US Bridges

Mountain Loop Hwy. over Deer Creek

Fair

Snohomish County, Washington · 23.3 E JCT SR 92 · Structure no. 082283000000000

Built
1949
76 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
188 ft
6 main spans
Daily traffic
1,621
2019 count
Owner
County
County Highway Agency

About this bridge

Mountain Loop Hwy. over Deer Creek is a wood or timber stringer/multi-beam or girder carrying Mountain Loop Hwy. over Deer Creek in Snohomish County, Washington. It was built in 1949, so it is 76 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 5 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 1,621 vehicles a day, roughly 5% of them trucks, projected to reach 2,000 by 2045. The structure is 188 ft (57.3 m) long and 31 ft wide. If it were closed, the detour would be 93.8 mi (151 km).

Location

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CarriesMountain Loop Hwy.
CrossesDeer Creek
Location23.3 E JCT SR 92
RouteCounty Highway 98960
CountySnohomish County
StateWashington
Coordinates48.0844, -121.55453
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans6
Design loadHS 15
Structure length188 ft (57.3 m)
Longest span30 ft (9.2 m)
Deck width31 ft (9.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,621 (2019)
Projected traffic2,000 by 2045
Trucks5%
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$7.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mountain Loop Hwy. over Deer Creek built?

It was built in 1949, making it 76 years old in 2025.

What condition is Mountain Loop Hwy. over Deer 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 2023.

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

About 1,621 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is Mountain Loop Hwy. over Deer Creek?

The structure is 188 ft (57.3 m) long with a longest span of 30 ft (9.2 m) and a deck 31 ft wide.

Who owns Mountain Loop Hwy. over Deer Creek?

It is owned by the County Highway Agency.