County profile · official public datasets

Laramie County, WY

254 public highway bridges tracked in the FHWA National Bridge Inventory: 24.4% rated Good, 66.5% Fair, 9.1% Poor.

Compiled by PlainBridges

254
Public bridges: 24.4%
Good condition: 9.1%
Poor condition

The verdict

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

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

17th
of 23 on Poor share: 9.1%
Poor-condition share: 254
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.

Laramie County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Laramie County ranks #17 of 23 Wyoming counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 9.1%). Laramie County, Wyoming contains 254 public highway bridges. Roughly 24.4% are rated “Good,” 66.5% “Fair,” and 9.1% “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

254

Public highway bridges in Laramie County

Good condition

24.4%

62 of 254 rated 7-9

Fair condition

66.5%

169 of 254 rated 5-6

Poor condition

9.1%

23 of 254 rated 4 or below

In-state Poor-share rank

#17 of 23

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

Condition distribution

Share of 254 NBI-tracked bridges by lowest applicable component rating.

Good

24.4% (62)

Fair

66.5% (169)

Poor

9.1% (23)

Laramie County's Poor-condition bridges carry 129,668 vehicle crossings a day

That is 10.1% of the county's reported daily bridge traffic on 9.1% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 5,638 crossings a day against 3,811 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 253 of 254 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

59.1% of Laramie County's bridges have passed the 50-year mark

150 of the 254 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 24.4% 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 10.4% of the county's Poor-condition bridge traffic

WYO 212 over Crow Creek, built 1976, carries 13,541 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 23-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 129,668 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

1
1930s

3
1940s

4
1950s

42
1960s

78
1970s

51
1980s

19
1990s

17
2000s

19
2010s

14
2020s

6

What this shows Construction peaked in the 1960s, when 78 of the county's bridges still in the inventory were built, which is 30.7% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1975) matches the Wyoming average (1976).

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

The 5 Wyoming counties nearest Laramie County in number of bridges, with their condition splits. Its 9.1% Poor share is the 6th-lowest of these 6. Its average build year of 1975 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 Laramie County and the 5 Wyoming counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Laramie County (this page)	254	24.4%	66.5%	9.1%	1975
Carbon County	206	38.8%	54.4%	6.8%	1973
Johnson County	204	26.5%	70.6%	2.9%	1970
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

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

Similar inventory size

Nearest county inventories outside WY (254 bridges here).

Manatee County, FL · 254 bridges
Ottawa County, MI · 254 bridges
Wagoner County, OK · 254 bridges
Coos County, OR · 254 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 254 Good 62 Fair 169 Poor 23

Fair-condition bridges (169)

Sort:

Laramie County Bridge Snapshot

Condition distribution

Laramie County's Poor-condition bridges carry 129,668 vehicle crossings a day

59.1% of Laramie County's bridges have passed the 50-year mark

One structure carries 10.4% of the county's Poor-condition bridge traffic

How Laramie 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

Fair-condition bridges (169)

La Cnty Rd 236-1

Ames Avenue

La Cnty Rd 143-2

I-25 Service Road

I-25 Service Road

La Cnty Rd 203-1

I-25 NBL

I-25 SBL

I-25 Service Road

I-25 Service Road

MISSILE DRIVE

WYO 211

I-80 EBL

I-80 WBL

I-80 WBL

I-80 EBL

WYO 213

I-80 EBL

I-80 WBL

I-80 Service Road

La Cnty Rd 220-1

I-80 WBL

La Cnty Rd 228-2

I-25 SBL

La Cnty Rd 120-1

I-25 NBL

I-25 SBL

WYO 211

I-80 EBL Off Ramp

I-25 NBL

I-80 EBL

I-80 WBL

I-80 EBL

I-80 WBL

La Cnty Rd 123-1

I-80 WBL On Ramp

I-25 SBL

I-80 EBL

I-80 WBL

I-80 EBL

I-80 WBL

I-25 NBL

I-25 SBL

I-25 NBL

I-25 SBL

I-80 EBL

I-80 WBL

I-80 Service Road

I-80 WBL On Ramp

I-25 NBL

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