US Bridges

Mieras Road over Roza Canal

GoodPosted for load

Yakima County, Washington · 00.16 W White Road · Structure no. 084060000000000

Built
1936
89 years old, rebuilt 1965
Condition
Good
inspected January 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
39 ft
1 main span
Daily traffic
1,370
2023 count
Owner
County
County Highway Agency

About this bridge

Mieras Road over Roza Canal is a steel stringer/multi-beam or girder carrying Mieras Road over Roza Canal in Yakima County, Washington. It was built in 1936 and reconstructed in 1965, so it is 89 years old, older than the Washington average of 49.8 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. Its operating status is: posted for load restriction.

It carries about 1,370 vehicles a day, roughly 5% of them trucks, projected to reach 1,760 by 2043. The structure is 39 ft (11.9 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesMieras Road
CrossesRoza Canal
Location00.16 W White Road
RouteCounty Highway 40300
CountyYakima County
StateWashington
Coordinates46.57703, -120.38063
Functional classRural Minor Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
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 rating15.3 US tons
Inventory rating11.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length39 ft (11.9 m)
Longest span38 ft (11.6 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,370 (2023)
Projected traffic1,760 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mieras Road over Roza Canal built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1965.

What condition is Mieras Road over Roza Canal 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 January 2023.

How much traffic does Mieras Road over Roza Canal carry?

About 1,370 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Mieras Road over Roza Canal?

The structure is 39 ft (11.9 m) long with a longest span of 38 ft (11.6 m) and a deck 30 ft wide.

Who owns Mieras Road over Roza Canal?

It is owned by the County Highway Agency.