County profile · official public datasets

Crook County, WY

176 public highway bridges tracked in the FHWA National Bridge Inventory: 30.7% rated Good, 67.6% Fair, 1.7% Poor.

176
Public bridges: 30.7%
Good condition: 1.7%
Poor condition

The verdict

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

Crook County posts a top-10% lowest Poor-condition share among rated counties in the state across mid-size county bridge inventory.

Top 9%
lowest Poor share in state: 1.7%
Poor-condition share: 176
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.

Crook County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Crook County ranks #2 of 23 Wyoming counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 1.7%). Crook County, Wyoming contains 176 public highway bridges. Roughly 30.7% are rated “Good,” 67.6% “Fair,” and 1.7% “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

176

Public highway bridges in Crook County

Good condition

30.7%

54 of 176 rated 7-9

Fair condition

67.6%

119 of 176 rated 5-6

Poor condition

1.7%

3 of 176 rated 4 or below

In-state Poor-share rank

#2 of 23

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

Condition distribution

Share of 176 NBI-tracked bridges by lowest applicable component rating.

Good

30.7% (54)

Fair

67.6% (119)

Poor

1.7% (3)

Crook County's Poor-condition bridges carry 193 vehicle crossings a day

That is 0.1% of the county's reported daily bridge traffic on 1.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 64 crossings a day against 1,189 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 176 of 176 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

59.7% of Crook County's bridges have passed the 50-year mark

105 of the 176 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 30.7% 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 67.9% of the county's Poor-condition bridge traffic

Cr Cnty Rd 129 over I-90, built 1977, carries 131 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 3-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 193 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1940s

4
1950s

15
1960s

76
1970s

35
1980s

12
1990s

15
2000s

7
2010s

10
2020s

2

What this shows Construction peaked in the 1960s, when 76 of the county's bridges still in the inventory were built, which is 43.2% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1974) matches the Wyoming average (1976).

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

The 5 Wyoming counties nearest Crook County in number of bridges, with their condition splits. Its 1.7% Poor share is the 1st-lowest of these 6. Its average build year of 1974 against a peer-group mean of 1976 is in line with the group.

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

Bridge inventory size and condition shares for Crook County and the 5 Wyoming counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Sweetwater County	191	28.8%	62.8%	8.4%	1976
Park County	187	37.4%	58.3%	4.3%	1979
Fremont County	177	47.5%	46.3%	6.2%	1981
Crook County (this page)	176	30.7%	67.6%	1.7%	1974
Sheridan County	170	23.5%	71.8%	4.7%	1975
Platte County	160	31.3%	60%	8.8%	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 Crook 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 Crook County, both outside Wyoming so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside WY (176 bridges here).

Des Moines County, IA · 176 bridges
Perry County, KY · 176 bridges
Winston County, MS · 176 bridges
Paulding County, OH · 176 bridges

Similar average build year

Nearest mean year-built outside WY (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 176 Good 54 Fair 119 Poor 3

All bridges (176)

Sort:

I-90 WBL

Fair

Over: Wind Creek

Moorcroft - Sundance, Crook, WY

Built 1962 Load: 36.3 t ADT: 1,928

Cr Cnty Rd 93

Fair

Over: I-90

Moorcroft - Sundance, Crook, WY

Built 1962 Load: 39.0 t ADT: 40

I-90 EBL

Fair

Over: CR 93 (Old Sundance Rd)

Moorcroft - Sundance, Crook, WY

Built 1959 Load: 39.9 t ADT: 2,134

I-90 WBL

Fair

Over: CR 93 (Old Sundance Rd)

Moorcroft - Sundance, Crook, WY

Built 1959 Load: 39.9 t ADT: 1,900

I-90 EBL

Fair

Over: Machinery Pass

Sundance - S Dakota Line, Crook, WY

Built 1977 Load: 39.9 t ADT: 2,665

I-90 WBL

Fair

Over: Machinery Pass

Sundance - S Dakota Line, Crook, WY

Built 1977 Load: 39.9 t ADT: 2,674

I-90 EBL

Fair

Over: Machinery Pass

Sundance - S Dakota Line, Crook, WY

Built 1977 Load: 39.9 t ADT: 2,665

I-90 WBL

Fair

Over: Machinery Pass

Sundance - S Dakota Line, Crook, WY

Built 1977 Load: 39.9 t ADT: 2,674

Cr Cnty Rd 200

Fair

Over: Little Missouri River

18 Miles North Of Oshoto, Crook, WY

Built 2000 Load: 40.8 t ADT: 14

I-90 EBL

Fair

Over: US 14

Sundance Marginal, Crook, WY

Built 1969 Load: 42.6 t ADT: 2,385

I-90 WBL

Fair

Over: US 14

Sundance Marginal, Crook, WY

Built 1969 Load: 42.6 t ADT: 2,416

WYO 51

Fair

Over: Belle Fourche River

Gillette-Moorecroft, Crook, WY

Built 1994 Load: 45.4 t ADT: 1,323

Cr Cnty Rd 32

Fair

Over: Little Missouri River

19 Mi N.W. Of Hulett, Crook, WY

Built 1991 Load: 45.7 t ADT: 24

Cr Cnty Rd 106

Fair

Over: Arch Creek

16 Mi N.E. Of Moorcroft, Crook, WY

Built 1991 Load: 50.8 t ADT: 61

Warren Peak Road

Fair

Over: Beaver Creek

4 Miles East Of Alva, Crook, WY

Built 1990 Load: 52.9 t ADT: 26

Cr Cnty Rd 180

Fair

Over: Arch Creek

7 Mi. N.E. Of Pine Haven, Crook, WY

Built 1992 Load: 54.4 t ADT: 126

Fawn Creek Road

Fair

Over: Beaver Creek

17 Mi. N. Of Sundance, Crook, WY

Built 2000 Load: 60.8 t ADT: 61

Cr Cnty Rd 268

Fair

Over: Inyan Kara Creek

16 Mi West Of Sundance, Crook, WY

Built 1991 Load: 61.7 t ADT: 74

ENTRANCE ROAD

Fair

Over: BELLE FOURCHE RIVER

26.6 MILES NORTHEAST OF I, Crook, WY

Crook County Bridge Snapshot

Condition distribution

Crook County's Poor-condition bridges carry 193 vehicle crossings a day

59.7% of Crook County's bridges have passed the 50-year mark

One structure carries 67.9% of the county's Poor-condition bridge traffic

How Crook 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 (176)

I-90 WBL

Cr Cnty Rd 93

I-90 EBL

I-90 WBL

I-90 EBL

I-90 WBL

I-90 EBL

I-90 WBL

Cr Cnty Rd 200

I-90 EBL

I-90 WBL

WYO 51

Cr Cnty Rd 32

Cr Cnty Rd 106

Warren Peak Road

Cr Cnty Rd 180

Fawn Creek Road

Cr Cnty Rd 268

ENTRANCE ROAD

Cr Cnty Rd 24

I-90 WBL

I-90 WBL

I-90 Service Road

I-90 WBL

I-90 EBL

I-90 WBL

I-90 EBL

I-90 WBL

WYO 111

I-90 Service Road

WYO 111

FDR 843

I-90 WBL

I-90 EBL

I-90 EBL

I-90 WBL

I-90 EBL

I-90 WBL

I-90 EBL

I-90 WBL

I-90 EBL

I-90 EBL

Cr Cnty Rd 129

Cr Cnty Rd 129

Cr Cnty Rd 129

Cr Cnty Rd 129

Cr Cnty Rd 129

Cr Cnty Rd 129

US 14

WYO 585

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