US Bridges

Lockwood RD over Swamp Creek

Fair

Snohomish County, Washington · 0.02 N King CO Lin · Structure no. 084727000000000

Built
1968
57 years old
Condition
Fair
inspected October 2023
Type
Tee Beam
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
4,651
2022 count
Owner
County
County Highway Agency

About this bridge

Lockwood RD over Swamp Creek is a prestressed concrete tee beam carrying Lockwood RD over Swamp Creek in Snohomish County, Washington. It was built in 1968, so it is 57 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 4,651 vehicles a day, roughly 5% of them trucks, projected to reach 7,500 by 2045. The structure is 40 ft (12.3 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesLockwood RD
CrossesSwamp Creek
Location0.02 N King CO Lin
RouteCounty Highway 6490
Coordinates47.77724, -122.24986
Functional classUrban 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadUnknown
Structure length40 ft (12.3 m)
Longest span39 ft (11.8 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,651 (2022)
Projected traffic7,500 by 2045
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$1.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Lockwood RD over Swamp Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is Lockwood RD over Swamp 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 2023.

How much traffic does Lockwood RD over Swamp Creek carry?

About 4,651 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Lockwood RD over Swamp Creek?

The structure is 40 ft (12.3 m) long with a longest span of 39 ft (11.8 m) and a deck 29 ft wide.

Who owns Lockwood RD over Swamp Creek?

It is owned by the County Highway Agency.