County profile · official public datasets

Sheridan County, WY

170 public highway bridges tracked in the FHWA National Bridge Inventory: 23.5% rated Good, 71.8% Fair, 4.7% Poor.

170
Public bridges: 23.5%
Good condition: 4.7%
Poor condition

The verdict

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

Sheridan County posts a better-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

Top 39%
lowest Poor share in state: 4.7%
Poor-condition share: 170
public highway bridges: 1975
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.

Sheridan County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Sheridan County ranks #9 of 23 Wyoming counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.7%). Sheridan County, Wyoming contains 170 public highway bridges. Roughly 23.5% are rated “Good,” 71.8% “Fair,” and 4.7% “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

170

Public highway bridges in Sheridan County

Good condition

23.5%

40 of 170 rated 7-9

Fair condition

71.8%

122 of 170 rated 5-6

Poor condition

4.7%

8 of 170 rated 4 or below

In-state Poor-share rank

#9 of 23

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

Condition distribution

Share of 170 NBI-tracked bridges by lowest applicable component rating.

Good

23.5% (40)

Fair

71.8% (122)

Poor

4.7% (8)

Sheridan County's Poor-condition bridges carry 12,607 vehicle crossings a day

That is 3.6% of the county's reported daily bridge traffic on 4.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,576 crossings a day against 1,873 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 170 of 170 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

49.4% of Sheridan County's bridges have passed the 50-year mark

84 of the 170 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 23.5% 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 36.6% of the county's Poor-condition bridge traffic

N Brooks Street over Little Goose Creek, built 1970, carries 4,611 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 8-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 12,607 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

1
1910s

2
1920s

3
1930s

3
1940s

2
1950s

18
1960s

43
1970s

14
1980s

51
1990s

17
2000s

9
2010s

6
2020s

1

What this shows Construction peaked in the 1980s, when 51 of the county's bridges still in the inventory were built, which is 30% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1975) matches the Wyoming average (1976).

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

The 5 Wyoming counties nearest Sheridan County in number of bridges, with their condition splits. Its 4.7% Poor share is the 4th-lowest of these 6. Its average build year of 1975 against a peer-group mean of 1977 is in line with the group.

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

Bridge inventory size and condition shares for Sheridan County and the 5 Wyoming counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Park County	187	37.4%	58.3%	4.3%	1979
Fremont County	177	47.5%	46.3%	6.2%	1981
Crook County	176	30.7%	67.6%	1.7%	1974
Sheridan County (this page)	170	23.5%	71.8%	4.7%	1975
Platte County	160	31.3%	60%	8.8%	1970
Campbell County	152	25.7%	71.7%	2.6%	1980

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

Similar inventory size

Nearest county inventories outside WY (170 bridges here).

Rush County, KS · 170 bridges
Itasca County, MN · 170 bridges
Montgomery County, MS · 170 bridges
Clarendon County, SC · 170 bridges

Similar average build year

Nearest mean year-built outside WY (1975 here).

San Bernardino County, CA · avg 1975 · 1,422 bridges
Lane County, OR · avg 1975 · 1,010 bridges
Fulton County, GA · avg 1975 · 775 bridges
Westmoreland County, PA · avg 1975 · 620 bridges

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

All 170 Good 40 Fair 122 Poor 8

All bridges (170)

Sort:

I-90 WBL

Fair

Over: US 14

Montana Line - Sheridan, Sheridan, WY

Built 1982 Load: 37.2 t ADT: 3,535

Sh Cnty Rd 106

Fair

Over: Tongue River

Sheridan-Ranchester, Sheridan, WY

Built 1960 Load: 37.2 t ADT: 32

Sh Cnty Rd 87

Fair

Over: Big Goose Creek

7 Mi S.W Of Sheridan, Sheridan, WY

Built 1988 Load: 37.2 t ADT: 326

WYO 331

Fair

Over: Big Goose Creek

Sheridan - Beckton, Sheridan, WY

Built 1970 Load: 38.1 t ADT: 1,490

US 14

Fair

Over: Prairie Dog Creek

Sheridan - Ucross, Sheridan, WY

Built 1981 Load: 39.0 t ADT: 1,129

US 14

Fair

Over: Piney Creek

Sheridan - Ucross, Sheridan, WY

Built 1981 Load: 39.0 t ADT: 749

US 14

Fair

Over: Powder River

55.10 Mi East Of Sheridan, Sheridan, WY

Built 1990 Load: 39.0 t ADT: 210

US 14

Fair

Over: Boxelder Creek

Sheridan - Ucross, Sheridan, WY

Built 1981 Load: 40.5 t ADT: 749

Park Street

Fair

Over: Little Goose Creek

City Of Sheridan, Sheridan, WY

Built 1996 Load: 40.5 t ADT: 733

E 8th Street

Fair

Over: Big Goose Creek

8Th Street - Sheridan, Sheridan, WY

Built 1986 Load: 40.8 t ADT: 1,334

WYO 338

Fair

Over: Tongue River

Decker Road, Sheridan, WY

Built 1989 Load: 41.7 t ADT: 913

I-90 EBL

Fair

Over: WYO 336 (5th Street)

Sheridan Marginal, Sheridan, WY

Built 1995 Load: 41.7 t ADT: 4,669

I-90 WBL

Fair

Over: WYO 336 (5th Street)

Sheridan Marginal, Sheridan, WY

Built 1995 Load: 41.7 t ADT: 5,095

I-90/US 14/87 Bus

Fair

Over: Little Goose Creek

Sheridan N Main Street, Sheridan, WY

Built 1954 Load: 42.6 t ADT: 11,274

Lewis Street

Fair

Over: Big Goose Creek

Sheridan, Sheridan, WY

Built 2015 Load: 44.7 t ADT: 3,401

Sh Cnty Rd 255

Fair

Over: Clear Creek

1 Mile N. Of Leiter, Sheridan, WY

Built 1993 Load: 45.4 t ADT: 65

WYO 338

Fair

Over: Youngs Creek

Decker Road, Sheridan, WY

Built 1989 Load: 46.3 t ADT: 913

Sh Cnty Rd 219

Fair

Over: Clear Creek

.5 Miles S Of Clearmont, Sheridan, WY

Built 2009 Load: 46.3 t ADT: 63

US 14

Fair

Over: BNSF Railroad

East Edge of Ranchester, Sheridan, WY

Built 2022 Load: 49.2 t ADT: 767

Sh Cnty Rd 2

Fair

Over: North Piney Creek

2 Miles W. Of Storey, Sheridan, WY

Built 1914 Load: 55.3 t ADT: 31

Avoca Avenue

Fair

Over: Little Goose Creek

Sheridan Streets, Sheridan, WY

Built 2005 Load: 56.2 t ADT: 2,886

Sh Cnty Rd 74

Fair

Over: East Wolf Creek

7 Mi S Of Ranchester, Sheridan, WY

Sheridan County Bridge Snapshot

Condition distribution

Sheridan County's Poor-condition bridges carry 12,607 vehicle crossings a day

49.4% of Sheridan County's bridges have passed the 50-year mark

One structure carries 36.6% of the county's Poor-condition bridge traffic

How Sheridan 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 (170)

I-90 WBL

Sh Cnty Rd 106

Sh Cnty Rd 87

WYO 331

US 14

US 14

US 14

US 14

Park Street

E 8th Street

WYO 338

I-90 EBL

I-90 WBL

I-90/US 14/87 Bus

Lewis Street

Sh Cnty Rd 255

WYO 338

Sh Cnty Rd 219

US 14

Sh Cnty Rd 2

Avoca Avenue

Sh Cnty Rd 74

FDR 26

WYO 345

WYO 345

WYO 345

FSR 26

Sh Cnty Rd 67

I-90 EBL

I-90 WBL

WYO 331

I-90 WBL

WYO 339

FSR 15

US 14

WYO 345

US 14

US 14

US 14

US 14A

Sh Cnty Rd 1211

Sh Cnty Rd 74

Sh Cnty Rd 1211

US 14

WYO 335

I-90/US 14/87 Bus

I-90 EBL

I-90 WBL

Sh Cnty Rd 66

Sh Cnty Rd 71

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