April 5, 1990: A lava dome – the last of a series of 14 lava domes that erupted in 1989 to 1990 – is precariously perched high on Redoubt Volcano's steep north flank. Each of the previous domes were destroyed as they collapsed down the north flank and across a glacier. The hot lava rocks carried by the pyroclastic flows melted snow and ice quickly and generated frozen mud flows that swept down Drift River valley. This dome (dark mound in center) began erupting four days earlier on April 21, and is about 328 ft. in diameter.