US Bridges

Mosquito Lk RD over Hutchinson CR

Fair

Whatcom County, Washington · 4.5 NE Valley Hwy. · Structure no. 087229000000000

Built
1945
80 years old, rebuilt 2005
Condition
Fair
inspected March 2023
Type
Channel Beam
Concrete
Length
31 ft
1 main span
Daily traffic
389
2023 count
Owner
County
County Highway Agency

About this bridge

Mosquito Lk RD over Hutchinson CR is a concrete channel beam carrying Mosquito Lk RD over Hutchinson CR in Whatcom County, Washington. It was built in 1945 and reconstructed in 2005, so it is 80 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 389 vehicles a day, roughly 20% of them trucks, projected to reach 600 by 2045. The structure is 31 ft (9.4 m) long and 26 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

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CarriesMosquito Lk RD
CrossesHutchinson CR
Location4.5 NE Valley Hwy.
RouteCounty Highway 84190
CountyWhatcom County
StateWashington
Coordinates48.74175, -122.12165
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
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 inspectionMarch 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34 US tons
Inventory rating24 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length31 ft (9.4 m)
Longest span30 ft (9.1 m)
Deck width26 ft (7.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic389 (2023)
Projected traffic600 by 2045
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 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$1.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mosquito Lk RD over Hutchinson CR built?

It was built in 1945, making it 80 years old in 2025. It was reconstructed in 2005.

What condition is Mosquito Lk RD over Hutchinson CR 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 March 2023.

How much traffic does Mosquito Lk RD over Hutchinson CR carry?

About 389 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is Mosquito Lk RD over Hutchinson CR?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 26 ft wide.

Who owns Mosquito Lk RD over Hutchinson CR?

It is owned by the County Highway Agency.