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.

When Sheridan County's bridges were built

170 bridges with a recorded construction year, grouped by decade

bridges

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).

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

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 Poor
Park County 187 4.3%
Fremont County 177 6.2%
Crook County 176 1.7%
Sheridan County (this page) 170 4.7%
Platte County 160 8.8%
Campbell County 152 2.6%

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).

Similar average build year

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

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)

I-90/US 14/87 Bus

Good

Over: Big Goose Creek

Sheridan N Main Street, Sheridan, WY

Built 1987 Load: 39.8 t ADT: 6,416

I-90/US 14/87 Bus

Good

Over: I-90

Sheridan N Main Street, Sheridan, WY

Built 2017 Load: 40.2 t ADT: 6,514

Sh Cnty Rd 67

Good

Over: Wolf Creek

T56N R086W S11, Sheridan, WY

Built 1983 Load: 40.8 t ADT: 274

Sh Cnty Rd 67

Good

Over: Tongue River

Wolf Creek Road, Sheridan, WY

Built 1998 Load: 40.8 t ADT: 274

Sh Cnty Rd 145

Good

Over: South Piney Creek

Story, Sheridan, WY

Built 1986 Load: 42.6 t ADT: 387

S Sheridan Avenue

Good

Over: Little Goose Creek

Sheridan, Sheridan, WY

Built 2002 Load: 44.5 t ADT: 3,697

WYO 339

Good

Over: I-90

Montana Line - Sheridan, Sheridan, WY

Built 2004 Load: 46.3 t ADT: 233

I-90 EBL

Good

Over: BNSF / Higby Road

Sheridan Marginal, Sheridan, WY

Built 2018 Load: 48.3 t ADT: 3,609

I-90 WBL

Good

Over: BNSF / Higby Road

Sheridan Marginal, Sheridan, WY

Built 2017 Load: 48.3 t ADT: 3,907

Sh Cnty Rd 93

Good

Over: Tongue River

4 Mi. E. Of Ranchester, Sheridan, WY

Built 2003 Load: 49.9 t ADT: 72

FSR 26

Good

Over: SOUTH TONGUE RIVER

26.9 MI W ON FSR 26, Sheridan, WY

Built 1961 Load: 56.7 t ADT: 60

Sh Cnty Rd 1213

Good

Over: Little Goose Creek

6 Mi S Of Sheridan, Sheridan, WY

Built 2015 Load: 60.6 t ADT: 204

Sh Cnty Rd 110

Poor

Over: Tongue River

7 Mi Nw Of Sheridan, Sheridan, WY

Built 1903 Load: 5.5 t ADT: 179

Sh Cnty Rd 140

Poor

Over: BNSF Railway

Parkman, Sheridan, WY

Built 1916 Load: 10.2 t ADT: 135

N Brooks Street

Poor

Over: Little Goose Creek

Val Vista Lane St., Sheridan, WY

Built 1970 Load: 23.6 t ADT: 4,611

Sh Cnty Rd 103

Poor

Over: Little Goose Creek

T54N R084W S09, Sheridan, WY

Built 1961 Load: 27.1 t ADT: 19

E Works Street

Poor

Over: Little Goose Creek

Sheridan Streets, Sheridan, WY

Built 1970 Load: 29.0 t ADT: 408

I-90 EBL

Poor

Over: WYO 342

Sheridan - Buffalo, Sheridan, WY

Built 1968 Load: 30.8 t ADT: 3,427

I-90 WBL

Poor

Over: Machinery Pass

Montana Line - Sheridan, Sheridan, WY

Built 1983 Load: 36.3 t ADT: 2,076

W 11th Street

Poor

Over: Big Goose Creek

Sheridan Streets, Sheridan, WY

Built 1981 Load: 36.9 t ADT: 1,752

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.