US Bridges

Mosquito Lk RD over Johnson CR

Good

Whatcom County, Washington · 4.6 NE Valley HWY · Structure no. 087231000000000

Built
2004
21 years old
Condition
Good
inspected March 2023
Type
Culvert
Steel
Length
24 ft
1 main span
Daily traffic
337
2019 count
Owner
County
County Highway Agency

About this bridge

Mosquito Lk RD over Johnson CR is a steel culvert carrying Mosquito Lk RD over Johnson CR in Whatcom County, Washington. It was built in 2004, so it is 21 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 337 vehicles a day, roughly 14% of them trucks, projected to reach 600 by 2041. The structure is 24 ft (7.3 m) long and 20 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
CarriesMosquito Lk RD
CrossesJohnson CR
Location4.6 NE Valley HWY
RouteCounty Highway 84190
CountyWhatcom County
StateWashington
Coordinates48.74419, -122.1242
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span24 ft (7.3 m)
Deck width20 ft (6.1 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic337 (2019)
Projected traffic600 by 2041
Trucks14%
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 statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mosquito Lk RD over Johnson CR built?

It was built in 2004, making it 21 years old in 2025.

What condition is Mosquito Lk RD over Johnson CR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2023.

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

About 337 vehicles per day (2019 count), of which roughly 14% are trucks.

How long is Mosquito Lk RD over Johnson CR?

The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m) and a deck 20 ft wide.

Who owns Mosquito Lk RD over Johnson CR?

It is owned by the County Highway Agency.