US Bridges

Hidden Valley RD over Purdy Creek

Fair

Snohomish County, Washington · 6.8 SE JCT SR 92 · Structure no. 080879000000000

Built
1980
45 years old, rebuilt 1993
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
85 ft
4 main spans
Daily traffic
100
2021 count
Owner
County
County Highway Agency

About this bridge

Hidden Valley RD over Purdy Creek is a wood or timber stringer/multi-beam or girder carrying Hidden Valley RD over Purdy Creek in Snohomish County, Washington. It was built in 1980 and reconstructed in 1993, so it is 45 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 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 100 vehicles a day, roughly 17% of them trucks, projected to reach 200 by 2044. The structure is 85 ft (25.9 m) long and 25 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesHidden Valley RD
CrossesPurdy Creek
Location6.8 SE JCT SR 92
RouteCounty Highway 48460
CountySnohomish County
StateWashington
Coordinates48.0138, -121.9119
Functional classRural Local

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.
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 inspectionAugust 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans4
Design loadHS 20
Structure length85 ft (25.9 m)
Longest span23 ft (7.1 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2021)
Projected traffic200 by 2044
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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$3.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Hidden Valley RD over Purdy Creek built?

It was built in 1980, making it 45 years old in 2025. It was reconstructed in 1993.

What condition is Hidden Valley RD over Purdy 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 August 2023.

How much traffic does Hidden Valley RD over Purdy Creek carry?

About 100 vehicles per day (2021 count), of which roughly 17% are trucks.

How long is Hidden Valley RD over Purdy Creek?

The structure is 85 ft (25.9 m) long with a longest span of 23 ft (7.1 m) and a deck 25 ft wide.

Who owns Hidden Valley RD over Purdy Creek?

It is owned by the County Highway Agency.