Total bridges
69
Public highway bridges in Haakon County
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.
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.
When Haakon County's bridges were built
69 bridges with a recorded construction year, grouped by decade
- 1920s 1
1920–1929
1 bridges
- 1930s 2
1930–1939
2 bridges
- 1940s 1
1940–1949
1 bridges
- 1950s
1950–1959
17 bridges
- 1960s
1960–1969
14 bridges
- 1970s 4
1970–1979
4 bridges
- 1980s
1980–1989
7 bridges
- 1990s
1990–1999
14 bridges
- 2000s 6
2000–2009
6 bridges
- 2010s 3
2010–2019
3 bridges
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.
| 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 bridges (69)
Ash Creek Road
GoodOver: UPPER DEEP CREEK
10.6 W & 3.1 S MILESVILLE, Haakon, SD
Built 2015 Load: 24.9 t ADT: 7
243rd Ave.
GoodOver: MITCHELL CK
4 W & 6.2 N MIDLAND, Haakon, SD
Built 1965 Load: 29.8 t ADT: 28
SD063
GoodOver: HERMAPHRODITE CK
0.5 S ZIEB-HAAK CO LINE, Haakon, SD
Built 1981 Load: 31.8 t ADT: 396
Deadman Creek Road
GoodOver: DEADMANS CK
7.3 N & 9 W PHILIP, Haakon, SD
Built 1955 Load: 32.4 t ADT: 53
Dusty Ridge Road
GoodOver: MITCHELL CK
2 W & 5.1 N MIDLAND, Haakon, SD
Built 1960 Load: 32.9 t ADT: 39
SD034
GoodOver: NORTH PLUM CK
9.1 W STANLEY CO LINE, Haakon, SD
Built 1959 Load: 35.5 t ADT: 364
Nolan Road
GoodOver: INDIAN CK
15.8 E & 1 S PHILIP, Haakon, SD
Built 2002 Load: 37.3 t ADT: 5
Nowlin Road
GoodOver: HAY DRAW CK
17.9 E PHILIP, Haakon, SD
Built 2002 Load: 39.8 t ADT: 25
Hilland Road
GoodOver: ASH CK
13.2 W 19.5 N PHILIP, Haakon, SD
Built 1983 Load: 76.9 t ADT: 28
US014
GoodOver: MEDICINE CK
9.3 E OF PHILIP, Haakon, SD
Built 1994 Load: 84.5 t ADT: 725
10 Mile Road
PoorOver: MEXICAN CK
7.4W & 10N PHILIP, Haakon, SD
Built 1950 Load: 10.1 t ADT: 58
Main Street
PoorOver: MITCHELL CK
MIDLAND, Haakon, SD
Built 1955 Load: 12.7 t ADT: 45
FAS 6253
PoorOver: NORTH FORK BAD RV
15 W 6.8N PHILIP, Haakon, SD
Built 1950 Load: 13.3 t ADT: 48
Hanson Avenue
PoorOver: MITCHELL CK
6.2 W & 7.9 N MIDLAND, Haakon, SD
Built 1986 Load: 14.8 t ADT: 28
Four Corners Road
PoorOver: CHEYENNE RV
15.7W 4.4N MILESVILL, Haakon, SD
Built 1930 Load: 18.3 t ADT: 45
COUNTY RD
PoorOver: CK
MIDLAND, Haakon, SD
Built 1941 Load: 19.1 t ADT: 30
US014 EF
PoorOver: LONE TREE CK
3.2 S STANLEY CO LINE, Haakon, SD
Built 1920 Load: 25.1 t ADT: 50
IRR SD034
PoorOver: CHEYENNE RV
ZIEBACH CO LINE, Haakon, SD
Built 1962 Load: 30.8 t ADT: 576
US014
PoorOver: BELCHER CK
4.3 E OF PHILIP, Haakon, SD
Built 1955 Load: 31.6 t ADT: 725
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges
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.