182 kb Figure 2. Debris flows in and above the Arapahoe Basin Ski area. Debris flow deposit at the base of the northern flank of Woods Mountain. See geologist for scale. 53 kb Figure 4.
Debris flow tracks on the southern flank of Mount Parnassus.
This debris flow deposited an estimated 100,000 cubic meters of debris, up to about 7 m deep and with boulders up to 2 m in diameter, on and near I-70, closing the interstate for about 24 hours. Particular attention was given to the Watrous Gulch debris flow because of its size and location above I-70. These 6 channels are best described as large rills, or erosional gullies. There were no discrete, large landslides at the heads of any of the channels. 153 kb Figure 5.