Trihydro Corporation Share: Energy & Environment Trihydro Corporation Visit Website 1830 E Century Ave, Ste #8 Bismarck, ND 58503 (307) 745-7474 About Rep Info Map About Trihydro is a privately held, full service engineering consulting firm established in 1984 with corporate headquarters in Laramie, Wyoming. Trihydro employs over 350 employees nationwide in 15 offices Whom to Contact Amy Blyth Lisa Dvorak What's Nearby? Distance: 5 10 15 20 25 50 mi.