US Bridges

Mountain Loop Hwy. over Perry Creek

FairPosted for load

Snohomish County, Washington · 26.2 E JCT SR 92 · Structure no. 083057000000000

Built
1958
67 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
61 ft
2 main spans
Daily traffic
1,273
2022 count
Owner
County
County Highway Agency

About this bridge

Mountain Loop Hwy. over Perry Creek is a concrete stringer/multi-beam or girder carrying Mountain Loop Hwy. over Perry Creek in Snohomish County, Washington. It was built in 1958, so it is 67 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 1,273 vehicles a day, roughly 3% of them trucks, projected to reach 1,200 by 2046. The structure is 61 ft (18.5 m) long and 30 ft wide. If it were closed, the detour would be 93.8 mi (151 km).

Location

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CarriesMountain Loop Hwy.
CrossesPerry Creek
Location26.2 E JCT SR 92
RouteCounty Highway 98960
CountySnohomish County
StateWashington
Coordinates48.06506, -121.50779
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27 US tons
Inventory rating16 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length61 ft (18.5 m)
Longest span29 ft (8.9 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,273 (2022)
Projected traffic1,200 by 2046
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed93.8 mi (151 km)
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mountain Loop Hwy. over Perry Creek built?

It was built in 1958, making it 67 years old in 2025.

What condition is Mountain Loop Hwy. over Perry Creek 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 July 2024.

How much traffic does Mountain Loop Hwy. over Perry Creek carry?

About 1,273 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Mountain Loop Hwy. over Perry Creek?

The structure is 61 ft (18.5 m) long with a longest span of 29 ft (8.9 m) and a deck 30 ft wide.

Who owns Mountain Loop Hwy. over Perry Creek?

It is owned by the County Highway Agency.