impassable

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When an official was sent in the 1630s from Moscow to the north-east of Siberia to become the new military governor in Yakutsk it took him three years, sitting out cold spells of up to -50 [degree]C, or waiting for flooded rivers to subside and the impassably muddy thaws of late spring to end, before he could reach his destination.
Less than a decade ago, the colonia on the outskirts of Brownsville had impassably muddy dirt roads, no city services and few homes up to code.
It was down a lane, which quickly turned unpaved; and since the day was wet--in fact it was pouring--the lane was mud, impassably so.