Aut cum scuto aut in scuto
Actually, this is not a 'runway'. He is doing a high speed taxi between Lake Hood and Lake Spenard, Anchorage, Alaska, the largest seaplane base in the world.
as it's up on step, that's a damn fast taxi.
Nice to see a Goose with the original engines. It's plenty wide enough as long as there is no significant crosswind. Al_in_Ottawa
You need a runway like that behind Casa CW for your float plane.