US Bridges

Mountain Loop HWY over Turlo Creek

Fair

Snohomish County, Washington · 10.6 MI E JCT SR 92 · Structure no. 086154000000000

Built
1995
30 years old
Condition
Fair
inspected June 2023
Type
Tee Beam
Prestressed Concrete
Length
114 ft
1 main span
Daily traffic
3,212
2022 count
Owner
County
County Highway Agency

About this bridge

Mountain Loop HWY over Turlo Creek is a prestressed concrete tee beam carrying Mountain Loop HWY over Turlo Creek in Snohomish County, Washington. It was built in 1995, so it is 30 years old, younger 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.

It carries about 3,212 vehicles a day, roughly 6% of them trucks, projected to reach 4,000 by 2045. The structure is 114 ft (34.7 m) long and 37 ft wide. If it were closed, the detour would be 93.8 mi (151 km).

Location

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CarriesMountain Loop HWY
CrossesTurlo Creek
Location10.6 MI E JCT SR 92
RouteCounty Highway 98960
CountySnohomish County
StateWashington
Coordinates48.09646, -121.7885
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating98 US tons
Inventory rating38 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length114 ft (34.7 m)
Longest span112 ft (34.1 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,212 (2022)
Projected traffic4,000 by 2045
Trucks6%
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 statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$4.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mountain Loop HWY over Turlo Creek built?

It was built in 1995, making it 30 years old in 2025.

What condition is Mountain Loop HWY over Turlo 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 June 2023.

How much traffic does Mountain Loop HWY over Turlo Creek carry?

About 3,212 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is Mountain Loop HWY over Turlo Creek?

The structure is 114 ft (34.7 m) long with a longest span of 112 ft (34.1 m) and a deck 37 ft wide.

Who owns Mountain Loop HWY over Turlo Creek?

It is owned by the County Highway Agency.