Willis B. Horn

Snohomish River Bridge (Southbound) (Snohomish County, Washington)
Vertical Lift Engineer, 1954
Vertical lift bridge over Snohomish River on southbound WA-529
Open to traffic

US101 Chehalis River Bridge (Grays Harbor County, Washington)
Bascule Designer, 1955
Warren deck truss bascule bridge over Chehalis River on US 101 in Aberdeen
Open to traffic

WA529 Steamboat Slough Bridge (NB) (Snohomish County, Washington)
Movable Bridge Engineer, 1954
Warren swing bridge over Steamboat Slough on WA 529
Open to traffic