State + NAICS + PSC page

NAICS 238990 and PSC Z1KF contractors in Washington

All Other Specialty Trade Contractors. MAINTENANCE OF DREDGING FACILITIES. Use this deeper state cross-code page to see which visible contractors sit in the overlap between these two lanes inside Washington.

Washington · NAICS 238990 · PSC Z1KF

Last updated: April 7, 2026

Visible recipients

Mapped obligations

$476,678,765

Buyer overlap

Top recipients

Visible recipients in the Washington overlap of NAICS 238990 and PSC Z1KF

Manson Construction CO

Seattle, WA

Manson Construction CO is a federal category business profile based in Seattle, WA. The current public data layer shows $223,706,344 in visible federal obligations across 86 awards or transactions. Department of Defense appears as the strongest visible awarding agency. Top industry concentration is in NAICS 237990 (Other Heavy and Civil Engineering Construction). The profile also shows meaningful product and service activity in PSC Y1KF.

$476,678,765