US Bridges

Rd. No. 4032 over Mallardy Creek

Fair

Snohomish County, Washington · M.P. 1.0 Rd. No. 4032 · Structure no. 060502000001375

Built
1961
64 years old
Condition
Fair
inspected October 2024
Type
Frame
Concrete Continuous
Length
75 ft
3 main spans
Daily traffic
23
1980 count
Owner
Federal
U.S. Forest Service

About this bridge

Rd. No. 4032 over Mallardy Creek is a concrete continuous frame carrying Rd. No. 4032 over Mallardy Creek in Snohomish County, Washington. It was built in 1961, so it is 64 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.

It carries about 23 vehicles a day, projected to reach 34 by 2045. The structure is 75 ft (22.9 m) long and 23 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

CarriesRd. No. 4032
CrossesMallardy Creek
LocationM.P. 1.0 Rd. No. 4032
RouteFederal Lands Road 40320
Coordinates48.05295, -121.6559
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating50.2 US tons
Inventory rating34.7 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length75 ft (22.9 m)
Longest span50 ft (15.2 m)
Deck width23 ft (7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23 (1980)
Projected traffic34 by 2045
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Rd. No. 4032 over Mallardy Creek built?

It was built in 1961, making it 64 years old in 2025.

What condition is Rd. No. 4032 over Mallardy 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 October 2024.

How much traffic does Rd. No. 4032 over Mallardy Creek carry?

About 23 vehicles per day (1980 count).

How long is Rd. No. 4032 over Mallardy Creek?

The structure is 75 ft (22.9 m) long with a longest span of 50 ft (15.2 m) and a deck 23 ft wide.

Who owns Rd. No. 4032 over Mallardy Creek?

It is owned by the U.S. Forest Service.