County profile · official public datasets

Sioux County, NE

36 public highway bridges tracked in the FHWA National Bridge Inventory: 58.3% rated Good, 38.9% Fair, 2.8% Poor.

36
Public bridges
58.3%
Good condition
2.8%
Poor condition

The verdict

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

Sioux County pairs a top-quartile lowest Poor-condition share among rated counties in the state with an older average build year than the state inventory.

Top 24%
lowest Poor share in state
2.8%
Poor-condition share
36
public highway bridges
1972
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.

Sioux County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Sioux County ranks #21 of 88 Nebraska counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.8%). Sioux County, Nebraska contains 36 public highway bridges. Roughly 58.3% are rated “Good,” 38.9% “Fair,” and 2.8% “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

36

Public highway bridges in Sioux County

Good condition

58.3%

21 of 36 rated 7-9

Fair condition

38.9%

14 of 36 rated 5-6

Poor condition

2.8%

1 of 36 rated 4 or below

In-state Poor-share rank

#21 of 88

Among Nebraska counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 36 NBI-tracked bridges by lowest applicable component rating.

Good
58.3% (21)
Fair
38.9% (14)
Poor
2.8% (1)

Sioux County's Poor-condition bridges carry 15 vehicle crossings a day

That is 0.4% of the county's reported daily bridge traffic on 2.8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 15 crossings a day against 167 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 36 of 36 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

44.4% of Sioux County's bridges have passed the 50-year mark

16 of the 36 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 58.3% 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 100% of the county's Poor-condition bridge traffic

COUNTY HIGHWAY over HAT CREEK, built 1935, carries 15 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 1-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 15 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Sioux County's bridges were built

36 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1970s, when 10 of the county's bridges still in the inventory were built, which is 27.8% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1972, 5 years older than the Nebraska average of 1977.

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Sioux County compares with Nebraska's closest counties by inventory size

The 5 Nebraska counties nearest Sioux County in number of bridges, with their condition splits. Its 2.8% Poor share is the 4th-lowest of these 6. Its average build year of 1972 against a peer-group mean of 1974 is in line with the group.

Showing the 5 closest of 87 Nebraska counties eligible for comparison.

Bridge inventory size and condition shares for Sioux County and the 5 Nebraska counties closest to it in inventory size
County Bridges Poor
Hayes County 41 14.6%
Banner County 36 0%
Sioux County (this page) 36 2.8%
Chase County 33 3%
Box Butte County 30 0%
Garden County 29 0%

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 Sioux 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 Sioux County, both outside Nebraska so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside NE (36 bridges here).

Similar average build year

Nearest mean year-built outside NE (1972 here).

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

All 36 Good 21 Fair 14 Poor 1

All bridges (36)

COUNTY HIGHWAY

Fair

Over: SAND CREEK

17E 7N OF HARRISON, Sioux, NE

Built 1970 Load: 7.0 t ADT: 15

MONTROSE ROAD

Fair

Over: HAT CREEK

7E 16N OF HARRISON, Sioux, NE

Built 2018 Load: 8.0 t ADT: 25

COUNTY HIGHWAY

Fair

Over: HAT CREEK

5.5E 5.5N OF HARRISON, Sioux, NE

Built 1935 Load: 9.0 t ADT: 20

COUNTY HIGHWAY

Fair

Over: DEAD MANS CREEK

1S FORT ROBINSON, Sioux, NE

Built 1970 Load: 11.0 t ADT: 30

COLL 7139

Fair

Over: SOWBELLY CREEK

5.5N 4E OF HARRISON, Sioux, NE

Built 1975 Load: 14.0 t ADT: 30

COUNTY HIGHWAY

Fair

Over: WEST HAT CREEK

4.5E 3N OF HARRISON, Sioux, NE

Built 1975 Load: 14.0 t ADT: 10

COLL 7139

Fair

Over: WHITEHEAD CREEK

JCT N2/SD BORDER 2W 3.7S, Sioux, NE

Built 1954 Load: 15.0 t ADT: 25

COUNTY HIGHWAY

Fair

Over: INTERSTATE CANAL

14E 4N OF HENRY, Sioux, NE

Built 1908 Load: 22.0 t ADT: 10

COLL 7133

Fair

Over: INTERSTATE CANAL

9N OF HENRY, Sioux, NE

Built 1971 Load: 24.0 t ADT: 95

COUNTY HIGHWAY

Fair

Over: INTERSTATE CANAL

4N 5E OF HENRY, Sioux, NE

Built 1978 Load: 24.0 t ADT: 15

COLL 7137

Fair

Over: INTERSTATE CANAL

2.7N 7E OF HENRY, Sioux, NE

Built 1972 Load: 24.0 t ADT: 145

SERVICE ROAD

Fair

Over: NIOBRARA RIVER

Entrance road toward visi, Sioux, NE

Built 1985 Load: 25.4 t ADT: 4

COUNTY HIGHWAY

Fair

Over: INTERSTATE CANAL

3E 6N OF HENRY, Sioux, NE

Built 1982 Load: 31.0 t ADT: 20

COUNTY HIGHWAY

Fair

Over: PID CANAL

8N 2E OF HENRY, Sioux, NE

Built 1935 Load: 44.0 t ADT: 10

COUNTY HIGHWAY

Good

Over: WEST HAT CREEK

4.5E 2N OF HARRISON, Sioux, NE

Built 1975 Load: 16.0 t ADT: 10

COLL 7137

Good

Over: NIOBRARA RIVER

12.5S 1W OF HARRISON, Sioux, NE

Built 2002 Load: 22.0 t ADT: 40

FAS 1105

Good

Over: STREAM

JCT US20/N29 .7N, Sioux, NE

Built 1935 Load: 22.0 t ADT: 150

US20

Good

Over: STREAM

ECL HARRISON, Sioux, NE

Built 1940 Load: 22.0 t ADT: 615

N29

Good

Over: STREAM

22S AGATE, Sioux, NE

Built 1963 Load: 22.0 t ADT: 240

N29

Good

Over: STREAM

7S HARRISON, Sioux, NE

Built 1952 Load: 22.0 t ADT: 265

N29

Good

Over: STREAM

4S HARRISON, Sioux, NE

Built 1952 Load: 22.0 t ADT: 265

N29

Good

Over: STREAM

1S HARRISON, Sioux, NE

Built 1952 Load: 22.0 t ADT: 265

COUNTY HIGHWAY

Good

Over: WHITEHEAD CREEK

12N 12E OF HARRISON, Sioux, NE

Built 1978 Load: 24.0 t ADT: 25

COUNTY HIGHWAY

Good

Over: WRPI 909-780-T

1E 6N .8W HENRY, Sioux, NE

Built 1984 Load: 29.0 t ADT: 20

TOADSTOOL ROAD

Good

Over: DIRTY CREEK

JCT US20/N29 18.3E 10.2N, Sioux, NE

Built 1991 Load: 31.0 t ADT: 115

COUNTY HIGHWAY

Good

Over: WRPI 909-787-R

1E 1N .4E HENRY, Sioux, NE

Built 1984 Load: 31.0 t ADT: 50

COUNTY HIGHWAY

Good

Over: STREAM

6S 14.2E OF HARRISON, Sioux, NE

Built 1999 Load: 33.0 t ADT: 20

N29

Good

Over: INTERSTATE CANAL

8N MITCHELL, Sioux, NE

Built 1973 Load: 33.0 t ADT: 240

N29

Good

Over: NIOBRARA RIVER

0N AGATE, Sioux, NE

Built 2006 Load: 33.0 t ADT: 205

N71

Good

Over: WIND SPRING DRAW

11N SCOTTSBLUFF, Sioux, NE

Built 1982 Load: 33.0 t ADT: 745

FAS 1085

Good

Over: WHITE RIVER

JCT US20/N29 17.5E 4.8S, Sioux, NE

Built 1991 Load: 35.0 t ADT: 55

SCHOOL HOUSE RD

Good

Over: NIOBRARA RIVER

18S 14E OF HARRISON, Sioux, NE

Built 2006 Load: 36.0 t ADT: 35

FAS 1085

Good

Over: DEEP CREEK

JCT US20/N29 16.5E 5.5S, Sioux, NE

Built 1987 Load: 36.0 t ADT: 55

FAS 1105

Good

Over: INDIAN CREEK

JCT US20/N29 1.3E 21.4N, Sioux, NE

Built 2003 Load: 52.0 t ADT: 50

COLL 7126

Good

Over: INTERSTATE CANAL

18E 2N OF HENRY, Sioux, NE

Built 1988 Load: 52.0 t ADT: 50

COUNTY HIGHWAY

Poor

Over: HAT CREEK

19N 10E OF HARRISON, Sioux, NE

Built 1935 Load: 6.0 t ADT: 15

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

Related

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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.