California Department of Transportation

Quick Map

Materials Lab



Laboratory Policies and Procedures




CalTrans Humboldt County Field Laboratories

humco labs

Caltrans District 01 Main Laboratory

1726 Albee st.

Eureka, Ca. 95501



Caltrans Field Laboratories

Arcata R.E. Office / Lab

5065 Boyd Rd. Suite “G”

Arcata, Ca 95518


Fortuna Lab

180 Dinsmore Dr.

Fortuna, Ca. 95540


Cooks Valley Lab

Mercer Frasier HMA Plant

Hwy 101 & MEN. CO. RTE. 442E

240 Cooks Valley Rd. /Shared with Mercer Fraser


Willow Creek Maintenance Yard Lab

Hwy 96 PM 0.60

Willow Creek, Ca. 95573


Caltrans Accredited Private Laboratories

SHN Engineers & Geologists Inc.

812 W. Wabash

Eureka, Ca. 95501


Laco and Associates

21 West 4th Street

Eureka, Ca. 95501