMORE, Hyde, SD

Built 1934 Load: 24.5 t ADT: 31

215 STREET

Over: WEST FORK ELM CK

1N 1.2W STEPHAN, Hyde, SD

Built 1928 Load: 27.3 t ADT: 65

326 AVENUE

Over: SOUTH CHAPELLE CK

2W 11.6S HOLABIRD, Hyde, SD

Built 1920 Load: 27.9 t ADT: 65

328TH AVENUE

Over: SOUTH MEDICINE CK

1.2 S HOLABIRD, Hyde, SD

Built 1967 Load: 34.3 t ADT: 90

IRR SD034

Over: CAMPBELL CK

0.4 N BUFFALO CO LINE, Hyde, SD

Built 1963 Load: 99.9 t ADT: 874

Read our methodology - how this data is sourced, computed, and verified.

Related

Browse all → | Rankings →

Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

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Compiled by PlainBridges, Independent data publisher

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.