US Bridges

Malaga-Alcoa HWY over Stemilt Cr.

FairPosted for load

Chelan County, Washington · 2.7 from S. Wenatchee Av · Structure no. 082544000000000

Built
1951
74 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete Continuous
Length
44 ft
3 main spans
Daily traffic
5,578
2019 count
Owner
County
County Highway Agency

About this bridge

Malaga-Alcoa HWY over Stemilt Cr. is a concrete continuous slab carrying Malaga-Alcoa HWY over Stemilt Cr. in Chelan County, Washington. It was built in 1951, so it is 74 years old, older than the Washington average of 49.8 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. Its operating status is: posted for load restriction.

It carries about 5,578 vehicles a day, roughly 7% of them trucks, projected to reach 6,930 by 2043. The structure is 44 ft (13.4 m) long and 30 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesMalaga-Alcoa HWY
CrossesStemilt Cr.
Location2.7 from S. Wenatchee Av
RouteCounty Highway 91300
CountyChelan County
StateWashington
Coordinates47.37833, -120.24667
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25.7 US tons
Inventory rating20 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length44 ft (13.4 m)
Longest span30 ft (9.1 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,578 (2019)
Projected traffic6,930 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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$1.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Malaga-Alcoa HWY over Stemilt Cr. built?

It was built in 1951, making it 74 years old in 2025.

What condition is Malaga-Alcoa HWY over Stemilt Cr. 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 September 2023.

How much traffic does Malaga-Alcoa HWY over Stemilt Cr. carry?

About 5,578 vehicles per day (2019 count), of which roughly 7% are trucks.

How long is Malaga-Alcoa HWY over Stemilt Cr.?

The structure is 44 ft (13.4 m) long with a longest span of 30 ft (9.1 m) and a deck 30 ft wide.

Who owns Malaga-Alcoa HWY over Stemilt Cr.?

It is owned by the County Highway Agency.