US Bridges

25th Ave West over Powder Mill Gulch

Fair

Snohomish County, Washington · South of 56th · Structure no. 086225000000000

Built
1993
32 years old
Condition
Fair
inspected November 2024
Type
Culvert
Steel
Length
39 ft
1 main span
Daily traffic
15
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

25th Ave West over Powder Mill Gulch is a steel culvert carrying 25th Ave West over Powder Mill Gulch in Snohomish County, Washington. It was built in 1993, so it is 32 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 15 vehicles a day, roughly 5% of them trucks, projected to reach 500 by 2044. The structure is 39 ft (11.9 m) long. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
Carries25th Ave West
CrossesPowder Mill Gulch
LocationSouth of 56th
RouteCity Street 420
CountySnohomish County
StateWashington
Coordinates47.94694, -122.26639
Functional classUrban 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour evaluation has not been made
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadUnknown
Structure length39 ft (11.9 m)
Longest span39 ft (11.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2020)
Projected traffic500 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 25th Ave West over Powder Mill Gulch built?

It was built in 1993, making it 32 years old in 2025.

What condition is 25th Ave West over Powder Mill Gulch 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 November 2024.

How much traffic does 25th Ave West over Powder Mill Gulch carry?

About 15 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is 25th Ave West over Powder Mill Gulch?

The structure is 39 ft (11.9 m) long with a longest span of 39 ft (11.9 m).

Who owns 25th Ave West over Powder Mill Gulch?

It is owned by the City or Municipal Highway Agency.