County profile · official public datasets

Haakon County, SD

69 public highway bridges tracked in the FHWA National Bridge Inventory: 29% rated Good, 58% Fair, 13% Poor.

69
Public bridges: 29%
Good condition: 13%
Poor condition

The verdict

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

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

Top 44%
lowest Poor share in state: 13%
Poor-condition share: 69
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.

Haakon County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Haakon County ranks #29 of 66 South Dakota counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 13%). Haakon County, South Dakota contains 69 public highway bridges. Roughly 29% are rated “Good,” 58% “Fair,” and 13% “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

Public highway bridges in Haakon County

Good condition

29%

20 of 69 rated 7-9

Fair condition

58%

40 of 69 rated 5-6

Poor condition

13%

9 of 69 rated 4 or below

In-state Poor-share rank

#29 of 66

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

Condition distribution

Share of 69 NBI-tracked bridges by lowest applicable component rating.

Good

29% (20)

Fair

58% (40)

Poor

13% (9)

Haakon County's Poor-condition bridges carry 1,605 vehicle crossings a day

That is 8.3% of the county's reported daily bridge traffic on 13% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 178 crossings a day against 111 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 69 of 69 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

55.1% of Haakon County's bridges have passed the 50-year mark

38 of the 69 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 29% 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 45.2% of the county's Poor-condition bridge traffic

US014 over BELCHER CK, built 1955, carries 725 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 9-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 1,605 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

1
1930s

2
1940s

1
1950s

17
1960s

14
1970s

4
1980s

7
1990s

14
2000s

6
2010s

3

What this shows Construction peaked in the 1950s, when 17 of the county's bridges still in the inventory were built, which is 24.6% of those with a recorded year. That cohort is now 65 to 74 years old in the 2024 inventory. Its average build year (1974) matches the South Dakota average (1975).

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

The 5 South Dakota counties nearest Haakon County in number of bridges, with their condition splits. Its 13% Poor share is the 3rd-lowest of these 6. Its average build year of 1974 against a peer-group mean of 1975 is in line with the group.

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

Bridge inventory size and condition shares for Haakon County and the 5 South Dakota counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Codington County	74	20.3%	63.5%	16.2%	1976
Deuel County	72	22.2%	61.1%	16.7%	1971
Haakon County (this page)	69	29%	58%	13%	1974
Miner County	64	35.9%	37.5%	26.6%	1970
Hamlin County	62	41.9%	45.2%	12.9%	1978
Hanson County	62	19.4%	71%	9.7%	1978

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 Haakon 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 Haakon County, both outside South Dakota so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside SD (69 bridges here).

Irwin County, GA · 69 bridges
Edwards County, KS · 69 bridges
Barry County, MI · 69 bridges
Maries County, MO · 69 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 69 Good 20 Fair 40 Poor 9

Fair-condition bridges (40)

Sort:

Haakon County Bridge Snapshot

Condition distribution

Haakon County's Poor-condition bridges carry 1,605 vehicle crossings a day

55.1% of Haakon County's bridges have passed the 50-year mark

One structure carries 45.2% of the county's Poor-condition bridge traffic

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

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Fair-condition bridges (40)

204th Street

FAS 6253

Hudson Flat Road

Belvidere Road

E. Grindstone Rd.

US014

10 Mile Road

US014

Slovak Road

COUCH ROAD

Harding Grove Road

US014

US014

SD063

SD034

US014

FAS 6521

FAS 6159/Otumwa Rd

US014

FAS 6188

US014

Northwestern Ave

SD073

Kirley Road

Northwestern Ave

US014

SD034

US014

Otumwa Road

SD073

SD073

US014

FAS 8521

US014

US014

US014

US014

US014

Manilla Road

US014

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