Total bridges
72
Public highway bridges in Deuel County
County profile · official public datasets
Deuel County, SD
72 public highway bridges tracked in the FHWA National Bridge Inventory: 22.2% rated Good, 61.1% Fair, 16.7% Poor.
- 72
- Public bridges
- 22.2%
- Good condition
- 16.7%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Deuel County posts a higher-than-median Poor-condition share among rated counties in the state across rated county bridge inventory.
- 40th
- of 66 on Poor share
- 16.7%
- Poor-condition share
- 72
- public highway bridges
- 1971
- 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.
Deuel County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Deuel County ranks #40 of 66 South Dakota counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 16.7%). Deuel County, South Dakota contains 72 public highway bridges. Roughly 22.2% are rated “Good,” 61.1% “Fair,” and 16.7% “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
22.2%
16 of 72 rated 7-9
Fair condition
61.1%
44 of 72 rated 5-6
Poor condition
16.7%
12 of 72 rated 4 or below
In-state Poor-share rank
#40 of 66
Among South Dakota counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 72 NBI-tracked bridges by lowest applicable component rating.
Good 22.2% (16)
Fair 61.1% (44)
Poor 16.7% (12)
Deuel County's Poor-condition bridges carry 2,464 vehicle crossings a day
That is 2.7% of the county's reported daily bridge traffic on 16.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 205 crossings a day against 236 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 72 of 72 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
70.8% of Deuel County's bridges have passed the 50-year mark
51 of the 72 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 22.2% 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 69.9% of the county's Poor-condition bridge traffic
SD022 over CK, built 1959, carries 1,723 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 12-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 2,464 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Deuel County's bridges were built
72 bridges with a recorded construction year, grouped by decade
- 1900s 1
1900–1909
1 bridges
- 1930s 3
1930–1939
3 bridges
- 1940s 7
1940–1949
7 bridges
- 1950s
1950–1959
18 bridges
- 1960s 5
1960–1969
5 bridges
- 1970s
1970–1979
18 bridges
- 1980s 2
1980–1989
2 bridges
- 1990s 4
1990–1999
4 bridges
- 2000s 6
2000–2009
6 bridges
- 2010s 2
2010–2019
2 bridges
- 2020s 6
2020–2029
6 bridges
What this shows Construction peaked in the 1950s, when 18 of the county's bridges still in the inventory were built, which is 25% of those with a recorded year. That cohort is now 65 to 74 years old in the 2024 inventory. Its average build year (1971) matches the South Dakota average (1975).
How Deuel County compares with South Dakota's closest counties by inventory size
The 5 South Dakota counties nearest Deuel County in number of bridges, with their condition splits. Its 16.7% Poor share is the 5th-lowest of these 6. Its average build year of 1971 against a peer-group mean of 1976 is 5 years older.
Showing the 5 closest of 65 South Dakota counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Fall River County | 80 | 50% | 42.5% | 7.5% | 1982 |
| Lake County | 79 | 44.3% | 49.4% | 6.3% | 1977 |
| Codington County | 74 | 20.3% | 63.5% | 16.2% | 1976 |
| Deuel County (this page) | 72 | 22.2% | 61.1% | 16.7% | 1971 |
| Haakon County | 69 | 29% | 58% | 13% | 1974 |
| Miner County | 64 | 35.9% | 37.5% | 26.6% | 1970 |
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 Deuel 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 Deuel County, both outside South Dakota so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside SD (72 bridges here).
- Lafayette County, AR · 72 bridges
- Tattnall County, GA · 72 bridges
- Wilkinson County, GA · 72 bridges
- Kearny County, KS · 72 bridges
Similar average build year
Nearest mean year-built outside SD (1971 here).
- Wayne County, MI · avg 1971 · 1,026 bridges
- Baltimore County, MD · avg 1971 · 783 bridges
- Washington County, PA · avg 1971 · 655 bridges
- Linn County, OR · avg 1971 · 566 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (72)
TWNSHP RD 170TH ST
GoodOver: CK
2.0N 3.9E TUNERVILLE, Deuel, SD
Built 2020 Load: 36.3 t ADT: 25
TWNSHP RD 486TH AV
GoodOver: Cobb Creek
3.3 S & 1 W GARY, Deuel, SD
Built 2023 Load: 40.8 t ADT: 134
472A AVENUE
GoodOver: CK
5.5W & 9.1N TORONTO, Deuel, SD
Built 2020 Load: 41.7 t ADT: 19
CO RD 310 488TH AV
GoodOver: MONIGHAN CK
1.9N GARY, Deuel, SD
Built 2000 Load: 41.7 t ADT: 20
188 STREET
GoodOver: COBB CK
2.6E BRANDT, Deuel, SD
Built 2017 Load: 48.1 t ADT: 260
TWNSHP RD 186TH ST
GoodOver: Hidewood Creek
2.2 W & 2 N BRANDT, Deuel, SD
Built 2022 Load: 57.2 t ADT: 35
187TH STREET
GoodOver: CK
10.7 W & 7 N TORONTO, Deuel, SD
Built 2002 Load: 58.1 t ADT: 15
188 ST
GoodOver: CK
7.4W BRANDT, Deuel, SD
Built 2004 Load: 58.1 t ADT: 325
US212
GoodOver: CAIN CK
1.1 W JCT SD 15 N, Deuel, SD
Built 2019 Load: 64.2 t ADT: 2,115
467 AVENUE
GoodOver: PEG MUNKY RUN
11 W & 1.5 S TORONTO, Deuel, SD
Built 2003 Load: 68.9 t ADT: 40
PARLE ST (GARY)
PoorOver: W Br Lac qui Parle River
PARLE ST. GARY, Deuel, SD
Built 1950 Load: 2.7 t ADT: 50
TWNSHP RD 187TH ST
PoorOver: COBB CK
2.3 E & 1 N BRANDT, Deuel, SD
Built 1908 Load: 3.6 t ADT: 25
TWNSHP RD 480 AV
PoorOver: Mud Creek
4E & 5.4N TUNERVILLE, Deuel, SD
Built 1950 Load: 10.9 t ADT: 25
TWNSHP RD 186TH ST
PoorOver: COBB CK
4S & 5.1E CLEAR LAKE, Deuel, SD
Built 1950 Load: 11.0 t ADT: 45
2ND AVE (GARY)
PoorOver: W Br Lac qui Parle River
SECOND AVE. GARY, Deuel, SD
Built 1930 Load: 11.8 t ADT: 50
TWNSHP RD 483RD AV
PoorOver: CK
7E & 5.6N TUNERVILLE, Deuel, SD
Built 1930 Load: 16.3 t ADT: 25
TWNSHP RD 484TH AV
PoorOver: COBB CK
3.4 S 3.0 W GARY, Deuel, SD
Built 1945 Load: 18.0 t ADT: 10
TWNSHP RD 184TH ST
PoorOver: COBB CK
5 S & 4.7 W GARY, Deuel, SD
Built 1960 Load: 24.0 t ADT: 15
472 AVENUE
PoorOver: CK
6.2S & 4W CLEAR LAKE, Deuel, SD
Built 1950 Load: 24.5 t ADT: 25
188 STREET
PoorOver: CK
1.9W BRANDT, Deuel, SD
Built 1930 Load: 24.5 t ADT: 381
188 STREET
PoorOver: HIDEWOOD CK
6N & 1.8E ESTELLINE, Deuel, SD
Built 1978 Load: 29.0 t ADT: 90
SD022
PoorOver: CK
5.3 E I 29 INTERCH, Deuel, SD
Built 1959 Load: 50.9 t ADT: 1,723
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.