US Bridges

Na Cnty RD 412 over Mowrey Draw

FairPosted for load

Natrona County, Wyoming · 3 MI N.E. of Alcova · Structure no. FOC

Built
1929
96 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
70 ft
1 main span
Daily traffic
165
2024 count
Owner
County
County Highway Agency

About this bridge

Na Cnty RD 412 over Mowrey Draw is a steel stringer/multi-beam or girder carrying Na Cnty RD 412 over Mowrey Draw in Natrona County, Wyoming. It was built in 1929, so it is 96 years old, older 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 165 vehicles a day, roughly 9% of them trucks, projected to reach 231 by 2043. The structure is 70 ft (21.3 m) long and 21 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesNa Cnty RD 412
CrossesMowrey Draw
Location3 MI N.E. of Alcova
RouteCounty Highway 412
CountyNatrona County
StateWyoming
Coordinates42.57023, -106.70059
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23 US tons
Inventory rating15.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1 (+2 approach)
Design loadUnknown
Structure length70 ft (21.3 m)
Longest span36 ft (10.9 m)
Deck width21 ft (6.4 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic165 (2024)
Projected traffic231 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$47,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Na Cnty RD 412 over Mowrey Draw built?

It was built in 1929, making it 96 years old in 2025.

What condition is Na Cnty RD 412 over Mowrey 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 August 2024.

How much traffic does Na Cnty RD 412 over Mowrey Draw carry?

About 165 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is Na Cnty RD 412 over Mowrey Draw?

The structure is 70 ft (21.3 m) long with a longest span of 36 ft (10.9 m) and a deck 21 ft wide.

Who owns Na Cnty RD 412 over Mowrey Draw?

It is owned by the County Highway Agency.