In Marble Canyon I counted 63, and in the distance from the Little Colorado to the mouth of the Kanab, 131.

We counted about 600 from Green River Valley to the Kanab Canyon, and Stanton's party counted 520 large rapids from Fremont River to the Grand Wash, or about 600 from the Junction.
From Green River Valley to the foot of Black Canyon something over 1000 would be a near estimate of the total number of rapids.

The velocity is always tremendous.

The width of the river varies according to the locality.

Green River is from 250 to 400 feet in the canyons, and 800 to 1000 in the valleys.