Note: the tentative name of Lake Montgomerie was abandoned. See

Download PDF: Evidence for Holocene megafloods downs the Tsangpo River gorge, Southeastern Tibet Montgomery, D. R., Hallet, B., Yuping, L., Finnegan, N., Anders, A., and Gillespie, A., Evidence for Holocene megafloods downs the Tsang po River gorge, Southeastern Tibet, Quaternary Research, v., 62, p. 201-207. 2004.

The map and graph above show 9 profiles of Lake Montgomerie. The lake had an area of 2847 square kilometers. The mean depth was 291 meters, and the maximum depth was 690 meters. This would bump the Great Slave Lake out of sixth place in the deepest lakes of the world. The first five are Lake Baikal (1741m), Lake Tanganyika (1400m), Caspian Sea (1025m), Lake Malawi (706m), and Lake Issyk-Kul in Kyrgyzstan (702m). The deepest US lakes are Crater Lake (592m), Lake Tahoe (501m), and Lake Chelan (489m). Based on the provisional SRTM 3" DEM, the lake had a volume of 835 cubic kilometers. The profiles imply that the lake has accumulated hundreds of meters of sediment in 9000 years. On the other hand, the canyon may have been partially scoured while the lake drained.

This graph shows how the lake would have filled with various configurations of the ice dam. Terraces (below) suggesta lake at 3530 meters at 9000 years BP and a lake at 3088 meters at 1200 years BP.
DEM from the lake to the Brahmaputra mouth
same thing in a large tif file

figures for Feb 2004 paper:

More images, including ASTER