County profile · official public datasets

Big Horn County, WY

91 public highway bridges tracked in the FHWA National Bridge Inventory: 25.3% rated Good, 67% Fair, 7.7% Poor.

91
Public bridges: 25.3%
Good condition: 7.7%
Poor condition

The verdict

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

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

14th
of 23 on Poor share: 7.7%
Poor-condition share: 91
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.

Big Horn County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Big Horn County ranks #14 of 23 Wyoming counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 7.7%). Big Horn County, Wyoming contains 91 public highway bridges. Roughly 25.3% are rated “Good,” 67% “Fair,” and 7.7% “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.

Total bridges

Public highway bridges in Big Horn County

Good condition

25.3%

23 of 91 rated 7-9

Fair condition

67%

61 of 91 rated 5-6

Poor condition

7.7%

7 of 91 rated 4 or below

In-state Poor-share rank

#14 of 23

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

Condition distribution

Share of 91 NBI-tracked bridges by lowest applicable component rating.

Good

25.3% (23)

Fair

67% (61)

Poor

7.7% (7)

Big Horn County's Poor-condition bridges carry 2,112 vehicle crossings a day

That is 2.6% of the county's reported daily bridge traffic on 7.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 302 crossings a day against 920 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 91 of 91 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

54.9% of Big Horn County's bridges have passed the 50-year mark

50 of the 91 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 25.3% 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 73.7% of the county's Poor-condition bridge traffic

US 14A over Sand Draw, built 1975, carries 1,557 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 7-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 2,112 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

2
1930s

1
1940s

5
1950s

19
1960s

14
1970s

16
1980s

15
1990s

9
2000s

7
2010s

3

What this shows Construction peaked in the 1950s, when 19 of the county's bridges still in the inventory were built, which is 20.9% of those with a recorded year. That cohort is now 65 to 74 years old in the 2024 inventory. Its average build year (1972) matches the Wyoming average (1976).

How Big Horn County compares with Wyoming's closest counties by inventory size

The 5 Wyoming counties nearest Big Horn County in number of bridges, with their condition splits. Its 7.7% Poor share is the 3rd-lowest of these 6. Its average build year of 1972 against a peer-group mean of 1979 is 7 years older.

Showing the 5 closest of 22 Wyoming counties eligible for comparison.

Bridge inventory size and condition shares for Big Horn County and the 5 Wyoming counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Albany County	124	33.1%	65.3%	1.6%	1976
Teton County	119	31.9%	55.5%	12.6%	1978
Sublette County	109	40.4%	50.5%	9.2%	1986
Goshen County	106	19.8%	76.4%	3.8%	1974
Big Horn County (this page)	91	25.3%	67%	7.7%	1972
Washakie County	61	41%	49.2%	9.8%	1979

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 Big Horn 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 Big Horn County, both outside Wyoming so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside WY (91 bridges here).

Baxter County, AR · 91 bridges
Breckinridge County, KY · 91 bridges
Reynolds County, MO · 91 bridges
Dawes County, NE · 91 bridges

Similar average build year

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

Santa Clara County, CA · avg 1972 · 964 bridges
Madison County, AL · avg 1972 · 710 bridges
Kern County, CA · avg 1972 · 668 bridges
York County, PA · avg 1972 · 569 bridges

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

All 91 Good 23 Fair 61 Poor 7

All bridges (91)

Sort:

Big Horn County Bridge Snapshot

Condition distribution

Big Horn County's Poor-condition bridges carry 2,112 vehicle crossings a day

54.9% of Big Horn County's bridges have passed the 50-year mark

One structure carries 73.7% of the county's Poor-condition bridge traffic

How Big Horn County compares with Wyoming's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

All bridges (91)

Bh Cnty Rd 229

FDR 349

WYO 32

Bh Cnty Rd R52

WYO 30

WYO 31

WYO 31

WYO 32

Bh Cnty Rd L42C

WYO 32

WYO 32

WYO 31

Bh Cnty Rd R43H

WYO 31

WYO 31

US 310

US 16

WYO 35

US 16

Bh Cnty Rd R16D

US 16

US 310

US 14A

Bh Cnty Rd R4

Bh Cnty Rd 268

US 14

Bh Cnty Rd 268

Bh Cnty Rd 5

US 16

US 16

US 16

US 14

WYO 32

WYO 32

Bh Cnty Rd R43

Bh Cnty Rd 229

BAD PASS ROAD

US 310

Bh Cnty Rd 3

Bh Cnty Rd R49

Bh Cnty Rd 199

US 16

Bh Cnty Rd R5D

US 14

WYO 37

US 14A

WYO 32

Bh Cnty Rd R9B

US 14

US 14A

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