US Bridges

Wyo 387 over Coal Draw

Fair

Natrona County, Wyoming · Midwest - Reno JCT · Structure no. DDA

Built
1977
48 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
450 ft
3 main spans
Daily traffic
2,173
2024 count
Owner
State
State Highway Agency

About this bridge

Wyo 387 over Coal Draw is a steel continuous stringer/multi-beam or girder carrying Wyo 387 over Coal Draw in Natrona County, Wyoming. It was built in 1977, so it is 48 years old, younger than the Wyoming average of 48.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 2,173 vehicles a day, roughly 41% of them trucks, projected to reach 3,042 by 2043. The structure is 450 ft (137.2 m) long and 39 ft wide. If it were closed, the detour would be 52.8 mi (85 km).

Location

Open in Google Maps
CarriesWyo 387
CrossesCoal Draw
LocationMidwest - Reno JCT
RouteState Highway 387
CountyNatrona County
StateWyoming
Coordinates43.44773, -106.23282
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length450 ft (137.2 m)
Longest span175 ft (53.3 m)
Deck width39 ft (11.8 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,173 (2024)
Projected traffic3,042 by 2043
Trucks41%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed52.8 mi (85 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Wyo 387 over Coal Draw built?

It was built in 1977, making it 48 years old in 2025.

What condition is Wyo 387 over Coal Draw in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2023.

How much traffic does Wyo 387 over Coal Draw carry?

About 2,173 vehicles per day (2024 count), of which roughly 41% are trucks.

How long is Wyo 387 over Coal Draw?

The structure is 450 ft (137.2 m) long with a longest span of 175 ft (53.3 m) and a deck 39 ft wide.

Who owns Wyo 387 over Coal Draw?

It is owned by the State Highway Agency.