US Bridges

LA Cnty RD 451 over Allison Draw

Good

Laramie County, Wyoming · Cheyenne · Structure no. MGF

Built
2009
16 years old
Condition
Good
inspected December 2023
Type
Culvert
Steel
Length
24 ft
1 main span
Daily traffic
197
2024 count
Owner
County
County Highway Agency

About this bridge

LA Cnty RD 451 over Allison Draw is a steel culvert carrying LA Cnty RD 451 over Allison Draw in Laramie County, Wyoming. It was built in 2009, so it is 16 years old, younger than the Wyoming average of 48.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 197 vehicles a day, roughly 57% of them trucks, projected to reach 276 by 2043. The structure is 24 ft (7.4 m) long.

CarriesLA Cnty RD 451
CrossesAllison Draw
LocationCheyenne
RouteCounty Highway 451
StateWyoming
Coordinates41.09709, -104.81161
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadUnknown
Structure length24 ft (7.4 m)
Longest span19 ft (5.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic197 (2024)
Projected traffic276 by 2043
Trucks57%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA Cnty RD 451 over Allison Draw built?

It was built in 2009, making it 16 years old in 2025.

What condition is LA Cnty RD 451 over Allison Draw in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.

How much traffic does LA Cnty RD 451 over Allison Draw carry?

About 197 vehicles per day (2024 count), of which roughly 57% are trucks.

How long is LA Cnty RD 451 over Allison Draw?

The structure is 24 ft (7.4 m) long with a longest span of 19 ft (5.7 m).

Who owns LA Cnty RD 451 over Allison Draw?

It is owned by the County Highway Agency.